JPH0678132U - Automatic transmission parking mechanism - Google Patents

Abstract

(57) [Summary] [Purpose] To reduce the number of parts, processing man-hours, assembly man-hours, and cost. [Structure] A case-side contact surface and a cover-side contact surface that sandwich the support actuator 9 from the axial direction of the rod 7 and restrict axial movement of the rod are formed in the case 1 and the side cover. While forming the engagement protrusion 9c, the case 1 is formed with a recessed groove 1d that engages with the engagement protrusion 9c in the rotation direction, so that the support actuator 9 is positioned by the case 1 and the side cover.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a parking mechanism for an automatic transmission.

[0002]

[Prior art]

 Conventionally, as a parking mechanism of an automatic transmission, for example, the one described in Japanese Utility Model Laid-Open No. Sho 62-121158 is known. In this conventional automatic transmission parking mechanism, as shown in FIG. 4, a cam 02 is attached to the tip of a rod 01 that operates in the axial direction in conjunction with a manual lever of the automatic transmission. A support actuator 03 having a riding slope 03a is provided, and when the cam 02 moves in the axial direction along with the operation of the rod 01, the parking pole 04 moves in the direction orthogonal to the axial direction of the cam 02 and meshes with the parking gear 05. It has a structure that The support actuator 03 is sandwiched between the plate 08 and the case 07 fixed to the case 07 by the bolts 06, and is restricted from moving in the rod axial direction, and is formed on the plate 08. It is fitted into a hole (not shown) and its rotation about the shaft is restricted.

[0003]

[Problems to be solved by the device]

 However, in the above-described conventional device, the plate 08 is used to position the support actuator 03 in the axial direction and the rotational direction, and thus has the problems listed below.

Since the plate 08 and the bolt 06 for mounting the plate 08 are used, the number of parts and the cost are increased. In addition, since the plate 08 is fixed to the case 07 with the bolts 06, the number of assembling steps is increased.

It is necessary to form a tap 07a for fastening the bolt 06 on the case 07, and a hole is formed on the plate 08 with sufficient accuracy to position the support actuator 03. It requires a lot of man-hours, and it takes time and labor to perform the work, resulting in an increase in cost.

The present invention has been made in view of the above-mentioned conventional problems, and an object thereof is to reduce the number of parts, the number of processing steps, the number of assembly steps, and the cost.

[0007]

[Means for Solving the Problems]

 Therefore, in the present invention, the above-described object is achieved by positioning the support actuator by the case and the side cover.

That is, the present invention provides a case for accommodating an automatic transmission, a side cover that closes a side surface of the case, a rod that operates axially in conjunction with a manual lever of the automatic transmission, and a tip of the rod. The cam mounted on the cam, the support actuator having a slope on which the cam rides up, and the axial movement of the cam that accompanies the operation of the rod cause the pawl to park in the direction intersecting the axial direction of the cam. In a parking mechanism for an automatic transmission including a parking pole that meshes with a gear, a case-side holding portion and a cover-side that restrict a movement in the axial direction by sandwiching a support actuator from the above-mentioned case and side cover in the case and side cover. A holding portion, and at least one of the case and the side cover, and a support actuator, A rotation restricting means for restricting rotation of the support actuator about the shaft is provided between the two.

The rotation restricting means includes a groove or a projection formed in an end face of one of the case and the side cover, and a groove or a projection formed on the support actuator to engage with the groove or the projection in a rotation direction. You may make it comprised by the protrusion or groove which does.

[0010]

[Action]

 Before attaching the side cover to the case, the support actuator should be placed at a predetermined position and the rotation regulating means should regulate the rotation of at least one of the case and the side cover. , Positioning in the direction of rotation. In this case, in the mechanism according to claim 2, the protrusion or groove formed on the support actuator is engaged with the groove or protrusion formed by opening the one end surface of the case and the side cover in the rotation direction. Let

After that, a side cover is attached to the case, and at this time, the support actuator is held between the case side holding portion and the cover side holding portion. As a result, the support actuator is restricted in movement in the axial direction and positioned in the axial direction.

