JP2005155849A - Motor driving-type transmission operating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To increase a speed of selecting motion and to shorten a gear shifting time. <P>SOLUTION: A striker 6 is axially movably and relatively unrotatably fitted to an outer periphery of a shift shaft 4 rotatably supported in a housing 2. A ball screw 32 mounted in parallel with the shift shaft 4 is axially movably supported, and axially moved by a ball nut 22 rotated by the driving of a select motor 16. A projection 6b of the striker 6 is engaged with a groove 34b of an engagement member 34 connected with the ball screw 32, and the engagement member 34 and the striker 6 are moved in the axial direction of the shift shaft 4 by the axial movement of the ball screw 32 to perform the select motion. A tip 32c of the ball screw 32 is inserted into a damper chamber 35 connected in a chamber of a transmission 21 through an orifice 35a to inhibit the axial movement. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a transmission operation device, and more particularly to a motor-driven transmission operation device that performs a selection operation and a shift operation of a transmission by moving or rotating a striker by driving a motor.

  A motor-driven transmission operating device includes a shift shaft that is rotatably supported in a housing, a striker that is fitted to the outer periphery of the shift shaft, and a selection motor that moves the striker in the axial direction of the shift shaft. And a shift motor that rotates the striker around the axis of the shift shaft. By controlling the operation of the select motor and the shift motor, the transmission select operation and shift operation are performed. Yes.

  An example of such a motor-driven transmission operating device (see, for example, Patent Document 1) will be briefly described. The motor-driven transmission operating device described in Patent Document 1 (referred to as an electric XY shift mechanism in Patent Document 1) is housed in a housing (shift mechanism housing 30 in Patent Document 1, the same applies hereinafter). The shift shaft (first shaft member 42) and the motor shaft (second shaft member 46) of the selection motor (motor 36) are arranged in parallel, and the striker (supporting member 44) is axially movable on the outer periphery of the shift shaft. And a shift finger 20), and a nut (cross member 48) is screwed into a threaded portion formed on the outer periphery of the motor shaft. And while forming the engaging protrusion (shoulder 50) on the striker, the nut is formed with a groove (arch-shaped groove 51) in which the protrusion can be engaged, and the protrusion and the groove are engaged, By driving the select motor to move the nut in the axial direction along the motor shaft, the striker is moved in the axial direction along the shift shaft to perform the select operation of the transmission.

In the motor-driven transmission operating device described in Patent Document 1, the position of the nut (transverse member 48) is detected by a select sensor (rotational potentiometer 77 having a lever arm 78) to drive the select motor. By controlling, the select position of the striker is controlled.
Japanese Patent No. 2992697 (page 4-6, FIG. 8)

  The problem to be solved is that if the selection operation is to be performed quickly, the striker may overshoot without stopping at the target position, and the convergence time becomes longer.

  The invention according to claim 1 is a shift shaft rotatably supported in a housing, a striker fitted to the shift shaft so as to be axially movable, and a rod disposed in parallel with the shift shaft; An engagement member that is supported by the rod and that integrally engages the striker and moves in the axial direction, and moves the engagement member in the axial direction of the rod by driving a selection motor; In a motor-driven transmission operating device that performs a selection operation of a transmission by moving the striker in the axial direction, the rod is supported in the housing so as to be movable in the axial direction, and the engaging member is integrated with the rod. The rod is moved in the axial direction by driving the select motor, thereby selecting the transmission. Utotomoni and is characterized in that a suppressing damper mechanism the axial movement of the rod.

  According to a second aspect of the present invention, the damper mechanism includes a rod insertion hole that is formed in the housing and into which an end of the rod is inserted, and an orifice that communicates the inside of the insertion hole to the outside. It is characterized by.

  The invention according to claim 3 is characterized in that the orifice of the damper chamber is communicated with the chamber of the transmission.

  According to a fourth aspect of the present invention, the rod is a screw shaft, and the nut screwed to the screw shaft is held in the housing so that the nut is rotatable and the movement in the axial direction is restricted. The screw shaft is moved in the axial direction by rotating a nut.

  The invention according to claim 5 is characterized in that the screw shaft and the nut constitute a ball screw.

  The motor-driven transmission operating device of the present invention can speed up the operation in the select direction, and can shorten the shift time.

