JPS58203530A - Shifting mechanism of automatic transmission for car - Google Patents

Abstract

PURPOSE:To interrupt smooth change to a back position even if a knob is operated and to reduce the load to the driver, by providing the titled speed change gear with a shift range controlling mechanism by which the shift range is limited to a running position in a shiftable range when the knob is pushed at the running position. CONSTITUTION:The lever 14 of a shifting mechanism is constituted by a hollow pipe 14-A and a press forming member 14-B, a vertically slidable push rod 42 is stored in the inside of the hollow pipe 14-A, a slide pin is engaged with the lod 42, and a roll 44 is fitted to the upper end. A knob 52 having a cam surface 50 is fitted to the inside of a knob 46 attached to the upper end of the lever 14 so as to be turned to the external by a spring 54. When the knob 52 is pushed, the pin 32 is falls and a one-way cam is turned to the counterclockwise direction, so that the level 14 can be moved to any position out of the 1st speed, back and parking positions. Once any position out of the lst 3rd running positions is shifted, the cam 36 is returned to the original position by a winding spring. If the knob 52 is pressed under said condition, it is prevented to shift to the neutral, back or parking position exceeding the 3rd speed position.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a shift mechanism for an automatic transmission for a vehicle.

Not only automatic transmissions but also vehicle gear shift mechanisms are normally equipped with various erroneous operation prevention mechanisms to prevent them from accidentally entering the reverse position while driving, and these erroneous operation prevention mechanisms are currently limited. has achieved results.

It is undesirable from the perspective of reducing driver fatigue to force the driver to make unreasonable movements by extremely strengthening the function to prevent erroneous operation, and currently, while satisfying the condition of ease of use, it is difficult for the driver to accidentally move into the reverse position. Some efforts are being made to moderate gear shifting operations, or to add one extra action to avoid having to choose between the two.

By the way, the general method for preventing erroneous operation in automatic transmissions is to move the lever while pressing the knob □ when selecting the reverse position, but if the driver mistakenly presses the knob while driving at high speed. There is a possibility that it will move into the retreat position and swerve.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a soft mechanism for a vehicle automatic transmission that is difficult to move into the reverse position even when the conventional operating knob is operated without being pushed or pushed.

Still another object of the present invention is to provide a shift mechanism for an automatic transmission for a vehicle that can be easily operated from a reverse position to a forward position in the same way as conventional ones, and does not place a burden on the driver. There is something to do.

Another object of the present invention is to provide a shift mechanism for an automatic transmission for a vehicle in which the shift operation from a neutral position to a reverse position can be performed easily in the same manner as conventional systems, and does not place a burden on the driver. is to provide.

A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a side view of a shift mechanism according to the present invention, and FIG. 2 is a sectional view taken along line 2-2m in FIG.

In FIG. 1, the shift mechanism 10 is attached to the vehicle body (not shown) in the driver's seat with bolts 12, and by manually moving the lever 14 around the pivot 16, the output terminal 1
8f: It is moved from side to side in the figure, and the manual valve of the automatic transmission is operated via a cable (not shown) secured to this terminal 18 to perform a gear change operation.

Six cams 22-L are provided on the bracket 20 collinear with the bolt 12 to provide moderation of speed change.

21-2, 22-T, 22-N, 22-4° 22-P are formed together with the reinforcing plate 21, and these cams have a cam follower 24 that can freely rotate around a pivot 26 with respect to the lever 14. It is attached to.

A spring 28 shown by a chain line in the figure is interposed between the cam follower 24 and the lever 14, and presses the cam follower 24 against the cam groove to produce the speed change moderation.

Cam follower 24 and cam 22-L, 22-2゜22-T
, 22-N, 22=PL, and 22-P, when the cam follower 24 is in the cam groove of each cam, 1st speed (low), 2nd speed (second), 3rd speed (top), It is determined that the manual valve corresponds to neutral (neutral), reverse, and parking.

A window 30 with a complicated shape is provided in the center of the bracket 20, and a slide pin 32 protruding from the lever 14 is fitted into this window 30, thereby determining the allowable rotation range of the lever 14. .

A guide groove 34 is also provided on the lever 14 side to guide the slide bin 32.

Further, a one-way cam 36 is attached to the bracket 20 so as to be rotatable around a pivot 68, and a helical spring 4 is attached to the bracket 20.
0, a light torque is applied 4 in the clockwise direction in the drawing, and the reinforcing plate 21 is set at the shown position in contact with the reinforcing plate 21.

The lever 14 is a hollow pipe 14- as shown in FIG.
It is made up of a combination of A and press forming member 14-B, and houses a bushing rod 42 that is vertically slidable inside.

A lower end of the dash rod 42 engages with the slide pin 32, and a roller 44 is provided at the upper end.

A hole 48 is provided in the interior of the knob 46 attached to the upper end of the lever 14 in the lateral direction, and a cam surface 5 is inserted into the hole 48.
A knob 52 having a value of 0 is attached and urged outward by a spring 54.

