JPH0617622Y2 - Automatic transmission shift lock device - Google Patents

Description

[Detailed Description of the Invention] (Industrial field of application) The present invention relates to a shift lock device for an automatic transmission, specifically, a select lever that can be inadvertently moved from a parking position to another range position. The present invention relates to a shift / lock device that does not exist.

(Prior Art) A vehicle equipped with an automatic transmission (hereinafter referred to as "A / T vehicle") has a select lever, a parking range P that mechanically locks a fluid clutch during parking, and a reverse gear that switches to a back gear. Range R, neutral range N that disengages the transmission from the engine, drive range D that automatically shifts over the entire shift range, second shift range
It is selectively located in L or 1 which limits only the gear or between the low and second gears.

Then, in order to prevent the A / T vehicle from running out of control immediately after the engine is started, the engine is started via a safety circuit that can be started only when the select lever is shifted to the parking range or the neutral range. It is supposed to be done.

(Problems to be Solved by the Invention) Normally, in an A / T vehicle which is parked, its select lever is placed in a parking range P (hereinafter referred to as "P position"). And after starting the engine,
The vehicle is started by moving the select lever to the reverse range R (hereinafter referred to as "R position") or the drive range (hereinafter referred to as "D range").

In this case, if you do the position selection operation of the select lever while depressing the brake pedal, there is no problem,
Careless habitual operation of the select lever has occurred. For example, a driver who has a habit of running the engine immediately after starting the engine releases the parking brake without stepping on the brake pedal, and when the engine is running at high speed, the select lever is driven to the R position or the D range. The problem of putting it in the range occurs. In addition, parking without pressing the brake pedal
Even if the brakes are released and the select lever is put in the driving range while the engine is running at high speed like during warm-up, the vehicle will start suddenly. This inadvertent sudden start causes a comparatively large shock, leading to the next erroneous operation of stepping on the accelerator pedal where the brake pedal should be stepped on, causing an accident.

Since such a sudden start of the vehicle also occurs when the engine is started with the select lever in the neutral position, the position of the select lever at the time of engine start was limited to the P position and the brake pedal was depressed. There is also proposed a shift lock device in which the select lever cannot be shifted from the P position unless it is in the state. However, even in this device, there remains a problem that the select lever can be shifted from the P position to another position when the engine is stopped.

(Means for Solving the Problem) The present invention intends to stop the inadvertent sudden start of an A / T vehicle by locking the select lever at the P position even when the engine is stopped. The main point is that, in an automatic transmission that specifies the gear position of the transmission by selecting the position of the select lever, a plurality of ranges in which the detent pin interlocked with the select lever is selectively engaged.・ The detent plate with the position and the above detent pin are detented.
A locking lever that locks the plate in place to prevent it from slipping out of the parking position and an unlocking device that allows the detent pin to slip out of the parking position; The engine stops when it has a spring that gives the rocking habit toward the unlock position, a brake detection switch that detects whether the brake pedal is depressed, and a plunger with one end connected to the lock lever. In the middle, when the select lever selects the parking position and the brake pedal is depressed, a solenoid that drives the lock lever to swing to the lock position,
One end thereof is positioned to be engageable with the other end of the plunger, the other end is connected to the brake pedal via a link, and the plunger is pushed when the brake pedal is not depressed. And an operating mechanism that allows the lock lever to swing toward the unlock position when the brake pedal is depressed. Shift lock device.

The central portion of the actuating mechanism is swingably supported, and one end is positioned so as to be engageable with the other end of the solenoid plunger.
The other end may be a lever that is linked to the brake pedal via a link, and a ball may be interposed between one end of this lever and the other end of the plunger.

(Operation) When the engine is rotating and the select lever is in the P position and the brake pedal is not depressed, the operating mechanism holds the lock lever in the locked position and the detent pin is set to the P position. Prevents you from getting out of position.

When the brake pedal is depressed with the select lever in the P position while the engine is stopped, the solenoid operates to swing the lock lever to the locked position, causing the detent pin to come out of the P position. Prevent the.

When the brake lever is depressed while the select lever is in the P position and the engine is rotating, the actuating mechanism swings the lock lever to the unlock position, and the detent pin moves from the P position. Allow to get out.

(Embodiment) Although the shift lock device of the present invention can be applied to a floor type in which a select lever is provided on the passenger compartment floor, the present invention will be described with reference to an illustrated embodiment applied to a steering column type.

In FIG. 1, a control rod 3 to which a select lever 2 is fixed is attached to a steering column 1 so as to be movable in its axial direction and rotatable about its axis.

