JP3944920B2 - Shifting mechanism of automatic transmission - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a shift operation mechanism for an automatic transmission, and more particularly to a shift operation mechanism for an automatic transmission having an improved parking mechanism.
[0002]
[Prior art]
In general, a shift operation mechanism of an automatic transmission is provided with a parking mechanism that locks a main shaft to prevent self-running when a driver puts a shift lever into a parking range (P range).
[0003]
The parking mechanism includes, for example, a manual shaft that rotates about an axis in conjunction with the swing of a shift lever, a manual plate that is supported by the manual shaft and rotates integrally with the shaft, and a rear plate that is connected to the manual plate. A parking rod having an end portion rotatably connected and a cam provided at the tip portion is provided, and the parking rod advances and retreats from an opening portion provided in the case as the manual shaft and the manual plate rotate. Is configured to do.
[0004]
When the shift lever is put into the P range, the parking rod moves forward most, and the cam at the tip of the parking rod is supported swingably outside the case and the actuator supported by the support plate at the opening. The nail formed on the parking pole by entering between the parking pole and moving in a predetermined direction by contact with the actuator, for example, rising upward, and pushing up the parking pole along with this rising Meshes with the gear of the output shaft to lock the main shaft.
[0005]
On the other hand, when the shift lever is put into a range other than the P range, such as the N range or the D range, the parking rod is retracted, the parking pole is lowered, and the pawl of the pole and the gear of the output shaft are engaged. It comes to come off.
[0006]
In that case, the parking rod gradually retracts as the shift lever is sequentially switched from the P range. Therefore, simply providing an opening in the case causes the parking rod to come off from the opening and fall out of the case. Will end up.
[0007]
In order to deal with this, for example, in Japanese Patent Publication No. 3-35134, a tubular sleeve extended to the last retracted position of the parking rod is provided in the opening, and the parking rod is placed in the tubular sleeve. Sliding back and forth is disclosed. According to this, the parking rod is locked to the opening regardless of which range the shift lever is put in, and can advance and retreat from the opening without dropping.
[0008]
[Problems to be solved by the invention]
However, in order to lock the parking rod with respect to the opening, it is only necessary to support the rod from below, and there is no need to use a tubular sleeve as disclosed in the above publication.
[0009]
When the cylindrical sleeve is installed in the opening, when the parking rod is assembled, the rod cannot be inserted at an angle with respect to the opening, and it must be inserted as parallel as possible from the rearward extension end of the sleeve. Therefore, the degree of freedom is greatly restricted, and the assembly workability is reduced.
[0010]
Therefore, an object of the present invention is to provide a shift operation mechanism of an automatic transmission provided with a parking mechanism capable of moving a parking rod forward and backward from an opening without using a circular sleeve.
[0011]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention is characterized as follows.
[0012]
That is, the present invention is provided with a rod member that advances and retreats from an opening provided in the case in conjunction with the operation of the shift lever, and when the rod member advances in the parking range, the cam body provided at the tip portion thereof. Moves in a predetermined direction in contact with the actuator arranged in front of the opening, and outputs a parking pole as a lock member supported swingably on the case side member while being restrained by the actuator. by moving to a position preventing rotation of the shaft, a speed change operation mechanism of an automatic transmission configured to lock the output shaft receives the受支from below the rod member to its last retreat position with a surface is provided, the opening is circular provided on the side wall of the case, the receiving surface, the lower surface of the opening integrally with the side wall of the case Consecutive is formed in a semicircular cross section, the actuator at the forefront of the receiving surface is supported, the cam body, the tip of the rod member, sliding in a state of being biased forward by a spring The outer part is freely fitted, and the rear part is extended rearward by a predetermined length so as to cover the periphery of the rod member and the spring, and in the forward traveling range, the receiving surface having a semicircular cross section is provided. retracted by sliding, the actuator and constrained by the parking pawl is released, the rotation blocking is configured to be released, when the most backward in the forward drive range, the circular in the opening It is comprised so that it may move to.
[0013]
According to the above configuration , the rod member is supported from below by the receiving surface having a semicircular cross-section to its last retracted position, so that the rod member can advance and retract without dropping from the opening , and the tubular sleeve can be There is no need to use it, the space that can be used when assembling the rod member is increased, the degree of freedom is secured, and the deterioration of the assembling workability can be suppressed.
[0015]
In the forward travel range, the cam body is configured to slide back on the semicircular cross-section receiving surface to release the restraint by the actuator and the parking pole as the lock member. In addition, when the vehicle travels most backward in the forward travel range, it is configured to move into the circular opening , so that, for example, vibration occurs during travel in the D range and the rod member moves upward or Even if it bounces in the lateral direction, problems such as damage caused by a rod member colliding with a member arranged in a direction where the receiving surface is not provided, for example, the upper side or the lateral end surface of the opening are eliminated. It will be.
