JP2012197826A - Transmission driving device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transmission driving device, with which time required for select operation can be significantly reduced, and thus speed change operation of a transmission can be performed in a short time.SOLUTION: Internal levers 16A, 16B, 16C have pull-type electromagnetic solenoids 22A, 22B, 22C, respectively. The electromagnetic solenoids 22A, 22B, 22C have frames 18A, 18B, 18C fixed to a shift shaft 15, actuators 19A, 19B, 19C extended/retracted with respect to the frames 18A, 18B, 18C, respectively, and an electromagnetic coil 20 disposed to surround the circumference of the actuator 19A. By switching energization/disenergization to the electromagnetic solenoid 20, the respective actuators 19A, 19B, 19C are displaced between an engagement position D1 where the actuators are engaged with a fork head 12A and an engagement release position D2 where the actuators are not engaged with the fork head 12A.

Description

  The present invention relates to a transmission drive device for driving a transmission.

  2. Description of the Related Art Conventionally, there is known an automatic manual transmission (Automated Manual Transmission) transmission in which manual transmission is automated. This type of transmission includes, for example, a transmission including a parallel gear type transmission mechanism, and a transmission drive device for driving the transmission mechanism. The speed change drive device includes a shift shaft for causing the speed change mechanism to perform a shift operation. An internal lever is attached to the middle portion of the shift shaft so as to be integrally rotatable and movable in the axial direction (see, for example, Patent Document 1).

  The transmission is provided with a plurality of fork shafts each having a shift fork fixed in parallel to each other. A fork head for engaging with an internal lever is fixed to the middle part of each fork shaft. When the select drive mechanism is driven and the internal lever is moved in the axial direction with respect to the fork shaft, the tip of the internal lever engages with a required fork head, and the select operation is achieved. Further, when the shift drive mechanism is driven and the shift shaft is rotated around its central axis, the internal lever swings around the central axis of the shift shaft, thereby engaging with the internal lever. The fork head moves in the axial direction of the fork shaft to achieve the shift operation.

  There has also been proposed a transmission that employs a shift shaft in which an internal lever is fixedly attached (this type of shift shaft is hereinafter referred to as a “shift select shaft”) instead of the shift shaft (for example, a patent). Reference 2). In this type of transmission, a shift select shaft is provided in the transmission housing so as to be movable in the axial direction. When the select drive mechanism is driven and the internal lever is moved in the axial direction together with the shift select shaft, the internal lever is engaged with a required fork head, and the select operation is achieved. In addition, when the shift drive mechanism is driven and the shift select shaft is rotated around its central axis, the internal lever swings around the central axis of the shift shaft, thereby engaging the internal lever. The fork head is moved in the axial direction of the fork shaft to achieve the shift operation.

JP-A-5-256359 JP-A-63-30737

  However, in the configuration of Patent Document 1 or 2 described above, the internal lever or the shift select shaft is moved a predetermined distance from the shift shaft or the shift select shaft for a select operation (switching the fork head selection destination. Select operation). It is necessary to move in the axial direction. For this reason, a certain amount of time is required for the execution of the select operation, and accordingly, a time is required for the shift operation accompanied by the select operation.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a transmission drive apparatus that can significantly reduce the time required for a select operation, and thereby can perform a speed change operation of the transmission in a short time.

  In order to achieve the above object, the invention according to claim 1 is fixedly attached to a plurality of fork shafts (10A, 10B, 10C) and in the middle of the axial direction (M1, M2, M3) of each fork shaft. A transmission drive device (3) for driving a transmission (2) having a fork head (12A, 12B, 12C) having a center axis (17; 17A; 17B). 15A; 15B) and an internal lever (16A, 16B, 16C) provided on the shift shaft corresponding to each fork head, and each internal lever is fixed to a middle portion of the shift shaft A main body (18A, 18B, 18C) and an actuator (19A, 19) supported by the main body so as to be movable with respect to the main body along the rotational radius direction (M5) of the shift shaft. , 19C), an engagement position (D1) for engaging each actuator with the corresponding fork head, and an inner position in the rotational radius direction with respect to the engagement position. Transmission including actuator moving means (22A, 22B, 22C) for moving between disengagement positions (D2) that do not match, and rotation drive means (23) for rotating the shift shaft about the central axis It is a drive device.

In addition, although the alphanumeric characters in parentheses represent corresponding components in the embodiments described later, the scope of the claims is not intended to be limited to the embodiments.
According to this configuration, in each interlever, the actuator is provided so as to be movable between the engagement release position and the engagement position. Therefore, the actuator can be switched between a state where the actuator is engaged with the corresponding fork head and a state where the actuator is not engaged with the corresponding fork head by the movement of the actuator. Therefore, the actuator corresponding to the required fork head is positioned at the engagement position, and the actuator corresponding to the other fork head is positioned at the disengagement position, thereby engaging the internal lever with the required fork head. Thus, the fork head selection operation (select operation) is achieved. Then, while the internal lever actuator engaged with the fork head is kept in the engaged position, the internal lever is swung around the central axis by rotating the shift shaft around the central axis. The fork head engaged with the null lever moves in the axial direction of the fork shaft. Thereby, a shift operation is achieved.

