JP3606714B2 - Automatic transmission parking mechanism - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention belongs to the technical field of an automatic transmission parking mechanism.
[0002]
[Prior art]
Conventionally, as a parking mechanism of an automatic transmission, for example, it has been known according to the actual Unexamined 6 -78 132 JP.
[0003]
As shown in FIG. 4, this conventional mechanism includes a rod that operates in the axial direction in conjunction with a manual lever of an automatic transmission, a cam mounted on the tip of the rod, and a support having a slope on which the cam rides. An automatic transmission comprising an actuator and a parking pole that moves in a direction crossing the axial direction of the cam by the axial movement of the cam accompanying the operation of the rod and meshes the pawl with a parking gear provided on the output shaft In this parking mechanism, the axial movement of the support actuator is restricted by the case member side end face and the cover member side end face, and a rotation preventing groove is provided on the case member side as means for restricting the rotation of the support actuator. Are provided with anti-rotation protrusions.
[0004]
[Problems to be solved by the invention]
However, in the above-described conventional automatic transmission parking mechanism, the support actuator has only one stopper surface for receiving the parking pole that generates a releasing force by being disengaged from the parking gear when the parking mechanism is released from the parking range. Therefore, when the parking range is released, a force that tries to rotate only in the direction of arrow C (the urging force by the return spring) always acts on the support actuator, and the non-rotating groove C ′ surface is liable to cause one-side wear. .
[0005]
In other words, the anti-rotation groove and the anti-rotation protrusion are always set to be loose in order to secure the assembling property. Therefore, when a force acting to rotate only in one direction is applied to the support actuator, the C ′ surface of the anti-rotation groove The detent protrusion comes into contact only with the wheel, and if it is erroneously selected for the P range during traveling, the parking pole reciprocates violently and collides with the stopper surface of the support. When the support actuator rotates in the rotation direction in conjunction with this, the contact portion gradually wears.
[0006]
When this one-side wear occurs, the shaft of the support actuator is displaced, and the meshing between the parking pole and the parking gear changes.
[0007]
The present invention has been made by paying attention to the above-mentioned conventional problems, and the problem is that the cause of the shaft misalignment of the support actuator while reducing the number of parts, processing man-hours, assembly man-hours, and cost. It is an object of the present invention to provide a parking mechanism for an automatic transmission that prevents one wear of a non-rotating groove.
[0008]
[Means for Solving the Problems]
(Solution 1)
In order to solve the above-mentioned problem, in the invention according to claim 1, a case member and a cover member for accommodating a transmission mechanism of an automatic transmission,
A rod that operates in the axial direction in conjunction with a manual lever of the automatic transmission;
A cam attached to the tip of this rod;
A hollow semi-cylindrical support actuator having a slope on which the cam rides;
A parking pole that moves in a direction crossing the axial direction of the cam by the axial movement of the cam accompanying the operation of the rod and meshes the pawl with a parking gear provided on the output shaft ;
The case member and the cover member are formed with a case member side end surface and a cover member side end surface that restrict axial movement of the support actuator,
The at least one of the case member and the cover member and the support actuator are provided with a non-rotating groove and a non-rotating protrusion for restricting the rotation of the support actuator
A part of an automatic transmission in which a backlash is formed at a fitting portion between the rotation prevention groove and the rotation prevention projection.
In the king mechanism,
The support actuator is provided only on the circumferential opposite end surfaces of the stop surface to support the actuator for receiving the parking pawl to produce a release force off the engagement of the parking gear when it is released from the parking range, the pawl of the parking pole A pole-side stopper surface that is in pressure contact with the two stopper surfaces in the parking range release state is formed on the back surface on the opposite side .
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings.
[0011]
(Embodiment 1)
The first embodiment corresponds to the invention described in claim 1 .
[0012]
FIG. 1 is a diagram illustrating a main part of a parking mechanism of an automatic transmission according to a first embodiment, and FIG. 2 is a diagram of the automatic transmission to which the parking mechanism according to the first embodiment is applied as viewed from the rear with the rear extension removed. 3 is a cross-sectional view taken along line AA of FIG. 2 showing the parking mechanism of the first embodiment.
[0013]
2 and 3, 1 is a transmission case (case member), 2 is a rear extension (cover member), 3 is an output shaft, 4 is a parking gear, 5 is a parking pole, 6 is a rod, and 7 is a support actuator.
[0014]
The transmission case 1 and the rear extension 2 are coupled by bolts, and a transmission mechanism including a planetary gear and a fastening element is accommodated therein, and a parking gear 4 is provided on the output shaft 3 of the transmission mechanism. A parking pole 5 is disposed at a position corresponding to the parking gear 4. That is, a parking mechanism is laid out on the transmission case 1 side, which is a connecting portion between the transmission case 1 and the rear extension 2.
