JP3267678B2 - Guide member for movable pulley - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an automatic transmission for light vehicles such as family motorcycles, snowmobiles, and water jets, an automatic transmission as an auxiliary device for a four-wheeled vehicle such as a supercharger, an agricultural machine, and an automatic transmission for general industry. The present invention relates to a movable pulley guide member used for a transmission or the like.

[0002]

2. Description of the Related Art In order to facilitate the understanding of the present invention, a guide member for a movable pulley of a V-belt type automatic transmission will be described with reference to an application example shown in FIG. This will be described below.

[0003] Reference numeral 11 denotes a drive shaft, and 12 denotes a movable pulley whose groove width changes. Consists of Further, a V-shaped groove 15 is formed between the fixed plate 13 and the movable plate 14.

[0006] Reference numeral 16 denotes a driven shaft disposed in parallel with the drive shaft 11. Reference numeral 17 denotes a driven movable pulley. The pulley 17 includes a fixed plate 18 fixed to the driven shaft 16 and a driven shaft 16.
And a movable plate 19 slidable in the axial direction. The pulley 12 on the driving side and the pulley 17 on the driven side
The V-belt 20 is suspended between them.

First, an automatic shifting operation of the transmission will be briefly described with reference to FIG.

When the rotational speed of the drive shaft 11 increases, the width of the V-shaped groove 15 gradually decreases, and the V-belt 20
2, and the winding diameter of the V-belt 20 increases.

In response, on the driven side, the V-belt 20
Move inward in the radial direction, and the movable plate 19 moves in a direction away from the fixed plate 18. In this way,
The winding diameter of the V-belt 20 around the pulley 17 is reduced (reduction ratio is reduced), and the rotation speed of the driven shaft 16 is increased.

Conversely, when the rotation speed of the drive shaft 11 decreases,
As the width of the V-shaped groove 15 gradually increases, the V-belt 20 comes into contact with the inner side of the pulley 12, and the winding diameter of the V-belt 20 decreases. Therefore, on the driven side, the V-belt 20 moves radially outward, the winding diameter of the V-belt 20 increases (the reduction ratio increases), and the rotation speed of the driven shaft 16 decreases.

As described above, when the number of revolutions of the drive shaft 11 changes and the contact position of the V-belt 20 with the pulley 12 or 17 changes, the rotation of the drive shaft 11 automatically changes steplessly, The speed is transmitted to the shaft 16 to perform the speed change.

During the shifting operation, the movable plate moves toward the fixed plate, or moves away from the fixed plate. Therefore, a guide member for guiding the movement of the movable plate is required, and the present invention relates to this guide member. FIG.
FIG. 3 is an exploded perspective view showing a movable plate, a fixed plate, and a guide member on the driven side in an enlarged manner. As shown in FIG. 1, a plurality of protrusions 1
Are formed. Reference numeral 2 denotes a guide member, in which a plurality of guide pieces 4 having through holes 3 through which the projections 1 can be inserted are integrally formed in a ring shape. The fixed plate 18 is formed with a through hole 5 into which the guide small piece 4 can be fitted. The guide member 2 is fixed to the fixed plate 18 by fitting each guide small piece 4 into the through hole 5. In such a configuration, the movable plate 19 is guided so as to move to the fixed plate 18 side or move away from the fixed plate 18 while the protrusion 1 is inserted into the through hole 3 of the guide piece 4 and slides under pressure. You. For this reason, the guide member needs to be made of a material excellent in slidability, rigidity, heat resistance and the like. Conventionally, 66 nylon has been used.

[0011]

SUMMARY OF THE INVENTION The guide member has a vibration reduction such as a reduction in friction loss due to sliding contact with a projection caused by expansion and contraction of a pulley diameter and a reduction in belt pulsation for preventing belt heat generation due to belt pulsation. Although it is expected to have a sexual function, conventionally used materials could not sufficiently satisfy this demand. In addition, with the downsizing of the transmission and the diameter of the pulley, the speed has been increased, and the heat resistance of the belt has been improved. Therefore, improvements to the belt itself, such as application of heat-resistant polymers and shape improvement, have been made. However, this has limited the freedom of design of the transmission, and as a result, the overall cost has been high.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and has as its object to improve the durability of a belt and reduce the overall cost of a transmission. An object of the present invention is to provide a movable pulley guide member having vibration characteristics.