In this configuration, since the select operation can be performed by the retracting operation of the actuator, the time required for the select operation can be shortened compared to the case where the shift shaft and the internal lever are moved in the axial direction. Thereby, the speed change operation of the transmission can be performed in a short time.
As described in claim 2, the actuator moving means may include electromagnetic solenoids (22A, 22B, 22C). In this case, the actuator may include an electromagnetic solenoid plunger (19A, 19B, 19C).

  As described in claim 3, the shift shaft (15A) is a hollow shaft, and is housed inside the shift shaft so as to be rotatable integrally with the shift shaft, and extends in the axial direction (M4) of the shift shaft. Wiring (32A, 32B, 32C, 32D) and a connection structure (33A, 33B, 33C, 33D) for electrically connecting the metal wiring and each electromagnetic solenoid; A power supply mechanism (30) for supplying power from a power source to the plurality of electromagnetic solenoids may be further included.

  According to this configuration, power is supplied to the electromagnetic solenoid via the power supply mechanism disposed inside the shift shaft. Since the power feeding mechanism is provided so as to be integrally rotatable with the shift shaft, the length of the wiring necessary for connecting the connection structure and the electromagnetic solenoid is constant regardless of the rotation posture of the shift shaft and the electromagnetic solenoid. Therefore, it is not necessary to consider the change in the wiring length accompanying the rotation of the shift shaft, so that the layout layout design of the electromagnetic solenoid can be performed relatively easily.

According to a fourth aspect of the present invention, the shift shaft (15B) is arranged on the outer periphery of the shift shaft so as to be integrally rotatable with the shift shaft, extends in the axial direction (M4) of the shift shaft, It may further include metal wiring (42A, 42B, 42C, 42D) for supplying power to the plurality of electromagnetic solenoids.
According to this configuration, power is supplied to the electromagnetic solenoid via the metal wiring disposed on the outer periphery of the shift shaft. Since the metal wiring is provided on the shift shaft so as to be integrally rotatable, the length of the wiring necessary for connecting the metal wiring and the electromagnetic solenoid is constant regardless of the rotation posture of the shift shaft and the electromagnetic solenoid. Therefore, it is not necessary to consider the change in the wiring length accompanying the rotation of the shift shaft, so that the layout layout design of the electromagnetic solenoid can be performed relatively easily.

  The invention according to claim 5 further includes control means (24) for controlling the actuator moving means and the rotation driving means, and the control means is configured to control the internal lever engaged with the fork head. Controlling the actuator moving means to retract the actuator of the internal lever not engaged with the fork head to the engagement position at the same time as retracting the actuator to the disengagement position; It is a transmission drive device as described in any one of Claims 1-4.

  According to this configuration, the retracting operation of the actuator and the advancing operation of the actuator are performed at the same time, so that the selection operation can be executed in a shorter time. Thereby, the shifting operation of the transmission can be performed in a shorter time.

1 is an exploded perspective view of a schematic configuration of a transmission to which a transmission drive device according to an embodiment of the present invention is applied. It is sectional drawing which shows the principal part structure of an internal lever and a fork head shown in FIG. It is sectional drawing of the shift shaft in the transmission drive device which concerns on other embodiment of this invention. FIG. 4 is a side view showing a configuration of a main part on the outer periphery of the shift shaft shown in FIG. 3. It is sectional drawing seen from the cut surface line VV of FIG. It is sectional drawing of the shift shaft in the transmission drive device which concerns on further another embodiment of this invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is an exploded perspective view of a schematic configuration of a transmission 1 to which a transmission drive device 3 according to an embodiment of the present invention is applied.
The transmission 1 includes a transmission 2 and a transmission drive device 3 for driving the transmission 2 to change speed.

  The transmission 2 includes a power transmission mechanism configured by a known constant mesh parallel shaft gear transmission mechanism, and a speed change operation mechanism 6 for switching a power transmission path of the power transmission mechanism between a plurality of power transmission paths. A gear housing 7 that houses the power transmission mechanism and the speed change operation mechanism 6 is provided, and is mounted on a vehicle such as a passenger car or a truck. The power transmission ratio can be varied by switching the power transmission path in the power transmission mechanism.