[0012]

【Example】

 Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a side view showing a main part of a parking mechanism of an automatic transmission according to an embodiment of the present invention. In FIG. 1, reference numeral 1 is a gear mechanism not shown, which is composed of gears and fastening elements. It is a case that is housed. The opening 1a formed on the side surface of the case 1 is closed by the side cover 2 that is fastened with a bolt (not shown) (see FIG. 2). A parking gear 3 is provided on the output shaft of the transmission mechanism (not shown). A parking pole 4 is disposed near the parking gear 3 and is rotatably supported with respect to the case 1.

That is, one end of the parking pole 4 is rotatably attached to the case 1 by the pin 5, and when the parking pole 4 is rotated in the direction A in the figure, the claw 4 a provided near the other end is provided in the parking gear 3. It meshes with and regulates rotation of the output shaft (not shown). The parking pole 4 is rotationally biased by a spring 6 in the direction opposite to the A direction.

The rotation of the parking pole 4 is operated by a rod 7. The rod 7 has its tip disposed near the other end of the parking pole 4 and is disposed in parallel with the pin 5 as shown in FIG. That is, the rod 7 has a proximal end connected to a manual lever (not shown), while a cam 8 is attached to the distal end of the rod 7, so that when the manual lever is operated to the parking range, the rod 7 moves in the axial direction. The rod 7 interlocks in the direction of arrow B, and the cam 8 pushes up the parking pole 4 accordingly, causing the pawl 4a and the parking gear 3 to mesh with each other. The cam 8 is urged to slide on the rod 7 in the tip direction by a spring 8a.

The cam 8 pushes up the parking pole 4 when the cam 8 rides on the slope 9 a of the support actuator 9. That is, as shown in the cross-sectional view of FIG. 3, the support actuator 9 is provided with a substantially semicircular annular portion 9b, and a radial projection from the outer peripheral surface of the annular portion 9b, which is provided over the entire axial length. The engaging protrusion 9c. Further, a groove 9d is formed inside the annular portion 9b, and the groove 9d constitutes the rod proximal end direction (the direction opposite to the B direction) side of the groove 9d as shown in FIG. A large groove portion 9e of a substantially circular shape having a diameter sufficiently larger than that of the cam 8, the slope 9a rising from the rear end of the large groove portion 9e, and a slope from the slope 9a toward the tip of the rod (direction B). ) Side fan-shaped groove 9f widened in a fan shape and a small groove 9g having an inner diameter slightly larger than the outer diameter of the rod 7 are provided at the bottom of the fan groove 9f. . The engaging projection 9c is formed such that the plate thickness is thinner toward the rod proximal direction (direction opposite to B) and thicker toward the rod distal direction (B direction).

Further, the support actuator 9 is sandwiched between the case 1 and the side cover 2. That is, a mounting hole 1b having an inner surface shape substantially corresponding to the outer surface shape of the annular portion 9b of the support actuator 9 is formed in the vicinity of the periphery of the opening 1a of the case 1, and the innermost mounting hole 1b is formed at the innermost side. A case-side contact surface (case-side holding portion) 1c is formed in the portion, which comes into surface contact with one end surface of the annular portion 9b.

On the other hand, the side cover 2 is also formed with a cover-side contact surface (cover-side holding portion) 2a that comes into surface contact with the other end surface of the annular portion 9b of the support actuator 9. Further, as shown in FIG. 1, the case 1 is formed with a recessed groove 1d which fits into the engagement protrusion 9c of the support actuator 9, and these engagement protrusions 9c and the recessed groove 1d are formed. It constitutes a rotation restricting means.

Next, the procedure for attaching the support actuator 9 will be described. Before attaching the side cover 2 to the case 1, the annular portion 9b of the support actuator 9 is inserted into the attachment hole 1b, and the support actuator 9 is engaged. The fitting protrusion 9c is inserted into the concave groove 1d, and is further pushed until one end surface of the annular portion 9b abuts on or comes close to the case side abutting surface 1c.

After that, the side cover 2 is arranged at a predetermined position with respect to the case 1, and at this time, the cover side contact surface 2 a is brought into contact with the other end surface of the annular portion of the support actuator 9, and in this state, When the cover 2 is attached to the case 1 by bolt fastening, the support actuator 9 is sandwiched between the case side contact surface 1c and the cover side contact surface 2a.

Therefore, the support actuator 9 is regulated in movement in the rotation direction by the engagement between the engagement projection 9c and the concave groove 1d and positioned in the rotation direction, and the contact surfaces 1c and 2a. The movement in the axial direction is restricted by the pinching by, and the axial positioning is performed.

