JPH072665U - Guide structure for parking lock mechanism for automobiles - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a parking lock mechanism for an automobile, which has a simple structure and can be easily molded and assembled. [Structure] The mission case 1 is composed of a case body 2 and a case cover 4 that closes an opening 3 of the case body 2. A lock cam 38 is provided in the mission case 1 to engage the parking gear 21 with the wheels to lock the same. A guide member 52 for guiding the lock cam 38 in the cam engaging direction is integrally provided on the inner surface side of the case cover 4 so as to project. The protruding end 53 of the guide member 52 is flush with the joint surface 50 of the case cover 4 on the case body 2 side, or the joint surface 50.
The same as above is located inside the case cover 4.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 According to the invention, in a parking lock mechanism for an automobile, a lock cam is provided which is engaged with a parking gear side interlocking with a wheel and locks the parking gear side, and the lock cam is guided in the cam engaging direction. The present invention relates to a guide structure provided with a guide member.

[0002]

[Prior art]

 As a guide structure of the parking lock mechanism, there is a guide structure disclosed in Japanese Utility Model Laid-Open No. 61-22958.

[0003] According to this, in the mission case, a parking gear that interlocks with the traveling wheels and a lock cam that engages with and disengages from the parking gear side are accommodated. A guide member for guiding the lock cam is provided so as to project on the inner surface side of the mission case.

Then, the parking gear side is locked by the cam engagement, whereby the wheels are locked and the parked automobile is kept in a stopped state.

[0005]

[Problems to be solved by the device]

 By the way, in the above-mentioned conventional structure, the guide member is provided separately from the mission case, and the guide member is screwed to the boss portion projecting on the inner surface of the mission case by a bolt.

Therefore, there is a problem that the number of parts of the parking lock mechanism increases due to the guide member, the bolt, and the like, the structure thereof becomes complicated, and the molding and assembling work becomes complicated.

Therefore, it is conceivable to integrally form the guide member on the inner surface of the mission case.

However, if they are simply integrally molded, when attempting to machine the mission case, the processing tools may interfere with the guide member, which complicates the mission case molding operation.

[0009]

[The purpose of the device]

 The present invention has been made in view of the above circumstances, and an object thereof is to provide a parking lock mechanism for an automobile, which has a simple structure and can be easily formed and assembled.

[0010]

[Means for Solving the Problems]

 A feature of the present invention for achieving the above object is that a mission case is composed of a case body and a case cover that closes an opening of the case body, and a cam gear is provided on a parking gear side that interlocks with a vehicle wheel. When a lock cam for locking the lock cam is provided in the mission case, a guide member for guiding the lock cam in the cam engaging direction is integrally projected on the inner surface side of the case cover. The protruding end of this guide member is flush with the end surface of the case cover on the case body side, or is located inside the case cover above the end surface.

[0011]

[Work]

 The operation of the above configuration is as follows.

The terms in parentheses below correspond to the terms in the claims for utility model registration.

The mission case 1 is composed of a case body 2 and a case cover 4 that closes an opening 3 of the case body 2, and a lock cam that engages a cam on the side of the parking gear 21 that interlocks with the wheels to lock the same. When 38 is provided in the mission case 1, a guide member 52 that guides the lock cam 38 in the cam engaging direction is integrally provided on the inner surface side of the case cover 4. Therefore, since the above-mentioned guide member 52 is integrally formed on the inner surface side of the case cover 4, the number of parts is reduced.

Further, the protruding end 53 of the guide member 52 is flush with the joint surface (end surface) 50 of the case cover 4 on the case body 2 side, or is the same as the case cover 4 above the joint surface (end surface) 50. It is located inside. Therefore, when the case cover 4 is molded, the processing tool is prevented from interfering with the projecting end 53 of the guide member 52 when the joining surface (end surface) 50 on the case body 2 side is machined. To be done.

[0015]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings.

Reference numeral T in the drawing denotes a power transmission device of the automobile, 1 denotes a mission case, and an arrow F r in FIG. 1 indicates the front of the automobile. Further, the left and right described below means the direction toward the front (that is, the direction toward FIGS. 2 and 3).

The mission case 1 is composed of a case body 2 that forms a front portion of the mission case 1 and a case cover 4 that opens and closes a rear opening 3 of the case body 2. The case cover 4 with the opening 3 closed is detachably screwed to the rear end surface 5 of the case body 2 with a bolt 6. Further, a partition wall 7 is integrally formed in the front and rear part of the case body 2.

In the transmission case 1, an input shaft 8 interlocked with the engine and an output shaft 10 interlocked with the input shaft 8 via a friction clutch 9 are coaxially supported by bearings 11 and 12. There is. An intermediate shaft 13 is supported above the output shaft 10 in parallel with the output shaft 10 by a bearing 14, and the intermediate shaft 13 is interlocked with wheels (not shown). The drive gear 15 is fitted to the output shaft 10 by a spline 16, the driven gear 17 is fitted to the intermediate shaft 13 by a spline 18, and the drive gear 15 and the driven gear 17 mesh with each other.