As shown in FIG. 2, the base end portion 4a of the detent plate 4 is fixed to the proper position A of the steering column 1. This detent plate 4 has a plurality of range positions, namely "P", "R", "N", "D",
It has "2" and "L" positions. Of the range positions, only the P position is formed at a position independent of the other positions, and is composed of a recess 4d formed by a projection 4b and a tip 4c provided at the boundary with the R position. There is. Detent on the control rod 3
A pin 5 is fixedly mounted, and this detent pin 5 is selectively engaged with one of the range positions of the detent plate 4 corresponding to the range selected by operating the select lever 2. Selected range
The position is detected by a well-known position detection switch that detects the position of the select lever 2, that is, the position of the control rod 3, and is displayed on an indicator panel (not shown).

Further, the base end portion 7a of the bracket 7 is fixed to the steering column 1 adjacent to the detent plate 4,
A support shaft 8 is supported on the tip portion 7b of the bracket 7. Attach the tip 7b of the bracket 7 to the detent plate 4
If the detent pin 5 is moved in the direction of the arrow (see FIG. 2) by bending and fixing it toward the tip of the bracket 7, it is possible to prevent the bracket 7 from being deformed by the load applied to the lock lever 9 described later.

A lock lever 9 is swingably supported on the support shaft 8 at its central portion. One end 9a of the lock lever 9 is P
Extends to a position where the opening of the recess 4d in the position can be closed,
Moreover, it is curved toward the control rod 3 side, and the tip edge 9b thereof is inclined, and the concave portion 4b is formed.
An arc-shaped engaging portion 9d is formed on the side edge facing to.

The other end 9e of the lock lever 9 is connected to one end 11a of a plunger 11 of a solenoid 10. The solenoid 10 is fixed to the steering column 1 via a bracket (not shown). A return spring 12 is wound around one end 11b of the plunger 11, and the return spring 12 is
The plunger 11 is given a movement habit of swinging the lock lever 9 in the counterclockwise direction (unlock position shown in FIG. 3) in FIG. The solenoid 10 is in a state where the engine is stopped, the select lever 2 is in the P position, and
It turns on when the brake pedal is depressed,
The plunger 11 is made to project against the elasticity of the return spring 12. Reference numeral 13 is a brake detection switch, the movable portion of which is abutted against a side edge 14b of the brake pedal 14 which is swung about a shaft 14a, and is turned on when the brake pedal 14 is depressed.

A support shaft 15 is fixed to the steering column 1 via a bracket (not shown), and a lever 16 is swingably supported at the center of the support shaft 15. One end 16a of the lever 16 has a pin 16b engageable with the other end 11b of the plunger 11.
Is fixedly planted, and one end of a rod 17 slidably supported by a guide member (not shown) is connected to the other end 16c of the lever 16 by a pin 18. The other end 17b of the rod 17 abuts the side edge 14b of the brake pedal 14. Therefore, when the brake pedal 14 is not depressed as shown by the solid line in FIG. 2, the rod 17 pushes the lever 16 in the clockwise direction, and the lock lever 9 is locked by the lock lever 9 via the plunger 11. When the brake pedal 14 is swung to the position and the brake pedal 14 is depressed as shown by the broken line, the lock lever 9 is swung to the unlocked position as shown in FIG. The operating mechanism that allows the lock lever 9 to swing to the locked position or the unlocked position is composed of the plunger 11, the lever 16 and the rod 17. It should be noted that the lever 16 and the brake pedal 14 may be interlocked by a cable instead of the rod.

The operation of the embodiment configured as described above will be described. It should be noted that the engine is started via a safety circuit that can be started only when the select lever 2 is shifted to the P position.

FIG. 2 shows a state in which the detent pin 5 is located in the recess 4d in the P position and the lock lever 9 is placed in the lock position. There are two cases in which the lock lever 9 is placed in the locked position. One of them is that the brake pedal 14 is not depressed, so it is locked by the rod 17, lever 16 and plunger 11.
The other is when the lever 9 is swung to the locked position, and the other is when the plunger 11 is swung to the locked position by the plunger 11 under the condition that the solenoid 10 is turned on.

The action of unlocking when starting the vehicle is
Description will be given with reference to the drawings.

First, check the current shift position of the select lever 2. If not in the P position, operate the select lever 2 to move to the P position. In the P position, the engine can be started. Then, it is determined whether or not the engine is stopped. When the engine is not stopped, the process proceeds to N, and it is determined whether or not the brake pedal 14 is depressed by whether or not the brake detection switch 13 is turned on. To do. When the brake detection switch 13 is off, that is, when the brake pedal 14 is not depressed, the lock lever 9 is maintained at the lock position shown in FIG. 2 via the rod 17, the lever 16 and the plunger 11. When the brake detection switch 13 is on, that is, the brake
When the pedal 14 is depressed as shown by the broken line in FIG. 2, the rod 17 follows it and swings the lever 16 as shown by the broken line.

