JP5839918B2 - Automatic transmission reverse shift limiting device - Google Patents

Description

The present invention relates to a reverse shift limiting device for an automatic transmission, and more particularly to a device for limiting a shift operation from N (or forward range) to R range.

In general, automatic transmissions (including continuously variable transmissions) can be switched in order to each range such as P (parking), R (reverse), N (neutral), and D (drive) by operating a shift lever. . In the P range, the engine key is turned from the LOCK position to the ACC position and thereafter, and the knob button provided on the shift lever is pressed (select operation in the gate type), and the brake pedal is depressed, and the shift to the R range is possible.

On the other hand, the N (or D) → R shift is different from the P → R shift, and can be operated by simply pressing a knob button provided on the shift lever. That is, the N → R shift is possible regardless of the brake operation. Therefore, if the accelerator pedal is depressed by mistake with the brake pedal during the N → R shift, there is a possibility that the vehicle starts suddenly in the R state.

Patent Document 1 discloses a mechanical shift lock device. This shift lock device is provided with a detent pin that interlocks with a knob button provided on the shift lever, and a rotatable shift lock cam that restricts the movement of the detent pin, and the shift lock cam has one end of a shift interlock cable. Are connected. A slide member is connected to the other end portion of the shift interlock cable, and a lock pin is orthogonally engaged with the first locking portion of the slide member in a state where the brake pedal is not depressed. When the key is turned from the ACC position to the LOCK position, the key interlock cable moves, and the key interlock member connected to the end of the cable engages with the second locking portion of the slide member. . As a result, by depressing the brake pedal and turning the key to the ACC position, the lock is released and shifting from the P range to another range becomes possible.

Patent Document 2 discloses a shift lever device in which a shift lock member for a parking range and a neutral range is provided so as to be interlocked, and the shift lock member is operated by a solenoid.

In the case of a mechanical shift lock device such as Patent Document 1, since the shift lock cam and the detent pin are not engaged except in the P range, the brake pedal is depressed when attempting to shift from the N (or forward range) to the R range. You can shift by simply pressing the knob button. Therefore, when the accelerator pedal is depressed by mistake with the brake pedal, sudden start in the R state cannot be prevented.

In the case of the electric shift lock device as in Patent Document 2, the shift lock from the N range to the R range is possible only by changing the program. There is a concern that malfunction of the solenoid may cause malfunction of the solenoid.

JP-A-8-188062 Japanese Utility Model Publication No.4-111962

SUMMARY OF THE INVENTION An object of the present invention is to provide a mechanical reverse shift limiting device capable of preventing an R state when an accelerator pedal is depressed by mistake in a brake pedal in N (or forward range) → R shift. .

In order to achieve the above object, the present invention is capable of switching to each of the ranges of at least P-R-N-D in sequence, a shift lever provided with a knob button on the operation knob, and in conjunction with the knob button of the shift lever. A guide pin that moves in the axial direction of the shift lever, a guide window that is formed corresponding to the position of each range and that can be engaged with the guide pin, contacts the guide pin, and locks the guide pin at the P position. A shift lock cam that can be rotated to lock the shift lever in the P position, a shift lock cable having one end connected to the shift lock cam, and the other end of the shift lock cable. A slide lock member provided so as to be slidable, and a brake interlocking member that moves in conjunction with depression of the brake pedal. In the automatic transmission, in which the brake interlocking member locks the first locking surface of the slide lock member and restrains the operation of the shift lock cable when the treble is at the P position and the brake pedal is not depressed. The lock cam is provided with a contact portion that contacts the guide pin when the shift lever is at the N position and the knob button is operated, and the shift lever is at the N position and the brake pedal is not depressed on the slide lock member. A second locking surface for engaging with the brake interlocking member is provided, and when the shift lever is operated from the N position to the R position while operating the knob button in a state where the brake pedal is not depressed, The brake interlocking member locks the second locking surface to lock the shift lock cam, and the guide When the shift lever is operated from the N position to the R position while operating the knob button with the brake pedal depressed, the movement of the switch to the R position is restricted by the contact portion of the shift lock cam. The engagement of the brake interlocking member and the second locking surface is released, the shift lock cam is brought into the unlocked state, and the guide pin can be shifted to the R position by pressing the contact portion of the shift lock cam. A reverse shift limiting device is provided.

