JP2016070288A - Parking device of automatic transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a parking device of an automatic transmission which is simple in structure, can reduce the number of part items and assembling processes, and can reduce costs.SOLUTION: When constituting a parking device of an automatic transmission so that the rotation of a secondary shaft 7 is locked by turning a parking pole 16 in such a manner that a lock claw 16a of the parking pile 16 is engaged with a parking gear 17 fixed to the secondary shaft (power transmission shaft) 7 by shift-operating a shift lever to a parking range, an extension part 11b is formed at a bearing retainer 11 which supports a bearing 12 of the secondary shaft 7 so as to extend to the parking rod 15 side from a bearing center side, and a cam guide part 23 which guides a cam 19 is formed at the extension part 11b so as to turn the parking pole 16 accompanied by the movement of the cam 19 to a parking position.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a parking device for an automatic transmission configured to lock a power transmission shaft to wheels by shifting a shift lever to a parking range.

  In this type of parking device, when the shift lever is operated to shift to the parking range, the parking rod enters the housing recess formed in the transmission case, and the cam attached to the parking rod with the entry moves the parking pole. The transmission shaft is configured to lock the transmission shaft by rotating and engaging the parking pawl of the parking pole with the parking gear mounted on the transmission shaft.

  Incidentally, a parking support made of sheet metal, for example, is disposed at the entrance of the housing recess, and the parking support guides the cam so that the parking pole rotates when the cam rides on the parking support. (For example, refer to Patent Document 1).

JP 2010-228604 A

  In the conventional structure, for example, a housing recess is formed in a transmission case made of aluminum alloy, a parking support is disposed at the entrance of the housing recess, and the support is bolted and fixed to the transmission case. Therefore, there is a problem that the structure is complicated, the number of parts and the number of assembly steps are large, and the cost is high.

  The present invention has been made in view of the above-described conventional situation, and it is an object of the present invention to provide a parking device for an automatic transmission that has a simple structure, can reduce the number of parts and assembly steps, and can reduce costs.

According to the present invention, when the shift lever is shifted to the parking range, the parking rod having a cam is disposed near the power transmission shaft that transmits power to the wheels, and the cam of the parking rod is moved to the parking pole. In a parking device for an automatic transmission configured to lock the rotation of the power transmission shaft by rotating the locking claw so as to mesh with a parking gear fixed to the power transmission shaft,
An extension portion is formed on the bearing retainer that supports the bearing that supports the power transmission shaft and is fixed to the transmission case so as to extend from the bearing center side to the parking rod side, and the cam is provided on the extension portion. A cam guide portion that guides the cam is formed so that the parking pole is rotated in accordance with the movement to the parking position.

  According to the present invention, the extension is formed in the bearing retainer that supports the bearing of the power transmission shaft, and the cam guide portion that guides the cam of the parking rod to the extension so that the cam rotates the parking pole. Formed. The bearing retainer is made of, for example, iron so as to have sufficient strength and hardness to support the bearing. Therefore, the cam guide portion does not require a parking support as in the prior art, and is separated from the cam. Since the cam can be guided to rotate the parking pole while supporting the load, the number of parts and the number of assembling steps can be reduced, and the cost can be reduced.

It is a side view of the automatic transmission provided with the parking apparatus which concerns on Example 1 of this invention. It is a perspective view of the parking device. It is a side view of the parking device. It is a cross-sectional side view (IV-IV sectional view taken on the line of FIG. 3) of the cam guide part of the parking apparatus. It is a top view of the detent plate part of the said parking apparatus.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

1 to 5 are diagrams for explaining a parking device for an automatic transmission according to a first embodiment of the present invention.

