JP2007205578A - Driving device with parking mechanism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To offer a driving device with a parking mechanism wherein the parking mechanism can be installed inside a case even if there is no aperture in the case which is plugged with a lid member. <P>SOLUTION: In the driving device A1 with the parking mechanism which keeps the 1st case coupled with a 2nd case and the parking mechanism 4 which regulates a rotation of a rotation member disposed in the 1st case, the 1st case is provided with an aperture 1A which is formed by a mold release of the mold forming the 1st case 1 from the 1st case 1 after mold finishing, and the parking mechanism 4 is arranged inside the 1st case 1 via the opening 1A. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a drive mechanism with a parking mechanism in which a parking mechanism is arranged inside a case.

  In an automatic transmission for a vehicle, a parking mechanism for preventing the rotation member from rotating when the vehicle stops is provided, and an example thereof is Patent Document 1 (Japanese Patent Laid-Open No. 11-37291) described below. It is described in. In Patent Document 1, a transmission case and a rear extension are coupled by a bolt, and a transmission mechanism is housed inside the transmission case. A parking gear is provided on the output shaft of the transmission mechanism. Further, a parking mechanism is laid out at a position corresponding to the parking gear, specifically, on the transmission case side. This parking mechanism has a parking pole, a rod, a support actuator, a cam and the like that mesh with the parking gear. An opening is formed in the lower part of the transmission case. As a technique related to the parking mechanism, in addition to the above-mentioned Patent Document 1, Patent Document 2 (CD-ROM on which the contents of Japanese Utility Model Application No. 5-21435 (Japanese Utility Model Publication No. 6-78132)) are recorded. Are known.

Japanese Patent Laid-Open No. 11-37291 (page 3, FIGS. 1 to 4) CD-ROM on which the contents of Japanese Utility Model Application No. 5-21435 (Japanese Utility Model Application Publication No. 6-78132) are recorded

  In the above Patent Document 1, when the parking mechanism is attached to the inside of the transmission case, it can be considered that the parking mechanism is attached from an opening formed in the lower part of the transmission case. This opening is considered to be closed by a lid member such as an oil pan.

  By the way, it is conceivable that an opening that is closed by a lid member is not provided in the lower part of the transmission case. However, in such a case, it is unclear how the parking mechanism is attached to the case. Therefore, it is difficult to configure a drive device with a parking mechanism in which a parking mechanism is attached inside a case that does not have an opening that is closed by a lid member.

  The present invention has been made against the background of the above circumstances, and an object thereof is to provide a drive device with a parking mechanism capable of attaching a parking mechanism inside a case that does not have an opening that is closed by a lid member. Yes.

  In order to achieve the above object, according to the first aspect of the present invention, the first case and the second case are coupled, and a parking mechanism for restricting the rotation of the rotating member is disposed inside the first case. In the drive mechanism with a parking mechanism, the first case is provided with an opening formed by releasing a mold for molding the first case from the molded first case. The parking mechanism is arranged inside the first case through the opening.

  According to a second aspect of the present invention, in addition to the configuration of the first aspect, the first case and the second case are in contact with the other case between the first case and the second case. The parking mechanism has a parking pawl, and rotates the parking pawl by contacting the other case between the first case and the second case. A holding member is provided to hold the first case and the second case, and when the first case and the second case are coupled, the positioning member contacts the other member and the first case and the second case. Are positioned, and thereafter, the holding member comes into contact with the other case and the parking pole is rotatably held.

  According to the first aspect of the present invention, in the step of forming the first case, when the mold for forming the first case is released from the first case after the forming, the opening is formed in the first case. Is formed. The parking mechanism can be disposed in the first case using this opening. Therefore, the parking mechanism can be mounted in the first case even when there is no opening or the like for mounting the lid member on the first case.

  According to the invention of claim 2, in addition to obtaining the same effect as that of the invention of claim 1, when the first case and the second case are coupled, the first case is first made by the positioning member. After positioning the case and the second case, the holding member comes into contact with the other case, and the parking pole can be rotatably held by the first case and the second case. Therefore, it can suppress that a holding member contacts parts other than the predetermined part of the other case, and the other case is damaged, and can maintain the operation | movement of a parking pole favorably.

