JPS6211219Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a gear slippage prevention device in a transmission gear shift control device.

In a remote control type transmission gear shift control device, a shift shaft is connected to a gear shift mechanism inside a transmission case, and this shift shaft is protruded outside the transmission case and is operated via a link. It is connected to a shift change lever located in the chamber. Conventional devices of this type are provided with a gear slippage prevention mechanism in order to prevent gear slippage (maintain the shift position) after a shift operation. This gear slippage prevention mechanism includes a shift groove provided in a shift fork rod in a transmission case, and a locking ball pressed into this shift groove by a spring.

However, such conventional gear slippage prevention mechanisms utilize spring force, so if the spring force is weakened to lighten the shift operation force, it will be difficult to shift when driving on rough roads. There was a risk of gear slippage due to the inertia of the link mechanism in the control device. Furthermore, if an attempt was made to prevent the gear from slipping out by increasing the spring force, the shift operation would become heavy. Therefore, it has been desired to reliably prevent gear slippage and to reduce the shift operation force.

This idea was made in response to such requests, and involves a shift shaft connected to a gear shift mechanism inside the transmission case that protrudes from the outside of the transmission case, and a shift position that is set on the protrusion of the shift shaft. A check part for selecting the shift position is provided, and a lock member for engaging and disengaging the check part to maintain the shift position is provided opposite to the check part. By providing a gear slippage prevention device that engages and disengages a locking member, the purpose is to reliably prevent gear slippage and reduce shift operation force.

This invention will be explained below based on the drawings.

1 to 3 are diagrams showing a first embodiment of this invention.

First, the configuration will be explained. A gear shift mechanism (not shown) capable of switching between five forward speeds and one reverse speed is incorporated in the transmission case 1 shown in FIG. This gear shift mechanism can change the combination of gear engagement between the input and output shafts in six ways.

A select shaft 2 and a shift shaft 3 are connected to this gear shift mechanism, and both shafts 2,
3 is provided protruding from the outside of the transmission case 1, as shown in FIG. Select shaft 2 is for selecting the gear to engage.
The shift shaft 3 slides and engages selected gears. Both shafts 2 and 3 are connected to a change lever 6 located in the driver's cab via link mechanisms 4 and 5, respectively. Therefore, when the change lever 6 is operated to shift, the select shaft 2 and the shift shaft 3 are rotated and a desired gear is engaged. Here, when a shift operation from a neutral state to 1st, 3rd, or 5th gear is performed, the shift shaft 3 rotates by a certain angle clockwise in FIG. 2, stops, and shifts to 2nd, 4th, or 5th gear. When a reverse shift operation is performed, it rotates by a certain angle counterclockwise in FIG. 2 and then stops.

A check plate 7, which is a check section for selecting a shift position, is provided on a protrusion 3a of the shift shaft 3 that protrudes to the outside of the transmission case 1. As shown in FIG. 2, the check plate 7 consists of two protrusions 7a and 7b extending radially outward from the outer periphery of the shift shaft 3, and a recess 7c is formed between the protrusions 7a and 7b. There is. A lock pin 8, which is a locking member that engages and disengages the check plate 7 to maintain the shift position, faces the check plate 7. This lock pin 8 is attached to a linkage 9 fixed to the outer wall of the transmission case 1.
is associated with the clutch pedal 10 by. As shown in FIG. 2, the linkage 9 includes a substantially cylindrical case 12 which holds the lock pin 8 retractably through a bearing member 11, and a substantially cylindrical case 12 which is provided inside the case 12 and urges the lock pin 8 in the projecting direction. It consists of a spring 15 and an inner wire 14 connected to the lock pin 8 and clutch pedal 10 and inserted through the cable outer 13. By depressing the clutch pedal 10, the lock pin 8 is pulled into the case 12 through the inner wire 14 against the force of the spring 15, as shown by the two-dot chain line in FIG. .

The case 12 is fixed to the outer wall of the transmission case 1 by a bracket 16, and when the transmission gear is in the neutral state, the lock pin 8 is inserted into the recess 7 of the check plate 7.
It is positioned so that it can be engaged with c. Further, when the transmission gear is in the first, third, and fifth speeds, the lock pin 8 comes into contact with the side surface of the protrusion 7a of the check plate 7, as shown in FIG. Since the shift shaft 3 does not rotate further clockwise from this state,
In the abutting state, rotation of the shift shaft 3 is stopped. Furthermore, when the transmission gear is in 2nd gear, 4th gear, or in reverse,
The lock pin 8 comes into contact with the side surface of the protrusion 7a of the check plate 7 to stop the rotation of the shift shaft 3. Stopping the rotation of the shift shaft 3 means maintaining the shift position.

Note that a shaft 10a attached to the clutch pedal 10 is connected to a clutch master cylinder (not shown).

Next, the effect will be explained. Start the engine in the neutral state shown in Figure 2, and set it to 1st, 3rd or 5th gear.
To perform a quick shift operation, first, the clutch pedal 10 is depressed. When the clutch (not shown) is disengaged, the lock pin 8 is pulled into the case 12 by the inner wire 14 as shown by the two-dot chain line in FIG. In this state, the engagement between the recess 7c of the check plate 7 and the lock pin 8 is released. Next, move the change lever 6 to 1st and 3rd gears.
When the shift gear is moved to the 5th or 5th gear side, the shift shaft 3 rotates clockwise by a certain angle together with the check plate 7 as shown in FIG. 3, and the gear shift mechanism inside the transmission case 1 is activated to select The transmission gears mesh. Thereafter, when the clutch pedal 10 is released, the clutch is engaged and the input is transmitted, and the lock pin 8 is pushed out by the spring 15 and comes into contact with the side surface of the protrusion 7a of the check plate 7, as shown by the solid line in FIG.
The shift shaft 3 is fixed. Therefore, the vehicle can be driven with the shift position completely maintained.

