JPH08363U - Belt type continuously variable transmission - Google Patents

Abstract

(57) [Abstract] [Purpose] An object of the present invention is to provide a belt type continuously variable transmission that suppresses vibration of a disc spring that gives tension to a belt and prevents abnormal wear of a transmission pulley and a belt. [Structure] The belt type continuously variable transmission (1) of the present invention comprises a fixed flange (27, 37) and a movable flange (29, 3).
9) Belt pitch diameters (R ₁ , R ₁
The pair of speed change pulleys (5, 7) for changing the speed ratio of the transmitted power by the change of R ₂ ) and the movable flange (39) of the speed change pulley (7) are pushed toward the fixed flange (37) side and the belt (61). Belleville spring (63) that gives tension to the
Vibration damping means (65, 67) for damping the vibration of 3)
And a gear shift operation means (79) for adjusting the gear ratio by pressing the movable flange (29) of the gear shift pulley (5) against the fixed flange (27) against the belt tension.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

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

[0002]

[Prior art]

 A publicly available Japanese Utility Model Publication No. 2-85062 discloses a speed change pulley 201 as shown in FIG. This is a speed change pulley for a belt type continuously variable transmission, and is connected to another speed change pulley via a belt 209 mounted in a V groove 207 formed between a fixed flange 203 and a movable flange 205. The tension is applied to the belt 209 by the disc spring 211 that presses the movable flange 205 toward the fixed flange 203. When a gear shifting operation for changing the flange spacing on the other gear shifting pulley side is performed, the flange spacing of the gear shifting pulley 201 changes due to the belt tension, the belt pitch diameter of each gear shifting pulley changes, and the gear ratio changes.

[0003]

[Problems to be solved by the device]

 However, the torque fluctuation due to the speed change operation or the torque fluctuation due to the fluctuation of the input or the load vibrates the movable flange 205 in the axial direction by the wedge action of the V groove 207 to which the belt tension is applied. Further, the movable flange 205 is pushed back at the contact portion by the belt 209 to swing and rotate. Such movement of the movable flange is transmitted to the disc spring 211, which vibrates the disc spring 211 at a relatively high frequency, and this vibration vibrates the movable flange 205 to make contact with the belt 209 indicated by an arrow 213. Wear out as shown by the broken line.

Therefore, an object of the present invention is to provide a belt type continuously variable transmission that suppresses vibration of a disc spring that gives tension to a belt to prevent abnormal wear of a speed change pulley and a belt.

[0005]

[Means for Solving the Problems]

 The belt type continuously variable transmission according to the present invention includes a pair of speed change pulleys that are connected to each other through a belt mounted between a fixed flange and a movable flange and that change a speed ratio of transmitted power by a change in belt pitch diameter according to a change in flange spacing. , A disc spring that presses the movable flange of the speed change pulley toward the fixed flange to give tension to the belt, a vibration damping means that reduces the vibration of the disc spring, and a fixed flange that resists the belt tension to the movable flange of the speed change pulley. And a gear shift operation means for pressing the gear to the side to adjust the gear ratio.

[0006]

[Action]

 The vibration damping means absorbs the vibration of the disc spring due to the torque fluctuation and the swinging rotation of the movable flange. Therefore, abnormal wear between the movable flange and the belt due to the vibration of the disc spring is prevented, and the life of the speed change pulley and the belt is improved.

[0007]

【Example】

 One embodiment will be described with reference to FIGS. 1 and 2. FIG. 1 shows a belt type continuously variable transmission of this embodiment. Hereinafter, the left and right directions refer to the left and right directions in FIGS. 1 and 2. In addition, members and the like without reference numerals are not shown.

The belt type continuously variable transmission 1 is arranged between the engine of the vehicle and the auxiliary machine, and is composed of a speed increasing gear set 3, an engine side speed change pulley 5, an auxiliary machine side speed change pulley 7, and the like. And is housed in a casing 9 in which lubricating oil is enclosed.

The speed increasing gear set 3 is composed of large and small gears 11.13 meshing with each other, and the large gear 11 is supported by a shaft 15 whose both ends are supported by a casing 9 via bearings 17, 17. The small gear 13 is fixed to a drive shaft 19, and the drive shaft 19 is supported by the casing 9 via bearings 21 and 23. The large gear 11 meshes with the output gear on the engine side, and the driving force of the engine is increased by the speed increasing gear set 3 to rotate the drive shaft 19. A seal 25 is arranged between the pinion 13 and the casing 9.

The speed change pulley 5 includes a fixed flange 27 and a movable flange 29 that are integral with the drive shaft 19, and the movable flange 29 is formed between a torque cam 33 and a hub 31 that is spline-connected to the outer periphery of the drive shaft 19. Is connected to the drive shaft 19 so as to be movable in the axial direction while rotating with respect to the drive shaft 19.

The speed change pulley 7 includes a fixed flange 37 that is integral with the driven shaft 35 and a movable flange 39. The movable flange 39 is formed between a torque cam 43 formed between the movable flange 39 and a hub 41 that is splined to the outer periphery of the driven shaft 35. Is connected to the driven shaft 35 so as to be movable in the axial direction while rotating. The driven shaft 35 is supported by the casing 9 via bearings 45 and 47, and a pulley 49 is fixed to the left end portion that penetrates the casing 9. The pulley 49 is connected to the oil pump side pulley and the alternator side pulley by belts mounted in the grooves 51 and 53. A seal 55 is arranged between the pulley 49 and the casing 9 to prevent oil from leaking to the outside. The speed change pulleys 5 and 7 are connected to each other via belts 61 mounted in V grooves 57 and 59 formed between the flanges.