  Next, an embodiment of the present invention will be described with reference to the accompanying drawings. The driving device A1 with a parking mechanism shown in FIGS. 1 and 2 is disposed, for example, in a power transmission path between a driving force source (not shown) and wheels (not shown) of the vehicle. Hereinafter, the drive device A1 with a parking mechanism is abbreviated as a unit A1. The unit A1 has a case 1 and a housing 2. The case 1 has an end face 1B surrounding the opening 1A, and the housing 2 has an end face 2B surrounding the opening 2A. And the case 1 and the housing 2 are being fixed with the screw member (not shown) etc. in the state which the end surface 1B and the end surface 2B contacted. In a state where the case 1 and the housing 2 are coupled and fixed, the inside of the case 1 and the inside of the housing 2 communicate with each other with the openings 1A and 2A as boundaries.

  Further, the case 1 is provided with a hole 1C that opens to the end face 1B, and the housing 2 is provided with a hole 2C that opens to the end face 2B. And the knock pin 32 is arrange | positioned over both the hole 1C and the hole 2C. The knock pin 32 positions the case 1 and the housing 2 in a direction parallel to the end surfaces 1B and 2B.

  On the other hand, as shown in FIG. 2, a transmission mechanism (not shown) and a rotating shaft 3 are provided inside the case 1, and the power of the driving force source is applied to the rotating shaft 3 via the transmission mechanism. It is configured to be transmitted. A parking mechanism 4 that restricts the rotation of the rotating shaft 3 is disposed inside the case 1 and the housing 2, mainly inside the case 1.

  Hereinafter, the configuration of the parking mechanism 4 will be described. First, a parking gear 5 that rotates integrally with the rotary shaft 3 is provided, and on the outer periphery of the parking gear 5, concave portions 6 and convex portions 7 are alternately formed in the circumferential direction. In other words, the parking gear 5 has external teeth composed of the concave portion 6 and the convex portion 7. Further, a parking pole 8 is provided, and the parking pole 8 is supported so as to be rotatable about a pole shaft 9.

  The case 1 is provided with a holding surface 50. The holding surface 50 is formed in parallel with the end surface 1B and is disposed facing the opening 1A. Further, a hole 33 is formed in the holding surface 50. On the other hand, the housing 2 is provided with a holding surface 51. The holding surface 51 is formed in parallel with the end surface 2B, and is disposed facing the opening 2A. Further, a hole 34 is formed in the holding surface 51. The pole shaft 9 is inserted into both the holes 33 and 34.

  In addition, when the case 1 and the housing 2 are fixed, a part of the parking pole 8 is held between the holding surface 50 and the holding surface 51. Here, the distance L3 between the holding surface 50 and the holding surface 51 is set to be slightly larger than the thickness t1 of the parking pole 8. Thus, the parking pole 8 is rotatably supported by the case 1 and the housing 2 through the pole shaft 9. Note that a chamfer 35 is provided at the entrance of the hole 34.

  The case 1 is provided with a pin 10, and a torsion coil spring 11 is attached to the pin 10. One end of the torsion coil spring 11 is in contact with the case 1, and the other end of the torsion coil spring 11 is in contact with the parking pole 8. The parking pole 8 is urged by the elastic force of the torsion coil spring 11 in the clockwise direction in FIG.

  A contact portion 12 is formed on the free end side of the parking pole 8. Further, a pawl portion 13 is formed between the pole shaft 9 and the contact portion 12 in the parking pole 8. Further, the case 1 is integrally provided with a holding portion 15, and a lock sleeve 16 is fitted into the holding portion 15. As shown in FIG. 2, the holding portion 15 is configured in an arc shape within a predetermined angle range, that is, a substantially C shape, and has a notch portion 16 </ b> B. As shown in FIG. 1, the holding portion 15, the end surface 15 </ b> A facing the housing 2, the lock sleeve 16, the end surface 16 </ b> A facing the housing 2, and the end surface 1 </ b> B of the case 1 are substantially in the same plane. Is placed on top. A guide hole 17 is formed in the lock sleeve 16, and a guide surface 18 that extends in the axial direction of the rotary shaft 3 and has an arc shape is formed on the inner periphery of the guide hole 17. .

