JPH09217830A - Gear shift device for transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily apply an energizing force on a fork operation shaft through simple and small structure without increasing the number of parts and to prevent provision of an operation feeling with a feeling of a physical disorder. SOLUTION: A gear shift device for a transmission comprises a fork operation shaft 14 axially slidably attached to the upper case 16 of a transmission and rotated around an axis in given first and fourth positions during slide to operate a shift fork; an operation shaft brake lever 19 fixed at a fork operation shaft; a plunger 18 having a contraction part 18a and slidably arranged and protruding in such a manner to make contact with a brake lever through the force of a main spring 21; and a lock ball 23 arranged in an upper case and forced into pressure contact with the drum part of a plunger through the force of an auxiliary spring 22. When a fork operation shaft is moved between the second position and the fourth position, the plunger makes contact with the brake lever, the length of the contraction part conforms to a distance between the second and third positions and is sized enough to allow entrance of the lock ball to the contraction part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle transmission remotely controlled by an operating rod provided in a driver's seat.
More specifically, a fork operating shaft that rotates about an axis at predetermined first, second, third, and fourth positions when sliding in the axial direction is provided, and the first position is the high-speed stage position and the second position. To a middle speed position, a third position to a low speed position, and a fourth position to a reverse speed position.

[0002]

2. Description of the Related Art Conventionally, in a gear shift device for a transmission such as a truck, an operating rod provided in a driver's seat and a fork operating shaft provided in the transmission are connected by a rod. This connection method includes a single connection method using one rod and a double connection method using two rods or a wire cable. In the case of the double type, the longitudinal movement of the rod or the wire cable by operating the operating rod is converted into the sliding or rotating movement of the operating shaft near the transmission. This conversion is performed by arranging the wire cable if it is a wire cable, and when using a rod, the longitudinal movement of the rod is converted into a rotational movement using a crank mechanism, and the rotational movement is changed in angle. It is converted to linear motion by a link mechanism. As described above, by sliding the fork operation shaft in the axial direction or rotating it around the axis, it is possible to select an appropriate gear according to the traveling speed of the vehicle.

FIG. 8 shows an upper case 6 of a transmission provided with a general fork operating shaft 4. Fork operation shaft 4
Is mounted so as to be slidable in the axial direction.
The shift fork (not shown) is operated by rotating around the axis at the second, third and fourth positions. In addition, a plunger 8 is provided in the upper case 6 so as to be slidable in parallel with the fork operation shaft 4, and an operation shaft braking lever 4 a is fixed to the fork operation shaft 4. A reduced diameter portion 8a is formed on the body of the plunger 8, and is configured to protrude by the main spring 2 so that its tip abuts on the braking lever 4a. The upper case 6 is further provided with a lock ball 7 pressed against the body of the plunger 8 by an auxiliary spring 7a. In this transmission, the first position is the high speed position, the second position is the medium speed position, the third position is the low speed position, and the fourth position is the reverse speed position. The fork operating shaft 4 of the plunger 8 is in the third position. When the fork operating shaft 4 is in the third position, the lock ball 7 is configured to enter the reduced diameter portion 8a when the fork operating shaft 4 is in the third position. Therefore, when the driver intends to move the fork operating shaft 4 from the first, second and third positions, which are the gears for moving the vehicle forward, to the fourth position in order to move the vehicle backward, the driver inserts the lock ball 7 into the lock ball 7. It is necessary to overcome the resulting force to move, and this force can prevent the driver from moving to the reverse gear while the vehicle is traveling.

Further, in the conventional gear shift device of the transmission, when the gear for forward movement is selected, the fork operating shaft 4 is set between the first and second positions so that the driver can select a desired gear by touch. A biasing force is generated to sense whether the position is between the second and third positions. This urging force is provided by a spring 3 provided on the fork operation shaft 4. One end of the spring 3 is in contact with the upper case 6 via a ring 4b, and the other end is in contact with a boss 4d of a brake lever 4a fixed to the fork operation shaft 4 via a ring 4c. The spring 3 is provided on the fork operation shaft 4 at the first position or the fourth position depending on the position where the urging force is required. When the spring is provided on the fourth position side, as shown in the drawing, the ring 4c is provided so as to contact the other end of the spring 3 when the fork operation shaft 4 is in the second position, and the fork operation shaft 4 is The urging force is applied to the fork operation shaft 4 when moving from the second position to the third position and the fourth position. By adding the biasing force, the driver can select a gear by touch without visually confirming the position of the operating rod.

