JPH0714251U - Belt type continuously variable transmission - Google Patents

Abstract

(57) [Summary] [Purpose] Lubricate the belt efficiently with a small oil pump. [Structure] The belt type continuously variable transmission 1 according to the present invention includes fixed flanges 13 and 51 and movable flanges 15 and 53, respectively.
The speed change pulleys 3, 5 connected by the belt 7 mounted in the V-grooves 21, 59 between them, the spring 73 for pressing the movable flange 53 to apply tension to the belt 7, and the movable flange against the belt tension. The gear shift operation means 43 for moving the gear 15 to adjust the gear ratio, and the nozzles 83 and 85 for fixing the oil of the oil pump 75 on the stationary side to the fixed flange 1.
The oil supply means 105 for injecting to the belt 7 is provided substantially in parallel with the V groove surfaces 95, 97 of 3, 51.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a belt type continuously variable transmission.

[0002]

[Prior art]

 Japanese Unexamined Patent Publication No. 2-150549 discloses a "lubricating device for continuously variable transmission" as shown in FIG. 4, and Japanese Utility Model Laid-Open No. 4-95155 discloses a "lubricating device for continuously variable transmission" as shown in FIG. Have been described. All of these are devices that inject oil into the belt of a belt type continuously variable transmission to lubricate and cool it.

In the belt type continuously variable transmission 201 of FIG. 4, both ends of the lubricating oil pipe 203 are supported by the cases 205 and 207, and the nozzle 211 provided in the pipe 203 extends from the nozzle 211 to the belt 213 as indicated by an arrow 209. On the other hand, oil is injected in the radial direction.

In the belt type continuously variable transmission 215 of FIG. 5, the rotating member 219 having the nozzle 217 formed therein is attached to the lubricating oil pipe 221 so as to be rotatable and immovable in the axial direction. A convex portion of the moving member 225 is engaged with the twisted groove 223, and another convex portion 227 of the moving member 225 is engaged with a circumferential groove 233 provided on the movable flange 231 of the speed change pulley 229. . Therefore, the rotating member 219 is rotated by the axial movement of the moving member 225 in accordance with the shift, and the oil is ejected radially from the nozzle 217 to the belt 235.

[0005]

[Problems to be solved by the device]

 However, as shown in FIG. 4, for example, the belt 213 moves along the V-groove surface 239 of the fixed flange 237 as the gear shifts, and accordingly, both ends of the belt 213 move between the broken lines 241 and 243. Move in the direction. In each of the conventional examples shown in FIGS. 4 and 5, the nozzles 2 11 and 217 are fixed in the axial direction and inject the oil in the radial direction. Therefore, in order to sufficiently lubricate the belts 213 and 235, the oil is applied to the belt. It is necessary to inject over a range wider than the width (for example, between the broken lines 241 and 243).

Since the oil hardly spreads in a short-distance injection, a large number of nozzles must be arranged. If the number of nozzles is increased, it is necessary to increase the capacity of the oil pump, and the belts 213 and 235 are large. When moving, the jetted oil from the nozzle on the opposite side comes off the belts 213 and 235 and is wasted. Further, in the conventional example of FIG. 5, the oil pressure is applied to the sliding portion between the lubricating oil pipe 221 and the rotating member 219, so that sealing is difficult.

Therefore, an object of the present invention is to provide a belt type continuously variable transmission in which lubrication and cooling of a belt can be efficiently performed by a small oil pump and the oil system can be easily sealed.

[0008]

[Means for Solving the Problems]

 The belt type continuously variable transmission of the present invention comprises a pair of speed change pulleys, which are connected via a belt mounted in a V groove between a fixed flange and a movable flange, and change a gear ratio according to a change in flange spacing, and a movable flange. The spring to apply tension to the belt and the movable flange of one of the speed change pulleys to move the fixed flange side against the belt tension to adjust the gear ratio and the oil from the oil pump. It is characterized in that it is provided with an oil supply means for spraying from the nozzle fixed to the stationary side to the belt substantially parallel to the V groove surface of the fixing flange.