In the P range, it is possible to shift to the R range for the first time by depressing the brake pedal and pressing a knob button provided on the shift lever, as in the prior art. That is, the shift lever cannot be shifted from the P range to another range without stepping on the brake pedal. On the other hand, even in the N range, the shift to the R range is possible only when the shift lever is operated in the N → R direction while operating the knob button while the brake pedal is depressed. That is, since it is not possible to shift to the R range without depressing the brake pedal, the N range is maintained even if the accelerator pedal is depressed by mistake with the brake pedal simultaneously with the N → R shift operation, and sudden start can be prevented.

In the above description, the key interlock mechanism is omitted, but it goes without saying that the key interlock mechanism can be added to the present invention. That is, a key interlock member connected to a key device via a key interlock cable is slidably provided on a fixing member (for example, a housing), and a key is inserted into a key cylinder and turned from a LOCK position to an ACC position. The key interlock member may release the lock of the slide lock member and shift from the P range to another range.

The N → R shift in the present invention includes a shift from the forward range such as D or L to the R range. The reason for this is that there is an N range between the forward range and the R range, as in P-RND, so when the forward range is changed to the R shift, the N range must be passed along the way. Because it does.

As described above, according to the present invention, it is possible to shift from the N (or forward gear) to the R range only when the brake pedal is depressed. Therefore, even if the accelerator pedal is depressed incorrectly, the R state A sudden start at can be prevented. The present invention also provides a brake for an N → R shift by simply changing the shape of a part of an existing mechanical shift lock device (addition of a contact portion of a shift lock cam and a second locking surface of a slide lock member). Since the pedal depression condition can be set, the N → R shift lock can be realized without adding new parts.

It is a side view of an example of the shift mechanism provided with the reverse shift limiting device concerning the present invention. It is P range of an example of the shift lock apparatus concerning the present invention, a transverse cross section at the time of brake OFF, and an AA line sectional view. FIG. 3 is a cross-sectional view of the shift lock device shown in FIG. It is an enlarged side view of the shift lever mechanism in the N range. It is an enlarged side view of the shift lever mechanism in the middle of N-> R shift. It is an enlarged side view of the shift lever mechanism in the R range. It is an operation | movement figure of the shift lock apparatus at the time of the brake OFF / ON in N range.

Hereinafter, a reverse shift limiting device according to the present invention will be described with reference to the drawings.

First, a shift mechanism to which the reverse shift limiting device of the present invention is applied will be described. FIG. 1 shows an example of a schematic structure of a shift mechanism of an automatic transmission. This shift mechanism is an example of a floor shift type, and the shift lever 1 is attached to the vehicle body 5 so as to be rotatable in the longitudinal direction of the vehicle body about the support shaft 6. Note that the present invention is not limited to the floor shift type and can be similarly applied to a column shift type. The operation knob 2 of the shift lever 1 is provided with a knob button 3 that can be operated with a finger. A guide pin 4 that is movable in the axial direction of the shift lever 1 protrudes laterally from the long hole 1a (see FIG. 4) in the middle portion of the shift lever 1, and the guide pin 4 is moved downward by pushing the knob button 3. Can be moved to. The guide pin 4 is always urged upward by a spring (not shown) built in the shift lever 1. In this embodiment, the cross-sectional shape of the tip portion of the guide pin 4 is a square, but it may be a circle.

A guide plate 7 is fixed on the vehicle body 5 on the side of the shift lever 1, and a guide window 8 having an uneven portion corresponding to the shift position is formed on the guide plate 7. The guide pin 4 of the shift lever 1 is inserted into the guide window 8, and P (parking), R (reverse), N (neutral), D (drive), It is possible to sequentially switch to each range position of 2 (second) and L (low). The 2 and L ranges may be set to other ranges as long as they are forward travel ranges. The specific shape of the concavo-convex portion of the guide window 8 is such that the portion corresponding to the P position is formed in a deep concave groove shape, the R position is formed in a step shape that is one step lower than the convex portion, and the N position is It is formed in a step shape that is lower than the R position, and the D position is formed at substantially the same height as the N position. The 2 position is formed in a step shape that is one step higher than the D position, and the L position is formed in a step shape higher than the 2 position. As described above, since the guide pin 4 is always urged upward, the guide pin 4 engages with the upper edge of the uneven groove portion of the guide window 8 as described above when the knob button 3 is not operated. Yes.