  The speed change operation mechanism 6 is housed in a gear housing 7 and has a plurality of fork shafts 10A, 10B, and 10C extending in parallel to each other. The plurality of fork shafts 10A, 10B, and 10C are juxtaposed so as to be positioned on a straight line when viewed from the axial directions M1, M2, and M3. Fork heads 12A, 12B, and 12C that are driven by the transmission drive device 3 are fixed to midway portions of the fork shafts 10A, 10B, and 10C. These fork heads 12A, 12B, and 12C are aligned in the axial directions M1, M2, and M3. Each fork head 12 </ b> A, 12 </ b> B, 12 </ b> C has opposed surfaces 13 </ b> A, 13 </ b> B, 13 </ b> C that face the transmission drive device 3. These facing surfaces 13A, 13B, and 13C have the same plane. Engagement recesses 14A, 14B, and 14C are formed in the central portions of the facing surfaces 13A, 13B, and 13C. Further, a shift fork 11 for engaging with an operated member (not shown, for example, a clutch sleeve) operated to switch the power transmission path of the power transmission mechanism is fixed to each fork shaft 10A, 10B, 10C. (Only the shift fork 11 provided on the fork shaft 10A is shown in FIG. 1). By shifting the shift fork 11 in the axial direction M1, M2, M3, the shift fork 11 can be engaged with the operated member, and the operated member can be driven. In FIG. 2, which will be described later, engagement grooves are shown as the engagement recesses 14A, 14B, and 14C, but it goes without saying that engagement holes may be employed instead of the engagement grooves.

  The transmission drive device 3 includes a columnar shift shaft 15 for causing the shift operation mechanism 6 to perform a shift operation, and an electric actuator (rotation drive means) 23 used as a drive source for shifting the shift shaft 15. It has. The shift shaft 15 is supported by the gear housing 7 so as to be rotatable around the central axis 17. The shift shaft 15 is disposed in a state of a so-called 90 ° staggered shaft relationship with each of the fork shafts 10A, 10B, and 10C, and has a central axis 17.

  A plurality (three in this embodiment) of internal levers 16A, 16B, and 16C arranged in the axial direction M4 are provided in the middle portion of the shift shaft 15 (portion accommodated in the gear housing 7). Each internal lever 16A, 16B, 16C is provided in a one-to-one correspondence with the fork heads 12A, 12B, 12C. Each internal lever 16A, 16B, 16C is disposed in proximity to the corresponding fork head 12A, 12B, 12C.

  The first internal lever 16A is provided corresponding to the fork head 12A. The first internal lever 16A includes a frame (main body portion) 18A fixed to the shift shaft 15 and an actuator 19A that moves out and with respect to the frame 18A. The front end portion (lower end portion shown in FIG. 1) of the actuator 19A is disposed so as to face the facing surface 13A of the fork head 12A, and enters the engaging recess 14A formed in the facing surface 13A to enter the fork head 12A. It can be engaged.

  The second internal lever 16B is provided corresponding to the fork head 12B. The second internal lever 16B includes a frame 18B fixed to the shift shaft 15 and an actuator 19B that moves out and retracts with respect to the frame 18B. The front end portion (lower end portion shown in FIG. 1) of the actuator 19B is disposed so as to face the facing surface 13B of the fork head 12B, and enters the engagement recess 14B formed in the facing surface 13B to enter the fork head 12B. It can be engaged.

  The third internal lever 16C is provided corresponding to the fork head 12C. The third internal lever 16C includes a frame 18C that is fixed to the shift shaft 15 and an actuator 19C that is moved back and forth with respect to the frame 18C. The distal end portion (lower end portion shown in FIG. 1) of the actuator 19C is disposed to face the facing surface 13C of the fork head 12C, and enters the engagement recess 14C formed in the facing surface 13C to enter the fork head 12C. It can be engaged.

  FIG. 2 is a cross-sectional view showing the main configuration of the first to third internal levers 16A, 16B, 16C and the fork heads 12A, 12B, 12C. Each internal lever 16A, 16B, 16C is provided with pull-type electromagnetic solenoids 22A, 22B, 22C. Since the electromagnetic solenoids 22A, 22B, and 22C have the same configuration, the electromagnetic solenoids 22A, 22B, and 22C will be described below by taking the electromagnetic solenoid 22A as an example, and the configuration of the electromagnetic solenoids 22B and 22C will be described. Omitted.

As shown in FIG. 2, the electromagnetic solenoid 22A is arranged so as to surround the actuator 19A functioning as a plunger (movable iron core), the fixed iron core 25 constituting the actuator 19A and the magnetic core, and the periphery of the magnetic core. An electromagnetic coil 20, an actuator 19 </ b> A, a fixed iron core 25, and a frame 18 </ b> A that accommodates the electromagnetic coil 20 are provided.
The frame 18A has a substantially box shape and is formed using a ferromagnetic material (for example, steel). The base side of the frame 18 </ b> A is fixed to the shift shaft 15. An opening 21 is formed in the tip wall of the frame 18A (lower wall shown in FIG. 2) at a portion facing the engagement recess 14A of the fork head 12A. The fixed iron core 25 is formed using a ferromagnetic material (for example, steel) and is fixed to the frame 18A. The frame 18B and the frame 18C have the same configuration as the frame 18A as described above.

