JPS6153574B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a forward/reverse rotation interlock operation device used in a mechanism having a forward/reverse rotation interlock device such as a traveling device. In an operating device that rotates the operating lever in the front-rear direction to switch between forward and reverse rotation of the interlocking device, the mechanism for fixing the operating lever at the neutral position between the forward rotation operating device and the reverse rotation operating device is complicated and cannot be stabilized. It tends to be difficult. This invention is
The purpose is to reliably fix the position of the operating lever by the shape of the cam surface that the shifter arm slides into.

For this reason, the present invention takes the following technical measures. That is, the cam body 6 has a forward rotation shifter arm 3 in sliding contact with one side 2 of the left and right rotation surface rotated by the operating lever 1, and a reverse rotation shifter arm 5 on the other side 4, respectively. Neutral cam surfaces 7 and 8 for maintaining the neutral position of both shifter arms 3 and 5 are formed to be approximately parallel to each other on the left and right, and the neutral cam surfaces 7 and 8 that are to maintain the neutral position of both shifter arms 3 and 5 are formed in a forward rotation side centering on the same neutral phase position A with respect to both shifter arms 3 and 5. In B, the forward rotation cam surface 9 is projected to one side to maintain the forward rotation shifter arm 3 at the forward rotation operation position C, and in the rear rotation side D, the forward rotation cam surface 9 is projected to the other side for the reverse rotation. The forward/reverse interlocking operation device has a configuration in which a reversing cam surface 10 is formed to maintain the shifter arm 5 at a reversing operation position E.

With this configuration, the present invention has the following technical effects. That is, by rotating the operating lever 1 in a relaxed direction, for example, the forward rotation, neutral, and reverse rotation positions are operated, but when the operating lever 1 is placed in the neutral position, the cam body 6 and the shifter The relationship between the arms 3 and 5 is such that the neutral cam surfaces 7 and 8 are in the same phase position, and the interlocking mechanism operated by both shifter arms 3 and 5 is maintained in a neutral state, and the operating lever 1 is moved forward. Then, the cam body 6 operates only the forward rotation shifter arm 3 to the forward rotation operation position C by the forward rotation cam surface 9 protruding to one side on the forward rotation side B, and also moves the operation lever 1 to the rear side. , the reverse rotation shifter arm 5 is actuated by the reverse rotation cam surface 10 on the rear rotation side D.
The interlocking mechanism can be switched between forward rotation, neutral rotation, and reverse rotation simply by rotating the operating lever 1 in one direction, such as forward or backward, and the operation is simple and easy, and when the cam body 6 is in the neutral position, Shifter arm 3 for forward rotation and shifter arm 5 for reverse rotation
is located at a lower part between the forward rotation cam surface 9 and the reverse rotation cam surface 10 on both left and right sides of the cam body 6, and
It is possible to maintain the neutral position reliably and accurately without rotating it to either the front or the rear.

In addition, in the drawing, 11 is a transmission case, a shifter shaft 12 is rotatably provided on one side, and the case 1
A shifter 13 is provided on the inside of the shifter 1, and shifter arms 3 and 5 are provided on the outside, and these are arranged symmetrically in a pair of left and right directions. A cam body 6 is mounted on a shaft 15 on a bracket 14 at the top of the case 11 so as to be movable up and down.
The cam body 6 has a fan-shaped side surface, and has neutral cam surfaces 7, 8, a normal rotation cam surface 9, and a reverse rotation cam surface 10 formed on both left and right sides along the outer peripheral edge. The neutral cam surfaces 7 and 8 have the central part of the cam body 6 at the same neutral phase position A, and from this, the neutral cam surface 7 extends linearly to the upper rear rotation side 2, and the neutral cam surface 8 extends to the lower forward rotation side. It extends straight to the side and is formed in a parallel shape. The normal rotation cam surface 9 is the neutral cam surface 7.
The reversing cam surface 10 extends continuously from the lower end of the neutral cam surface 8 to the front rotation side and projects to one side while forming an inclined surface in the middle. It extends to the other side and forms an inclined surface in the middle while protruding to the other side.

A roll is provided at each tip of the shifter arms 3 and 6 for normal rotation, and the shifter arm 3 for forward rotation is in sliding contact with one side surface 2, and the shifter arm 5 for reverse rotation is in sliding contact with the other side surface 4. The cam body 6 is connected to the operating lever 1 by an interlocking mechanism 16.