In addition, a detent groove (not shown) is formed in the guide plate 7 separately from the guide window 8, and a detent spring (not shown) attached to the shift lever 1 is engaged with the detent groove, thereby shifting. The lever 1 may be positioned with a sense of moderation at each of the positions P, R, N, D, 2 and L.

As shown in FIGS. 1 and 4, a shift lock cam 10 is attached to a side surface of the guide plate 7 so as to be rotatable about a support shaft 11. The shift lock cam 10 is formed with a U-shaped groove 10a capable of accommodating the guide pin 4 in a substantially radial direction. When the knob button 3 is pushed in with the shift lever 1 in the P position (and the brake pedal is depressed), the guide pin 4 rotates the shift lock cam 10 in the clockwise direction in FIG. The guide window 8 can be slid to move to another range position. While the shift lever 1 is in the P position, the guide pin 4 is located in the U-shaped groove 10a, and after the R position, the guide pin 4 is disengaged from the U-shaped groove 10a.

One end of an inner cable 21 of the shift lock cable 20 is connected to the shift lock cam 10. The shift lock cable 20 has an inner cable 21 and an outer cable 22, and one end of the outer cable 22 is fixed to the vehicle body 5 by a bracket 23. The shift lock cam 10 is urged to rotate in the clockwise direction in FIG. The spring force of the return spring 24 is smaller than the spring force of the urging spring of the guide pin 4 built in the shift lever 1. The other end of the shift lock cable 20 extends to the shift lock device 30 disposed in the vicinity of the brake pedal 40.

A contact portion 10b is provided at the tip of one arm portion with the U-shaped groove 10a of the shift lock cam 10 therebetween. The abutting portion 10b abuts on the guide pin 4 when shifting from an N position to an R position, which will be described later, and is pushed by the guide pin 4 when the brake pedal 40 is depressed and the function of locking the N → R shift. Thus, the shift lock cam 10 is allowed to rotate counterclockwise in FIG. 1 and has a lock release function that allows the shift to the R position.

The shift lock device 30 includes a housing (fixing member) 31 as shown in FIGS. 2 and 3, and the other end of the outer cable 22 of the shift lock cable 20 is fixed to the housing 31. The other end of the inner cable 21 of the shift lock cable 20 is connected to a slide lock member 32 slidably disposed in the housing 31. The slide lock member 32 has two cylindrical land portions 33, 34 spaced apart in the axial direction, and the first land portion 33 on the distal end side is a key interlock perpendicular to the slide lock member 32. By engaging with the member 35, the slide lock member 32 can be locked in a state where the cable is pushed in (the state shown in FIG. 2). The key interlock member 35 is connected to a key cylinder (not shown) via a key interlock cable 36. When the engine key is inserted into the key cylinder and rotated from the LOCK position to the ACC position, the key interlock member 35 is detached from the first land portion 33 of the slide lock member 32, and the lock is released. Note that the key interlock mechanism itself is well known, for example, from Patent Document 1 and the like, and therefore will not be described in detail.

A first locking surface 34 a and a second locking surface 34 b are formed on both surfaces of the second second land portion 34 of the slide lock member 32. The first locking surface 34a on the right side of FIG. 2 is a surface that performs a shift lock when P → R, and the second locking surface 34b on the left side is a surface that performs a shift lock when N → R. A brake switch member 42 is disposed in the housing 31 so as to be slidable in a direction orthogonal to the slide lock member 32. Inside the brake switch member 42 are provided a slide pin 43 and a first spring 44 that urges the slide pin 43 in the protruding direction (contact direction with the brake pedal). A tip end portion of the slide pin 43 protruding from the brake switch member 42 contacts the contact portion 41 of the brake pedal 40. The brake switch member 42, the slide pin 43, and the first spring 44 constitute a brake switch that is turned ON / OFF in conjunction with the depression / release of the brake pedal 40.

