Variable pulley device

The present invention prevents the lubricant from leaking to the outside and dust from the outside in the moving parts of the fixed pulley half body and the movable pulley half body of the variable pulley, and has durability and the number of parts. It relates to a variable pulley device which has been reduced and the structure has been made extremely simple.

Conventionally, the cam mechanism is activated by a change in the rotation speed of a power source such as an engine during normal forward running, and the belt drive diameter wound around the pulley is appropriately and steplessly changed to shift gears. There is a speed change pulley device. In this continuously variable transmission, a transmission pulley consisting of a fixed pulley half body and a movable pulley half body that can move forward and backward with respect to the fixed pulley half body is provided on the drive shaft and the driven shaft, respectively, and is provided on the drive shaft and the driven shaft. A continuously variable V-belt is hung between the transmission pulleys, and the drive shaft and the movable pulley half body on the driven shaft are moved and adjusted so that the rotation of the drive shaft and the rotation of the driven shaft are continuously changed and transmitted to the driven shaft. There is a continuously variable transmission. In such a transmission, during its operation, the movable pulley half body is constantly moved back and forth with respect to the fixed pulley half body to adjust both intervals, so that the movable pulley half body is always smooth and nimble continuously variable transmission. It is desirable to always and effectively supply lubricating oil or grease to the lubricated portion of the movable pulley half body.<patcit num="1"><text>Jitsukosho 61-605</text></patcit>

<p> As disclosed in Patent Document 1 (Jitsukosho 61-605) as a conventional technique, a fixed side pulley shaft integrated with a fixed pulley half body is rotatably supported on the outer periphery of the rotating shaft, and the fixed side is supported. The movable pulley shaft, which is integrally formed with the movable pulley half body, is slidable in the axial direction on the pulley shaft.</p><p> Oil seals are provided at both ends of the movable pulley shaft in the axial direction, and the sealing surface is in sliding contact with the outer peripheral surface of the fixed pulley shaft. Further, an oil passage groove having a concave cross section is formed on the inner peripheral surface of the movable side pulley shaft, and a lubricating oil reservoir is formed by the oil passage groove and the outer peripheral surface of the fixed side pulley shaft, and the oil passage groove is formed. The bottom surface is located radially outward from the sealing surface of the oil seal. As a result, the centrifugal force generated by the rotation of the movable pulley shaft is used to store the lubricating oil in the lubricating oil reservoir, and excess lubricating oil is supplied to the oil seal, resulting in improved sealing performance of the lubricating oil. , Fixed and movable side pulleys Leakage from the shaft can be effectively prevented.</p><p> In Patent Document 1 described above, oil seals (fixing) at both ends of the movable pulley shaft prevent leakage of lubricating oil (gris) between the fixed pulley shaft and the movable pulley shaft and between the movable pulley shaft and the outer cylinder. It is prevented by O-rings (between the movable pulley shaft and the outer cylinder) at both ends of the outer circumference of the movable pulley shaft (between the side pulley shaft and the movable pulley shaft). However, if the oil seal and O-ring deteriorate over time and their sealing performance deteriorates, the question of the fixed side pulley shaft and the movable side pulley shaft and the lubricating oil (grease) between the movable side pulley shaft and the outer cylinder If the amount of grease leaks and becomes less than the required amount, the space between the fixed side pulley shaft and the movable side pulley shaft may be worn or stuck, and the movable pulley half body may not be able to move smoothly. A technical subject (object) of the present invention is to prevent leakage of lubricant to the outside and invasion of dust from the outside in the movable portion of the fixed pulley half body and the movable pulley half body of the variable pulley in the variable pulley device. At the same time, it is to have durability, reduce the number of parts, and make the structure extremely simple.</p>

<p> Therefore, as a result of diligent research to solve the above problems, the inventor has provided the present invention with a fixed pulley face at the axial end of the fixed pulley shaft having a guide pin mounted on the outer peripheral surface. The movable side of the pulley shaft, which has a fixed pulley half body and a guide slot through which the guide pin is loosely inserted, and a circumferential recess is formed on the inner peripheral surface of the shaft end. It is composed of a movable pulley half body provided with a pulley face, an outer cylinder covering the outer peripheral surface of the movable pulley shaft, and an oil seal. The oil seal is housed in the circumferential recess and the outer cylinder is stored. The above problem is solved by providing a variable pulley device in which a bent portion covering the outer surface portion of the oil seal is formed.</p><p> Further, in the above-described configuration, the inner peripheral edge of the bent portion may be a variable pulley device that is close to the outer peripheral side surface of the fixed boss portion, or the bent portion may be a variable material different from the outer cylinder. By using a pulley device, the above problems have been solved. Further, in the above-described configuration, the above-mentioned problems are solved by providing a variable pulley device in which an O-ring is mounted between the outer cylinder and the movable pulley shaft.</p>

