JPS6333690Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an erroneous shift operation prevention device for 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, the shift lever is moved forward. When returning from the position to the neutral position, there is a risk of damaging the transmission gear by erroneously shifting it to the reverse position on the same shift operation line.

Conventionally, as a device for preventing such erroneous operation, for example, a protrusion a connected to a shift lever as shown in FIG.
The lock piece c, which has the engaging pawl b at the tip facing the shift operation locus, is moved from the intermediate neutral position to the reverse side lock position regulated by the stopper d, and the engaging pawl b is located outside the shift operation locus. It is pivotably installed against a spring e to return to the inoperative position on the forward side when it is withdrawn, and when the shift lever is shifted from the forward position to the reverse position, the protrusion a is moved as shown in the second figure. For example, Japanese Patent Publication No. Sho 52-17299 discloses a type that engages with the engaging pawl b and gives the lock piece c a tilting motion toward the lock position that prevents the shift lever from shifting to the reverse position. West German Patent No. 874253
As is known from the specification, in this device, when the protrusion a comes into contact with the outer cam edge f of the engagement pawl b as shown in FIG. In order to provide a tilting motion to the inoperative position that allows the shift lever to be shifted between the forward and reverse positions, the lock piece c is placed on an extension of the selection operation locus of the protrusion a with an axis g orthogonal thereto. In order to generally use a shaft-supported type,
When the device becomes large in the direction of the selection operation trajectory, especially when the device is housed under the transmission case of F and F vehicles, the selection operation trajectory of protrusion a is generally taken in the vertical direction and the device is moved up and down. As the transmission case becomes longer in the direction, the transmission case protrudes downward, resulting in the inconvenience of lowering the minimum ground clearance of the vehicle.
The purpose of the present invention is to provide a device that eliminates such inconveniences, and is capable of moving from a neutral position to a select position on its side, and from the select position to an advanced position on one side and a forward position on the other side. The shift lever 1 includes a shift lever 1 that is shifted to a reverse position, and a plate-shaped lock piece 5 having an engaging pawl 4 at the tip facing the shift operation locus of a protrusion 3 connected to the shift lever 1. The piece 5 is returned by resisting the spring 7 from the intermediate neutral position to the reverse locked position regulated by the stopper 6 and the forward inoperative position where the engaging pawl 4 retreats to the outside of the shift operation locus. When the shift lever 1 is directly shifted from the forward position to the reverse position, the protrusion 3 engages with the engagement pawl 4 and the lock piece 5 causes the shift lever 1 to move backward. In the device configured to be tilted to the lock position to prevent a shift operation to the position, the lock piece 5 is placed in a position perpendicular to a shaft 8 that is erected substantially vertically near the bottom surface of the mission case. The protrusion 3 supported by the shift lever 1 is connected to the shift lever 1 so that its select operation locus is in the vertical direction, and the protrusion 3 is connected to the shift lever 1 by the selection operation of the shift lever 1 to the select position. Engagement claw 4
A top cam surface 3a is formed in contact with the outer cam edge 4a of the lock piece 5 to tilt the shift lever 1 to the inoperative position, which allows the shift lever 1 to be shifted between the forward and reverse positions. .

The devices shown in FIGS. 4 to 7 are those in which the device is housed under the transmission case of a front-wheel drive vehicle that is placed horizontally with respect to the direction of travel of the vehicle. position and the first and second select positions on the left and right thereof, and from the first select position, the forward positions of 1st and 2nd speeds before and after it, and the forward positions of 3rd and 4th speeds before and after the neutral position. Then, each shift operation is performed from the second select position to the 5th speed forward position and the reverse position before and after the second select position. In the drawings, reference numeral 9 indicates a shift shaft in the transmission case connected to the shift lever 1, and the shift shaft 9 is given rotation in accordance with the selection operation of the shift lever 1 and sliding movement in the front and rear direction in accordance with the shift operation. Via the connected first shift arm 10, a second shift arm 13 on a shift piece 12 connected to a shift fork 11 is given vertical sliding motion associated with a select operation and longitudinal rocking motion associated with a shift operation. The protrusion 3 is
For example, as detailed in FIGS. 5 and 6, the second
It is provided protrudingly on the lower surface of the shift arm 13 so that when the shift lever 1 is operated to select, the shift lever 1 is moved to a select operation trajectory in the vertical direction, and when the shift lever 1 is operated, the shift lever 1 is moved to a select operation trajectory in the longitudinal direction. The above is not particularly different from the conventional type described above, but according to the present invention, the lock piece 5 is placed facing the forward/reverse shift operation locus at the bottom of the protrusion 3, and the lock piece 5 is positioned vertically parallel to the select operation locus. The shaft 8 is pivotally supported in a horizontal position, and the vertical length can be significantly shortened compared to the above-mentioned conventional type which is pivotally supported in a vertical position.