[0017]
Also, the rear portion of the cam body, since it is extended to a predetermined length rearward so as to cover the periphery of the rod member and the spring, without using to prepare a new shelf member, the rear extension of this cam Thus, the rod member is covered, and interference with other members is prevented.
[0023]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0024]
As shown in FIGS. 1 and 2, the speed change operating mechanism 1 in this embodiment includes a base plate 12 that extends in the vertical direction and is attached to the side wall 2 a of the transmission case 2 with a bolt 11 at the lower end. .
[0025]
The base plate 12 includes a support shaft 12a that rotatably supports a swing arm 13, a detent arm 14, and the like, which will be described later, and has a cylindrical convex portion 12b on the lower outer surface, and the cylindrical convex portion 12b. Is positioned in the case 2 by being fitted into a circular recess 2b formed in the side wall 2a.
[0026]
A cylindrical boss portion 12c is provided on the inner surface of the lower portion of the base plate 12 coaxially with the cylindrical convex portion 12b. The cylindrical boss portion 12c rotates about the axis in conjunction with the operation of a shift lever (not shown). An end portion of the moving manual shaft 15 is rotatably fitted. The other end of the manual shaft 15 is pivotally supported by a hole 2d provided in the opposite side wall 2c of the side wall 2a.
[0027]
Further, a manual plate 16 in which a guide groove 16a having a predetermined shape and recesses 16b... 16b corresponding to the respective input ranges of the shift lever are formed on the peripheral portion is supported on the manual shaft 15 through the cylindrical boss portion 16c. The shaft 15 is rotated integrally with the shaft 15.
[0028]
And the detent arm 14 which comprises a detent mechanism with the rocking | fluctuating arm 13 which has the pin 13a engaged with the said guide groove 16a, and the said recessed part 16b ... 16b can each turn to the spindle 12a of the said baseplate 12 so that rotation is possible. It is supported.
[0029]
An engaging groove 13b is formed at the lower end of the swing arm 13, and a pin 18a formed at the end of the manual valve 18 that slides in the valve case 17 is engaged with and connected to the engaging groove 13b. Has been.
[0030]
A lower end portion of the detent arm 14 is branched into two, and a roller 19 having a size capable of fitting into the concave portions 16b... 16b is rotatably attached between the branched lower end portions 14a and 14a. The detent arm 14 or the roller 19 is always urged toward the manual plate 16 by a coil spring 20 attached to the support shaft 12a.
[0031]
With this configuration, when the manual shaft 15 and the manual plate 16 are rotated by the operation of the shift lever, the pin 13a of the swing arm 13 is driven along the guide groove 16a of the manual plate 16, and the swing arm 13 swings around the upper support shaft 12 a of the base plate 12.
[0032]
As a result of the swinging motion, the manual valve 18 connected to the lower end of the arm 13 moves in the valve case 17, and the hydraulic circuit is switched for the range in which the shift lever is inserted.
[0033]
In this case, the rotation of the manual plate 16 is regulated at each range position by the detent mechanism constituted by the recesses 16b... 16b and the detent arm 14, so that the swing amount of the swing arm 13, that is, the manual valve 18 is controlled. Is determined for each range.
[0034]
In this embodiment, as the shift lever input range, in order from the P range (parking), the N range (neutral), the R range (reverse), the D range, the S range, and the L range (above, forward). FIG. 1 shows a state when the shift lever is put into the R range. In this state, the manual plate 16 rotates clockwise as the shift lever is switched to the N range and P range, and also rotates counterclockwise as the shift lever is switched to the D range, S range, and L range.
[0035]
Next, a parking mechanism that is a characteristic part of the present invention will be described.
[0036]
An S-shaped rod 21 is rotatably connected to the manual plate 16 rotated by a shift lever operation at a rear end portion 21a, and a peripheral surface is tapered at a distal end portion of the S-shaped rod 21. The cam body 22 is shaped to be slidably fitted in a state of being urged forward by a spring 23. In this case, the rear portion 22a of the cam body 22 is extended rearward by a predetermined length so as to cover the periphery of the S-shaped rod 21 and the spring 23.
[0037]
On the other hand, as shown in FIGS. 3 and 4, the side wall 2e of the case 2 is provided with a circular opening 24, and a shelf 2f is projected from the outer surface of the side wall 2e. A receiving surface 2g having a semicircular cross section that extends inward and outward of the case 2 and continues to the lower surface 24a of the circular opening 24 is formed on 2f.