  Actuator 19A is one direction in the rotational radius direction of shift shaft 15 (more specifically, in the neutral state of the speed change operation, actuator 19 is axial direction M4 of shift shaft 15 and the axial direction of fork shafts 10A, 10B, and 10C. It is a long member extending along M5 (a direction perpendicular to both M1, M2, and M3), and is formed using a ferromagnetic material (for example, steel). Although FIG. 1 shows a substantially prismatic actuator 19A, it may be a rod or a circular cross section.

  The tip of the actuator 19A is exposed to the outside of the frame 18A through the opening 21 and faces the engagement recess 14A of the fork head 12A. The actuator 19A is provided so as to be movable along one direction M5 in the rotational radius direction. Various shapes can be adopted as the shape of the tip of the actuator 19A depending on the shape corresponding to the bottom of the corresponding engagement recess 14A. As described above, the actuator 19B and the actuator 19C have the same configuration as the actuator 19A.

The electromagnetic coil 20 is provided by winding a wire such as a copper wire around a bobbin (not shown). When the electromagnetic coil 20 (wire material thereof) is energized, a magnetic field is generated in the electromagnetic coil 20.
The electromagnetic solenoid 22A includes a biasing member (not shown) that elastically biases the actuator 19A toward the engagement position D1. In a state where the electromagnetic coil 20 is not energized, no magnetic field is generated in the electromagnetic coil 20, and therefore the actuator 19A is located at the engagement position D1. On the other hand, when the electromagnetic coil 20 is energized, a magnetic field is generated in the electromagnetic coil 20, and the actuator 19A is attracted to the fixed iron core 25 and reaches the disengagement position D2 against the urging force of the urging member. Moving. The engagement position D1 is a position where the tip of the actuator 19A enters the corresponding engagement recess 14A of the fork head 12A, and the actuator 19A engages with the fork head 12A. The engagement release position D2 The position where the tip of the actuator 19A is retracted from the corresponding engagement recess 14A and the actuator 19A is not engaged with the fork head 12A. That is, the actuator 19A is displaced between the engagement position D1 and the disengagement position D2 by switching between the power-off state and the power-on state of the electromagnetic coil 20.

  As described above, the electromagnetic solenoids 22A, 22B, and 22C have the same configuration. That is, the actuator 19B and the actuator 19C are also provided to be displaceable between the engagement position D1 and the engagement release position D2, respectively. FIG. 2 shows a state in which the actuator 19A is in the engagement release position D2, the actuator 19B is in the engagement position D1, and the actuator 19C is in the engagement release position D2.

  When the fork head 12A is a required fork head (selection fork head), the selection operation (select operation) by the speed change operation mechanism 6 is such that the actuator 19A corresponding to the fork head 12A is positioned at the engagement position D1. This is achieved by positioning the actuators 19B, 19C corresponding to the other fork heads 12B, 12C at the disengagement position D2. Then, while the actuator 19A engaged with the fork head 12A is held at the engagement position D1, the actuator 19A swings around the center axis 17 by rotating the shift shaft 15 around the center axis 17. Then, the fork head 12A engaged with the actuator 19A moves in the axial direction M1 of the fork shaft 10A. Thereby, the shift operation by the speed change operation mechanism 6 is achieved.

  As shown in FIG. 2, a solenoid drive circuit 26 is connected to the electromagnetic solenoids 22A, 22B, and 22C. The solenoid drive circuit 26 is supplied with power from a power source (not shown). The solenoid drive circuit 26 includes a first circuit (not shown) for driving the electromagnetic solenoid 22A, a second circuit (not shown) for driving the electromagnetic solenoid 22B, and an electromagnetic solenoid 22C between the power source and the ground. A third circuit (not shown) for driving the is connected in parallel.

  Further, the transmission drive device 3 drives a switching mechanism (not shown) such as a relay for switching opening and closing of each circuit (first, second and third circuits) provided in the solenoid drive circuit 26. A relay drive unit 27 is provided. By driving the relay drive unit 27, the opening and closing of each circuit (first, second, and third circuits) is switched, and power from the power source is individually supplied to the electromagnetic solenoids 22A, 22B, and 22C via the solenoid drive circuit 26. It comes to be supplied. The power supply to the electromagnetic solenoids 22A, 22B, and 22C is performed via wiring with a harness, for example.

  The transmission drive device 3 includes a control unit (control means) 24 including an ECU (Electronic Control Unit). The solenoid drive circuit 26, the relay drive unit 27, and the control unit 24 are accommodated outside the gear housing 7, more specifically, for example, in the housing of the electric actuator 23 described below. A relay driving unit 27 is connected to the control unit 24 as a control target. The control unit 24 drives the relay drive unit 27 to switch between energization / disconnection of each electromagnetic solenoid 22A, 22B, 22C. Further, as shown in FIG. 1, the control unit 24 also performs drive control of the electric actuator 23.