  The engaging member that engages with the striker fitted to the shift shaft, transmits the drive of the select motor, and moves the striker in the axial direction is configured integrally with the rod, and this rod is driven by the drive of the select motor. By moving the striker in the axial direction, the striker is moved, and a damper mechanism that suppresses the axial movement of the rod is provided, so that the striker can be operated at high speed and the shift time is shortened. The purpose can be achieved.

  Hereinafter, the present invention will be described with reference to embodiments shown in the drawings. FIG. 1 is a cross-sectional view of a motor-driven transmission operating device according to an embodiment of the present invention, taken along a plane parallel to a mounting surface to the transmission, and FIG. 2 is a cross-sectional view taken along line II-II in FIG. 3 is a right side view in which a part of FIG. 1 is a cross-sectional view, and FIG. 4 is a cross-sectional view taken along line IV-IV in FIG.

  In this motor-driven transmission operating device (indicated by reference numeral 1 as a whole), a shift shaft 4 is rotatably supported in a housing 2, and a striker 6 can move in the axial direction on the outer periphery of the shift shaft 4. It is mated. As will be described later, the selection operation of the transmission is performed by moving the striker 6 in the axial direction of the shift shaft 4, and the shift operation of the transmission is performed by rotating the striker 6.

  A shift shaft holding hole 8 is formed in the housing 2, and the shift shaft 4 is rotatably held in the holding hole 8. The shift shaft 4 has a U-shaped groove 4a formed on the outer peripheral surface thereof, and the pin 10 fixed to the inner surface of the holding hole 8 is fitted into the U-shaped groove 4a to move in the axial direction. Is restricted and can rotate around its axis. The means for restricting the movement of the shift shaft 4 in the axial direction is not limited to the pin 10, and other means may be used.

  A space 12 surrounding the shift shaft 4 is formed near one end portion 8a (the left end in FIGS. 1 and 2) of the shift shaft holding hole 8 provided in the housing 2. The striker 6 is fitted on the outer periphery of the position. An axial spline groove 4 b is formed on the outer peripheral surface of the portion of the shift shaft 4 located in the space 12, while an axial spline groove 6 a is also formed on the inner peripheral surface of the striker 6 and meshes with each other. The striker 6 is movable in the axial direction of the shift shaft 4 and rotates integrally with the shift shaft 4 in the rotation direction. Both ends 4c and 4d of the shift shaft 4 are rotatably held by bearings 14 and 15 disposed in both ends 8a and 8b of the shift shaft holding hole 8.

  A selection motor 16 is attached to the housing 2, and a ball nut 22 is connected to the motor shaft 18 via a joint 20. The ball nut 22 is rotatably supported via a ball bearing 24 mounted on the inner surface of the housing 2 and is restricted from moving in the axial direction (left and right direction in FIGS. 1 and 2).

  The joint 20 has a stepped cylindrical shape as a whole, and a small-diameter connecting hole 20a is formed at an end portion on the selection motor 16 side. The inner surface of the connecting hole 20a has a non-circular cross section (for example, a D-shaped cross section), and the tip of the motor shaft 18 having the same shape is fitted into the connecting hole 20a to transmit rotation.

  The other end side (the right side in FIG. 1) of the joint 20 has a large diameter, and one end of a ball nut 22 is fitted to the inner surface thereof. On the inner surface of the large-diameter portion of the joint 20, a plurality of convex portions 20b are formed (in this embodiment, two locations as shown in FIG. 5), while the same number of concave portions 22a are formed on the outer surface of the end of the ball nut 22. The protrusions 20b and the recesses 20a are fitted to each other to transmit rotation.

  A step portion is formed on the inner surface of the through hole 2 a that accommodates the joint 20 and the ball nut 22 of the housing 2, and between the step portion and the ring 26 fitted to the inner surface of the housing 2, the step is formed. A ball bearing 24 is mounted. The ball nut 22 is rotatably supported on the inner peripheral side of the ball bearing 24. The ball nut 22 is in a state in which the ball bearing 24 is sandwiched between a step formed on the outer surface and a ring 28 fitted on the outer surface, and movement in the axial direction is restricted.