According to the downward movement of the projection 3 in conjunction with the selection operation of the shift lever 1 to the second selection position, the cam surface 3a having the slope formed at the lower end of the cam surface 3a is moved to the neutral position as shown in FIG. 7a. Abuts on the engaging claw 4 of the piece 5 at its outer cam edge 4a,
As a result of the further downward movement of the protrusion 3, a clockwise rotational force is applied to the engaging claw 4 by the action of the slope of the cam surface 3a, and as a result, the protrusion 3 is applied to the lock piece 5 as shown in FIG.
The cam edge 4a engages with the shaft 8-side upright surface 3b of the shaft 8, which is tilted to the forward side, that is, to the rear non-operating position. The slope of the cam surface 3a is formed so that the backward direction of the protrusion 3 is lower than the forward direction of the protrusion 3, and the slope further away from the shaft 8 is further downward. In the drawing, reference numeral 14 denotes a support frame that rotatably supports the shaft 8 of the lock piece 5, and a stopper 6 facing the positioning protrusion 15 of the lock piece 5 is provided on the support frame 14.
When the lock piece 5 is tilted from the neutral position to the backward movement side, that is, to the front, the protrusion 15 comes into contact with the stopper 6, and the lock piece 5 moves to the position shown in FIG. 7b.
It is now regulated to the lock position shown in . The return spring 7 of the lock piece 5 is constructed by locking both ends of a coil spring 7 disposed on the outer periphery of the shaft 8 to both ends of protrusions 16 and 17 formed on the lock piece 5 and the support frame 14, respectively. When the lock piece 5 is tilted between the inoperative position and the locked position, the elastic force of the spring 7 is applied between the protrusions 16 and 17 to return the lock piece 5 to the neutral position.

Next, to explain its operation, when the shift lever 1 is selected from the neutral position to the second select position, the protrusion 3 moves downward as described above, and the thrust due to the inclination of the cam surface 3a is applied to the cam edge of the lock piece 5. 4a, the locking piece 5 is tilted to the inoperative position shown in FIG. When the gear is shifted to the 5th speed forward position, the upright surface 3b of the protrusion 3 pushes the cam edge 4a, causing the locking piece 5 to further rotate clockwise, and the engagement pawl 4 moves toward the protrusion 3. move outward from the shift operation locus. Then, upon completion of the shift operation to the 5th speed forward position, the upright surface 3b of the protrusion 3,
Since the position of the side between the cam edges 4a and 4b of the lock piece 5 is moved backward from the position of the side between the cam edges 4a and 4b of the engagement claw 4, the lock piece 5 is returned to the neutral position by the return spring 7. During the return operation from the 5th speed forward position, the second upright surface 3c of the protrusion 3 touches the cam edge 4b of the engagement claw 4.
to rotate the locking piece 5 counterclockwise in the drawing from its neutral position. When the protrusion 3 returns to the lock position shown in FIG. 7b, which corresponds to the second select position, the positioning protrusion 15 of the lock piece 5 comes into contact with the stopper 6, thereby preventing any further shift operation to the reverse position. be done. On the other hand, Fig. 7c
The movement of the projection 3 from the inoperative position shown in FIG. 1 to the backward movement position is not restricted in any way. When the projection 3a is in the reverse position, the lock piece 5 is returned to the neutral position by the spring 7. When the protrusion 3 returns from the reverse position to the neutral position of the shift lever 1, the third upright surface 3d to 3b of the protrusion 3 sequentially abuts the cam edge 4a, and when the shift lever 1 is in the neutral position, the seventh protrusion 3 contacts the cam edge 4a. The result is as shown in Figure c. Therefore, direct operation of the shift lever 1 from the 5th speed forward position to the reverse position is blocked, but once the selection operation in the direction of lifting the protrusion 3 upward is performed at the neutral position, the next selection operation in the upward direction will be performed. It becomes possible to shift to the reverse position.