Next, a case where a power transmission path (not shown) is switched by a speed change operation of the speed change operation mechanism 6 including a select operation will be considered. For example, the shift fork 11 of the fork shaft 10A is engaged with the operated member before the power transmission path is switched, and the shift fork 11 of the fork shaft 10B is engaged with the operated member after the power transmission path is switched. Will be described.
At the start timing of the speed change operation, the control unit 24 controls the electric actuator 23 to rotate the shift shaft 15 around the central axis 17 so that the axial direction M1 position of the fork shaft 10A is a neutral position (position shown in FIG. 1). To return. Thereby, the engagement between the shift fork 11 of the fork shaft 10A and the operated member is released.

  Next, the control unit 24 controls the electromagnetic solenoid 22A to retract the actuator 19A engaged with the fork head 12A from the engagement position D1 to the engagement release position D2. As a result, the engagement between the internal lever 16A and the fork head 12A is released. Further, the control unit 24 controls the electromagnetic solenoid 22B to advance the actuator 19B that has been in the engagement release position D2 to the engagement position D1. Thereby, the internal lever 16B and the fork head 12B can be engaged. The actuator 19B is not displaced at the disengagement position D2. The select operation is achieved by the withdrawal operation of these actuators 19A and 19B. At this time, the retracting operation of the actuator 19A and the advancing operation of the actuator 19B are performed simultaneously.

Next, the control unit 24 drives the electric actuator 23 to rotate the shift shaft 15 around the central axis 17 to move the fork shaft 10B in the axial direction M2. Thereby, the shift fork 11 of the fork shaft 10B is engaged with the operated member, and switching of the power transmission path is achieved.
As described above, according to this embodiment, the fork heads 12A, 12B, and 12C can be selected by moving the actuators 19A, 19B, and 19C, so that the shift shaft 15 and the internal levers 16A, 16B, and 16C can be operated. Compared with the case of moving the axis direction M1, M2, M3, the time required for the selection operation can be shortened. Moreover, since the retracting operation of the actuator 19A and the advancing operation of the actuator 19B are performed simultaneously, the select operation can be executed in a shorter time. Thereby, the speed change operation of the transmission 2 can be performed in a short time.

  FIG. 3 is a cross-sectional view of a shift shaft in a transmission drive apparatus according to another embodiment of the present invention. In this embodiment, parts corresponding to those shown in the embodiment shown in FIGS. 1 and 2 are denoted by the same reference numerals as those in the embodiment shown in FIGS. 1 and 2, and description thereof is omitted. . The embodiment shown in FIG. 3 is different from the embodiment shown in FIGS. 1 and 2 in that the power supply mechanism 30 provided in association with the shift shaft is used to move the solenoid drive circuit 26 outside the gear housing 7 from This is because power is supplied to the electromagnetic solenoids 22A, 22B, and 22C in the gear housing 7.

  In this embodiment, a hollow cylindrical shift shaft 15A is employed instead of the solid shift shaft 15 shown in FIGS. The shift shaft 15A has the same configuration as the shift shaft 15 except that it is hollow, and has a central axis 17A. The power feeding mechanism 30 is housed inside the shift shaft 15A, is disposed on the substrate 31 and extends along the axial direction M4 (see FIG. 4) of the shift shaft 15A, and the axial direction M4 of the shift shaft 15A. A plurality of (four in this embodiment) metal wirings 32A, 32B, 32C, and 32D, which are examples of metal wirings extending along the line, are provided. The substrate 31 and the copper wirings 32A, 32B, 32C, 32D extend inside the shift shaft 15A across the inside and outside of the gear housing 7 (see FIG. 1).

  The substrate 31 is formed using an insulating material (synthetic resin such as polyphenylene sulfide resin (PPS) or glass epoxy resin). In FIG. 3, the substrate 31 is a flat plate, and the side edge is fixedly supported on the inner peripheral wall of the shift shaft 15A. Therefore, the substrate 31 and the copper wirings 32A, 32B, 32C, and 32D are provided on the shift shaft 15A so as to be integrally rotatable. Copper wirings 32A, 32B, 32C, and 32D are arranged on one side main surface of substrate 31 (a surface facing the central axis 17A side of shift shaft 15A). The copper wirings 32A, 32B, 32C, 32D are formed by casting, for example, and are arranged at intervals. These four copper wirings 32A, 32B, 32C, and 32D extend in parallel to each other.

