JPS6123468Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a device for preventing erroneous shift operation of a transmission used in an automobile or other vehicle.

Originally, in a transmission equipped with a shift lever that is selectively operated from a neutral position to a select position on the side thereof, and then shifted from the select position to a forward position on one side and a reverse position on the other side,
When returning the shift lever from the forward position to the neutral position, there is a risk of erroneously shifting the shift lever to the reverse position on the same shift operation line and damaging the transmission gear.

Conventionally, as a device for preventing such erroneous operation, for example, as shown in FIG.
A spring e returns the locking piece c having the lock piece c from the intermediate neutral position to the reverse side lock position regulated by the stopper d and the forward side inoperative position where the engaging pawl b is moved outside the shift operation locus. When the shift lever is shifted from the forward position to the reverse position, the protrusion a engages with the engagement pawl b and engages the lock piece c, as shown in the second figure. A type is known in which the shift lever is tilted to the lock position to prevent the shift operation to the reverse position, and in this case, when the shift lever is operated to select the select position, as shown in the third figure. The protrusion a comes into contact with the outer cam edge f of the engagement pawl b, and the lock piece c is tilted to the stationary position that allows the shift lever to be shifted between the forward and reverse positions, and the shift operation is performed. When the protrusion a is released from the engaging pawl b, the lock piece c returns to the neutral position by the return spring e and is ready for the return operation from the forward position. In this case, the return spring e is a pair of locking pieces c to be indexed to the forward and reverse sides, and the locking piece c is adjusted by the balance between both springs e and e.
This is a general formula for holding the lock piece c in a neutral position, and when doing so, the lock piece c is held at a predetermined neutral position by hysteresis due to friction acting on the lock piece c and changes in the elastic force of each spring e. If the position shifts toward the forward side, the protrusion a will not be engaged with the engaging pawl b when returning from the forward position, and erroneous operation to the reverse position may not be prevented. If the position shifts to the reverse side, the protrusion a will engage with the engagement pawl b during the shift operation to the reverse position following the select operation, resulting in inconveniences such as making the shift operation to the reverse position impossible.

The object of the present invention is to provide a device that eliminates such inconveniences, and is capable of being selectively operated from a neutral position to a select position on the side thereof, and from the select position to a forward position on one side and a reverse position on the other side. Shift lever 1 that is operated to shift to the position
and a lock piece 5 having an engaging pawl 4 at the tip facing the shift operation trajectory of the protrusion 3 connected to the shift lever 1, and the lock piece 5 is moved from an intermediate neutral position by a stopper 6 The shift lever 1 is pivotably installed to be tiltable against a spring 7 to return the engaging pawl 4 to a locked position on the reverse side where it is regulated and an inoperative position on the forward side where the engaging claw 4 is moved outside the shift operation locus. When the shift lever 1 is shifted from the forward position to the reverse position, the protrusion 3 engages with the engaging pawl 4 and the lock piece 5 is moved to the lock position to prevent the shift lever 1 from being shifted to the reverse position. When the shift lever 1 is tilted to the select position, the protrusion 3 comes into contact with the outer cam edge 4a of the engagement pawl 4, and the lock piece 5 engages the shift lever. In the case where the return spring 7 is configured to be tilted to the inoperative position that allows a shift operation between the forward movement position and the reverse movement position of the lock piece 5, A fixed projecting piece 8 and a spring receiver 10 fixed to the machine frame 9 are pressed against each other from both sides, and the locking piece 5 is positioned at a neutral position determined by the spring receiver 10.

The shift lever 1 is selectively operated, for example, as shown in the fourth figure, between an intermediate neutral position and first and second select positions to the left and right of the neutral position, and from the first select position to forward positions of first and second gears before and after the first select position. Shift operations are performed from the neutral position to 3rd and 4th speed forward positions, and from the second select position to 5th speed forward positions and reverse positions.

In the drawings, reference numeral 11 indicates a shift shaft in the transmission case connected to the shift lever 1, and the shift shaft 11 is given rotation in response to the selection operation of the shift lever 1 and sliding in the front and rear direction in response to the shift operation. Shift bead 1 connected to shift fork 13 via first shift arm 12 connected to this
The second cyst arm 15 on the upper part 4 is given a vertical sliding motion associated with a select operation and a longitudinal rocking motion associated with a shift operation. The protrusion 3 is connected to the second cyst arm 15, as detailed in FIGS. 5 and 6, for example.
It is arranged so that it protrudes from the lower surface of the shift lever 1, so that when the shift lever 1 is selected, the shift lever 1 is moved along a select operation trajectory in the vertical direction, and when the shift lever 1 is operated, the shift lever 1 is moved along a shift operation trajectory in the longitudinal direction.

The locking piece 5 supports the engaging pawl 4 in a horizontal position by a shaft 16 on the machine frame 9 with the engaging pawl 4 facing the forward and backward shift operation locus at the lowest side of the protrusion 3. 2. When the protrusion 3 moves downward with the selection operation to the select position, the cam surface 3a consisting of the slope formed at the lower end of the protrusion 3 moves toward the outer cam edge 4 of the engagement claw 4.
a, so that the locking piece 5 is tilted to the forward side, that is, to the rear inactive position, as shown in FIG. 7c.

