JP2592434Y2 - Speed change pulley - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a variable speed pulley used in a belt-type continuously variable transmission that can change the width of a V-groove. It relates to a pulley.

[0002]

2. Description of the Related Art A belt-type continuously variable transmission changes the speed ratio steplessly by winding a belt around a pulley in which the V-groove width of the pulley changes and changing the width of the V-groove. V of the speed change pulley constituting the belt type continuously variable transmission
The groove is composed of a fixed pulley piece fixed to the shaft and a movable pulley piece movable in the axial direction with respect to the fixed pulley piece.
As means for moving the movable pulley piece, there is a means using a spring or a means using a hydraulic cylinder, which automatically changes according to the number of revolutions of the engine and the magnitude of the torque. For example, in the case where the load to be applied is relatively low and the frequency of shifting is low, for example, used for agricultural machines, there is a type in which shifting is performed by rotating a manual lever.

In such a belt-type continuously variable transmission, a member 32 is rotatable with respect to a movable pulley piece 31 as shown in FIG. In some cases, the movable pulley piece 31 is moved by shifting the bolt 33 through the bolt 33 to change the speed. In addition, the transmission lever 41 shown in FIG. 3 is rotated to change the speed via the cam mechanism 42, and the hook 43 is lifted up depending on the moving direction of the transmission lever 41.
When the hook 43 is in contact with the gear 44 and the shift lever 41 is not rotated, the shift lever 41 is fixed so as not to move.

[0004]

However, in the transmission shown in FIG. 2, it is necessary to turn the bolt 33 to perform the shifting operation, so that the operation itself cannot be performed easily. 3 can be shifted by operating the shift lever 41, which is different from the above, so that the operation is simple, but the movement of the shift lever 41 is engaged with the hook 43. It is restricted by the gear 44 and cannot be strictly referred to as continuously variable transmission.

Accordingly, an object of the present invention is to provide a speed change pulley in which a speed change operation can be easily performed with a lever, and a complete stepless speed change can be achieved.

In order to achieve such an object, the present invention has a fixed pulley piece that moves integrally with a shaft, and a movable pulley piece that can move at least in the axial direction with respect to the fixed pulley piece.
A shift pulley provided with a manual shift lever as a means for moving the movable pulley piece in the axial direction, wherein a member that rotates with respect to the shaft integrally with the movement of the shift lever and a boss portion of the movable pulley piece. A cam mechanism is formed between the member whose movement in the direction is restricted, and a wedge fitting that can be manually slid is provided integrally with the shift lever, and the shaft is rotated in the shaft rotation direction via a bearing. V-shaped grooves are disposed, the wedge fitting together are I Mari fitting engagement within the V-shaped groove, slide the wedge bracket
And lift it out of the V-shaped groove to create a groove in the V-shaped groove.
Characterized by being configured to be able to move along .

[0007]

The shift pulley of the present invention can be shifted by a shift lever, and the operation itself is very simple.
When the shift lever is not moved, the lever is fixed by fitting the slidable wedge fitting on the shift lever into the V-shaped groove that is not rotating. It can be said that an arbitrary value can be obtained for the ratio and that the transmission is completely continuously variable.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. The speed change pulley 1 of the present invention is provided with a fixed pulley piece 3 rotating integrally with the shaft 2 and a movable pulley piece 5 opposed to the fixed pulley piece 3, and the movable pulley piece 5 slides in the axial direction with respect to the shaft 2. It is possible. Boss portion 5a of movable pulley piece 5
, A bearing 6 is mounted, and a cylindrical member 7 is arranged via the bearing 6 in such a manner as to be restricted only in the axial direction.

A cam groove 7a is provided on the outer periphery of the cylindrical member 7, and a cam roller 8 is fitted in the cam groove 7a to form a cam mechanism 9. The cam roller 8 is connected to the speed change lever 10, and moves the movable pulley piece 5 toward or away from the fixed pulley piece 3 via the cam mechanism 9 by moving the speed change lever 10.

The speed change lever 10 has a function of fixing the gear at the position when the speed change operation is completed. A wedge fitting 14 is connected and fixed to the shift lever 10. The wedge fitting 14 is fitted into a V-shaped groove 15, and the V-shaped groove 15 is independent of the movable pulley piece 5, the fixed pulley piece 3 and the shaft 2, and is always provided with the speed change pulley 1.
6, etc., and is in a stationary state.

Wedge fitting 1 in V-shaped groove 15 at rest
When the wedge 4 is fitted, the wedge 14 is fixed to the V-shaped groove 15 by the frictional force of the wedge effect, and the shift lever 10 connected to the wedge 14 is also fixed.