<p> According to the invention of claim 1, the sealing property can be improved and the leakage of the lubricating oil can be prevented. According to the invention of claim 2, the oil seal to the variable pulley device can be mounted in a stable state. According to the invention of claim 3, it is possible to significantly reduce the intrusion of dust into the attached oil seal. According to the invention of claim 4, leakage of lubricating oil (grease) can be prevented more reliably.</p>

Hereinafter, the present invention will be described with reference to the drawings. FIG. 1 shows the driven pulley mechanism in the present invention. As shown in FIGS. 1 (A) and 1 (B), the driven pulley A is a fixed pulley half body A.₁And movable pulley half body A₂It is composed of and. Its fixed pulley half body A₁As shown in FIGS. 2 and 3A, a hollow fixed-side pulley shaft 1 and a flat conical fixed-side pulley face 3 are formed. A guide pin 2 is mounted at a predetermined position on the outer peripheral side surface of the fixed side pulley shaft 1.

The guide pin 2 is formed in a cylindrical shape and is press-fitted into a predetermined position of the fixed-side pulley shaft 1. Movable pulley half body A₂Is composed of a hollow movable side pulley shaft 5, a guide elongated hole 6, and a flat conical movable side pulley face 7, as shown in FIGS. 2 and 3 (B). A circumferential recess 5a is formed along the inner peripheral surface side of the end surface of the axial end of the movable side pulley shaft 5. The circumferential recess 5a has a substantially rectangular cross section orthogonal to the circumferential direction, and the oil seal 12 is inserted and fixed.

Its fixed pulley half body A₁As shown in FIG. 1 (A), the fixed-side pulley shaft 1 of the above is rotatably supported by a driven shaft 10 provided between the fixed-side pulley shaft 1 and the centrifugal clutch B. This fixed pulley half body A via a bearing 11 such as a needle bearing and a ball bearing₁The movable pulley half body A on the outer circumference of the fixed side pulley shaft 1₂The movable side pulley shaft 5 is slidably mounted. And fixed pulley half body A₁And movable pulley half body A₂The fixed side pulley face 3 and the movable side pulley face 7 face each other, and the endless V-belt 23 is hung.

Its fixed pulley half body A₁And movable pulley half body A₂The driven pulley A is paired with a drive side pulley (not shown). As shown in FIG. 1, the guide pin 2 mounted on the fixed side pulley shaft 1 is inserted into the guide elongated hole 6. As shown in FIG. 1 (B), the guide pin 2 is equipped with a rotatable guide roller 2a, and the movable pulley shaft 5 is guided by the engagement of the guide elongated hole 6 and the guide pin 2. Therefore, the fixed-side pulley shaft 1 and the movable-side pulley shaft 5 do not rotate with each other in the circumferential direction, and can slide with each other along the axial direction. An outer cylinder 9 is mounted on the outer circumference of the movable pulley shaft 5.

The outer cylinder 9 is composed of a cylindrical portion 9a and a flange-shaped portion 9b. The movable pulley half body A is attached to the cylindrical portion 9a.₂The movable side pulley shaft 5 is inserted, and the inner diameter of the cylindrical portion 9a is such that the movable side pulley shaft 5 can smoothly enter. By covering the outer periphery of the movable pulley shaft 5 with a cylindrical portion 9a, the guide elongated hole 6 constitutes a gap portion whose circumference is substantially closed. This gap is the lubricating oil storage chamber S.₁Therefore, the lubricant such as grease filled in the guide elongated hole 6 can be stored so as not to leak to the outside.

As shown in FIGS. 3 (B), 4 and 5 and the like, a circumferential recess 5a is formed at the axial end of the movable pulley shaft 5, and the peripheral recess 5a is formed as described above. The oil seal 12 is inserted and attached to. In this case, the oil seal 12 is attached to the peripheral recess 5a in a press-fitted state, but it may be in a clearance-fitted state. The oil seal 12 has the fixed pulley half body A whose sealing surface is the fixed pulley half body A.₁It is in sliding contact with the outer peripheral surface of the fixed side pulley shaft 1.