  A ball screw 32 is screwed onto the inner periphery of the ball nut 22 via a large number of balls 30. An annular engaging member 34 is fitted to the outer peripheral surface of the ball screw 32 and is locked to the ball screw 32 by a washer ring 33 so as to move integrally in the axial direction. Further, as shown in FIG. 6, the portion of the outer surface of the ball screw 32 where the engaging member 34 is fitted and the inner surface of the engaging member 34 have D-shaped sections 32a and 34a. The D-shaped portions 32a and 34a are engaged, and the relative rotation of the both 32 and 34 is restricted.

  Further, an arc-shaped groove 34 b is formed on the outer surface of the engagement member 34 on the shift shaft 4 side. On the other hand, a flange-like engagement projection 6 b is formed on the outer peripheral surface of the striker 6, and this engagement projection 6 b is fitted in the arc-shaped groove 34 b of the engagement member 34. The arc-shaped groove 34b of the engaging member 34 has an inner diameter that substantially matches the outer diameter of the engaging projection 6b of the striker 6, and allows the striker 6 to rotate and restricts the rotation of the engaging member 34. It is supposed to be. As described above, the rotation of the ball screw 32 with respect to the engaging member 34 is restricted by the D-shaped portions 32a and 34a, and the rotation of the engaging member 34 is restricted by the striker 6. When the ball nut 22 is rotated through the joint 20 by the driving of the 16, the ball screw 32 screwed into the ball nut 22 moves integrally with the engagement member 34 in the axial direction.

  A tip 32 c of the ball screw 32 is slidably fitted in a rod insertion hole 35 formed in the housing 2. An orifice 35 a is formed near the bottom (right end in FIG. 1) of the insertion hole 35, and the chamber (damper chamber) inside the insertion hole 35 communicates with the chamber of the transmission 21.

  The striker 6 fitted to the shift shaft 4 and the engagement member 34 coupled to the ball screw 20 are accommodated in the space 12 opposite to the ball screw 20 with the shift shaft 4 interposed therebetween. A guide rod 36 is disposed in parallel with the shift shaft 4 and the ball screw 20. As shown in FIG. 4, two guide rods 36 are arranged vertically, and a slide block 38 is slidably fitted to the two guide rods 36. The slide block 38 is restricted in rotation by two upper and lower guide rods 36 and is movable in the same direction as the axis of the shift shaft 4.

  On the shift shaft 4 side of the slide block 38, an engaging groove 38a is formed, and a flange-like engaging projection 6b formed on the outer surface of the striker 6 is engaged in the groove 38a. . Due to the engagement between the groove 38a of the slide block 38 and the engagement protrusion 6b of the striker 6, the slide block 38 and the striker 6 move integrally in the axial direction and the rotation of the striker 6 is allowed. Yes.

  A rotation angle detection type select sensor 40 is attached to the side of the space 12 where the shift shaft 4, the ball screw 20 and the guide rod 36 of the housing 2 are arranged in parallel, and detects the select position of the striker 6. It is supposed to be. In the select sensor 40, a U-shaped groove is formed at the tip of the detection lever 42, and a pin 44 (see FIG. 4) provided at the lower end of the slide block 38 is engaged in the U-shaped groove. The select position of the striker 6 is detected by the position of the slide block 38 that moves as the striker 6 moves on the shift shaft 4 in the axial direction.

  Next, a configuration for performing the shift operation of the motor-driven transmission operating device 1 will be described. A shift motor 46 is attached in a direction orthogonal to the shift shaft 4 of the housing 2 with a height different from that of the shift shaft 4. In this embodiment, the shift motor 46 is disposed below the attachment surface A to the transmission 21 (see FIG. 3). A ball screw 52 is connected to the motor shaft 48 of the shift motor 46 via a rotation transmission member 50, and a ball nut (connection member) 54 is screwed to the ball screw 52. A transmission lever 56 is fixed to an end portion of the shift shaft 4 opposite to the selection motor 16, and a distal end (lower end) side of the transmission lever 56 is a pair of engagement pins provided on both sides of the ball nut 54. 54a is engaged. Therefore, when the shift motor 46 is driven, the ball screw 52 rotates via the motor shaft 48, the ball nut 54 moves in the axial direction on the ball screw 52, and the transmission lever 56 rotates accordingly. . When the transmission lever 56 is rotated, the shift shaft 4 is rotated, and the striker 6 splined on the shift shaft 4 is integrally rotated. Thereby, the shift operation of the transmission 21 is performed.