The shift position can be fixed easily by a shift operator using the grip portion 11 of the shift lever 10. The brake lever 12 is attached to the grip portion 11 of the shift lever 10.
Is attached, by kicking closer the brake lever 12 to the shift lever 10 handful unit 11, the wire 13 was connected to the brake lever 12 is pulled, configured to wedge member 14 away from the V-shaped groove 15 by sliding Have been. That is, the brake lever 1 on the grip 11
2, the wedge fitting 14 is moved from the V-shaped groove 15
Floating gear shift lever 10 is free from V-shaped groove 15
Thus, it is possible to move inside the V-shaped groove 15 along the groove.
You. Then, when the brake lever 12 is released, the wedge fitting 14 is automatically returned to the V-shaped groove 15.
The guide bar 1 is attached to the cylindrical body 18 between the
7 has passed through, the tubular body 18 a wedge member 14 to the lower portion of the upper extension portion 18a on the end attached is the cylindrical body 18 of the wire 13 is connected, the stopper further the upper end of the guide bar 17 A coil spring 20 is provided between the stopper 19 and the upper extension 18a of the cylindrical body 18.

The speed change pulley 1 of the present invention having such a structure is as follows.
When the brake lever 12 of the shift lever 10 is depressed, the shift lever 10 is brought into a movable state and a shift operation can be performed. When the brake lever 12 is released, the wedge fitting 14 is fitted into the V-shaped groove 15 fixed to the housing 16, and the shift lever 10 is fixed in movement. As described above, the shift lever 10 can be fixed or movable only by grasping or releasing the brake lever 12 , and the wedge fitting 14 moves along the V-shaped groove 15 along the groove.
The shift lever 10 is V-shaped because it is configured to move.
It can be fixed at any position of the groove 15, and the shift can be said to be a complete stepless shift . Therefore, the present invention
It can be said that the speed change pulley 1 is a speed change pulley that can effectively use a stepless speed change by a belt and can change the speed very easily. Also, when shifting,
The wedge fitting 14 is floating from the V-shaped groove 15
That the wedge fittings 14 and V-shaped grooves 15 are worn.
Nor.

[0014]

[Effect of the invention] The speed change pulley of the invention is a brake lever.
The shift lever can be fixed or movable just by gripping or releasing
State, and the wedge fittings
It is configured to move along the groove.
Can be fixed at any position of the V-shaped groove,
Can be said to be a complete stepless shift. Therefore,
With the proposed speed change pulley, stepless speed change operation can be easily performed with the speed change lever.
Can be done simply and without parts wear, parts
To obtain a speed change pulley that does not require replacement
Can be.

[Brief description of the drawings]

FIG. 1 is a sectional view of the speed change pulley of the present invention.

FIG. 2 is a sectional view showing a conventional transmission.

FIG. 3 is a side view showing a conventional transmission.

[Explanation of symbols]

 Reference Signs List 1 speed change pulley 2 shaft 3 fixed pulley piece 5 movable pulley piece 6 bearing 7 cylinder upper member 7a cam groove 8 cam roller 9 cam mechanism 10 speed change lever 11 gripping portion 12 brake lever 13 wire 14 wedge fitting 15 V-shaped groove 16 housing 17 guide bar 18 cylindrical body 19 stopper 20 coil spring

──────────────────────────────────────────────────続 き Continuing from the front page Examiner Ichiro Kotani (56) References JP-A-62-77222 (JP, A) JP-A-57-82240 (JP, U) JP-A-49-140825 (JP, U) Kaisho 55-129127 (JP, U) Jikken 38-5299 (JP, Y1) (58) Fields investigated (Int. Cl. ⁶ , DB name) F16H 9/00-9/26 F16H 59/00- 59/12 B60K 20/00-20/08

Claims (1)

(57) [Scope of request for utility model registration] 1. A manual transmission having a fixed pulley piece that moves integrally with a shaft and a movable pulley piece that can be moved at least in the axial direction with respect to the fixed pulley piece, and as a means for moving the movable pulley piece in the axial direction. In a shift pulley provided with a lever, a cam mechanism is provided between a member that rotates with respect to the shaft integrally with the movement of the shift lever and a member that is restricted from moving in the axial direction with respect to the boss portion of the movable pulley piece. Has formed,
Further, a wedge fitting that can be manually slid is provided integrally with the shift lever, and a V-shaped groove is disposed on a shaft via a bearing, and the wedge fitting is provided with the V-shaped groove.
With matches fits into the shaped groove, slide a wedge bracket
The V-shaped groove by floating the V-shaped groove
A speed change pulley configured to be movable along a groove .