Eight disc springs 63 are arranged between the movable flange 39 of the transmission pulley 7 and the hub 41. Further, as shown in an enlarged manner in FIG. 2, rubber dampers 65 and 67 (vibration damping means) are arranged between the disc springs 63 and between the leftmost disc spring 63 and the movable flange 39, respectively. Has been done. An initial load is applied to the disc spring 63 and the dampers 65 and 67 by tightening the nut 69 of the driven shaft 35 to apply tension to the belt 61. The spring constant of each of the dampers 65 and 67 is sufficiently lower than that of the disc spring 63 to effectively absorb and damp the vibration of the disc spring 63.

On the side of the speed change pulley 7, lubricating oil is sent from an oil pump via an oil passage 71 formed through the casing 9, the driven shaft 35 and the movable flange 39 and an oil plug 73, and the inner periphery of the movable flange 39 is closed. Lubricate the sliding portion, the torque cam 43, the inner peripheral portion of the disc spring 63, and the like.

The torque cams 33 and 43 press the movable flanges 29 and 39 toward the fixed flanges 27 and 37 to increase the frictional force and prevent the belt 61 from slipping when the belt tension suddenly increases due to torque fluctuations. To work.

The hub 31 of the speed change pulley 5 is integrally formed with a partition wall 77 in which an O-ring 75 is arranged between the hub 31 and the movable flange 29. Between the partition wall 77 and the movable flange 29, a hydraulic chamber is formed. 79 (shift operation means) is formed. Hydraulic pressure is supplied to the hydraulic chamber 79 from an oil pump through an oil passage 81 formed through the casing 9, the drive shaft 19 and the movable flange 29 and an oil plug 83, and the movable flange 29 is pressed toward the fixed flange 27 side. To do.

When the hydraulic pressure is not supplied to the hydraulic chamber 79, the flange spacing is minimized (belt pitch diameter R in the speed change pulley 7) due to the urging force of the disc spring 63 and the dampers 65 and 67 as shown in the lower half of FIG. ₍₁ maximum), the transmission pulley 5 receives the tension of the belt 61, and the flange spacing becomes maximum (belt pitch diameter R ₂ minimum) as in the upper half of FIG. 1, and the speed increasing ratio becomes minimum.

When the hydraulic pressure is supplied to the hydraulic chamber 79, the movable flange 29 is pressed by the speed change pulley 5 to narrow the flange interval and increase the belt pitch diameter R _{2 as} in the lower half of FIG. In the pulley 7, due to the belt tension, the flange spacing is widened as shown in the upper half of FIG. 1, the belt pitch diameter R ₁ is reduced, and the speed increasing ratio is increased. When the hydraulic pressure is maximized, the belt pitch diameter R ₂ is maximized, and R ₁ is minimized, the speed increasing ratio is maximized. The driving force of the engine input through the speed increasing gear set 3 is shifted as described above between the speed change pulleys 5 and 7 in response to the fluctuation of the engine speed, and the oil pump and the alternator are rotated at a predetermined speed. It is driven to rotate in the area.

The transmission torque between the speed change pulleys 5 and 7 fluctuates due to engine speed or load fluctuation of the oil pump and alternator or gear shifting, and when torque fluctuation occurs, the shaft of belt tension applied to the V groove 59. Vibration is transmitted to the disc spring 63 via the movable flange 39 due to the change in the directional component. Further, the movable flange 39 swings and rotates by the pressing force received from the contact portion with the belt 61, and the vibration is transmitted to the disc spring 63.

In this way, even if vibration is excited in the disc spring 63, unlike the conventional example, the vibration is absorbed and damped by the dampers 65 and 67 as described above, so that the movable flange due to the vibration of the disc spring 63 Abnormal wear between 39 and the belt 61 is prevented, and the service life of the speed change pulley 7 and the belt 61 is significantly improved.

In addition to the rubber damper, the vibration damping means of the disc spring is preferably an elastic body having a spring constant sufficiently smaller than that of the disc spring. Also, an oil damper may be formed with the disc spring as the oil chamber.

[0021]

[Effect of device]

 In the belt type continuously variable transmission according to the present invention, the vibration damping mechanism damps the vibration of the disc spring that applies tension to the belt by pressing the movable flange of the transmission pulley toward the fixed flange. Abnormal wear between the belt and the belt is prevented, and the life of the device is significantly extended.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment.

FIG. 2 is an enlarged view of a main part of FIG.

FIG. 3 is a sectional view of a conventional example.

[Explanation of symbols]

 1 Belt Type Continuously Variable Transmission 5, 7 Shift Pulley 27, 37 Fixed Flange 29, 39 Movable Flange 61 Belt 63 Disc Spring 65, 67 Damper (Vibration Damping Means) 79 Hydraulic Chamber (Shift Operating Means)

Claims (1)

[Scope of utility model registration request] 1. A pair of speed change pulleys, which are connected to each other via a belt mounted between a fixed flange and a movable flange and change a speed ratio of transmitted power according to a change in a belt pitch diameter according to a change in flange spacing, and a movable flange of the speed change pulley. To the fixed flange side to apply tension to the belt, vibration damping means to damp the vibration of the disc spring, and the movable flange of the speed change pulley against the belt tension to the fixed flange side to change the gear ratio. A belt-type continuously variable transmission, comprising: a speed change operation means for adjusting.