[0005]

However, providing the spring 3 on the fork operating shaft causes an increase in the number of parts,
There is a problem that the transmission unit price is increased due to an increase in the number of assembly steps. In addition, there is also a problem that the size and complexity of the device are increased due to the built-in spring. An object of the present invention is to add a biasing force to the fork operating shafts that makes it easy to detect the shift position of each fork operating shaft with a simple and small structure without increasing the number of parts, and to provide a feeling of operation. An object of the present invention is to provide a gear shift device for a transmission that does not give a feeling of strangeness.

[0006]

The invention according to claim 1 is
As shown in FIGS. 1 and 6, the upper case 16 of the transmission is provided.
Is mounted slidably in the axial direction, and when sliding, the first,
A fork operating shaft 14 for operating the shift fork 11 by rotating about the shaft center at the second, third, and fourth positions, an operating shaft braking lever 19 fixed to the fork operating shaft 14, and a contraction to the body. A plunger 18 provided with a diameter portion 18a and provided in the upper case 16 so as to be slidable in parallel to the fork operating shaft 14 and protruding so as to come into contact with the braking lever 19 by the main spring 21, and a plunger 18 provided in the upper case 16. And a lock ball 23 pressed against the body of the auxiliary spring 22. The first position is the high speed position, the second position is the middle speed position, the third position is the low speed position, and the fourth position is
This is an improvement of the gear shift device of the transmission in which the position is set to the reverse gear position. The characteristic configuration is that the plunger 18 contacts the braking lever 19 when the fork operating shaft 14 moves between the second position and the fourth position, and the reduced diameter portion 18a has the second length.
The lock ball 23 is configured to be able to enter the reduced diameter portion 18a in accordance with the distance between the position and the third position. When the fork operating shaft 14 moves from the first position to the second position, the plunger 18 does not come into contact with the braking lever 19, and the fork operating shaft 14 is not biased. When the fork operating shaft moves from the second position to the fourth position, the plunger 18 contacts the braking lever 19 and the main spring 21 exerts an urging force on the fork operating shaft 14. For movement of the fork operating shaft between the third position and the fourth position, the force resulting from the insertion of the lock ball 23 is overcome and the lock ball 23 is pushed out from the reduced diameter portion 18a and then moved.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment of the present invention will be described in detail with reference to the drawings. 2. Description of the Related Art Automobiles are equipped with a transmission for effectively exhibiting the output of an engine according to a running state. Inside the transmission, a plurality of transmission gears are arranged on a main shaft, and a desired transmission gear can be selected by a shifter fork 11 shown in FIG. The shifter fork 11 is fixed to a fork shaft 12, and a plurality of transmission gears can be selected by slidably mounting a plurality of fork shafts 12 to which the shifter fork 11 is fixed in parallel to a transmission. Gear is fork shaft 12
Is selected via the shifter hawk 11 by sliding, and the sliding of the fork shaft 12 causes the shifter lever 1 to move.
3 is performed.

As shown in FIG. 7, the shifter lever 13 is fitted into the fork operating shaft 14 and is fixed by mounting the fork operating shaft 14 on the upper case 16 of the transmission, and the fork operating shaft 14 is axially fixed. It is mounted so that it slides and is rotatable about its axis. Returning to FIG. 6, the fork operation shaft 14 slides in the axial direction as indicated by the solid line arrow, thereby selecting one of the fork shafts 12, and the fork operation shaft 14 rotates as indicated by the broken line arrow. Thus, the selected fork shaft 12 is configured to slide via the shifter lever 13.