Further, a lubricating oil storage chamber S1 having a concave cross section is formed in the axially intermediate portion of the movable side pulley shaft 5, and the lubricating oil storage chamber S1 is provided through a communication hole 1a formed in the fixed side pulley shaft 1. Lubricating oil storage chamber S, which is a gap formed between the fixed side pulley shaft 1 and the driven shaft 10.₂Is communicated with. The flange-shaped portion 9b is a portion used as a spring seat for receiving the elastic force from the coil spring 14 described later. The brim-shaped portion 9b is the movable pulley half body A.₂The elastic force of the coil spring 14 is transmitted by abutting on the back surface side (the side opposite to the surface in contact with the V-belt) of the movable side pulley face 7.

At the axial end of the outer cylinder 9, the bent portion 9d is formed so as to cover the outer surface of the oil seal by being bent toward the inner diameter center side of the cylindrical portion 9a. The bent portion 9d is formed so as to be bent at a substantially right angle toward the center side in the radial direction on the edge side of the cylindrical portion 9a [see FIG. 1 (B)]. This bent portion 9d is formed in a disk shape, and the movable pulley half body A is located at the center thereof.₂The movable side pulley shaft 5 of the above will be inserted. It is preferable that the inner peripheral side edge of the bent portion 9d is in a state of being extremely close to the outer circumference of the movable side pulley shaft 5, and the close state is such that it does not come into contact with the fixed side pulley shaft 1. To do. The bent portion 9d [see FIG. 1 (B)] serves to cover the outer side surface of the oil seal 12, and the bent portion 9d serves as a barrier (weir) for the oil seal 12. As shown in 5, it is possible to prevent the intrusion of dust from the outside and maintain stable durability as a product.

Further, since the bent portion 9d of the outer cylinder 9 is bent at the axial end portion of the cylindrical portion 9a, it becomes a reinforcement for improving the mechanical strength of the outer cylinder 9 as a whole, and the outer cylinder 9 itself. Increases the strength of. Therefore, the conventional outer cylinder that is not bent is weak in strength and easily distorted, but the outer cylinder 9 in the present invention is prevented from being deformed after molding due to the bent portion in the diameter direction, and the shape is changed. It becomes easy to maintain and the processing man-hours can be reduced. An oil seal is also attached to the boss portion 7a of the movable pulley face 7, and this oil seal is formed with a storage portion recessed in the axial direction in the boss portion 7a, and the oil seal is stored and mounted in this storage portion. [See Fig. 1 (A)].

Lubricating oil storage chamber S₂The lubricating oil (grease) inside is supplied to bearings 11 such as needle bearings and ball bearings, and is subjected to centrifugal force due to the rotation of the driven pulley and passes through the communication hole 1a to the lubricating oil storage chamber S.₁Pumped to the lubricating oil storage chamber S₁The lubricating oil stored inside is sent to the engagement point between the guide pin 2 and the guide slot 6 between the fixed side pulley shaft 1 and the movable side pulley shaft 5, and lubricated to lubricate the movable pulley half body A.₂Can always be moved smoothly.

As shown in FIG. 1A, a dry friction centrifugal clutch B is arranged adjacent to the driven pulley A. The drive plate 20 constituting this centrifugal clutch B is fixed to the left end of the fixed side pulley shaft 1 of the driven pulley A, and the fixed pulley half body A is fixed by the endless V belt 23.₁The rotational force transmitted to the drive plate 20 is transmitted to the drive plate 20 through the fixed side pulley shaft 1. Then, it is transmitted to the driven shaft 10 via the centrifugal weight 21 and the clutch outer 22.

The movable pulley half body A₂A coil spring 14 is arranged between the back surface side of the movable side pulley face 7 and the drive plate 20. The coil spring 14 is arranged on the outer peripheral side of the outer cylinder 9, one end side of the coil spring 14 in the longitudinal direction abuts on the drive plate 20, and the other end side of the coil spring 14 in the longitudinal direction is on the flange portion 9b of the outer cylinder 9. The movable side pulley face 7 is fixed to the movable side pulley face 7 through the flange-shaped portion 9b in contact with the pulley half body A.₁It is elastically biased so as to approach the fixed side pulley face 3 of the above [see FIGS. 1 (A) and 1 (B)].

A drive pulley (not shown) is provided in front of the centrifugal clutch B of the continuously variable transmission, and the drive side pulley is also composed of a fixed pulley half body and a movable pulley half body like the driven pulley A. Then, an endless V-belt 23 is hung between the drive pulley and the driven pulley, and the movable pulley half body on the drive side moves in the axial direction by centrifugal force according to the engine speed, so that the belt is fixed on the drive side. The radius of the endless V-belt 23 in the area wound around the side pulley face and the movable pulley face changes, and the radius of the area around the endless V-belt 23 in the driven pulley A also changes accordingly. .. As a result, the number of revolutions of the engine output shaft is automatically and steplessly changed and transmitted to the driven pulley A.