As described above, according to the present embodiment, when mounting the support actuator 9, positioning in the axial direction and positioning in the rotation direction is performed by the case 1 and the side cover 2. Since no plates or bolts have been used as in the past, the number of parts and the number of assembly steps can be reduced, and the cost can be reduced. Furthermore, the case 1 has a tap for fastening the bolt. This eliminates the need for machining or forming a positioning hole in the plate, reducing the number of machining steps, which also has the effect of reducing costs.

It should be noted that, between the engagement protrusion 9c of the support actuator 9 and the concave groove 1d of the case 1, there is some play in the rotational direction unless both are fitted exactly. This play in the rotation direction may cause the support actuator 9 to be displaced in the rotation direction. However, this displacement does not affect the meshing position between the parking gear 3 and the parking pole 4. However, there is no problem in use even if the support actuator 9 rotates within a range that varies within the range of common sense.

Although the embodiment has been described above, the specific configuration is not limited to this embodiment, and even if there is a design change or the like within a range not departing from the gist of the invention, the invention is included. In the embodiment, for example, the mounting hole 1b into which the annular portion 9b of the support actuator 9 is inserted is formed in the case 1, but it may be formed in the side cover 2, or, It may be formed on both the case 1 and the side cover 2. Similarly, the recessed groove 1d that engages with the engagement projection 9c may be formed only on the side cover 2 or across both the case 1 and the side cover 2.

Further, in the embodiment, the engaging protrusion 9c is formed on the support actuator 9 and the concave groove 1d is formed on the case 1. However, a groove corresponding to the concave groove of the embodiment is formed on the support actuator 9. Then, the engaging projections may be formed on either one or both of the case 1 and the side cover 2.

Further, in the embodiment, the case side contact surface 1c and the cover side contact surface 2a, both of which are in surface contact with the support actuator 9, are shown as the case side contact part and the cover side contact part. The present invention is not limited to this, and the support actuator 9 may be sandwiched by line contact or point contact.

[0027]

As described above, in the parking mechanism of the automatic transmission of the present invention, when mounting the support actuator, the axial positioning and the rotational direction positioning are performed by the case and the side cover. However, unlike the conventional method, the plate and the bolt are not used. Therefore, it is possible to reduce the number of parts and the assembling man-hours, and it is possible to reduce the cost. Furthermore, the bolt is fastened to the case. This eliminates the need for the processing of forming the taps and the processing of forming the positioning holes in the plate, which reduces the number of processing steps, which also leads to the effect of cost reduction.

[Brief description of drawings]

FIG. 1 is a side view showing a main part of a parking mechanism of an automatic transmission according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a main part of an example mechanism.

FIG. 3 is a component diagram showing a support actuator of the embodiment mechanism.

FIG. 4 is a cross-sectional view showing a parking mechanism of a conventional automatic transmission.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 case 1c case-side contact surface (case-side holding portion) 1d concave groove (rotation restricting means) 2 side cover 2a cover-side contact surface (cover-side holding portion) 3 parking gear 4 parking pole 4a claw 7 rod 8 cam 9 Support Actuator 9a Slope 9c Engagement Protrusion (Rotation Restriction Means)

Claims (2)

[Scope of utility model registration request] 1. A case for accommodating an automatic transmission, a side cover for closing a side surface of the case, a rod which operates axially in conjunction with a manual lever of the automatic transmission, and a cam mounted on a tip of the rod. A support actuator having an inclined surface on which the cam rides, and a parking pole that moves in a direction intersecting with the axial direction of the cam by the axial movement of the cam due to the operation of the rod so that the pawl meshes with the parking gear. In a parking mechanism of an automatic transmission including: a case-side holding portion and a cover-side holding portion that restrict a movement of the support actuator in the axial direction by sandwiching the support actuator from the axial direction in the case and the side cover; At least one of the side covers,
A parking mechanism for an automatic transmission, characterized in that rotation control means for restricting rotation of the support actuator about the shaft is provided between the support actuator and the support actuator. 2. The rotation restricting means is formed in an end face of one of a case and a side cover, and a groove or a projection formed on the end face of the support actuator is engaged with the groove or the projection in a rotation direction. The parking mechanism of the automatic transmission according to claim 1, wherein the parking mechanism is formed by a protrusion or a groove.