[0038]
When the cam body 22 is placed on the receiving surface 2g and the manual plate 16 rotates while the cam body 22 provided at the S-shaped rod 21 or the tip thereof is inserted through the opening 24. As the S-shaped rod 21 moves back and forth, the cam body 22 slides on the receiving surface 2g and advances and retreats from the opening 24. Specifically, when the shift lever is inserted into the P range, the manual plate 16 rotates most clockwise in FIG. 1 so that the cam body 22 moves forward most and when the shift lever is inserted into the L range, the manual plate 16 rotates most counterclockwise, and the cam body 22 retracts most.
[0039]
An arcuate actuator 25 having a tapered surface is supported at the foremost portion of the receiving surface 2g by a support plate 27 fixed to the shelf 2f by bolts 26, 26, and the outer surface of the side wall 2e. In addition, a parking pole 29 that is swingable about the support shaft 28 is provided.
[0040]
In that case, the parking pole 29 is urged downward by the spring 30, and its swing end is in contact with both ends of the arc of the actuator 25. The actuator 25 is not fixed between the shelf 2f and the support plate 27 so that the biasing force by the swinging end of the parking pole 29 is evenly applied to both ends of the arc. Is supported rotatably. That is, it is fitted and supported in a state where it is engaged with the semicircular recess 2 h formed on the entire surface of the shelf 2 f and the arc surface of the opening 27 a formed on the support plate 27.
[0041]
The parking pole 29 is provided with a claw 29a. When the parking pole 29 moves up against the spring 30, the claw 29a meshes with a parking gear 32 supported by the output shaft 31, As a result, the output shaft 31 is locked.
[0042]
With the above configuration, when the shift lever is inserted into the P range, the cam body 22 moves forward most on the receiving surface 2g as the manual plate 16 rotates, and is arranged at the foremost portion of the receiving surface 2g. The actuator 25 enters between the actuator 25 and the parking pole 29 biased toward the actuator 25. At this time, the actuator 25 abuts on the tapered surface of the actuator 25 and moves upward.
[0043]
Then, as shown in FIG. 5, the parking pole 29 is pushed upward by the raised cam body 22, and the pawl 29 a formed on the pole 29 meshes with the parking gear 32 integrated with the output shaft 31, and the output The shaft 31 is locked, and self-propelled parking is prevented.
[0044]
Here, as described above, in this embodiment, each range of N, R, D, S and L is provided below the P range, and the position of the cam body 22 in the P range is shown in FIG. The position of the cam body 22 in the R range is shown in FIG. In the N range between these, although not shown, the cam body 22 moves forward from the position in the R range, and the actuator 25 extends along the actuator 25 to such an extent that the pawl 29a of the parking pole 29 and the parking gear 32 of the output shaft 31 do not mesh. Rise somewhat.
[0045]
In that case, in these three ranges, the cam body 22 or the tip of the S-shaped rod 21 enters the state between the actuator 25 and the parking pole 29, and in particular, the downward bias of the parking pole 29 Thus, the S-shaped rod 21 is constrained.
[0046]
On the other hand, the position of the cam body 22 in each forward travel range of D, S, and L is shown in FIG. In the figure, the solid line indicates the position in the D range, and the chain line indicates the position in the L range where it moves most backward. The position in the S range between these is not shown in the figure, but is substantially in the middle of these.
[0047]
At this time, the receiving surface 2g on which the cam body 22 slides or the lower surface 24a of the opening 24 is continuously formed up to the position of the L range where the cam body 22 is most retracted. This prevents the case 2 from coming off and falling off.
[0048]
In these three forward travel ranges, the tip of the cam body 22 or the S-shaped rod 21 is retracted from the position in the R range, and the restriction by the actuator 25 and the parking pole 29 is released. In this case, as shown in FIG. 6, the cam body 22 or its rear extension 22 a moves directly below the upper end surface 24 b of the opening 24.
[0049]
Thereby, for example, even if the vibration is generated while traveling on a rough road surface in the D range or the like, and the S-shaped rod 21 released from the constraint in the D-range jumps upward or laterally, the S-shaped rod 21 or the spring 23 is covered with the rear extension 22a of the cam body 22, so that it does not collide with the upper end surface 24b or the side end surface of the opening 24, and problems such as damage are eliminated. become.
[0050]
As described above, in the three ranges P, R, and N, the S-shaped rod 21 is constrained between the actuator 25 and the parking pole 29. As described above, even if the portion of the S-shaped rod 21 or the spring 23 not covered with the cam rear extension 22a passes through the opening 24, the position does not shift upward or laterally, and collision or damage occurs. do not do.
[0051]
Further, only the lower surface 24 a of the circular opening 24 is continuous with a semicircular receiving surface 2 g that receives the sliding of the cam body 22 that moves forward and backward with respect to the opening 24 from below, and the upper portion of the opening 24. Since only the upper end surface 24b is provided, the following effects can be obtained when the parking mechanism is assembled to the case 2.