[0015]
One end of the parking pole 5 is pivotally attached to the transmission case 1 by a pin 8. When the parking pole 5 rotates to the right in FIG. 2, the pawl 5 a meshes with the parking gear 4 and restricts the rotation of the output shaft 3. The parking pole 5 is urged in a meshing release direction by a spring 9.
[0016]
The rod 6 operates in the axial direction in conjunction with a manual lever (or select lever) (not shown) of the automatic transmission and the manual plate 10 shown in FIG. 3, and a cam 11 having a slope 11 a at the tip of the rod 6. The parking pole 5 and the support actuator 7 have slopes 5b and 7a on which the cam 11 rides. That is, when the rod 6 is moved in the axial direction in the direction B in FIG. 3 by the select operation from the other range to the parking range by the manual lever, the cam 11 rides on the support actuator 7 after the slope contact, and the parking pole 5 is moved in the axial direction. The claws 5a are engaged with the parking gear 4 provided on the output shaft 3 by moving in the intersecting direction (FIG. 2).
[0017]
The support actuator 7 is set in an actuator mounting groove 1a formed in the transmission case 1, and, as shown in FIG. 3, is defined by a case side end surface 1b (case member side end surface) and an extension side end surface 2a (cover member side end surface). Axial movement is restricted. Further, as shown in FIG. 2, the rotation of the support actuator 7 is restricted by fitting the rotation prevention groove 1 c formed on the transmission case 1 and the rotation prevention projection 7 b formed on the support actuator 7. Yes.
[0018]
Further, as shown in FIG. 1, the support actuator 7 has a parking pole 5 that is released from the meshing with the parking gear 4 when released from the parking range and generates a release force (force by a biasing force or the like by the spring 9). Receiving stopper surfaces 7c and 7d are provided at two locations with the rotation axis L in between.
[0019]
The stopper surfaces 7c and 7d have a support semi-cylindrical support actuator 7 and two end surfaces in the circumferential direction as stopper surfaces. Further, pole-side stopper surfaces 5c and 5d are formed on the back surface of the parking pole 5 opposite to the claws 5a so as to be in pressure contact with the two stopper surfaces 7c and 7d simultaneously when the parking range is released.
[0020]
Next, the operation will be described.
[0021]
[Attaching the support actuator]
The attachment procedure of the support actuator 7 will be described. First, the support actuator 7 is mounted in the actuator mounting groove 1a formed in the transmission case 1 while the rotation protrusion 7b of the support actuator 7 is fitted in the rotation stop groove 1c.
[0022]
Thereafter, the rear extension 2 is put on the transmission case 1 while adjusting the bolt hole position, and the rear extension 2 is attached to the transmission case 1 by fastening the bolts.
[0023]
With this attachment, the support actuator 7 is restricted from moving in the axial direction by the case-side end surface 1b and the extension-side end surface 2a, and the rotation is restricted by the fitting between the rotation-preventing groove 1c and the rotation-preventing protrusion 7b.
[0024]
Therefore, compared with the parking mechanism described in Japanese Utility Model Laid-Open No. 62-121158, the number of parts and the number of assembling steps can be reduced, and the cost can be reduced, and further, a tap for fastening a bolt to the case is formed. In addition, it is not necessary to form a positioning hole in the plate, and the number of processing steps can be reduced, thereby reducing the cost.
[0025]
[Stopper action by support actuator]
When the manual lever is selected from the parking range position to another range position, the parking pole 5 rotates from the imaginary line position to the solid line position in FIG. It hits the support actuator 7.
[0026]
When the parking pole 5 hits the support actuator 7, the support actuator 7 is provided with two stopper surfaces 7c and 7d for receiving the parking pole 5 with the rotating shaft L interposed therebetween. , 7d hits the parking pole 5. At this time, since the fitting portion between the rotation prevention groove 1c and the rotation prevention projection 7b is loose, even if the two stopper surfaces 7c and 7d are inclined, the stopper surface 7c, 7d is stable.
[0027]
The release force of the parking pole 5 is received by the two stopper surfaces 7c and 7d of the support actuator 7, but the rotational moments due to these two forces cancel each other because the directions of action are different from each other and the magnitude is almost equal. The rotation of the support actuator 7 in the circumferential direction is reduced, and the anti-rotation projection 7b is prevented from coming into contact with only one side of the anti-rotation groove 1c and causing one-side wear.
[0028]
Next, the effect will be described.
[0029]
(1) The transmission case 1 and the rear extension 2 are formed with a case side end surface 1b and a rear extension side end surface 2a for restricting the axial movement of the support actuator 7, and the support actuator is provided between the transmission case 1 and the support actuator 7. The stopper 7 is provided with a non-rotating groove 1c and a non-rotating protrusion 7b for restricting the rotation of the stopper 7, and receives a parking pole 5 that generates a releasing force when the support actuator 7 is disengaged from the parking gear 4 when released from the parking range. Since the surfaces 7c and 7d are provided at two positions across the rotation axis L, the rotation prevention groove 1c that causes the shaft displacement of the support actuator 7 while reducing the number of parts, the number of processing steps, the number of mounting steps, and the cost. Automatic transmission parkin to prevent wear on one side It is possible to provide a mechanism.