  Further, an inclined surface 19 is continuous at a position closer to the housing 2 than the guide surface 18 on the inner periphery of the guide hole 17. Further, the holding surface 20 is continuous at a position closer to the housing 2 than the inclined surface 19. The holding surface 20 is disposed below the contact portion 12 of the parking pole 8. A stopper plate 37 is fixed to the case 1 by a screw member 36. The stopper plate 37 contacts the end faces 15A and 16A to position the case 1 and the lock sleeve 16. A hole 38 is formed in the stopper plate 37.

  Further, as shown in FIG. 1, a shaft 21 is rotatably attached to the case 1. The shaft 21 rotates in response to the shift position switching. By changing the shift position, the control range of the transmission gear ratio of the transmission mechanism is changed. In this embodiment, for example, a P (parking) position, an R (reverse) position, an N (neutral) position, a D (drive) position, a B (brake) position, and the like can be switched to each other.

  A lever 22 is attached to the shaft 21. The lever 22 is bent into a V shape, and the shaft 21 is connected to the bent portion. A moderation mountain 23 is formed at one end of the lever 22. This moderation mountain 23 has a recess corresponding to each shift position. In addition, a lock pin 24 is provided inside the case 1 so as to be engageable and disengageable with respect to these recesses.

  Further, a parking rod 25 is connected to the end of the lever 22 opposite to the moderation mountain 23. The parking rod 25 and the lever 22 are coupled so as to be relatively rotatable, and a stopper 26 is formed at the free end of the parking rod 25. A cam member 27 is attached to the parking rod 25 between the stopper 26 and a connecting portion between the parking rod 25 and the lever 22. The cam member 27 and the parking rod 25 are relatively movable in the length direction of the parking rod 25.

  Furthermore, the parking rod 25 is provided with a caulking portion 30, and a compression spring 31 is interposed between the caulking portion 30 and the cam member 27. The cam member 27 is pressed toward the stopper 26 by the elastic force of the compression spring 31. The case 1 is not provided with an opening for attaching a lid member such as an oil pan.

  Next, the operation of the unit A1 mounted on the vehicle will be described. For example, when the D position is selected as the shift position, the lever 22 and the parking rod 25 stop at the position indicated by the two-dot chain line in FIG. In this state, the cam member 27 is in contact with the guide surface 18, and the cam member 27 and the parking pole 8 are not in contact. Accordingly, the engagement between the pawl portion 13 of the parking pole 8 and the parking gear 5 is released, and the rotation of the rotating shaft 3 is allowed.

  On the other hand, when the shift position is switched from the position other than the P position to the P position, the shaft 21 and the lever 22 rotate counterclockwise in FIG. Then, as the lever 22 rotates, the parking rod 25 moves to the right in FIG.

  Then, the cam member 27 moves from the guide surface 18 to the inclined surface 19 and moves along the inclined surface 19. At this time, if the concave portion 6 and the pawl portion 13 of the parking pole 8 are in the same phase in the circumferential direction of the parking gear 5, the parking pole 8 pressed by the cam member 27 is counterclockwise in FIG. While rotating, the tip of the parking rod 25 enters the hole 38, and the cam member 27 is held by the holding surface 20. In this way, when the claw portion 13 enters the recess 6 as shown in FIG. 2, the parking pole 8 and the parking gear 5 are engaged, and the parking gear 5 and the rotating shaft 3 are prevented from rotating. .

  In the parking mechanism 4, the load transmitted from the parking gear 5 to the parking pole 8 is transmitted to the holding portion 15 via the cam member 27 and the lock sleeve 16. The load transmitted from the parking gear 5 to the parking pole 8 is a large load that occurs when the parking gear 5 and the parking pole 8 mesh with each other when the vehicle is running and is changed from a position other than the P position to the P position. When the vehicle is parked on a slope with the load, the parking gear 5 and the parking pole 8 meshing, a large load generated according to the road gradient and a change from a position other than the P position to the P position Thus, an impact load generated when the parking pole 8 is repelled by the parking gear 5 can be mentioned.