  A solenoid drive circuit 26 (see FIG. 2) is connected to one end (outside of the gear housing 7) of the copper wirings 32A, 32B, 32C, 32D through a brush mechanism. Since the brush mechanism is interposed, the copper wirings 32A, 32B, 32C, 32D and the solenoid drive circuit 26 are connected to each other regardless of the rotational attitude of the copper wirings 32A, 32B, 32C, 32D around the center axis 17A of the shift shaft 15A. The electrical connection between them is always maintained. The copper wirings 32A, 32B, and 32C are provided so as to be connectable to the power supply via the solenoid drive circuit 26, and the copper wiring 32D is provided so as to be connectable to the ground of the solenoid drive circuit 26.

  FIG. 4 is a side view showing the configuration of the main part on the outer periphery of the shift shaft 15A. FIG. 5 is a cross-sectional view taken along the section line VV in FIG. A plurality (four in this embodiment) of lead members (connection structures) 33A, 33B, 33C, and 33D are provided on the outer periphery of the shift shaft 15A near the internal lever 16A (see FIGS. 1 and 2). They are juxtaposed along the axial direction M4 of the shift shaft 15A. The lead members 33A, 33B, 33C, and 33D are associated with the copper wirings 32A, 32B, 32C, and 32D on a one-to-one basis.

  As shown in FIG. 5, each lead member 33A, 33B, 33C, 33D is long in the circumferential direction and has an arcuate strip shape along the outer peripheral surface of the shift shaft 15A (only the lead member 33A is shown in FIG. 5). The lead members 33B, 33C, and 33D have the same configuration as the lead member 33A). Each lead member 33A, 33B, 33C, 33D has a predetermined circumferential length. 4 shows a configuration in which a plurality of lead members 33A, 33B, 33C, and 33D are arranged in a straight line along the central axis 17A of the shift shaft 15A, the plurality of lead members 33A, 33B, 33C, and 33D are shifted. It may be shifted in the circumferential direction of the shaft 15A. FIG. 4 shows an example in which the lead members 33D, 33C, 33B, and 33A are arranged in this order from the electric actuator 23 side at equal intervals, but the lead members 33A, 33B, 33C, and 33D The order is not limited to this mode, and the arrangement intervals of the lead members 33A, 33B, 33C, and 33D may not be equal.

  With respect to the arrangement position of each lead member 33A, 33B, 33C, 33D on the shift shaft 15A, a through-hole 35 that penetrates the inner peripheral wall and the outer peripheral wall of the hollow shift shaft 15A (in FIG. Only the through-hole 35 to be formed is shown). One end of lead wires 34A, 34B, 34C, 34D is connected to each of the copper wirings 32A, 32B, 32C, 32D. The other end portions of the lead wires 34A to 34D are inserted through the through holes 35 and drawn out to the outer periphery of the shift shaft 15A, and are connected to corresponding lead members 33A, 33B, 33C, and 33D. Thereby, the copper wirings 32A, 32B, 32C, and 32D and the corresponding lead members 33A, 33B, 33C, and 33D are electrically connected.

  For example, one side terminal of an electromagnetic solenoid 22A (see FIG. 2) is electrically connected to the lead member 33A. For example, one terminal of an electromagnetic solenoid 22B (see FIG. 2) is electrically connected to the lead member 33B. For example, one terminal of an electromagnetic solenoid 22C (see FIG. 2) is electrically connected to the lead member 33C. For example, the other terminals of the electromagnetic solenoids 22A, 22B, and 22C are electrically connected to the lead member 33D.

2 to 5, when the control unit 24 drives the relay drive unit 27 so that the electromagnetic solenoid 22A is energized, the current from the power source is changed to the copper wiring 32A, the lead wire 34A, and the lead member 33A. And flows to the electromagnetic solenoid 22A through the lead member 33D, the lead wire 34D, and the copper wiring 32D to the ground.
When the control unit 24 drives the relay drive unit 27 so that the electromagnetic solenoid 22B is energized, the current from the power source flows to the electromagnetic solenoid 22B through the copper wiring 32B, the lead wire 34B, and the lead member 33B. At the same time, it flows to the ground through the lead member 33D, the lead wire 34D, and the copper wiring 32D.

Further, when the control unit 24 drives the relay drive unit 27 so that the electromagnetic solenoid 22C is energized, the current from the power source flows to the electromagnetic solenoid 22C through the copper wiring 32C, the lead wire 34C, and the lead member 33C. At the same time, it flows to the ground through the lead member 33D, the lead wire 34D, and the copper wiring 32D.
According to this embodiment (the embodiment shown in FIGS. 3 to 5), the electromagnetic solenoids 22A, 22B, and 22C are arranged inside the shift shaft 15A from the solenoid drive circuit 26 arranged outside the gear housing 7. Power is supplied through the supplied power supply mechanism 30. Since the power feeding mechanism 30 is provided so as to be integrally rotatable with the shift shaft 15A, the lead members 33A to 33D and the electromagnetic solenoids 22A, 22B, and 22C are connected regardless of the rotation postures of the shift shaft 15A and the electromagnetic solenoids 22A, 22B, and 22C. The length of the wiring necessary for connecting the wires (in this case, the length of the lead wires 34A to 34D) is constant. Therefore, since it is not necessary to consider the change in the wiring length accompanying the shift operation of the speed change operation mechanism 6, the layout layout design of the electromagnetic solenoids 22A, 22B, 22C can be performed relatively easily.