In the figure, reference numeral 1 denotes an automatic transmission mounted on an automobile. This automatic transmission 1 includes a V-belt type continuously variable transmission mechanism 3 that continuously outputs engine rotation and outputs it in a transmission case 2, and the output rotation of the continuously variable transmission mechanism 3 is a differential gear mechanism. And an output shaft 4 that is transmitted via a schematic structure. The rotation of the output shaft 4 is transmitted to left and right wheels (not shown).
The V-belt type continuously variable transmission mechanism 3 includes a primary shaft 6 to which rotation of the crankshaft 5 is transmitted, a secondary shaft 7 disposed in parallel to the primary shaft 6, a primary sheave 8 of the primary shaft 6, A V belt 10 wound around a secondary sheave 9 of the secondary shaft 7;

Here, the primary shaft 6 and the secondary shaft 7 are rotatably supported by bearings, and the respective bearings are supported by bearing retainers. The bearing retainer is bolted to the transmission case 2.

The bearing 12 of the secondary shaft 7 has a structure in which a rolling element 12c is interposed between the outer race 12a and the inner race 12b. The bearing retainer 11 for supporting the bearing 12 is made of iron and has a substantially flat plate shape. The bearing retainer 11a has a circular support hole 11a 'for fixing and supporting the outer race 12a, and the bearing support 11a includes the bearing support 11a. 12 and an extension portion 11b extending radially outward.

Base side bolt holes 11c and 11c and a knock pin hole 11d are formed on the outer peripheral edge of the bearing support portion 11a. Further, tip side bolt holes 11e, 11e and a knock pin hole 11f are formed at the lower edge of the tip end portion of the extension portion 11b. The tip side bolt hole 11e and the base side bolt hole 11c are fastened and fixed to the transmission case 2 by bolts.

In the transmission case 2, a parking device 13 that locks the secondary shaft (transmission shaft to the wheel) 7 when a shift lever (not shown) is shifted to the parking range is accommodated.

The parking device 13 is rotatably supported by the transmission case 2 and is pivotally driven by the shift lever via a relay lever 14a, and a detent plate 14b fixed to the control rod 14. The parking rod 15 engaged with the engagement hole 14c, the parking pole 16 rotatably supported by the bearing retainer 11 near the bearing support portion 11a, and the locking claw 16a of the parking pole 16 are engaged and disengaged. The parking gear 17 is provided. Reference numeral 18 denotes an elastic support plate fixed to the bearing retainer 11 by bolting. The elastic support plate 18 has a locking roller 18a disposed at the tip of the elastic support plate 18 in any range of the detent plate 14b. The detent plate 14b is held at an angular position corresponding to the range by engaging with the engaging recess 14d corresponding to the above.

The parking pole 16 is formed of a substantially plate-shaped member, and a bent portion 16b is pivotally supported on the bearing retainer 11 by a rotation pin 16d. Further, the locking pawl 16a is formed at the tip of the parking pole 16, and the driven portion 16c driven by a cam 19 (to be described later) of the parking rod 15 is formed at the base. Reference numeral 21 denotes a return spring that urges the parking pole 16 in a direction in which the locking claw 16a and the locking teeth 17a of the parking gear 17 are unlocked, that is, in a parking lock releasing direction. It is a cover member of the parking pole 16.

The parking rod 15 has a shape obtained by bending a round bar into a substantially L shape, and includes a base portion 15a that engages with an engagement hole 14c of the detent plate 14b, and a main body portion 15b that extends toward the bearing retainer 11 side. Have. The cam 19 is attached to the middle portion of the main body portion 15b so as to be movable forward and backward in the axial direction of the main body portion 15b and urged in the forward direction by a spring 20, and is formed at the tip of the main body portion 15b. Abuts against the stopper portion 15c. The cam 19 has a truncated cone shape having a large diameter portion 19a and a tapered portion 19b.

The front end portion of the main body portion 15 b is inserted into a through hole 11 g formed in the extension portion 11 b of the bearing retainer 11. The through hole 11g passes through the extension portion 11b in the axial direction of the main body portion 15b of the parking rod 15. A semicircular portion of the inner peripheral surface of the through hole 11g located on the opposite side of the driven portion 16c of the parking pole 16 is a cam guide portion 23. The cam guide part 23 has an inclined part 23a on the entrance side and a straight part 23b following the inclined part 23a, and is subjected to a treatment for improving wear resistance by induction hardening or the like. Further, the end surface 23c of the cam guide 23 facing the driven portion 16c of the parking pole 16 serves as a stopper for regulating the angular position when the parking pole 16 is unlocked.