When the friction clutch 9 is engaged, the power of the engine is transmitted to the wheels via the output shaft 10, the drive gear 15, the driven gear 17, and the intermediate shaft 13, so that the vehicle can run. It

In the above configuration, when the vehicle is parked, the parking lock mechanism 20 is provided at that position so that the vehicle can be braked.

The parking lock mechanism 20 has a parking gear 21, and the parking gear 21 is coaxially formed with the drive gear 15 and integrally formed on the side surface of the drive gear 15. Further, below the parking gear 21, a parking lock pole 23 is pivotally supported by a pivot shaft 24 so as to be vertically rotatable with respect to the mission case 1.

When the parking lock pole 23 is rotated upward, the engaging portion 25 formed at the rotating end of the parking lock pole 23 engages with the tooth groove of the parking gear 21 in a disengaged state. Has become. With this engagement, as the parking gear 21 is locked, the wheels are locked via the drive gear 15, the driven gear 17, and the intermediate shaft 13, and the parked automobile remains in the stopped state. It is being held.

Further, a spring 26 is provided which urges the engaging portion 25 of the parking lock pole 23 downward so as to disengage from the parking gear 21. Then, in the free state of the parking gear 21, the engaging portion 25 of the parking gear 21 is disengaged from the parking gear 21.

A rotary arm 28 is pivotally supported on the mission case 1 by a pivot shaft 29 so as to be rotatable left and right, and a positioning arm 30 is integrally formed on the rotary arm 28. A plurality of engaging grooves 31 are formed in the rotating end of the positioning arm 30 in the circumferential direction of the pivot shaft 29. An engagement body 33 that is elastically engaged with any one of the engagement grooves 31 by an urging force of a spring 32 is attached to the mission case 1.

An operating rod 34, one end of which is connected to the positioning arm 30 and the other end of which extends to the driver side, is provided. By operating the operating rod 34, the positioning arm 30 is rotated, and accordingly, the above-mentioned The rotating arm 28 can be rotated.

Inside the mission case 1, below the engaging portion 25 of the parking lock pole 23, a cam support shaft 37 extending in the left-right direction is provided. The right end of the cam support shaft 37 is connected to the rotating arm 28, and a frustoconical lock cam 38 is externally fitted to the left end of the cam support shaft 37 so as to be slidable in the axial direction of the cam support shaft 37.

A boss 39 is attached to the left end of the cam support shaft 37, and a spring 40 is interposed between the boss 39 and the lock cam 38. The spring 40 directs the lock cam 38 to the right. Is being urged. Stopper pins 41 are attached to the left and right middle portions of the cam support shaft 37, and the stopper pins 41 prevent the lock cam 38 from moving rightward beyond a predetermined size.

A support shaft 43 that supports the lower surface on the right end side of the cam support shaft 37 is provided. The support shaft 43 has a cylindrical shape as a whole, the front end of which is fitted into a support hole 44 formed in the case body 2 and fixed by a retaining pin 45, and the rear end of which is a support hole formed in the case cover 4. It is inserted into and removed from the support 46 and is supported. In this case, the support hole 46 is formed in the cylindrical boss portion 47 formed on the inner surface side of the case cover 4.

A guide groove 48 extending in the left-right direction is formed on the upper surface of the bearing shaft 43 in the front-rear midway portion. The guide groove 48 has a semicircular shape that opens upward, and the cam support shaft 37 is formed on the inner surface thereof. The right end side of is supported so that it can slide left and right.

While the vehicle is running, the operating rod 34 elastically moves to the right, so that the positioning arm 30, the rotating arm 28, and the cam support shaft 37 are moved to the position shown in FIG. It is located where indicated by the middle two-dot chain line. As a result, the lock cam 38 is disengaged to the left from the rotating end of the parking lock pole 23, and the rotating end of the parking lock pole 23 is located on the right end side upper surface of the cam support shaft 37 in the guide groove 48. The springs 26 are pressed against each other by the biasing force of the springs 26, whereby the engaging portion 25 is disengaged downward from the parking gear 21. In other words, the wheels are unlocked.

When the driver pulls the operating rod 34 to the left in an attempt to park the vehicle, the positioning arm 30, the rotating arm 28, and the cam support shaft 37 are correspondingly moved by the solid line in FIG. 3 and arrow A. The position changes as shown by, and the lock cam 38 approaches the rotating end of the parking lock pole 23.

Further, when the operating lever 34 is pulled to the left, the positioning arm 30, the pivot arm 28, and the cam support shaft 37 are indicated by the alternate long and short dash line and arrow B in FIG. The position changes to.

Then, the lock cam 38 is pushed to the right by the cam support shaft 37 via the spring 40, and the lock cam 38 rides on the guide groove 48. As a result, the lifted lock cam 38 is cammed to the pivot end of the parking lock pole 23. When engaged, the parking lock pole 23 is rotated upward as indicated by the alternate long and short dash line and arrow C in FIG. Then, the engaging portion 25 of the parking lock pole 23 engages with the tooth groove of the parking gear 21, and the parking gear 21 is locked, that is, the wheels interlocking with the parking gear 21 are locked, and the vehicle in the parked state is locked. It is braked while it is stopped.