On the other hand, the same applies when performing a shift operation to 2nd speed, 4th speed, or reverse.

FIG. 4 is a diagram showing a second embodiment.

In this embodiment, a check part is provided outside the transmission, and the protruding part 3a of the shift shaft 3 is further extended than in the first embodiment, and a check plate 7 is provided at the end of this protruding part 3a. There is. Then, shift shaft 3 and the first
A linkage 9 similar to the embodiment is supported on a vehicle body 17 via brackets 18, 19 and vibration isolating rubber 20.

Since the operation is similar to that of the first embodiment, the explanation will be omitted.

FIG. 5 and FIG. 6 are diagrams showing a third embodiment.

In this embodiment, the linkage 9 and lock pin 8 of the first embodiment are replaced with a hydraulic mechanism 22 and a lock lever 21.

The lock lever 21 has one end bent to form an engaging portion 21a in order to engage and disengage with the check plate 7, and is attached to the wall surface of the transmission case 1 with a bracket 24 with a rotation center 23 in the figure. There is. A hydraulic mechanism 22 is provided at the other end of the lock lever 21. Hydraulic mechanism 22
It is composed of a spring 25 for engaging the lock lever 21 with the check plate 7, and an operating cylinder 26 for disengaging the lock lever 21 and the check plate 7. This spring 25 has one end attached to the lower end of the lock lever 21 in the figure, and the other end attached to a bracket 27 fixed to the outer wall surface of the transmission case 1.
The first engaging portion 21a is urged toward the check plate 7. In addition, operating cylinder 2
6 is attached to the lower end of the lock lever 21 in the figure via a rod 28, and is connected to a master cylinder (not shown) of the clutch pedal 10 via a clutch hose 29. clutch pedal 10
By stepping on the lever, oil is branched from the master cylinder and sent to the operating cylinder 26, pushing out the rod 28 and disengaging the lock lever 21.

Explain the action. To perform a shift operation, the clutch pedal 10 is first depressed. As the clutch is disengaged, oil is pumped from the master cylinder through the clutch hose 29, and the operating cylinder 26 is actuated to push the rod 28 in the direction of arrow A in FIG. Then, the lock lever 21 rotates about the rotation center 23 as shown by the two-dot chain line in FIG. 6, and the engagement with the check plate 7 of the shift shaft 3 is released. next,
When the change lever 6 is operated to engage a predetermined gear, the check plate 7 at the tip of the shift shaft 3 rotates by a certain angle. When the clutch pedal 10 is released, the clutch is connected and the lower end of the lock lever 21 in the figure is pulled by the spring 25, the lock lever 21 rotates and the engaging portion 21a engages with the check plate 7, causing the shift The shaft 3 is fixed. As in the first embodiment, the vehicle can be driven with the shift position completely maintained.

As shown in FIG. 7, a check groove 30 is provided in the shift shaft 3 instead of the check plate 7.
a, 30b, 30c can also be formed. The check grooves 30a, 30b, and 30c are provided at predetermined intervals so that the locking members 8 and 21 engage with each other in accordance with the rotation angle of the shift shaft 3 during a shift operation.

As explained above, according to this idea,
A shift shaft connected to a gear shift mechanism inside the transmission case is provided protruding outside the transmission case, and a check member for selecting a shift position is provided on the protrusion of the shift shaft,
A lock member that engages and disengages the check part and holds the shift position is provided oppositely, and this lock member is connected to the clutch pedal by a linkage or a hydraulic mechanism, so that the gear disengagement is achieved by engaging and disengaging the lock member from the check part by operating the clutch pedal. By providing a prevention device, the engagement between the check part and the lock member at the shift position reliably prevents the gear from slipping out when driving on rough roads, and the gear slipping prevention device can be engaged and disengaged by operating the clutch pedal. Since this is done by the operator and not by operating the change lever as in the conventional case, the effect of reducing the operating force of the change lever can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a transmission case equipped with a gear slippage prevention device and related parts showing the first embodiment of this invention, and Fig. 2 is a perspective view of the transmission case and related parts showing the first embodiment of this invention.
An enlarged view of the main parts of the embodiment, FIG. 3 is an explanatory diagram of the positional relationship between the lock pin and the check plate provided on the shift shaft when a shift operation is performed from the state shown in FIG. 2, and FIG. FIG. 5 is a perspective view similar to FIG. 4 showing the third embodiment of this invention; FIG. 6 is an enlarged view of the main parts of the third embodiment; FIG. 7 is a sectional view showing a shift shaft and a lock member provided with a check groove as a check portion. DESCRIPTION OF SYMBOLS 1... Transmission case, 3... Shift shaft, 3a... Projection part, 7... Check plate (check part), 8... Lock pin (lock member), 9... Linkage, 10... Clutch pedal, 21...Lock lever (lock member),
22...Hydraulic mechanism, 30...Check groove (check portion).

Claims (1)

[Scope of utility model registration request] A shift shaft connected to a gear shift mechanism in the transmission case is provided protruding outside the transmission case, a check part for selecting a shift position is provided on the protrusion of the shift shaft, and a check part for selecting a shift position is provided on the protrusion part of the shift shaft, and the shift shaft is engaged with and disengaged from the check part. A transformer characterized in that locking members for holding a position are provided facing each other, the locking member is associated with a clutch pedal by a linkage or a hydraulic mechanism, and the locking member is engaged and disengaged from the check portion by operating the clutch pedal. Gear slippage prevention device in transmission gear shift control equipment.