As shown in Figure 2, when the knob 52 is pushed in, the cam 5
As the roller 44 rotates and the bushing rod 42 is pushed down, the slide bin 32 moves down within the window 64. Conversely, when the knob 52 is released, the knob itself is released by the spring 54.
It is moved outward by the push rod) -42H and lifted to -F by the lower return spring 56, and returns to the position shown.

Next, the operation of the present shift mechanism 10 will be explained.

The position of the lever 14 in FIG. 1 is the neutral position, and if the knob 52 is not pressed for the slide bin 32, the lever 14 can freely move to the three shift positions of neutral, third gear, and second gear. However, it will not shift to any other gear position.

When the knob 52 is pushed from the position shown in the figure, the slide bin 32 descends and the one-way cam 36 is turned in the direction of the counterclockwise cutting force in the figure. Can move.

However, after shifting to the old forward position, 1st speed, 2nd speed, or 3rd speed, the one-way cam 36 is activated by the helical spring 4.
0 returns to the position shown in the figure, so as long as the knob 52 is pressed, the vehicle will not go beyond the third gear position and enter the neutral, reverse, or parking position.

Therefore, regardless of whether the knob 52 is pressed or not, the vehicle does not go from the forward position to the backward position 1. Release the knob 52, bring it to the neutral position, and then turn the knob 52. Pushing is a prerequisite for shifting into reverse or park. This further reduces the probability that the vehicle will be erroneously shifted to the reverse position while driving.

On the other hand, moving from the neutral position to the reverse position or to the parking position can be done in exactly the same way as before, and furthermore, moving from the parking position or the reverse position to the forward position is easy because it only needs to be done in the same way as before. .

Further, according to the present invention, the provision of the one-way cam 36 can virtually completely prevent erroneous operation, so the mechanism is simple, can be manufactured at low cost, and is highly reliable. Furthermore, when using it, the purpose can be fully achieved with only a light burden placed on the driver.

Next, a modified embodiment of the present invention will be described with reference to FIG.

FIG. 3 is a side view of the main parts of the shift mechanism according to the modified embodiment.

The difference between this modified embodiment and the first embodiment is that the one-way cam 136 is fixed to the bracket 120.

Therefore, in this modified embodiment, the position changes from the forward position to the backward position.
When shifting to the parking position, the cam 136 moves toward the window 130 regardless of the state of the knob, as in the first embodiment.
The operation is blocked by the stopper provided at .

However, when shifting from the reverse position or parking position to the forward position, by pressing the knob, the slide pin 132 rides on the one-way cam 136, and the driver applies the reaction force of pushing the knob back to the finger. The shift is made as you feel it. Of course, when shifting from the reverse position to the forward position, as long as you do not press the knob, you can shift with exactly the same operational feeling as conventional models.

In this modified embodiment, when shifting to the forward position while pushing the knob, a kind of soft sensation is newly imparted in which the knob is pushed once and then returned.

In the above embodiment, the knob is located next to the knob, but the knob may be arranged below the knob so that when the knob is grasped, the knob is pulled up together with the knob.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a side view of the shift mechanism, FIG. 2 is a sectional view taken along the line 2-2 in FIG. 1, and FIG. 3 is a main part of the shift mechanism according to a modified embodiment. FIG. In the drawings, 10 is a shift mechanism, 14 is a lever, -524 is a cam follower, 62 is a slide pin, 36 is a one-way cam, 42 is a bushing rod, and 52 is a knob. Patent applicant: Honda Motor Co., Ltd. Agent: Patent attorney Yo Shimoda Patent attorney: Kunihiko Ohashi

Claims (4)

[Claims] (1) In a shift mechanism for an automatic transmission that requires a knob to be pressed when shifting from a neutral position or forward position to a reverse position, the range in which the shift can be made is limited when the knob is pressed in the forward position. A shift mechanism for an automatic transmission for a vehicle, comprising a shift range limiting mechanism that is limited to a forward position. (2) The shift mechanism for an automatic transmission for a vehicle as described in the patent, wherein the shift range limiting mechanism is provided with a one-way function that allows shifting from a shift position other than the forward position to the forward position while pressing the knob. (3) The shift mechanism is provided with a pin on the movable side that changes its position in conjunction with the knob, and a blocking body that limits the movement of the pin in the 77 direction corresponding to the state in which the knob is pressed to the forward position. The automatic transmission for a vehicle according to claim 1, wherein the blocking body is provided on a fixed side and is held in a first position where it exerts a blocking force by the force of an elastic body. Machine shift mechanism. (4) When the 1kl is shifted from a shift position other than the forward position to the forward position by pushing the knob, the pin acts against the force of the elastic body to move the blocking body to a second position that cannot exert a blocking force. 4. The shift mechanism for an automatic transmission for a vehicle according to claim 3, wherein the shift mechanism is configured to move to a position to allow the pin to pass.