  FIG. 6 is a cross-sectional view of a shift shaft in a transmission drive apparatus according to still another embodiment of the present invention. In this embodiment, parts corresponding to those shown in the embodiment shown in FIGS. 1 and 2 are denoted by the same reference numerals as those in the embodiment shown in FIGS. 1 and 2, and description thereof is omitted. . The embodiment shown in FIG. 6 is different from the embodiment shown in FIGS. 3 to 5 in that a solid shift shaft 15B is employed instead of the hollow shift shaft 15A. Further, in place of the power feeding mechanism 30, a power feeding mechanism 40 provided in association with the outer periphery of the shift shaft 15B is employed. The shift shaft 15B has the same configuration as the shift shaft 15 and has a central axis 17B.

  The power feeding mechanism 40 is disposed on the outer periphery of the shift shaft 15B, and extends along the axial direction of the shift shaft 15B (a direction orthogonal to the paper surface in FIG. 6). Copper wirings 42A, 42B, 42C, and 42D are provided as an example of a plurality of (four in this embodiment) metal wirings extending along the axial direction. The substrate 41 and the copper wirings 42A, 42B, 42C, 42D extend across the inside and outside of the gear housing 7 (see FIG. 1) on the outer periphery of the shift shaft 15B.

  The substrate 41 is formed using an insulating material (synthetic resin such as polyphenylene sulfide resin (PPS) or glass epoxy resin). As shown in FIG. 6, the substrate 41 is an arc-shaped plate along the outer periphery of the shift shaft 15B, and is fixedly supported on the outer peripheral wall of the shift shaft 15B. Therefore, the substrate 41 and the copper wirings 42A, 42B, 42C, and 42D are provided on the shift shaft 15B so as to be integrally rotatable. Copper wirings 42A, 42B, 42C, and 42D are disposed on one main surface of the substrate 41 (the surface facing the central axis 17B side of the shift shaft 15B). The copper wirings 42A, 42B, 42C, 42D are formed by casting, for example, and are arranged with a space therebetween. These four copper wirings 42A, 42B, 42C, and 42D extend in parallel to each other.

A solenoid drive circuit 26 (see FIG. 2) is connected to one end (outside of the gear housing 7) of the copper wirings 42A, 42B, 42C, 42D through a brush mechanism. The copper wirings 42A, 42B, and 42C are provided so as to be connectable to the power supply via the solenoid drive circuit 26, and the copper wiring 42D is provided so as to be connectable to the ground of the solenoid drive circuit 26.
An electromagnetic solenoid 22A (see FIG. 2) is connected to the other end of the copper wirings 42A, 42B, 42C, 42D (in the vicinity of the internal levers 16A-16C on the shift shaft 15B) via a lead wire (not shown). The terminals of the solenoid 22B (see FIG. 2) and the electromagnetic solenoid 22C (see FIG. 2) are connected.

  Specifically, one end terminal of the electromagnetic solenoid 22A is electrically connected to the other end portion of the copper wiring 42A. One end terminal of the electromagnetic solenoid 22B is electrically connected to the other end portion of the copper wiring 42B. One end terminal of the electromagnetic solenoid 22C is electrically connected to the other end portion of the copper wiring 42C. The other side terminals of the electromagnetic solenoids 22A, 22B, 22C are electrically connected to the other side end of the copper wiring 42D.

When the control unit 24 drives the relay driving unit 27 so that the electromagnetic solenoid 22A is energized, the current from the power source flows to the electromagnetic solenoid 22A through the copper wiring 42A and the lead wire, and the lead wire and It flows to the ground through the copper wiring 42D.
Referring to FIGS. 2 and 6, when control unit 24 drives relay drive unit 27 so that electromagnetic solenoid 22B is energized, the current from the power source passes through copper wiring 42B and the lead wire, and the electromagnetic solenoid. The current flows to 22B and flows to the ground through the lead wire and the copper wiring 42D.

Further, when the control unit 24 drives the relay drive unit 27 so that the electromagnetic solenoid 22C is energized, the current from the power source flows to the electromagnetic solenoid 22C through the copper wiring 42C and the lead wire, and the lead wire and It flows to the ground through the copper wiring 42D.
According to this embodiment (the embodiment shown in FIG. 6), the electromagnetic solenoids 22A, 22B, 22C are supplied with power from the solenoid drive circuit 26 arranged outside the gear housing 7 and arranged on the outer periphery of the shift shaft 15B. Power is supplied through the mechanism 40. Since the power feeding mechanism 40 is provided so as to be integrally rotatable with the shift shaft 15B, the copper wirings 42A to 42D and the electromagnetic solenoids 22A, 22B, 22C can be connected regardless of the rotation posture of the shift shaft 15B and the electromagnetic solenoids 22A, 22B, 22C. The length of wiring necessary for connecting the wires (in this case, the length of the lead wire) is constant. Therefore, since it is not necessary to consider the change in the wiring length accompanying the shift operation of the speed change operation mechanism 6, the layout layout design of the electromagnetic solenoids 22A, 22B, 22C can be performed relatively easily.