[0030]
(2) The support actuator 7 has a hollow semi-cylindrical shape, and both end surfaces thereof in the circumferential direction are provided with two stopper surfaces 7c and 7d. Since the pole-side stopper surfaces 5c and 5d that are in pressure contact with the stopper surfaces 7c and 7d at the same time are formed, when the release force of the parking pole 5 is received by the support actuator 7, the two moment spans are almost equal and the force By keeping the action point constant, the rotation of the support actuator 7 can be suppressed with high stability.
[0031]
(Other embodiments)
In the first embodiment, an example in which the support actuator is mounted on the transmission case side has been shown. However, as an example in which the support actuator is mounted on the cover member side, and an example in which the support actuator is mounted across both the case member and the cover member. Also good.
[0032]
In the first embodiment, an example in which the rotation prevention protrusion is formed on the support actuator side and the rotation prevention groove is formed on the transmission case side is shown. Conversely, the rotation prevention groove is formed on the support actuator side and the transmission case side is formed. It is also possible to form an anti-rotation protrusion on the surface.
[0033]
According to the first aspect of the present invention, a case member and a cover member that house a transmission mechanism of an automatic transmission, a rod that operates in an axial direction in conjunction with a manual lever of the automatic transmission, and a tip portion of the rod , A hollow semi-cylindrical support actuator having a slope on which the cam rides, and an axial movement of the cam that accompanies the operation of the rod moves the cam in the direction intersecting the axial direction of the cam. A parking pole that meshes with a parking gear provided on the output shaft, and the case member and the cover member are formed with a case member side end surface and a cover member side end surface that restrict movement of the support actuator in the axial direction. The rotation that restricts the rotation of the support actuator to at least one of the members and the support actuator Provided the fit groove and detent projection, in the parking mechanism of an automatic transmission that forms a backlash in the fitting portion between the detent grooves and detent projection, the support actuator, and a parking gear when it is released from the parking range Stopping surfaces that receive the parking poles that release from the engagement of the two sides are provided only on both end faces in the circumferential direction of the support actuator. On the back side opposite to the pawls of the parking poles, two stopper faces when the parking range is released The pole-side stopper surface that is in pressure contact with the surface makes it possible to reduce the number of parts, processing man-hours, assembly man-hours, and costs, while also preventing automatic wear of the non-rotating groove that causes shaft misalignment of the support actuator. it is possible to provide a parking mechanism of the machine, further, support Aku Ju the release force of the parking pole When received by over data, two moments span almost equal, and, when the point of application of force is also kept constant, it is possible to suppress the rotation of the support actuator by high stability, the effect is obtained that.
[Brief description of the drawings]
FIG. 1 is a diagram showing a main part of a parking mechanism of an automatic transmission according to a first embodiment of the present invention.
FIG. 2 is a view of the automatic transmission to which the parking mechanism of the first embodiment is applied as viewed from the rear with the rear extension removed.
3 is a cross-sectional view taken along line AA of FIG. 2 showing the parking mechanism of the first embodiment. FIG.
FIG. 4 is a view showing a parking mechanism of a conventional automatic transmission.
[Explanation of symbols]
1 Transmission case (case member)
1b Case side end surface (Case member side end surface)
1c Non-rotating groove 2 Rear extension (cover member)
2a Rear extension side end face (cover member side end face)
3 Output shaft 4 Parking gear 5 Parking pole 5a Claw 5c, 5d Pole side stopper surface 6 Rod 7 Support actuator 7b Non-rotating protrusion 7c, 7d Stopper surface 11 Cam

Claims (1)

A case member and a cover member for accommodating the speed change mechanism of the automatic transmission;
A rod that operates in the axial direction in conjunction with a manual lever of the automatic transmission;
A cam attached to the tip of this rod;
A hollow semi-cylindrical support actuator having a slope on which this cam rides;
A parking pole that moves in a direction crossing the axial direction of the cam by the axial movement of the cam accompanying the operation of the rod and meshes the pawl with a parking gear provided on the output shaft ;
Forming on the case member and the cover member a case member side end surface and a cover member side end surface for restricting the axial movement of the support actuator,
The at least one of the case member and the cover member, and the support actuator are provided with a non-rotating groove and a non-rotating protrusion for restricting the rotation of the support actuator,
In the automatic transmission parking mechanism in which a backlash is formed at the fitting portion between the rotation prevention groove and the rotation prevention projection,
The support actuator is provided with stopper surfaces that receive a parking pole that generates a releasing force that is disengaged from the parking gear when the support actuator is released from the parking range , only on both circumferential ends of the support actuator .
A parking mechanism for an automatic transmission, characterized in that a pole-side stopper surface that is in pressure contact with two stopper surfaces in a parking range release state is formed on the back surface on the opposite side to the pawl of the parking pole .

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