When the lever 16 swings, the plunger 11 is moved by the elasticity of the return spring 12, and the plunger 11
The lock lever 9 connected to is rocked to the unlock position shown in FIG. 3 to unlock. In the unlocked position shown in FIG. 3, the engaging portion 9d of the lock lever 9 is retracted from the recess 4d at the P position, so that the detent pin 5 can be pulled out from the P position.
When the lock is released, after operating the select lever 2 to move the control rod in the direction of arrow a, after removing the detent pin 5 from the P position,
The operation proceeds to the select operation of rotating in the direction of arrow b toward the desired range position. That is, when the engine is rotating, the lock lever 9 is unlocked by depressing the brake pedal 14.

Returning to FIG. 7, if the engine is stopped, proceed to Y to determine whether or not the brake pedal 14 is depressed. If the brake pedal 14 is not depressed, the process proceeds to N and the rod 17, the lever 16 and the plunger 11 put the lock lever 9 in the locked position and maintain it. When the brake detection switch 13 is turned on, that is, when the brake pedal 14 is depressed as shown by the broken line in FIG. 2, the process proceeds to Y, the solenoid 10 is turned on and the plunger 11 is projected to lock the lock pedal. Maintain the lever 9 in the locked position shown in FIG.

That is, as shown in FIG. 2, when the solenoid 10 is turned on or the brake pedal 14 is not depressed, the lock lever 9 is held at the lock position. At the lock position, even if the select lever 2 is operated to move the control rod 3 in the direction of the arrow, the detent pin 5 engages with the engaging portion 9d of the lock lever 9, so that from the P position. I can't get out. Therefore, if the select lever 2 is in the P position and the engine is not started, the select lever 2 cannot be moved even if the brake pedal 14 is depressed. The lever operation of moving the select lever 2 from the P position to another position while depressing the brake pedal 14 while the engine is stopped is not normally performed. However, if such a lever operation is performed and the select lever 2 is placed in a position other than the P position, a person who does not understand how to start the engine of an A / T car or the select lever 2 is in the P position. In the case of a person who operates the engine key without checking whether or not there is, there is a possibility that the engine may not be started because the engine is not started. However, in this embodiment, since the shift lock cannot be released even if the brake pedal 14 is depressed while the engine is stopped, the above misidentification can be prevented.

In addition, as described above, the shift
Since the frequency of locking is low, it is sufficient for the solenoid 10 to have a capacity sufficient to swing the lock lever 9 to the lock position, and therefore a solenoid having a small size and a small capacity is sufficient.

Here, if the lock lever 9 is not placed in the completely locked position shown in FIG. 2 for some reason, for example, as shown in FIG. 5, the lock lever 9 is slightly engaged with the detent pin 5. It was placed in a position where it could fit. In this state, when the control rod 3 is moved in the arrow direction, the detent pin 5 engages with the engaging portion 9d as shown by the broken line. Then, since the engaging portion 9d of the lock lever 9 is arcuate in the detent pin 5, the lock lever 9 is forced to rotate clockwise around the support shaft 8 as shown in FIG. Pivot to move to full lock position. As shown by the solid line in FIG. 6, with the detent pin 5 engaged with the engaging portion 9d of the lock lever 9, the select lever 2 is operated to forcibly pull out the control rod 3 from the P position. If this is done, a large load will be applied to the lock lever 9. However, since this load is applied to the bracket 7 via the support shaft 8, a large load is not applied to the solenoid 10. From this, it will be understood that the solenoid 10 need only be small.

While traveling, the brake detection switch 13 is frequently turned on and off according to the swing of the brake pedal 14, but the detent pin 5 is not brought to the P position, and the engine 10 is rotating. It is kept off.

Next, the operation when the detent pin 5 moves from a position other than the P position to the P position will be described. Normally, the brake pedal 14
After pressing to stop the vehicle, move the select lever 2 to the P position, and then release the pedal pressure on the brake pedal 14. Therefore, when the detent pin 5 is in the P position and the brake pedal 14 is not depressed, the solenoid 10 is turned on,
The lock lever 9 is swung to the lock position shown in FIG. 2 to shift-lock. By the way, at the time of parking, there are cases where the select lever 2 is moved to the P position by operating the parking brake (not shown) while keeping the select lever 2 in the D range position. In this case, since the select lever 2 is operated while the brake pedal 14 is not stepped on, that is, the lock lever 9 is in the lock position as shown in FIG.・ The pin 5 and the tip edge 9b of the lock lever 9 located at the lock position collide with each other, and the detent pin 5 or the select ・
There is a risk that the lever 2 cannot move to the P position.