  Next, the manufacturing process of the unit A1 will be described. The manufacturing process of unit A1 includes a molding process of case 1 and an assembly process of unit A1. First, the molding process of the case 1 will be described with reference to FIG. A mold B1 for molding the case 1 is provided, and the mold B1 includes a first mold 40 and a second mold 41. The first mold 40 is formed with a recess 42, and the second mold 41 is formed with a protrusion 43.

  Then, when the first mold 40 and the second mold 41 are clamped, a molding cavity 44 is formed between the concave portion 42 and the convex portion 43. A metal material such as aluminum is pressurized and injected into the molding cavity 44, and the case 1 as a molded product is molded by solidifying the metal material. Thus, the case 1 is manufactured by a so-called die casting method. After the case 1 is molded, the first mold 40 and the second mold 41 are opened, and when the second mold 40 is released from the case 1, the opening 1 </ b> A is formed in the case 1.

  Next, the assembly process of the unit A1 will be described. In this assembly process, the parking mechanism 4 is attached in the case 1 before the case 1 and the housing 2 are coupled. Specifically, the parking mechanism 4 is attached to the inside of the case 1 via the opening 1A. Therefore, even if the case 1 has no opening for attaching a lid member or the like, the parking mechanism 4 can be easily attached in the case 1 using the opening 1A before communicating with the inside of the housing 2. Furthermore, since there is no need to attach a lid member, the lid member, bolts for attaching the lid member, chamfering of the part to which the lid member is attached, the process of attaching the lid member, the die-casting type for the lid member, etc. can be reduced, resulting in low cost and compactness. A drive unit with a parking mechanism can be manufactured.

  After the parking mechanism 4 is attached to the case 1 as described above, the case 1 and the housing 2 are coupled and fixed. In this step, before joining the case 1 and the housing 2, the knock pin 32 is attached to the hole 1 </ b> C of the case 1, and the pole shaft 9 is attached to the hole 33 of the case 1. A parking pole 8 is attached to the pole shaft 9.

  Here, the protruding amount L1 of the knock pin 32 from the end surface 1B of the case 1 is set longer than the protruding amount L2 of the pole shaft 9 from the end surface 1B of the case 1. When the case 1 and the housing 2 are brought close to each other, the knock pin 32 first enters the hole 2C of the housing 2, and the case 1 and the housing 2 are positioned in a direction parallel to the end faces 1B and 2B. Thereafter, the pole shaft 9 enters the hole 34 of the housing 2, and the parking pole 8 is rotatably held by the case 1 and the housing 2. Then, the end surface 1B of the case 1 and the end surface 2B of the housing 2 come into contact with each other, and a screw member (not shown) is tightened to complete the coupling process between the case 1 and the housing 2.

  Thus, in the process of joining the case 1 and the housing 2, the case 1 and the housing 2 are positioned by the knock pin 32 before the pole shaft 9 contacts the holding surface 51 of the housing 2. Therefore, it is possible to prevent the tip of the pole shaft 9 from coming into contact with the holding surface 51 of the housing 2 and causing a problem such as scratching the holding surface 51. Therefore, sliding failure and operation failure of the parking pole 8 can be prevented beforehand.

  Furthermore, the tip of the knock pin 32 is provided with a taper that increases in diameter as it moves away from the tip. For this reason, the knock pin 32 can be smoothly inserted into the hole 2C. Therefore, the connection workability between the case 1 and the housing 2 is improved, and the case 1 and the housing 2 can be easily positioned without using an assembling jig or the like.

