JPS6246586Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a transmission for use in an automobile.

Switching between forward and reverse driving modes in an automobile is performed by changing gears in the transmission, both in manual vehicles that use a gear train as a transmission, and in automatic transmission vehicles that use a torque converter as a transmission. However, if this gear change is performed before the vehicle has come to a complete stop, a large impact will be applied to the power transmission system. for example,
If you operate the shift lever to change the gear to the reverse position while the vehicle is driving forward, or if you change the gear to the forward position while the vehicle is reversing, the gears in the transmission may be violently collided and damaged. , which will give a large impact to the power transmission system.

This idea was made in view of the above circumstances, and is a vehicle with a function that automatically locks the forward and reverse shifts of the transmission when the vehicle is running, and releases the lock when the vehicle stops. The purpose of this invention is to provide a transmission for

Corresponding to this purpose, the vehicle transmission of the present invention has a speedometer that detects the vehicle speed of the vehicle, and a switching valve of an actuator that switches according to the signal of the speedometer, and the vehicle speed signal is detected by the speedometer. The present invention is characterized by comprising a shift lock mechanism that locks the transmission control rod from shifting from a traveling position to a reverse traveling position by switching the switching valve and operating the actuator when the transmission control rod is in a state where the transmission control rod is in the opposite direction. .

In Japanese Utility Model Application Publication No. 56-1826, the present applicant has proposed a device for supporting the power transmission system of a vehicle having a multiple transmission and capable of switching between front wheel drive and non-drive.

Hereinafter, the details of this invention will be explained with reference to the drawings showing one embodiment.

1 and 2, reference numeral 1 indicates a shift lock mechanism in a vehicle transmission. The shift lock mechanism 1 includes a transmission control rod 2. This transmission
The control rod 2 is connected to a shift lever (not shown) to be manually operated, and is in a mutual motion transmission relationship with the shift lever. A guide plate 3 is attached to the transmission control rod 2, and this guide plate 3 is attached to the transmission control rod 2.
By axially displacing the rod 2, a forward position F, a neutral position N and a retracted position R can be assumed.

Transmission control rod 2
A control lock shaft 4 is disposed along the line. The control lock shaft 4 is axially displaceable and is supported near both ends by bearings 5, which are covered by covers 6, 7.

Lock plates 8 and 9 are attached to the control lock shaft 4 at intervals of a shift amount between a forward position F and a neutral position N or a shift amount between a neutral position N and a reverse position R, forward position, respectively.
It can take a neutral position and a retreat position.
Lock plates 8 and 9 are transmission
Due to the axial displacement of control rod 2,
It is located at a position where it comes into contact with the guide plate 3. The axial displacement of the control lock shaft 4 is regulated by a control lock lever 11. The control rod lever 11 is rotatably supported by a lever bracket 12 via a shaft 13, and is rotationally driven by an air cylinder 14 which is an actuator. By its rotation, the control lock lever 11 is brought into contact with the lock plate 8 or 9 and into a position where it is in contact with the lock plate 8 or 9 to restrain the axial displacement of the control lock shaft 4. The control lock shaft 4 can be moved between a position in which the control lock shaft 4 is not in contact and, therefore, the axial displacement of the control lock shaft 4 is not restrained.

The air cylinder 14 is operated or stopped depending on a signal indicating whether or not the vehicle is running. That is, as shown in FIG. 3, the analog signal of the speedometer 16 is converted into a digital signal by the pulse transmitter 17, and then input to the switching valve 21 via the control circuit 18 to control the switching valve 21. , air tank 22
Air is supplied and discharged from the air cylinder 14 to the air cylinder 14.
Control ON/OFF, or switch the air supply/discharge path as necessary.

The control circuit 18 can be configured, for example, as shown in FIG.
It is operated at the timing shown in the figure.

The operation of the shift lock mechanism constructed in this way is as follows.

When the vehicle is running, the speedometer 1
6 is detected, and in response to the signal, the air cylinder 14 is actuated to rotate the control lock lever 11 and displace it to a position where it comes into contact with the lock plate 9. This locks the control lock shaft 4 and restricts its axial displacement. Transmission control
When rod 2 is in forward position F, guide plate 3 is between lock plates 8 and 9 of locked control lock shaft 4, so transmission control rod 2 is moved from forward position F. It is possible to coast to the neutral position N, but it is not possible to move to the reverse position R. However, the vehicle stopped and the speedometer showed this at 16.
is detected, and based on the signal, the switching valve 21 switches, the air cylinder 14 reverses, and the control lock lever 11 is reversed to disengage from the engagement position with the control lock shaft 4. , the control lock shaft 4 is released from restraint and is free to move in the axial direction. The transmission control rod 2 can therefore be moved to the retraction position R.

Transmission control rod 2
Similarly, switching from reverse position R to forward position F is also prevented while the vehicle is traveling backwards.
Allowed only while the vehicle is stationary.

As is clear from the above explanation, this invention has a function that automatically locks the forward and reverse shifts of the transmission when the vehicle is running, and releases the lock when the vehicle stops, thereby transmitting power. It is possible to obtain a vehicle transmission that can avoid system shocks and the like.

[Brief explanation of the drawing]

FIG. 1 is a configuration explanatory diagram showing the shift lock mechanism;
Fig. 2 is a front view showing the control lock lever, Fig. 3 is a configuration explanatory diagram showing the vehicle running detection system, Fig. 4 is a block diagram showing the control circuit, and Fig. 5 is the operation timing of the shift lock mechanism. FIG. 1...Shiftro mechanism, 2...Transmission control rod, 4...Control lock shaft, 11...Control
Lock lever, 14...Air cylinder, 1
6...Speedometer, 18...Control circuit, 21...Switching valve.

Claims (1)

[Claims for Utility Model Registration] (1) A vehicle having a speedometer that detects the speed of the vehicle, and a switching valve of an actuator that switches according to the signal of the speedometer, and in a state where the vehicle speed signal is detected by the speedometer. A vehicle transmission characterized in that it is equipped with a shift lock mechanism that locks the shift of a transmission control rod from a traveling position to a reverse traveling position by switching the switching valve and operating the actuator. (2) The shift lock mechanism includes a control lock shaft that is in a mutual movement restraint relationship with the transmission control rod, and a position between a position where the movement of the control lock shaft is restrained and a position where the movement of the control lock shaft is released. A control lock lever that is movable to the left, an air cylinder that drives the control lock lever, and a control device that detects the running of the vehicle and controls the operation of the air cylinder. A vehicle transmission according to claim 1 of the utility model registration claim, characterized in that: