JP2019173932A - Gear change mechanism - Google Patents

Abstract

To provide a gear change mechanism which is reducible and compactible in a size by shortening a power changeover mechanism in an axial direction which brings an input part and an output part into a fastening state or a release state.SOLUTION: A gear change mechanism comprises a power changeover mechanism 25 and an operation part 27. The power changeover mechanism is switched to a fastening state for transmitting the rotation power of a drive source to an output part from an input shaft by moving an input part M1 and a sleeve 31 to a fastening direction of the output part 10, or to an open state for making the rotation power from the input part to the output part non-transmittable by releasing the engagement of input-side dog teeth and output-side dog teeth by moving the sleeve to open directions of the input part and the output part. An operation part comprises a cam 41, a cam linkage mechanism 44 and a standby spring 54. The standby spring energizes the sleeve to the fastening direction when the power changeover mechanism is switched to the fastening state, and energizes the sleeve to the open direction when the power changeover mechanism is switched to the open state.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a speed change mechanism mounted on a vehicle or the like.

The four-wheel drive vehicle driving force distribution device disclosed in Patent Document 1 includes a sub-transmission that switches power from an input shaft to at least two stages of high speed and low speed and transmits the power to a main output shaft, and a sub-transmission that controls the sub transmission. A transmission hydraulic control system.
The hydraulic control system for the auxiliary transmission is provided in each of the second piston for moving the shift fork mounted on the shift rod to the switching position and the cylinder chamber formed on both sides of the second piston. A pair of electromagnetic switching valves that supply oil and de-energize and then drain the oil from the cylinder chamber, a position sensor that detects when the shift fork reaches the switching position, and a position sensor that detects the switching position of the shift fork A second controller that controls the switching valve.

  The shift rod of the auxiliary transmission hydraulic control system is provided with a waiting mechanism for biasing the shift fork in the switching direction. This waiting mechanism is a mechanism in which a coil spring is arranged on the outer periphery of the shift rod, and the shift fork is moved to the switching position to compress the coil spring and urge the shift fork in the switching direction.

JP 2008-114674 A

However, the coil spring arranged on the outer periphery of the shift rod requires a longer coil shaft length when the shift fork is urged to a predetermined stroke in the switching direction, and the shift rod shaft length becomes longer. However, there are problems in terms of miniaturization and compactness.
Therefore, an object of the present invention is to provide a miniaturized and compact speed change mechanism by shortening the axial direction of the power switching mechanism in which the input part and the output part are in a fastening state or an open state.

  In order to achieve the above object, a speed change mechanism according to an aspect of the present invention engages an input-side dog tooth and an output-side dog tooth by moving a sleeve in a fastening direction of an input portion and an output portion. The engagement of the input side dog teeth and the output side dog teeth is released by moving the sleeve in the fastening state in which the rotational power of the driving source can be transmitted to the output unit, or in the opening direction of the input unit and the output unit. A power switching mechanism that switches to an open state that disables transmission of rotational power from the input unit to the output unit, and a power switching mechanism that is disposed on an axis different from the direction in which the sleeve moves, And an operation unit for operating the open state. The operation portion has a cylindrical shape, a cam having a cam groove formed in the circumferential direction of the outer periphery, and a reversing mechanism that engages the cam groove with one end and moves the sleeve in a direction opposite to the moving direction of the cam groove. And a cam interlocking mechanism that is disposed in the cam interlocking mechanism, and urges the sleeve in the fastening direction when the power switching mechanism switches to the fastening state, and the sleeve in the opening direction when the power switching mechanism switches to the open state. A waiting spring for biasing.

  According to the speed change mechanism according to the present invention, it is possible to reduce the size and the compactness by shortening the axial direction of the power switching mechanism that puts the input portion and the output portion into a fastening state or an open state.

It is a skeleton figure of the speed change mechanism mounted in the vehicle concerning the present invention. It is a figure which shows the 1st and 2nd fastening opening part and operation part of the speed change mechanism which concern on this invention. It is a figure which shows the structure of the 1st fastening opening | release part which concerns on this invention. It is a perspective view which shows the operation part which concerns on this invention. It is the figure which showed the operation part which concerns on this invention from the side surface. (A) is the figure shown from the direction in alignment with the axis line of the operation part lever support rod which concerns on this invention, (b) is a BB arrow directional view of (a). It is an expanded view of the cam groove formed in the outer periphery of a shift cam. It is a figure which shows the open state of the 1st fastening open part which concerns on this invention. It is a figure which shows the fastening waiting state of the 1st fastening opening | release part which concerns on this invention. It is a figure which shows the fastening state of the 1st fastening opening | release part which concerns on this invention. It is a figure which shows the open waiting state of the 1st fastening open | release part which concerns on this invention.