Although not shown, the driver's seat is provided with an operating rod for operating the operating shaft 14 in the select direction in which it slides in the axial direction and in the shift direction in which it rotates about the axis. The operating rod is provided so as to project upward from the inside of the box body.
It is configured so that it can be operated in a pattern as shown in FIG. The operation rod (not shown) and the fork operation shaft 14 provided on the transmission are connected by a rod (not shown). When the operation rod is moved in the vehicle width direction as indicated by an arrow in the select direction in the figure, the operation shaft 14 slides. When the vehicle is moved in the vehicle front-rear direction as indicated by the shift direction arrow in the drawing, the operation shaft 14 is rotated.

As shown in FIGS. 1 to 4, the fork operating shaft 14 has an axial center at a predetermined first, second, third and fourth position corresponding to the shift position of the operating rod when sliding in the axial direction. Each gear (not shown) corresponding to the position selected by the operating rod is rotated to rotate. This transmission is in the high gear position in the first position shown in FIG. 2 and is in the 5th or 6th speed shown in FIG. 5 (a).
In the second position shown in FIG.
The third speed or the fourth speed shown in (a), the first speed or the second speed shown in FIG.
Further, in the fourth position shown in FIG. 4, the reverse gear shown in FIG. 5A can be selected. In addition to this, the upper case 16 has a plunger 18 for the fork operating shaft 1.
4 is slidably provided parallel to the fork operating shaft 1
An operation shaft braking lever 19 is fixedly attached to 4. As shown in FIGS. 6 and 7, the operation shaft braking lever 19 is integrally processed with the shifter lever 13, and moves according to the movement of the shifter lever 13 as the fork operation shaft 14 slides. FIG.
~ Returning to FIG. 4, the reduced diameter portion 18 is provided on the body of the plunger 18.
a is formed and is projected by the main spring 21 so that its tip comes into contact with the braking lever 19. The upper case 16 is further provided with a lock ball 23 which is pressed against the body of the plunger 18 by an auxiliary spring 22.
The auxiliary spring 22 increases the resistance when sliding over the reduced diameter portion 18a of the plunger 18 via the lock ball 23.

The characteristic construction of the present invention is that the plunger 18 contacts the braking lever 19 when the fork operating shaft 14 moves between the second position shown in FIG. 1 and the fourth position shown in FIG. The length of 18a corresponds to the distance between the second position shown in FIG. 1 and the third position shown in FIG. 3 so that the lock ball 23 can enter the reduced diameter portion 18a. Therefore, when the fork operation shaft 14 moves between the first position and the second position among the first, second, and third positions that are the gears for advancing the vehicle, the plunger 18 contacts the braking lever 19. Without moving freely in this range, the plunger 18 abuts the braking lever 19 between the second position and the third position, and the urging force for returning by the main spring 21 between the first position and the second position is applied. Given. Further, in order to move the fork operating shaft 14 from the third position to the fourth position for retracting the vehicle, a force that overcomes the force resulting from the insertion of the lock ball 23 is given, and the lock ball 23 is pushed out from the reduced diameter portion 18a. It is necessary to move it.

In the gear shift device of the transmission constructed as described above, the driver starts or retreats the vehicle or selects the transmission gear according to the vehicle speed by operating the operating rod provided in the driver's seat at a desired position, not shown in the drawings. Move while stepping on. The movement of the operating rod is transmitted to the transmission via a rod (not shown). The movement in the shift direction by the operating rod causes the fork operating shaft 14 to slide in the axial direction, and the urging force of the fork operating shaft 14 by the main spring 21 is applied to the operating rod via the rod. Therefore, the driver can feel the urging force transmitted to the operating rod with his / her touch, and must operate the operating rod by overcoming this urging force. Next, the force required by the driver to operate the operating rod will be described with reference to the diagram shown in FIG. First, when the fork operating shaft 14 is moved from the first position shown in FIG. 2 to the second position shown in FIG. 1, the plunger 18 does not contact the braking lever 19,
The operation rod can be operated with a force as small as the sliding resistance of the fork operation shaft 14 shown by the solid line in FIG. 5 (b). When the fork operating shaft 14 is moved from the second position shown in FIG. 1 to the third position shown in FIG. 3, the plunger 18 is moved.
Touches the braking lever 19, so that the operating rod is operated by a force that overcomes the urging force of the main spring 21. The fork operating shaft 14 is moved from the third position shown in FIG. 3 to the fourth position shown in FIG.
To move it to the position, the plunger 18
Since the lock ball 23 is in contact with the main body and the lock ball 23 is fitted in the reduced diameter portion 18a, the force for operating the operating rod is the main spring 21.
It is operated by the force that pushes out the lock ball 23 and overcomes the urging force of.