An idler shaft support 11h is integrally formed with the extension 11b formed on the bearing retainer 11.
In a state where the shift lever is moved to a range other than the parking range, the cam 19 of the parking rod 15 has a large diameter portion 19a at the entrance of the cam guide portion 23 as shown by a two-dot chain line in FIG. Therefore, the parking pole 16 is in a position rotated clockwise as indicated by a two-dot chain line in FIG. 3, and its locking claw 16 a is engaged with the locking tooth 17 a of the parking gear 17. The parking brake is released.

When the shift lever is shifted to the parking range, the control rod 14 rotates the detent plate 14b via the relay lever 14a, so that the cam 19 of the parking rod 15 moves through the through hole 11g as shown by the solid line in FIG. The large diameter portion 19a of the cam 19 rides on the straight portion 23b of the cam guide portion 23, and the driven portion 16c of the parking pole 16 is pressed and moved. As a result, the parking pole 16 is slightly rotated counterclockwise as shown by a solid line in FIG. 3, the locking claw 16a is locked to the locking tooth 17a of the parking gear 17, the parking brake is activated, and the secondary The rotation of the shaft 7 is locked.

According to the present embodiment, the extension portion 11b is formed in the iron bearing retainer 11 that supports the bearing 12 of the secondary shaft 7 as the power transmission shaft, and the cam 19 of the parking rod 15 is attached to the extension portion 11b. A cam guide portion 23 for guiding the parking pole 16 so that the parking pole 16 rotates is formed. The bearing retainer 11 is made of iron so as to have sufficient strength and hardness to support the bearing 12. Therefore, the cam guide portion 23 does not require a parking support as in the prior art, and the cam 19 Since the cam 19 can be guided to rotate the parking pole 16 while supporting the load from the vehicle, the number of parts and the number of assembling steps can be reduced, and the cost can be reduced.

Further, since the bearing retainer 11 is made of iron, as described above, the cam guide portion 23 can be subjected to heat treatment such as induction hardening so that the wear resistance can be improved. It is possible to suppress cracking, settling, and wear of the cam guide portion 23 due to sliding.

Further, the base side bolt holes 11c and 11c formed in the bearing support portion 11a of the bearing retainer 11 and the extension portion 11b are formed at portions away from the bearing support portion 11a radially outward of the bearing 12. Since the front end bolt holes 11e and 11e are bolted and fixed, the bolt tightening interval can be widened and the support rigidity of the bearing retainer 11 can be increased accordingly.

Further, the idler shaft support portion 11h can be integrally formed with the extension portion 11b provided on the bearing retainer 11, and the number of parts can be reduced from this point.

Furthermore, an oil path can be provided in the extension 11b of the bearing retainer 11, and the transmission case and the oil of each shaft can be delivered via the oil path. In such a case, an oil passage that has conventionally been constituted by separate parts such as tube piping can be eliminated, and the number of parts, assembly man-hours, and cost can be further reduced.

1 Automatic transmission 2 Transmission case 7 Secondary shaft (power transmission shaft)
DESCRIPTION OF SYMBOLS 11 Bearing retainer 11b Extension part 12 Bearing 13 Parking apparatus 15 Parking rod 16 Parking pole 16a Locking claw 17 Parking gear 19 Cam 23 Cam guide part

Claims (1)

When the shift lever is shifted to the parking range, the parking rod that is disposed near the power transmission shaft that transmits power to the wheels and has a cam moves to the parking position, and the cam of the parking rod moves the parking pole to the parking pole. In the automatic transmission parking device configured to lock the rotation of the power transmission shaft by rotating the locking claw so as to mesh with a parking gear fixed to the power transmission shaft,
An extension portion is formed on the bearing retainer that supports the bearing that supports the power transmission shaft and is fixed to the transmission case so as to extend from the bearing center side to the parking rod side, and the cam is provided on the extension portion. A parking device for an automatic transmission, characterized in that a cam guide portion is formed for guiding the cam so that the parking pole is rotated in accordance with the movement of the parking pole to the parking position.

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