  Further, the holding portion 15 is formed with a notch portion 16 </ b> B at a location other than the portion that receives the biasing force of the torsion coil spring 11 via the cam member 27. For this reason, when the second mold 41 is released from the case 1 in the molding process of the case 1, the case 1 can be molded without any metal material remaining in the drawing direction of the second mold 41. . Therefore, it becomes easy to secure operation spaces for the shaft 21, the lever 22, the parking rod 25, and the like.

  Here, to explain the correspondence between the configuration of the embodiment and the configuration of the present invention, the case 1 corresponds to the first case of the present invention, the housing 2 corresponds to the second case of the present invention, The first mold 41 corresponds to a mold for molding the first case of the present invention, the knock pin 32 and the holes 1C and 2C correspond to the positioning member of the present invention, and the pole shaft 9 corresponds to the holding member of the present invention. The rotating shaft 3 corresponds to the rotating member of the present invention.

  In the embodiment shown in FIG. 1, most of the parking mechanism is arranged in the first case when the case 1 and the housing 2 are fixed. The present invention can also be applied to a configuration arranged over the first case and the second case. Moreover, at least one case may be comprised from the several member among the 1st case or the 2nd case. Furthermore, the rotating member may be provided in either the first case or the second case. Moreover, the positioning member should just be provided in at least one of the 1st case or the 2nd case.

  The characteristic configurations disclosed in this embodiment are listed as follows. In the drive device with a parking mechanism in which the first case and the second case are coupled and a parking mechanism for restricting the rotation of the rotating member is disposed at least inside the first case. The opening is formed by releasing the mold for molding the first case from the molded first case, and the first case and the first case. The opening is arranged at the boundary between the first case and the second case by being coupled to the second case, and the parking mechanism is coupled to the first case and the second case before coupling. The drive device with a parking mechanism is arranged inside the first case via the opening.

  Further, the second characteristic configuration is a method of manufacturing a drive device with a parking mechanism in which a parking mechanism is arranged at least inside the first case by coupling the first case and the second case. Forming the first case with a plurality of molds and releasing the mold from the molded first case, thereby forming an opening in the first case, and the first case and the second case, Before coupling, the parking mechanism is disposed inside the first case via the opening, and the manufacturing method of the drive device with the parking mechanism is provided.

  Furthermore, a third characteristic configuration is the second characteristic configuration, wherein at least one of the first case and the second case is in contact with the other case and the first case and the second case. A positioning member for positioning the second case, the parking mechanism has a parking pole, and one of the first case and the second case includes the first case and the second case. A holding member that rotatably holds the parking pole by contacting the other case, and when the first case and the second case are coupled, The positioning member contacts the other member to position the first case and the second case, and then the holding member contacts the other case so that the parking pole can rotate. Is a manufacturing method of the parking mechanism with a drive device, characterized in that the lifting Configurations.

It is front sectional drawing of the drive device with a parking mechanism of this invention. It is the side view which looked at the inside of the case of FIG. 1 from the opening part side. It is a conceptual diagram which shows the formation process of the case shown in FIG. 1 and FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Case, 1B ... Opening part, 1C, 2C ... Hole, 2 ... Housing, 3 ... Rotating shaft, 4 ... Parking mechanism, 8 ... Parking pole, 9 ... Pole shaft, 32 ... Knock pin, 40 ... 1st type | mold, 41 ... 2nd type | mold, A1 ... Drive apparatus (unit) with a parking mechanism, B1 ... Metal mold | die.

Claims (2)

In the drive device with a parking mechanism in which the first case and the second case are coupled, and the parking mechanism for restricting the rotation of the rotating member is disposed inside the first case.
The first case is provided with an opening formed by releasing a mold for molding the first case from the molded first case, and the parking mechanism includes the opening. A drive unit with a parking mechanism, which is disposed inside the first case via a part. A positioning member for positioning the first case and the second case in contact with the other case is provided between the first case and the second case. Have a pole,
Between the first case and the second case, there is provided a holding member that rotatably holds the parking pole by contacting the other case,
When the first case and the second case are coupled, the positioning member contacts the other member to position the first case and the second case, and then the holding member is the other. The drive device with a parking mechanism according to claim 1, wherein the parking pole is rotatably held in contact with the case.

Images