Next, when returning from the fourth position shown in FIG. 4 to the third, second and first positions, the urging force of the main spring 21 causes the second position as shown by the broken line in FIG. 5 (b). The force to move the operating rod becomes a negative force until
When moving to the position, the plunger 18
Since it does not abut, the operating force of the operating rod is as small as the sliding resistance of the fork operating shaft 14.

[0014]

As described above, according to the present invention, the plunger comes into contact with the braking lever when the fork operating shaft moves between the second position and the fourth position, and the length of the reduced diameter portion is the first. Since the lock ball is configured to be able to enter the reduced diameter portion in accordance with the distance between the second position and the third position, the fork operation shaft is moved to the second
When moving from the fourth position to the fourth position, the plunger comes into contact with the braking lever to generate a biasing force on the fork operating shaft by the main spring, and when the fork operating shaft moves from the third position to the fourth position, the lock ball is moved. It is necessary to push out the lock ball from the reduced diameter portion to overcome the force caused by the insertion of the lock ball. As a result. A biasing force for sensing the shift position of each fork operating shaft can be easily applied to the fork operating shaft with a simple structure without increasing the number of parts. Further, since the main spring generates an urging force, it is not necessary to separately provide a spring, the gear shift device itself can be downsized, and the operation feeling does not feel uncomfortable. Further, the urging force generated by the main spring allows the driver to select a desired gear by touching it, and it is possible to prevent a malfunction of the operating rod while the vehicle is traveling.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of the gear shift device of the present invention in a state where a fork operating shaft is in a second position, taken along the line AA of FIG. 6;

FIG. 2 is a cross-sectional view corresponding to FIG. 1 of the gear shift device in which a fork operation shaft is in a first position.

FIG. 3 is a cross-sectional view corresponding to FIG. 1 of the gear shift device in a state where a fork operation shaft is in a third position.

FIG. 4 is a cross-sectional view corresponding to FIG. 1 of the gear shift device in which the fork operation shaft is in the fourth position.

FIG. 5A is a diagram showing a pattern in which an operating rod moves in a select direction or a shift direction. (B) The figure which shows the change of the operation force at the time of moving the operation lever between the 1st position and the 4th position in the selection direction.

FIG. 6 is a cross-sectional view illustrating a relationship among a fork operation shaft, a fork shaft, and a shifter lever.

FIG. 7 is a perspective view showing a state where the fork operation shaft is assembled to the upper case via a shifter lever.

FIG. 8 is a diagram corresponding to FIG. 1 showing a conventional example.

[Explanation of symbols]

 11 Shift Hawk 14 Fork Operation Axis 16 Upper Case 18 Plunger 18a Reduced Diameter 19 Operation Axis Braking Lever 21 Main Spring 22 Auxiliary Spring 23 Lock Ball

Claims (1)

[Claims] 1. A transmission is mounted on an upper case (16) of a transmission so as to be slidable in an axial direction, and is rotated around an axis at predetermined first, second, third and fourth positions during sliding. Shifter fork (11)
A fork operating shaft (14) for operating the fork operating shaft, and an operating shaft braking lever fixed to the fork operating shaft (14).
(19), and a reduced diameter portion (18a) formed on the body, and provided on the upper case (16) slidably in parallel with the fork operating shaft (14) by the main spring (21). A plunger (18) protruding so as to come into contact with (19), and a lock ball which is provided in the upper case (16) and is pressed against the body of the plunger (18) by an auxiliary spring (22).
(23), wherein the first position is a high gear position, the second position is a medium gear position, the third position is a low gear position, and the fourth position is a reverse gear position. In the device, the plunger (18) contacts the braking lever (19) when the fork operating shaft (14) moves between the second position and the fourth position, and the plunger (18) of the reduced diameter portion (18a) The lock ball (23) has a length corresponding to the distance between the second position and the third position.
A gear shift device for a transmission, characterized in that the gear shift device is capable of penetrating into (18a).