As shown in FIGS. 2 and 3, the brake switch member 42 is slidable between a position intersecting the second land portion 34 of the slide lock member 32 and a position away from the second land portion 34. In the present embodiment, the contact portion 41 is set away from the housing 31 when the brake pedal 40 is depressed, and the contact portion 41 approaches the housing 31 when the brake pedal 40 is not depressed. A thin shaft portion 42a is integrally projected at the tip of the brake switch member 42, and this shaft portion 42a does not interfere with the second land portion 34 of the slide lock member 32 as shown in FIG. Extends into position. A second spring 45 is interposed between the shaft portion 42 a and the housing 31, and the second spring 45 attaches the entire brake switch including the brake switch member 42 in the contact direction with the contact portion 41 of the brake pedal 40. It is energized.

Next, the operation of the reverse shift limiting device of the present invention will be described with reference to FIGS. In the P range, as shown in FIG. 2, the inner cable 21 of the shift lock cable 20 is in a position where it is pushed into the housing 31. When the key position is in the LOCK position, the key interlock member 35 engages the first land portion 33 of the slide lock member 32, so that the shift from the P position to another position is performed regardless of the depression of the brake pedal 40. It is not possible. Further, when the engine key is turned to the ACC position or a position after that, the brake switch member 42 is in the first locking surface on the right side of the second land portion 34 of the slide lock member 32 when the brake pedal 40 is not depressed. Since 34a is locked, it is still impossible to shift from the P position to another position.

In the P range, when the engine key is turned to the ACC position or further and the brake pedal 40 is depressed, the key interlock member 35 is disengaged from the first land portion 33 of the slide lock member 32 as shown in FIG. Since the brake switch member 42 is disengaged from the second land portion 34 of the slide lock member 32, the shift lever 1 can be shifted from the P position to another position. When the shift lever 1 is operated while pressing the knob button 3, the guide pin 4 pushes the shift lock cam 10 in the clockwise direction in FIG.

FIG. 4 shows a state in which the shift lever 1 is at the N position. The guide pin 4 is at the N position of the guide window 8, and the contact portion 10 b of the shift lock cam 10 is in contact with the side surface of the guide pin 4. When the knob button 3 is not pushed, the guide pin 4 is in the upper position (shown by a solid line) and is engaged with the N position of the guide window 8, but when the knob button 3 is pushed, the guide pin 4 is in the lower position ( (Indicated by a two-dot chain line) and deviates from the N position of the guide window 8. However, even if the knob button 3 is pressed, the abutting portion 10b of the shift lock cam 10 stands up in front of the guide pin 4, so that it cannot be shifted to the R position unless the shift lock cam 10 is turned.

When the shift lever 1 is in the N position and the brake is OFF (in a state where the brake pedal 40 is not depressed), the shift lock device 30 is connected to the brake switch member by the contact portion 41 of the brake pedal 40 as shown in FIG. 42 is in the depressed position. Since the brake switch member 42 engages the second engagement surface 34b on the left side of the second land portion 34 of the slide lock member 32, the movement of the shift lock cable 20 in the pushing direction (R direction) is locked. That is, the rotation of the shift lock cam 10 is locked. In this state, even if the shift lever 1 is operated in the R direction while pressing the knob button 3, the guide pin 4 hits the contact portion 10b as shown in FIG. 4 and cannot be shifted to the R position. Even if an N → R shift is attempted without depressing the brake pedal 40 in this way, the R range cannot be achieved. Therefore, even if the accelerator pedal is depressed by mistake with the brake pedal, sudden start can be prevented.

FIG. 5 shows a state in which the shift lever 1 is being shifted from the N → R position while the brake is ON (the brake pedal 40 is depressed). As for the shift lock device 30, as shown in FIG. 7B, the contact portion 41 of the brake pedal 40 is separated from the housing 31, so that the brake switch member 42 is retracted by the second spring 45 in response to the second land 45. The slide lock member 32 is released from the portion 34 and unlocked. Therefore, the movement of the shift lock cable 20 in the pushing direction (R direction), that is, the shift lock cam 10 can be rotated. When the shift lever 1 is operated in the R direction while pressing the knob button 3 in this state, the guide pin 4 can press the contact portion 10b of the shift lock cam 10 and shift to the R position.