Next, the bent portion 9d of the outer cylinder 9 may be a separate member [see FIG. 6 (A)]. This is a connecting cylindrical portion 9d that polymerizes on the bent portion 9d on the outer circumference of the cylindrical portion 9a.₁Is formed, and the connecting cylindrical portion 9d₁Is bonded to the shaft end of the cylindrical portion 9a in a polymerized state. Cylindrical part for this connection 9d₁Can be joined and fixed to the cylindrical part 9a via a fixing means such as welding, or the connecting cylindrical part 9d₁May be fixed to the cylindrical portion 9a in a press-fitted state [see FIGS. 6 (B) and 6 (C)]. In this way, by making the bent portion 9d an outer cylinder 9 or an independent separate member, the bent portion 9d can be attached to the member corresponding to the outer cylinder 9 in the present invention in the conventional type variable pulley device. Therefore, the configuration as in the present invention can be obtained.

In the present invention, the O-ring 13 is used in combination with the oil seal 12. The movable pulley half body A₂A groove 5b on which the O-ring 13 is mounted is formed on the movable side pulley shaft 5. Then, the space between the inner peripheral surface of the cylindrical portion 9a of the outer cylinder 9 and the fixed-side pulley shaft 1 is sealed by the O-ring 13. By using the O-ring 13 together with the oil seal 12, the lubricating oil does not leak between the oil seal 12 and the movable pulley shaft 5, and the O-ring 13 connects the movable pulley shaft 5 and the outer cylinder 9. Leakage of lubricating oil between them can be reliably prevented. The O-ring 13 is not always necessary when the movable pulley shaft 5 and the outer cylinder 9 maintain a sufficient close contact with each other.

In the present invention, since the bent portion 9d is formed so that the axial end portion of the outer cylinder 9 covers the side surface of the outer end end of the oil seal 12, the bent portion 9d serves as a barrier (weir). Therefore, the intrusion of dust from the outside can be prevented by the end portion, and the stable durability of the product can be maintained. Further, since the bent portion 9d of the outer cylinder 9 eliminates the leakage of the lubricating oil to the outside, the lubricating oil does not scatter to the centrifugal clutch.

Therefore, since the lubricating oil does not adhere to the frictional engaging portion of the clutch weight of the centrifugal clutch, the performance is stable and the reliability and durability of the product itself are improved. In addition, the bent portion 9d can prevent dust from entering from the outside, and since dust does not adhere to the lip portion 12a of the oil seal 12, deterioration of the lip itself is less likely to be promoted, and a stable seal is provided. You can keep your sex.

Further, the bent portion 9d can prevent the product from being separated from the movable pulley shaft 5, and can improve the reliability of the product itself. Further, the bent portion 9d reinforces the outer cylinder 9, and the strength of the outer cylinder 9 itself can be increased. Further, since the bent portion 9d of the outer cylinder 9 can be formed by bending, the manufacturing is easy and the manufacturing cost can be kept low.

<figref num="1">(A) is a vertical sectional side view showing the configuration in the first embodiment of the present invention, and (B) is an enlarged sectional view of a main part of (A).</figref><figref num="2">It is an exploded sectional view of the main constituent member in 1st Embodiment of this invention.</figref><figref num="3">(A) is a perspective view of the main part of the fixed side pulley shaft of the fixed pulley half body, (B) is a perspective view of the movable side pulley shaft of the movable pulley half body, and (C) is a perspective view of the outer cylinder partially cut off. is there.</figref><figref num="4">It is an enlarged sectional view of the process of forming a bent portion.</figref><figref num="5">It is a working figure which removes the dust by a bent part.</figref><figref num="6">(A) is an enlarged view showing a second embodiment of the present invention, (B) is an enlarged sectional view of a main part of (A), and (C) is a further enlarged sectional view of (B).</figref>

Code description

A ... driven pulley, A₁... fixed pulley half body, A₂... movable pulley half body, 1 ... fixed side pulley shaft, 1a ... communication hole, 2 ... guide pin, 3 ... fixed side pulley face, 5 ... movable side pulley shaft, 5a ... Circumferential recess, 6 ... Guide slot, 7 ... Movable side pulley face, 9 ... Outer cylinder, 9c ... Stepped part, 9d ... Bent part, 9d₁... Cylindrical part for connection, 12 ... Oil seal, 12a ... Lip part.