For example, the transmission case 11 has a cone-shaped friction ram 18 fixed to an upper main shaft 17, and a clutch drum 19 having friction surfaces on the outer peripheral surface on both left and right sides of the transmission case 11. 2
0 are provided to be slidable in the direction of the shaft 17, and these clutch drums 19 are provided to be slidably operable by engaging the shifter 13 of the forward rotation shifter arm 3,
Further, a shifter 13 of a shifter arm 5 for reverse rotation is engaged with the clutch drum 20.

Reference numerals 21 and 21 denote a speed change drive pulley provided on the main shaft 17, 22 an intermediate shaft, to which a gear 24 that meshes with a gear 23 integrated with the clutch drum 19 of the main shaft 17 is fixed, and a back gear is connected from a gear 25 integrated with the clutch drum 20. A gear 26 that engages and rotates through a clutch 37 is rotatably provided, and this gear 26 and a pawl clutch 27
Gears 28 that engage with each other are provided to rotate together, and an interlocking gear 29 is provided to rotate together.

A gear 31 that meshes with the gear 29 is integrally provided on the lower rotating shaft 30, and clutch gears 34, 34 that mesh with the wheel gears 33, 33 of the wheel axles 32, 32 are provided on both left and right sides of the gear 31, and both clutch gears 34 , 34 is provided with a claw 36 that engages with a claw 35 formed on the side wall of the case 11.
A side clutch is formed between the clutch and the gear 31, and when the clutch is disengaged, the claws 35, 3
The handbrake is activated by engagement of 6. 38 and 39 are shifters.

When the operating lever 1 is located at the center of the rotation operating range, the cam body 6 is in the neutral position (Fig. 1).
At this time, each shifter arm 3, 5 is in the neutral same phase position A, which is the boundary between cam surfaces 7 and 9, and the boundary between cam surfaces 8 and 10, on the opposing sides 2, 4, and the cam body 6 Even if it tries to rotate upward, the forward rotation side shifter arm 3 is restricted from rotating by the slope of the forward rotation cam surface 9, and even if it tries to rotate downward, the rotation of the reverse rotation side shifter arm 5 is restricted by the rotation of the reverse rotation cam surface 9. Rotation of the cam body 6 is restricted by the inclination of the surface 10, and the cam body 6 does not naturally rotate in any direction.

In this way, when the cam body 6 is rotated from the neutral position to the upper example by the operating lever 1, the forward rotation side shifter 3 is operated in the direction of the arrow C by the forward rotation cam surface 9. The shifter 13 presses the clutch drum 19 against the friction drum 18 to shift gear 2.
3 and gears 24, 29, 31, 34, 3
The wheel axles 32, 32 are rotationally interlocked via the wheels 4, 33, 33 to rotate forward. When the cam body 6 is rotated downward, the reverse shifter 5 is actuated in the direction of arrow H by the reverse cam surface 10, and the shifter 13 presses the clutch drum 20 against the friction drum 18 to shift the gear. 25, gears 37, 26, 2
The wheel axles 32 and 32 are interlocked in reverse rotation through the wheels 8, 29, 31, 34, 34, 33, and 33 to rotate backward.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a partially sectional front view, Fig. 2 is a side view thereof, Fig. 3 is a front sectional view of the transmission device, and Fig. 4 is a side sectional view thereof. It is a diagram. In the figure, 1 is the operating lever, 2 is one side, 3 is the shifter arm for forward rotation, 4 is the other side, 5 is the shifter arm for reverse rotation, 6 is the cam body, 7 and 8 are the neutral cam surfaces, and 9 is the forward cam 10 is the reverse rotation cam surface, A is the neutral same phase position, B is the forward rotation side, C is the forward rotation operation position, D is the rear rotation side, and E is the reverse rotation operation position.

Claims (1)

[Claims] 1. A shifter arm for forward rotation interlocking is slidably connected to one side of the left and right rotating surface rotated by the operating lever, and a shifter arm for reverse rotation is slidably contacted to the other side of both shifter arms. The neutral cam surfaces that should maintain the neutral position are formed to be approximately parallel to each other on the left and right sides, and the shifter arm for forward rotation is made to protrude to one side on the forward rotation side with respect to the same neutral phase position with respect to both shifter arms. A normal rotation cam surface that is to be maintained in the forward rotation operation position, and a reverse rotation cam surface that is projected to the other side on the rear rotation side to maintain the reverse rotation shifter arm in the reverse rotation operation position. Interlocking operation device.