8 to 10 show other embodiments, in which a shift piece 1 connected to a shift fork 11 is shown.
2 is supported on a shaft 21 so as to be slidable in the left and right direction,
According to the selection operation of the shift lever 1, as the shift shaft 9 rotates, the shift piece 12 is rotated via the pair of swing frames 18 and 19, and the shift lever 1 is rotated.
According to the shift operation, as the shift shaft 9 slides in the front-back direction, the shift piece 12 is given a left-right sliding movement via the swinging piece 20 pivotally supported on the shaft 8, and the shift piece 12 is moved in the left-right direction. The protrusion 3 protruding from the side surface of 12 is allowed to move in the vertical select operation locus and the left and right shift operation locus. Here, the locking piece 5 is supported in a horizontal position by a vertical shaft 8 parallel to the selection operation locus of the protrusion 3, as in the first embodiment, and the engaging pawl 4 at the tip is moved toward the uppermost side. As the protrusion 3 moves upward in response to the selection operation of the shift lever 1 to the second selection position while facing the forward/backward shift operation locus, the cam surface 3a at the top of the protrusion 3 moves upward, causing the outer cam edges 4a and 4b of the engagement pawl 4 to move upward. As the protrusion 3 continues to move upward, the engagement position between the cam surface 3a and the cam edge 4a gradually moves away from the top, and as a result, the lock piece 5 A counterclockwise tilting movement is applied to the inoperative position shown in FIG. 10c, and the shift piece 1
2 is allowed to slide in the left and right direction. According to the shift operation of the shift lever 1 to the 5th speed forward position, the cam 3 moves downward in FIG. 10c and disengages from the engaging pawl 4, so that the engaging pawl 4 is shown in FIG. 10a. It is returned to the position by the spring 7. When the shift lever 1 is subsequently returned from the 5th speed forward position, the upright surface 3b of the protrusion 3 engages with the cam edge 4b of the engagement pawl 4, and the protrusion 15 of the lock piece 5 comes into contact with the stopper 6. After the rotation to the lock position, the subsequent operation is stopped, so that erroneous operation to the reverse position is prevented in the same manner as above. On the other hand, when the shift operation is performed from the reverse position to the neutral position, the upright surface 3c constituted by the curved surface of the protrusion 3
The engaging claw 4 has returned to the position shown in FIG. 10a.
The engaging claw 4 is rotated counterclockwise in the figure to the inoperative position shown in FIG. 10c.

In this way, according to the present invention, the locking piece 5 is supported in a position perpendicular to the shaft 8 which is erected almost vertically near the bottom surface of the transmission case, and the protrusion 3 connected to the shift lever 1 is supported by the selector. Since the protrusion 3 is connected to the shift lever 1 so that the operation locus is in the vertical direction, the lock piece 5 is rotated in the horizontal plane and the lock piece 5 is rotated in the horizontal plane even if the protrusion 3 is connected to the shift lever 1 so that the select operation locus is in the vertical direction inside the transmission case. It is compactly installed without lowering the height above the ground and does not cause damage to the case.The protrusion 3 has a cam on the outside of the engagement pawl 4 of the lock piece 5 by selecting the select position of the shift lever 1. The protrusion 3 is formed with a cam surface 3a at the top that comes into contact with the edge 4a and causes the lock piece 5 to tilt to the inoperative position that allows the shift lever 1 to be shifted between the forward and reverse positions. The engagement between the cam surface 3a of the locking piece 5 and the locking pawl 4 of the locking piece 5 is ensured, and the locking piece 5
It has the advantage that the rotation of the rotor and the prevention of erroneous operations associated with the rotation can be easily achieved without requiring great precision in mounting and assembling the rotor.

[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, Figs. 7 a, b, and c are plan views taken along the - line in Fig. The figure is a perspective view of another embodiment, FIG. 9 is a cutaway side view of the main part thereof, and FIGS. 1...Shift lever, 2...Transmission, 3...Protrusion, 3a...Cam surface, 4...Engaging pawl, 4a...Cam edge, 5...Lock piece, 6...Stopper, 7...
Return spring, 8...shaft.

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 shift of a protrusion 3 connected to the shift lever 1. A plate-shaped lock piece 5 having an engaging pawl 4 at the tip facing the operation trajectory, the lock piece 5
is returned against the spring 7 from the intermediate neutral position to the reverse locked position regulated by the stopper 6 and the forward inoperative position where the engaging pawl 4 retreats to the outside of the shift operation locus. The shaft is installed to be tiltable, and when the shift lever 1 is directly shifted from the forward position to the reverse position, the protrusion 3 engages with the engaging pawl 4 and the lock piece 5 moves the shift lever 1 to the reverse position. The device is configured to be tilted to the lock position to prevent the shift operation of the device,
The locking piece 5 is supported in a position perpendicular to a shaft 8 that stands almost vertically in the vicinity of the lower surface of the transmission case, and the protrusion 3 connected to the shift lever 1 has a select operation locus in the vertical direction. When the protrusion 3 is connected to the shift lever 1 so that the shift lever 1 is moved 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 is moved to the forward position of the shift lever 1. A shift operation prevention device for a vehicle transmission, comprising a top cam surface 3a that tilts to the inoperative position to permit a shift operation to the reverse position and the reverse position.