[0009]

[Action]

 Since the oil is jetted to the belt almost parallel to the V-groove surface of the fixed flange, the jet oil does not move to the nozzle even if the belt moves in the axial direction due to the speed change. No oil is wasted. Therefore, unlike the conventional example, the number of nozzles can be reduced to reduce the capacity of the oil pump, or the nozzles can be arranged at narrower intervals to enhance the lubrication effect of the belt. Further, unlike the conventional example of FIG. 5, there is no sliding part in the oil system, so that sealing is easy.

[0010]

【Example】

 One embodiment will be described with reference to FIGS. 1 to 3. FIG. 1 shows a belt type continuously variable transmission 1 of the embodiment. Hereinafter, the left and right directions are the left and right directions in FIGS. 1 and 3, and members and the like without reference numerals are not shown.

This belt type continuously variable transmission 1 is arranged between an engine of a vehicle and an auxiliary machine, and is provided with a pair of speed change pulleys 3, 5 and a belt 7 connecting them as shown in FIG. It is stored in the casing 9.

The input-side speed change pulley 3 includes a fixed flange 13 that is integral with the drive shaft 11 and a movable flange 15. A hub 17 is spline-connected to the outer periphery of the drive shaft 11, and the movable flange 15 is connected by a torque cam 19 formed between the drive flange 11 and the drive shaft 11 so as to be movable in the axial direction while relatively rotating with respect to the drive shaft 11. There is. The belt 7 is attached to the V groove 21 formed between the flanges 13 and 15. The drive shaft 11 is supported on the casing 9 by bearings 23 and 25.

The driving force of the engine is accelerated through the speed increasing gear set 27 to rotate the drive shaft. The speed increasing gear set 27 is composed of large and small gears 29 and 31 meshing with each other, and the large gear 29 is supported by a shaft 33 whose both ends are supported by the casing 9 via bearings 35 and 35, The gear 31 is fixed to the drive shaft 11. A seal 37 is arranged between the drive shaft 11 and the casing 9.

A partition wall 41, in which an O-ring 39 is arranged between the hub 17 and the movable flange 15, is integrally formed, and a hydraulic chamber 43 (shift operation means) is provided between the partition wall 41 and the movable flange 15. Are formed. Hydraulic pressure is supplied to the hydraulic chamber 43 through an oil passage 45 formed through the casing 9 and the drive shaft 11 and an oil plug 47, and moves the movable flange 15 to the fixed flange 13 side.

The output-side speed change pulley 5 includes a fixed flange 51 that is integral with the driven shaft 49, and a movable flange 53. A hub 55 is spline-connected to the outer periphery of the driven shaft 49, and the movable flange 53 is connected to the driven shaft 49 by a torque cam 57 formed between the movable flange 53 and the driven shaft 49 so as to be movable in the axial direction while relatively rotating. There is. The belt 7 is attached to the V groove 59 formed between the flanges 51 and 53.

The driven shaft 49 is supported by the casing 9 via bearings 61 and 63, and a pulley 65 is fixed to the left end portion that penetrates the casing 9. The pulley 65 is connected to a pulley on the accessory side via a belt mounted in each groove 67, 69. A seal 71 is arranged between the driven shaft 49 and the casing 9.

A disc spring 73 (spring) is arranged between the movable flange 53 of the speed change pulley 5 and the hub 55, and presses the movable flange 53 toward the fixed flange 51 to apply tension to the belt 7.

When the hydraulic pressure is not supplied to the hydraulic chamber 43, as shown in FIG. 2, the pulley pitch diameter R ₂ of the speed change pulley 5 is maximized by the urging force of the disc spring 73, and the pulley pitch diameter R ₂ of the speed change pulley 3 is increased. ₁ becomes the minimum due to the belt tension, and the speed increasing ratio between the pulleys 3 and 5 becomes the minimum. When hydraulic pressure is applied to the hydraulic chamber 43, the movable flanges 15 and 53 are moved against the disc spring 73, the pulley pitch diameter R ₁ is increased and R ₂ is decreased, and the speed increasing ratio is increased. This speed increasing ratio is controlled according to the fluctuation of the engine speed and the required output of auxiliary machinery.

An oil pump 75 that rotates in conjunction with the drive shaft 11 is arranged on the left side of the speed change pulley 3, and oil is discharged from an oil line 78 through an oil passage 77 formed in the casing 9 and the driven shaft 49. Then, the sliding portion of the movable flange 53 and the torque cam 57 are slid. The torque cams 19 and 57 press the movable flanges 15 and 53 toward the fixed flanges 13 and 51 when the belt tension suddenly increases due to torque transmission, increase the frictional force, and prevent the belt 7 from slipping.