However, in this embodiment, as shown in FIG.
Since the tip edge 9b of the lock lever 9 is inclined so that the detent pin 5 that abuts against the lock lever 9 is directed toward the recess 4d, the detent pin 5 that can be rotated by the select lever 2 is located in the recess 4d. You can easily enter the P position.

Further, as shown in FIG. 8, since the rotating surface of the lever 16 and the projecting / retracting direction of the plunger 11 of the solenoid 10 are not parallel, one end 16a of the lever 16 causes the other end 1 of the plunger 11 to move.
When pushing down 1b, a large sliding resistance is generated between them, but if steel ball 20 is welded to one end 16a of lever 16 as shown in the figure, one end 16a of lever 16 and the other end 11b of plunger 11 will be formed. Makes a point contact, and the contact point draws a locus 21 shown in FIG. The steel ball 20 can be rotatably supported by the one end 16a of the lever 16,
Further, the other end 11b of the plunger 11 can be welded or rotatably supported.

If the ball 20 is interposed between the one end 16a of the lever 16 and the other end 11b of the plunger 11, both the points can be maintained in point contact even if the centers of the two are slightly deviated. Since the sliding resistance between the two can be reduced, smooth operation and reliability are improved, and the brake pedal 14
You can reduce the force of the brake pedal by reducing the resilience of the return spring.

(Effect of the Invention) As described above, according to the shift lock device of the present invention,
After starting the engine, you can release the lock of the select lever by rocking the lock lever to the unlock position by allowing the detent pin to come out of the parking position by stepping on the brake pedal. When stopped, for example, if you press the brake pedal,
Since the solenoid operates to keep the lock lever at the lock position, the lock state of the select lever is not released. Further, since the solenoid is used less frequently, a small and inexpensive solenoid can be used, and the durability is greatly improved.

[Brief description of drawings]

FIG. 1 is a schematic perspective view showing the periphery of a steering column provided with a shift lock device according to the present invention, and FIG. 2 is a side view showing a locked state of an embodiment of the shift lock device according to the present invention, FIG. 3 is a side view showing an unlocked state, FIG. 4 is a side view showing an example of relative positions of the detent pin and the lock lever, and FIGS. 5 and 6 are automatic lock levers by the detent pin. FIG. 7 is a side view showing a main part for explaining each of the dynamic swings, FIG. 7 is a flowchart showing an operating procedure of the shift lock device, and FIG. 8 is a rear view showing another example of the shift lock device according to the present invention.
FIG. 9 is a view taken along the line IX-IX in FIG. Select lever …… 2, Detent plate ……
4, detent pin …… 5, lock lever …… 9,
Solenoid …… 10, brake detection switch …… 13, brake pedal …… 14, actuating mechanism …… 11, 16, 17, spring …… 12, ball …… 20

Claims (2)

[Scope of utility model registration request] 1. An automatic transmission in which a gear position of a transmission is designated by selecting a position of a select lever, and a plurality of range positions in which a detent pin interlocked with the select lever is selectively engaged. A detent plate that it has and a rocking position that prevents the detent pin from coming out of the parking position of the detent plate and an unlocked position that allows the detent pin to come out of the parking position. A moving lock lever, a spring that gives the lock lever a swinging habit toward the unlock position, a brake detection switch that detects whether or not the brake pedal is depressed, and the lock lever Has a plunger with one end connected to A solenoid for driving the lock lever to swing to the lock position when the select lever selects the parking position and the brake pedal is depressed while the solenoid is stopped, and one end of the solenoid. Is positioned to be engageable with the other end of the plunger, and the other end is connected to the brake pedal via a link, and when the brake pedal is not depressed, the plunger is pushed to move the A shift of an automatic transmission including an operating mechanism that allows the lock lever to swing toward the unlock position when the brake pedal is depressed by swinging the lock lever to the lock position. -Lock device. 2. A center portion of the actuating mechanism is swingably supported, one end of the actuating mechanism is engaged with the other end of the plunger of the solenoid, and the other end of the actuating mechanism is interlocked with a brake pedal via the link. 2. The shift / lock device for an automatic transmission according to claim 1, wherein the shift / lock device comprises a lever formed between the lever and a ball interposed between one end of the lever and the other end of the plunger.