[0052]
That is, when the S-shaped rod 21 having the cam body 22 at the tip is inserted through the circular opening 24, the S-shaped rod 21 is inserted from the lower opening 2i to which an oil pan (not shown) is attached in the case 2. Then, the cam body 22 is allowed to pass through the circular opening 24. In this case, as shown in FIG. 7, a sleeve S is also provided on the upper part of the circular opening 24 to form a circular tube as a whole. If this is the case, when the S-shaped rod 21 is inserted into the case 2, the cam body 22 at the tip end abuts against the sleeve S, making it difficult to insert it into the circular opening 24.
[0053]
In this case, in order to insert the S-shaped rod 21 through the circular opening 24, the rod 21 must be inserted deeply into the case 2 until it is as parallel as possible to the tubular sleeve S, and is shallow in the vicinity of the lower opening 2i. By the way, the assembly work cannot be done.
[0054]
Moreover, since the rear end portion of the S-shaped rod 21 is connected to other members of the speed change operation mechanism 1 including the manual plate 16, the degree of freedom in work is extremely restricted.
[0055]
In contrast, in this embodiment, since the upper part of the circular opening 24 is only the upper end face 24b as described above, even if the S-shaped rod 21 is passed through the opening 24 at an angle, The cam body 22 at the front end is not prevented from entering, and the assembling work of the parking mechanism can be performed efficiently.
[0063]
【The invention's effect】
As described above, according to the present invention, the rod member is supported from below by the semicircular receiving surface to the last retracted position, so that the rod member can advance and retreat without dropping from the opening , There is no need to use a circular sleeve, and the space that can be used when assembling the rod member is increased, so that the degree of freedom is secured, and the deterioration in assembling workability can be suppressed.
[0064]
Further, when the cam body is configured to slide back on the semicircular cross-section receiving surface in the forward travel range and release the restraint by the actuator and the lock member, When the vehicle travels most backward in the travel range, it is configured to move into the circular opening . For example, vibration occurs during travel in the D range and the rod member jumps upward or laterally. Even if the rod member collides with a member arranged in a direction in which the receiving surface is not provided, for example, the opening or the lateral end surface of the opening , the rod member is damaged.
[0065]
Then, the rear portion of the cam body, since it is extended to a predetermined length rearward so as to cover the periphery of the rod member and the spring, without using to prepare a new shelf member, the rear extension of this cam Thus, the rod member is covered, and interference with other members is prevented.
[Brief description of the drawings]
FIG. 1 is a front view of a speed change operation mechanism according to an embodiment of the present invention.
FIG. 2 is a side view of the speed change operation mechanism.
FIG. 3 is a cross-sectional view around a circular opening provided in a case.
FIG. 4 is a side view of a parking mechanism around the circular opening.
FIG. 5 is an explanatory diagram of an operating state of the parking mechanism.
FIG. 6 is an explanatory view of the operating state of the parking mechanism.
FIG. 7 is an explanatory diagram of the effect of the parking mechanism according to the present invention .
[ Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Shifting operation mechanism 2 Transmission case 2g Receiving surface 15 Manual shaft 16 Manual plate 21 S-shaped rod 22 Cam body 22a Back extension part 24 Opening 24a Lower surface 24b Upper end surface 25 Actuator 27 Support plate 29 Parking pole 31 Output shaft 32 Parking gear

Claims (1)

A rod member that moves forward and backward from the opening provided in the case in conjunction with the operation of the shift lever is provided. When the rod member moves forward in the parking range, the cam body provided at the tip of the rod member moves forward of the opening. The parking pole as a lock member supported in a swingable manner on the case side member is prevented from rotating the output shaft while being in contact with the arranged actuator and moving in a predetermined direction while being restrained by the actuator. A shift operation mechanism of an automatic transmission configured to lock the output shaft by being moved to a position;
With a receiving surface for受支from below the rod member to its last retreat position is provided, the opening is circular provided on the side wall of the case, the receiving surface, the integral with the side wall of the case It is formed in a semicircular cross section that is continuous with the lower surface of the opening , and the actuator is supported at the forefront of the receiving surface,
The cam body is slidably fitted to the tip of the rod member in a state of being urged forward by a spring, and the rear portion has a predetermined length so as to cover the periphery of the rod member and the spring. In the forward travel range, in the forward travel range, the receiving surface having a semicircular cross-section is slid and retracted, the restraint by the actuator and the parking pole is released, and the rotation prevention is released. And a shift operation mechanism for an automatic transmission, wherein the shift operation mechanism is configured to move into the circular opening when the vehicle travels backward most in the forward travel range.

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