Although three embodiments of the present invention have been described above, the present invention can be implemented in other forms. For example, as the electromagnetic solenoids 22A, 22B, and 22C, pull-type electromagnetic solenoids have been exemplified. However, push-type electromagnetic solenoids and push-pull electromagnetic solenoids may be employed.
In the above-described embodiment, the plungers of the electromagnetic solenoids 22A, 22B, and 22C are used as the actuators 19A, 19B, and 19C. However, the actuators may be provided separately from the plungers of the electromagnetic solenoids 22A, 22B, and 22C. In this case, for example, an actuator may be arranged at the tip of the plunger of the electromagnetic solenoids 22A, 22B, 22C.

Further, the solenoid drive circuit 26, the relay drive unit 27, and the control unit 24 may be accommodated in the gear housing 7.
Further, it goes without saying that motors or other driving members can be employed as the driving members for driving the actuators 19A, 19B, 19C instead of the electromagnetic solenoids 22A, 22B, 22C.

Moreover, although copper wiring was mentioned as an example in the power feeding mechanisms 30 and 40 as metal wiring, wiring can also be formed using other conductive materials.
Further, as described above, it goes without saying that wiring by a harness or the like may be adopted as a power feeding structure to the electromagnetic solenoids 22A to 22C.
In addition, various design changes can be made within the scope of matters described in the claims.

DESCRIPTION OF SYMBOLS 3 ... Transmission drive device, 6 ... Transmission operation mechanism, 7 ... Gear housing, 10A, 10B, 10C ... Fork shaft, 12A, 12B, 12C ... Fork head, 15 ... Shift shaft, 15A ... Shift shaft, 15B ... Shift shaft , 16A, 16B, 16C ... internal lever, 17 ... central axis, 17A ... central axis, 17B ... central axis, 18A, 18B, 18C ... frame (main body), 19A, 19B, 19C ... actuator (plunger), 22A , 22B, 22C ... electromagnetic solenoid, 23 ... electric actuator (rotation drive means), 24 ... control unit (control means), 30 ... power feeding mechanism, 32A, 32B, 32C, 32D ... copper wiring (metal wiring), 33A, 33B , 33C, 33D ... lead member (connection structure), 42A, 42B, 42C, 42D ... copper wiring (metal wiring), D ... engagement position, D2 ... disengagement position, M1 ... axial direction (fork shaft 10A), M2 ... axial direction (fork shaft 10B), M3 ... axial direction (fork shaft 10C), M4 ... (shift select) Axial direction of the shafts 15 and 15A, M5... One direction of the rotational radius direction

Claims (5)

A transmission drive device for driving a transmission having a plurality of fork shafts and a fork head fixedly attached to an axial middle portion of each fork shaft,
A shift axis having a central axis;
Including an internal lever provided on the shift shaft corresponding to each fork head,
Each internal lever includes a main body fixed to a middle portion of the shift shaft, and an actuator supported on the main body so as to be movable along the rotational radius direction of the shift shaft with respect to the main body.
An engagement position where each actuator is engaged with the corresponding fork head, and an engagement release position which is located inward in the rotational radial direction from the engagement position and does not engage with the corresponding fork head. An actuator moving means for moving between,
And a rotation driving means for rotating the shift shaft around the central axis.   The transmission drive apparatus according to claim 1, wherein the actuator moving means includes an electromagnetic solenoid. The shift shaft is a hollow shaft;
The shift shaft includes a metal wire that is rotatably accommodated with the shift shaft and extends in the axial direction of the shift shaft, and a connection structure for electrically connecting the metal wire and each electromagnetic solenoid. The transmission drive device according to claim 1, further comprising a power feeding mechanism for feeding power from a power source to the plurality of electromagnetic solenoids through the metal wiring and the connection structure.   The metal shaft further includes a metal wiring that is disposed on an outer periphery of the shift shaft so as to be integrally rotatable with the shift shaft, extends in an axial direction of the shift shaft, and supplies power from a power source to the plurality of electromagnetic solenoids. The transmission drive apparatus according to 1 or 2. And further comprising control means for controlling the actuator moving means and the rotation driving means,
The control means retracts the actuator of the internal lever engaged with the fork head to the disengagement position, and at the same time the actuator of the internal lever not engaged with the fork head The transmission driving device according to any one of claims 1 to 4, wherein the actuator moving means is controlled so that the actuator moves to the engagement position.

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