  A rotation angle detection type shift sensor 58 (see FIG. 2, not shown in FIG. 1) for detecting the shift position of the striker 6 is provided on the side surface side of the transmission lever 56 of the housing 2. The shift sensor 58 has a U-shaped groove formed at the tip of the detection lever 60 and is engaged with an engagement pin 62 fixed to an intermediate portion of the transmission lever 56. The shift position of the striker 6 is detected by detecting the swing position of the transmission lever 56 fixed to the end of the shift shaft 4 by the shift sensor 58.

  The operation of the motor-driven transmission operating device 1 according to the above configuration will be described. When the motor shaft 18 is rotated by driving the selection motor 16, a ball nut 22 connected to the motor shaft 18 via a joint 20 is rotated at a position held by the ball bearing 24. When the ball nut 22 rotates, the ball screw 32 screwed into the ball nut 22 via the ball 30 has a D-shaped cross section 32a with respect to the engaging member 34 whose rotation is restricted by the striker 6. , 34a are prevented from rotating, so that they move together with the engaging member 34 in the axial direction without rotating.

  When the ball screw 32 and the engaging member 34 move in the axial direction, the striker 6 in which the flange-like engaging projection 6 b is engaged with the arc-shaped groove 34 b of the engaging member 34 is connected to the engaging member 34. The movement is integrally performed in the axial direction of the shift shaft 4, and the selection operation is performed. Since the tip 32c of the ball screw 32 is inserted into an insertion hole (damper chamber 35) formed in the housing 2, there is no overshoot due to the damper effect when the ball screw 32 moves. It can be stopped quickly and accurately. Even when the operation is speeded up, it is possible to reliably stop at the selected select position, so that the shift time can be shortened. In addition, the control method is simplified and the number of tuning steps can be reduced. Furthermore, in this embodiment, the distance between the fulcrums of the ball screw 32 is long. Therefore, even when a moment is applied to the engaging member 34 from the striker 6 side, the relative inclination between the ball screw 32 and the engaging member 34 is different from the configuration in which the nut directly receives the moment as described in Patent Document 1. Is less. As a result, efficiency is improved and durability is improved.

  As described above, when the striker 6 moves in the axial direction of the shift shaft 4 as the ball screw 32 and the engaging member 34 move in the axial direction, the striker 6 is further formed on the outer surface of the engaging projection 6b. The slide block 38 engaged with the engaging groove 38a is guided by the two guide rods 36 and moves in the axial direction. A select sensor 40 is provided on the side surface of the housing 2 on the slide block 38 side, and an engagement pin 44 fixed to the slide block 38 is connected to a detection lever 42 of the select sensor 40 so that the striker 6 moves in the axial direction. That is, the select position of the transmission 21 is detected by the select sensor 40 through the movement of the slide block 38.

  Subsequently, the shift motor 46 is driven to rotate the motor shaft 48, and the ball screw 52 is rotated via the rotation transmission member 50. By the rotation of the ball screw 52, the ball nut 54 moves in the axial direction of the ball screw 52, the transmission lever 56 is rotated, the shift shaft 4 and the striker 6 are rotated, and the transmission 21 is shifted. The shift position of the transmission 21 due to the rotation of the striker 6 is detected by a shift sensor 58.

  Note that the configuration of the connecting portion between the joint 20 and the ball nut 22 that transmits the drive of the selection motor 16 is not limited to the combination of the convex portion 20b and the concave portion 22a as shown in FIG. But it ’s okay. For example, any non-circular cross section such as a combination of a quadrangular or pentagonal outer surface and inner surface may be used as long as both 20 and 22 can be connected to transmit rotation. Further, the configuration of the connecting portion between the ball screw 32 and the engaging member 34 is not limited to the above configuration, and other configurations can be adopted. Further, the engaging member 34 and the ball screw 32 may be configured by connecting separate members as described above, or may be formed integrally.