[0013]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention provides a movable pulley comprising a fixed plate fixed to a drive shaft or a driven shaft and a movable plate slidable in the axial direction. A guide member for guiding the movable plate in the axial direction, wherein a plurality of guide pieces are integrally formed in a ring shape, the bending elastic modulus is 200 to 5000 kg / cm ² , and the loss coefficient is It is characterized by comprising an elastic member of 0.03 or more.

Examples of the elastic member include a thermoplastic elastic member such as polyamide, polyester, urethane, and styrene, and a synthetic rubber such as CR, NBR, CSM, and FKM.

In consideration of heat resistance, oil resistance and mass productivity, a polyamide-based thermoplastic elastic member is preferable.

[0016]

The belt of the V-belt type automatic transmission is pulsated by the driven pulley and easily generates heat. However, by forming a guide member that guides the movable plate in the axial direction with an elastic member having vibration damping properties, This pulsation can be absorbed.

[0017]

Embodiments of the present invention will be described below.
Drive side pulley diameter is 46.8mm, driven side pulley diameter is 8
A guide member having a shape as shown in FIG. 1 and a material as shown in Table 1 below is mounted on the fixed plate side of the V-belt type automatic transmission having a length of 7.1 mm and a distance between both pulley shafts of 208 mm, A CR rubber belt was stretched between the driving and driven pulleys, and rotated at room temperature of 25 ± 3 ° C., at a rotation speed of 6,500 rpm, and at a rotation torque of 0.434 kg · m. Table 1 shows data on the physical properties of each guide member subjected to this test and the durability of each guide member.

In Table 1, the appearance of the guide member indicates the appearance when the belt is cracked, the belt durability time indicates the time from the start of rotation to the occurrence of cracks in the belt, and the belt temperature indicates the time when the belt is cracked. Indicates the temperature at which the crack occurred.

[0019]

[Table 1]

As apparent from Table 1, in the comparative example, the guide member cannot sufficiently absorb the pulsation of the belt, so that the durability of the belt is poor. However, the one according to the embodiment of the present invention has an appropriate flexural modulus and thus has excellent followability to deformation, and has a loss coefficient of 0.03 or more, so that it can effectively absorb vibration energy. As a result, the rise in the belt temperature is small, and the durability of the belt is excellent. (Long durability time)

[0021]

The guide member for a movable pulley according to the present invention is constructed as described above, and has the following effects.

Since the guide member according to the present invention has excellent vibration damping properties, it effectively absorbs the pulsation of the belt caused by the shift operation. As a result, the temperature rise of the belt is small, and the life of the belt is extended.

As a result of improving the durability (life) of the belt, it is possible to reduce the cost of the entire transmission.

Accordingly, it is possible to sufficiently cope with the speeding-up accompanying the downsizing of the transmission and the diameter reduction of the pulley.

[Brief description of the drawings]

FIG. 1 is an enlarged exploded perspective view of a movable plate, a fixed plate, and a guide member on a driven side.

FIG. 2 is a plan view including a cross section of the V-belt type automatic transmission.

[Description of Signs] 2 ... Guide member 11 ... Drive shaft 16 ... Followed shaft 12, 17 ... Pulley 13, 18 ... Fixed plate 14, 19 ... Movable plate

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Toshio Miura 1-4-1 Chuo, Wako-shi, Saitama Pref. Honda Research Institute Co., Ltd. (72) Inventor Kenji Nishida 3-2-2 Meiwadori, Hyogo-ku, Kobe-shi, Hyogo No. 15 Inside Bando Chemical Co., Ltd. (72) Inventor Cho Uesugi 3-2-1 Meiwadori, Hyogo-ku, Kobe City, Hyogo Prefecture Inside Bando Chemical Co., Ltd. (56) References JP-A-62-88874 (JP, A) Kaihei 2-120363 (JP, A)

Claims (1)

(57) [Claims] 1. A guide member for guiding a movable pulley comprising a fixed plate fixed to a drive shaft or a driven shaft and a movable plate slidable in the axial direction to move the movable plate in the axial direction. , Multiple guide pieces are ring-shaped
And has a flexural modulus of 200
A guide member for a movable pulley, comprising an elastic member having a loss coefficient of 0.03 kg / cm ² or more and 0.03 or more.