In the drawing, reference numeral 17 denotes a positioning piece formed on the lock piece 5. When the lock piece 5 is moved backward, that is, tilted forward, the positioning piece 17 comes into contact with the stopper 6 formed integrally with the machine frame 9. The lock piece 5 is shown in Fig. 7b.
It is now regulated to the lock position shown in the figure.

The return spring 7 is constituted by a coil spring disposed around the outer periphery of the shaft 16 of the lock piece 5, and when the both ends thereof are in the neutral position of the lock piece 5 shown in FIG. 8 and a spring receiving piece 10 formed on the machine frame 9, and when the lock piece 5 is tilted from the neutral position, the return spring 7 engages with the side edge of the protruding piece 8 in the rotating direction. The elastic force of the spring 7 acts on the lock piece 5 through the end of the lock piece 5,
The locking piece 5 is rotated back so that the end portion is brought into pressure contact with the spring receiving piece 10, so that it is surely returned to a predetermined neutral position where this elastic force can be received.

The return spring 7 may be constructed, for example, by a plate spring having both ends pressed against both edges of the protruding piece 8 and the spring receiving piece 10 as shown in FIG. are pressed against both sides of the projecting piece 8 and the spring receiving piece 10, and as the locking piece 5 tilts from the neutral position, compression of each spring 7 causes the locking piece 5 to return to the neutral position. It may be possible to provide reinstatement.

Next, to explain its operation, shift lever 1
According to the selection operation to the second selection position, the protrusion 3 moves downward along the selection operation locus, and the locking piece 5 in the neutral position tilts to the non-operating position as described above against the return spring 7. , the protrusion 3 is allowed to move backward or forward in the shift operation trajectory in response to a shift operation from the second select position to the fifth speed forward position or the reverse position.

Then, when the protrusion 3 is disengaged to the rear of the engagement pawl 4 due to the shift operation to the 5th speed forward position, the locking piece 5
is returned to the neutral position by the return spring 7, and during the return operation from the 5th speed forward position, the lock piece 5 is tilted to the lock position by the engagement of the protrusion 3 with the engaging pawl 4, and the gear is tilted to the reverse position. The shift operation is blocked, and when the operation returns to the neutral position, the protrusion 3 engages the engagement pawl 4.
When the lock piece 5 is released above, the return spring 7 returns the lock piece 5 to the neutral position again in preparation for the next selection operation.

As described above, according to the present invention, the return spring 7 is brought into pressure contact with the protrusion 8 formed on the lock piece 5 and the spring receiving piece 10 of the machine frame 9 from both sides at the neutral position of the lock piece 5. Since it is positioned at the neutral position determined by the lock piece 10, even if the lock piece 5 is slightly tilted from the neutral position, the elastic force of the spring 7 acts on the protruding piece 8, and the elastic force is transferred to the spring receiving piece. 1
The locking piece 5 is reliably returned to the predetermined neutral position that it receives at 0, and has the effect of reliably resolving the above-mentioned disadvantages of the conventional type that returns to the neutral position by balancing the elastic force of a pair of springs. .

[Brief explanation of the drawing]

1 to 3 are side views illustrating the operation of the conventional device, and FIG. 4 is a perspective view of an example of the device of the present invention.
Fig. 5 is a cutaway front view of the main part, Fig. 6 is a side view taken along the - line in Fig. 5, Fig. 7 abc is a plan view taken along the - line in Fig. 5 explaining its operation, and Fig. 8 is a plan view taken along the - line in Fig. 5. FIG. 9 is a perspective view of the main parts showing an embodiment, and FIG. 9 is a plan view of the main parts showing still another embodiment. DESCRIPTION OF SYMBOLS 1... Shift lever, 2... Transmission, 3... Protrusion, 4... Engaging pawl, 4a... Cam edge, 5... Lock piece, 6... Stopper, 7... Return spring, 8... …
Projection piece, 9...Machine frame, 10...Spring receiving piece.

Claims (1)

[Scope of utility model registration request] A shift lever 1 that is selectively operated from a neutral position to a select position on its side and shifted from the select position to a forward position on one side and a reverse position on the other side, and a protrusion connected to the shift lever 1. A lock piece 5 having an engaging pawl 4 at the tip facing the shift operation locus of No. 3, the lock piece 5
is tilted against the spring 7 from the intermediate neutral position back to the reverse side lock position regulated by the stopper 6 and the forward side inoperative position where the engaging pawl 4 is moved outside the shift operation locus. When the shift lever 1 is shifted from the forward position to the reverse position, the protrusion 3 engages the engagement pawl 4 and the lock piece 5 moves the shift lever 1 to the reverse position. When the shift lever 1 is operated to the select position, the protrusion 3 is moved to the engagement pawl 4.
The locking piece 5 is tilted to the inoperative position which allows the shift lever 1 to be shifted between the forward and reverse positions by contacting the outer cam edge 4a of the shift lever 1. At the neutral position of the lock piece 5, the return spring 7 is brought into pressure contact with the protruding piece 8 fixed to the lock piece 5 and the spring receiving piece 10 fixed to the machine frame 9 from both sides, and the lock piece 5 is pressed against the spring receiving piece 10 fixed to the machine frame 9. A shift operation prevention device for a vehicle transmission, which is positioned at a neutral position determined by 10.