An oil pipe 79 and an oil plug 81 for sending the oil in the oil line 78 to the oil pipe 79 are fixed to the casing 9. As shown in FIG. 2, the oil pipe 79 is arranged inside the belt 7 at a position where it does not interfere with the belt 7 which moves with a shift, and the oil pipe 79 has two nozzles 83, 83 as shown in FIG. 85 are formed. These nozzles 83, 85 direct the oil toward the belt 7 in parallel with the V-groove surfaces 95, 97 of the fixed flanges 13, 51 as shown by the alternate long and short dash lines 87, 89 in FIG. To jet. Further, the belt 7 rotates in the direction of arrow 99 in FIG. 2, and the oil of the nozzles 83 and 85 is sprayed in the direction of the alternate long and short dash lines 101 and 103, that is, toward the meshing start point of the belt 7 and the pulleys 3 and 5. As a result, the meshing start point where the load on the belt 7 is the highest is effectively lubricated and cooled. The nozzles 83 and 85, the oil pipe 79, the oil pump 75, and the like constitute an oil supply means 105.

Further, since the directions of the alternate long and short dash lines 101 and 103 follow the rotation of the belt 7, the injection speed of the oil to the belt 7 is reduced, the oil scattering due to the collision with the belt 7 is suppressed low, and the nozzle Since 83 and 85 are inside the belt 7, the oil is prevented from being ejected to the outside, so that the utilization efficiency of oil is high and the effect of lubricating and cooling the belt 7 is high.

In addition to this, as shown in FIG. 3 (the shift pulley 5 is shown as an example), the injection oils 91 and 93 from the nozzles 83 and 85 are fixed flanges 51 as indicated by the direction lines 107 and 109. Is parallel to the V-shaped groove surface 97 and is jetted in the moving direction to the belt 7 moving along the V-shaped groove surface 97. Therefore, the injection oil 91, 93 is generated at any stage of gear shifting from the state where the movable flange 53 is at the position of the arrow 111 to the maximum speed increasing ratio to the state where the movable flange 53 is at the position of the arrow 113 to the minimum speed increasing ratio. There is no waste of oil because it does not come off the belt 7. Therefore, unlike the conventional example, it is not necessary to widely dispose a large number of nozzles, and the capacity of the oil pump 79 can be reduced and downsized.

Further, unlike the conventional example of FIG. 5, the oil system for belt lubrication has no sliding portion, so that the sealing is easy.

[0024]

[Effect of device]

 The belt type continuously variable transmission of the present invention is configured such that the nozzle for injecting lubricating oil to the belt is fixed to the stationary side and the oil is injected almost in parallel with the moving direction of the belt which moves in accordance with the shift. Therefore, the injected oil does not come off the belt at all stages of gear shifting. Therefore, the effect of lubricating and cooling the belt is high, the number of nozzles is reduced, and the capacity of the oil pump can be reduced. Also, since there is no sliding part in the lubricating oil system, sealing is easy.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a schematic partial cross-sectional view showing an oil supply unit.

FIG. 4 is a sectional view of a conventional example.

FIG. 5 is a cross-sectional view of another conventional example.

[Explanation of symbols]

 1 Belt Type Continuously Variable Transmission 3,5 Variable Speed Pulley 13,51 Fixed Flange 15,53 Movable Flange 21,59 V Groove 43 Hydraulic Chamber (Shift Operation Means) 73 Disc Spring (Spring) 75 Oil Pump 83,85 Nozzle 95, 97 V-groove surface 105 Oil supply means

Claims (1)

[Scope of utility model registration request] 1. A pair of speed change pulleys connected via a belt mounted in a V groove between a fixed flange and a movable flange to change a gear ratio by a change in flange spacing, and a movable flange pressed to a fixed flange side to form a belt. A spring that gives tension, a shift operation means that adjusts the gear ratio by moving the movable flange of one shift pulley to the fixed flange side against the belt tension, and a nozzle that fixes the oil of the oil pump to the stationary side. And an oil supply means for injecting oil to the belt substantially parallel to the V groove surface of the fixed flange.