As described above, when the lock cam 38 is pushed to the right by the cam support shaft 37 via the spring 40 and the parking lock pole 23 is rotated upward accordingly, the engaging portion 25 of the parking lock pole 23 is moved. If it comes into contact with the tooth tips of the parking gear 21, then the lock cam 38 is prevented from riding on the guide groove 48.

After that, when the parking gear 21 rotates a little and its tooth groove matches the engaging portion 25, the engaging portion 25 engages with the tooth groove of the parking gear 21 there. Here, the parking gear 21 is to be locked as described above.

If the driver moves the operating rod 34 to the right to position the positioning arm 30, the rotating arm 28, and the cam support shaft 37 at the positions indicated by the alternate long and short dash line in FIG. The parking gear 21 is unlocked, that is, the wheels are unlocked and the original state is restored.

In the above case, the lock cam 38 reciprocates left and right substantially parallel to the virtual plane 51 passing through the joint surface 50 of the case body 2 and the case cover 4 to rotate the parking lock pole 23 up and down. ing.

A guide member 52 that slides the lock cam 38 and guides the lock cam 38 left and right along the virtual plane 51 is integrally provided on the inner surface of the case cover 4 so as to project. The guide member 52 has a circular arc shape protruding downward along the left-right reciprocating movement locus of the lock cam 38, and the right end thereof is integrated with the boss portion 47.

The front ends of the guide member 52 and the projecting ends 53 of the boss 47 are flush with each other, and are flush with the joint surface 50, which is the end face of the case cover 4 on the case body 2 side, that is, the case. At the time of molding the cover 4, the joint surface 50 and each protruding end 53 are mechanically processed at the same time.

The guide member 52 has a rib shape and reinforces the case cover 4 together with the boss 47 and other ribs 54.

Another guide member 55 is projectingly provided on the inner surface side of the case cover 4. The projecting end of the internal member 55 enters the case body 2, and the side surfaces of the vertically rotating parking lock pole 23 are brought into sliding contact with each other to position the parking lock pole 23 in the front-rear direction.

In FIG. 1, the input shaft 8 has an oil hole 56 on its axis, and the oil 57 sent from the oil pump passes through the oil hole 56, the spline 16, and the bearing 12 in order, and the The sliding contact portions of the shaft support shaft 37 and the guide groove 48, the lock cam 38 and the guide member 52, and the parking lock pole 23 and the guide member 55 are lubricated.

The protruding end 53 of the guide member 52 may be located inside the case cover 4 above the joint surface 50 of the case cover 4.

[0044]

[Effect of device]

 According to this invention, the mission case is composed of a case body and a case cover that closes the opening of the case body, and the lock cam that engages with the parking gear side interlocking with the wheels to lock it is When provided in the mission case, a guide member that guides the lock cam in the cam engaging direction is integrally provided on the inner surface side of the case cover.

Therefore, since the guide member is integrally molded on the inner surface side of the case cover, the number of parts is reduced. Therefore, the structure of the parking lock mechanism is simplified, and its molding and assembly are facilitated.

Further, the protruding end of the guide member is flush with the end face of the case cover on the case body side, or is located inside the case cover above the end face. Therefore, when the end face of the case main body side is machined during molding of the case cover, the processing tool is prevented from interfering with the protruding end of the guide member.

Therefore, since the protruding end of the guide member does not interfere with the processing tool as described above, the case cover can be easily molded, that is, the parking lock mechanism can be easily molded also in this respect. Becomes

[Brief description of drawings]

1 is a cross-sectional view taken along the line 1-1 of FIG.

FIG. 2 is a rear view of the mission case.

FIG. 3 is a partially enlarged sectional view of FIG.

FIG. 4 is a view of the case cover as viewed from the inside.

[Explanation of symbols]

 1 Mission Case 2 Case Body 3 Opening 4 Case Cover 7 Partition Wall 20 Parking Lock Mechanism 21 Parking Gear 23 Parking Lock Pole 37 Cam Support Shaft 38 Lock Cam 43 Bearing Shaft 47 Boss 48 Guide Groove 50 Joining Surface (End Face) 51 Virtual Plane 52 Guide member 53 Projecting end T Power transmission device

Claims (1)

[Scope of utility model registration request] 1. A mission case is composed of a case body having an opening at one end and a case cover that opens and closes the opening of the case body, and a parking gear interlocking with wheels in the mission case, A lock cam that reciprocates substantially parallel to an imaginary plane passing through the joint surface between the case body and the case cover and engages and disengages with the parking gear side is housed, and the parking gear side is locked by the cam engagement. In the guide structure of the parking lock mechanism for an automobile, the guide member for guiding the lock cam along the virtual plane is integrally provided on the inner surface side of the case cover, and the protruding end of the guide member is provided. Vehicles that are flush with the end surface of the case cover on the case body side or the same as the end surface inside the case cover Guide structure of the parking lock mechanism.