  In the above-described embodiment, the outer surface of the ball screw 32 and the inner surface of the engaging member 34 are D-shaped cross sections 32a and 34a, and the rotation of the ball screw 32 is regulated by regulating the relative rotation of the both 32 and 34. Although it is configured to move in the axial direction, the ball screw 32 may be directly locked to the housing 2 or the like to restrict rotation. FIG. 7 shows an example of a configuration in which the ball screw 32 is axially movable and supported by the housing 2 so as to restrict rotation, and the tip end 32d side of the ball screw 32 has a D-shaped cross section. Then, an anti-rotation member 37 having a through hole 37a (see FIG. 7C) having a D cross-sectional shape that matches the shape of the tip 32d is fitted to the entrance of the insertion hole 35 into which the tip 32d is inserted. ing. In the case of this configuration, there is no need for a structure for restricting rotation between the ball screw 32 and the engaging member 34, so that the fitting portions of both 32 and 34 are both as shown in FIG. The groove 34c with which the flange-like engagement protrusion 6b of the striker 6 engages may be an annular groove over the entire circumference.

  FIG. 8 shows another embodiment. The other end 39b of the L-shaped rotation restricting pin 39, which is connected to the ball screw 32 at one end 39a, is extended in parallel with the tip end portion 32e of the ball screw 32. On the other hand, a pin insertion hole 41 parallel to the rod insertion hole 35 is formed in the housing 2, and a portion 39 b of the rotation regulating pin 39 parallel to the ball screw 32 is inserted into the pin insertion hole 41. . Even in the third embodiment, since it is not necessary to restrict the rotation of the ball screw 32 by the engaging member 34, the fitting portions of both the members 32 and 34 are made circular, and the flange-like engaging protrusion 6b of the striker 6 is used. The groove 34c that engages is also an annular groove 34c over the entire circumference. In the second and third embodiments, the same effects as those of the first embodiment can be obtained. Further, in addition to the above effects, in each of these embodiments, unlike the first embodiment, the engaging member 34 can be supported in a state in which it can rotate relative to the ball screw 32. As a result, the frequency with which the same part always comes into contact is reduced, and wear due to one piece can be reduced.

It is sectional drawing which follows the axis line of the shift shaft of a motor drive type transmission operating device. (Example 1) It is sectional drawing which follows the II-II line of FIG. FIG. 2 is a right side view with a part of FIG. 1 taken as a cross section. It is sectional drawing which follows the IV-IV line of FIG. It is sectional drawing which follows the VV line of FIG. It is sectional drawing which follows the VI-VI line of FIG. Figure (a) is a cross-sectional view of the main part of the motor-driven transmission operating device, Figure (b) is a cross-sectional view taken along the line bb of Figure (a), and Figure (c) is a cross-sectional view taken along line c-- of Figure (a). It is sectional drawing which follows c line. (Example 2) Figure (a) is a cross-sectional view of the main part of the motor-driven transmission operating device, Figure (b) is a cross-sectional view taken along the line bb of Figure (a), and Figure (c) is a cross-sectional view taken along line c-- of Figure (a). It is sectional drawing which follows c line. Example 3

Explanation of symbols

A Attaching surface to transmission 2 Housing 4 Shift shaft 6 Striker 16 Selector motor 21 Transmission 32 Rod (ball screw)
34 Engagement member (ball nut)
35 Damper chamber (insertion hole)
35a Orifice

Claims (5)

A shift shaft rotatably supported in the housing, a striker fitted to the shift shaft so as to be axially movable, a rod disposed in parallel with the shift shaft, supported by the rod, and An engaging member that engages with the striker and moves integrally in the axial direction, and moves the engaging member in the axial direction of the rod by driving the selection motor, thereby moving the striker in the axial direction to change speed. In the motor-driven transmission operating device that performs the select operation of the machine,
The rod is supported in the housing so as to be movable in the axial direction, and the engaging member is provided so as to move in the axial direction integrally with the rod, and the rod is moved in the axial direction by driving the selection motor. A motor-driven transmission operating device comprising a damper mechanism that performs a selection operation of the transmission and suppresses the axial movement of the rod.   The motor according to claim 1, wherein the damper mechanism includes a rod insertion hole formed in the housing and into which an end of the rod is inserted, and an orifice communicating with the inside of the insertion hole. Drive type transmission operation device.   3. The motor-driven transmission operating device according to claim 2, wherein an orifice of the damper chamber communicates with a transmission chamber.   The rod is a screw shaft, and the nut screwed to the screw shaft is rotatably held in the housing while restricting the axial movement, and the nut is rotated by a selection motor to rotate the screw shaft. The motor-driven transmission operating device according to any one of claims 1 to 3, wherein the motor-driven transmission operating device is moved in a direction.   The motor-driven transmission operating device according to claim 4, wherein the screw shaft and the nut constitute a ball screw.

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