FIG. 6 shows a state after the shift lever 1 is shifted to the R position. The guide pin 4 moves to the R position of the guide window 8 and is in contact with the edge of the contact portion 10b of the shift lock cam 10. In this state, since the brake switch member 42 of the shift lock device 30 is in contact with the outer peripheral surface of the second land portion 34 of the slide lock member 32, the slide lock member 32 is slid regardless of the depression of the brake pedal 40. The shift lock cam 10 can be rotated. Therefore, it is possible to shift in any of R → P and R → N. When the shift lever 1 is shifted from R to P while the knob button 3 is being pressed, the guide pin 4 can get over the contact portion 10b of the shift lock cam 10 and enter the U-shaped groove 10a to return to the state shown in FIG. .

In the above-described embodiment, the example in which the key interlock member 35 is engaged with the first land portion 33 of the slide lock member 32 has been described. However, the key interlock member 35 is engaged with the slide lock member 32 in the present invention. Not required. For example, the key interlock member 35 may be arranged to engage with the shift lock cam 10 to perform the key interlock from the P position to another position.

Further, as the slide lock member 32, a member having a plurality of land portions on the central axis and having both side surfaces of one land portion 34 as the first and second locking surfaces is used, but the present invention is not limited to this. As in Patent Document 1, a plurality of engagement grooves may be formed on the side surfaces of the prismatic component, and the side surfaces of these engagement grooves may be used as the first and second locking surfaces. As the brake interlocking member that locks the first locking surface and the second locking surface of the slide lock member 32, the brake switch member 42 that contacts the brake pedal 40 is used. However, the brake switch member 42 is not limited to the brake switch. Any member can be used as long as it moves in conjunction with the member. Furthermore, the configuration of the brake switch member 42, the slide pin 43, the first spring 44, the shaft portion 42a, and the second spring 45 is not limited to the structure as shown in FIG.

DESCRIPTION OF SYMBOLS 1 Shift lever 3 Bob button 4 Guide pin 7 Guide plate 8 Guide window 10 Shift lock cam 10a U-shaped groove 10b Contact part 20 Shift lock cable 21 Inner cable 22 Outer cable 30 Shift lock apparatus 32 Slide lock member 34 2nd land part 34a First locking surface 34b Second locking surface 35 Key interlock member 40 Brake pedal 41 Contact portion 42 Brake switch member

Claims (1)

A shift lever provided with a knob button on the operation knob, which is switchable in order to each range of at least P-R-N-D;
A guide pin that moves in the axial direction of the shift lever in conjunction with the knob button of the shift lever;
A guide window that is formed corresponding to the position of each range and that can engage the guide pin;
A rotatable shift lock cam that contacts the guide pin, locks the guide pin in the P position, and locks the shift lever in the P position;
A shift lock cable having one end coupled to the shift lock cam;
A slide lock member connected to the other end of the shift lock cable and slidable with respect to the fixed member;
A brake interlocking member that moves in conjunction with the depression of the brake pedal,
In the automatic transmission in which when the shift lever is in the P position and the brake pedal is not depressed, the brake interlocking member locks the first locking surface of the slide lock member and restrains the operation of the shift lock cable.
The shift lock cam is provided with a contact portion that contacts the guide pin in a state where the shift lever is at the N position and the knob button is operated,
The slide lock member is provided with a second locking surface that engages with the brake interlocking member when the shift lever is at the N position and the brake pedal is not depressed,
When the shift lever is operated from the N position to the R position while operating the knob button in a state where the brake pedal is not depressed, the brake interlocking member locks the second locking surface to lock the shift lock. The cam is in a locked state, and the movement of the guide pin to the R position is restricted by the contact portion of the shift lock cam,
When the shift lever is operated from the N position to the R position while operating the knob button while the brake pedal is depressed, the engagement between the brake interlocking member and the second locking surface is released. A reverse shift limiting device in which the shift lock cam is brought into an unlocked state, and the guide pin can press the contact portion of the shift lock cam to shift to the R position.

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