Next, a first embodiment of the present invention will be described with reference to the drawings. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals. However, it should be noted that the drawings are schematic, and the relationship between the thickness and the planar dimensions, the ratio of the thickness of each layer, and the like are different from the actual ones. Therefore, specific thicknesses and dimensions should be determined in consideration of the following description. Moreover, it is a matter of course that portions having different dimensional relationships and ratios are included between the drawings.
The first embodiment described below exemplifies an apparatus and method for embodying the technical idea of the present invention, and the technical idea of the present invention is the material, shape, and structure of component parts. The arrangement is not specified below. The technical idea of the present invention can be variously modified within the technical scope defined by the claims described in the claims.

[Transmission mechanism of the first embodiment]
FIG. 1 shows a speed change mechanism mounted on a vehicle, in which a first shift mechanism 2 is disposed between a first drive source M1 and a first rotating element 1, and a second drive source M2 and a second A second shift mechanism 4 is arranged between the rotary element 3. Further, the gear 1 a of the first rotating element 1 and the gear 3 a of the second rotating element 3 are engaged with the gear 5 a of the third rotating element 5. The gear 5 a of the third rotating element 5 is connected to the differential device 6, and the axles 7 and 7 extending to the left and right of the vehicle are connected to the differential device 6.
The first shift mechanism 2 is a device for fastening or releasing the input shaft 10 of the first drive source M1 and the gear 1a of the first rotating element 1, and the second shift mechanism 4 is an input of the second drive source M2. This is a device for fastening or releasing the shaft 11 and the gear 3 a of the second rotating element 3.

[Configuration of first shift mechanism and second shift mechanism]
FIG. 2 shows a specific configuration of the first shift mechanism 2 and the second shift mechanism 4 arranged inside the case of the speed change mechanism. The first shift mechanism 2 and the second shift mechanism 4 The first fastening opening portion 25, the second fastening opening portion 26, and the operation portion 27 are configured.
The first fastening / opening portion 25 is a device that performs fastening / release operations of the input shaft 10 of the first drive source M1 and the gear 1a of the first rotating element 1. The second fastening / opening portion 26 is a device that fastens / releases the input shaft 11 of the second drive source M2 and the gear 3a of the second rotating element 3.

  FIG. 3 shows the first fastening opening 25, the first hub 30 fixed coaxially to the input shaft 10 of the first drive source M1, the outer peripheral spline teeth formed on the outer periphery of the first hub 30, and itself. The first shift sleeve 31 that is spline-coupled with the inner peripheral spline teeth formed on the inner periphery of the input shaft 10 and moves in the axial direction of the input shaft 10, and the first fork support rod 32 (FIG. 2) arranged parallel to the input shaft 10. And a first shift fork 33 that selects the operation of the shift sleeve 31 and is arranged so as to be movable in the axial direction of the input shaft 10.

The gear 1 a of the first rotating element 1 is rotatably disposed on the outer periphery of the input shaft 10, and gear side dog teeth 34 are formed on the axial end surface of the gear 1 a adjacent to the first shift sleeve 31. Further, sleeve side dog teeth 35 are also formed on the axial end face of the inner peripheral spline of the first shift sleeve 31 close to the gear 1a.
When the first shift fork 33 is operated, the first shift sleeve 31 moves in the axial direction toward the gear 1a, and the sleeve-side dog teeth 35 mesh with the gear-side dog teeth 34, whereby the input shaft 10 and the gear 1a are fastened. Done. On the other hand, when the first shift fork 33 is operated, the first shift sleeve 31 is moved in the axial direction away from the gear 1a, and the engagement of the sleeve side dog teeth 35 with the gear side dog teeth 34 is released. The opening operation of the shaft 10 and the gear 1a is performed.

  The second fastening / opening portion 26 is also a mechanism similar to the first fastening / opening portion 25, and a second hub (not shown) fixed coaxially to the input shaft 11 of the second drive source M2 and the second A second shift sleeve (not shown) that moves in the axial direction of the input shaft 11 by spline coupling between the outer peripheral spline teeth formed on the outer periphery of the hub and the inner peripheral spline teeth formed on the inner periphery thereof, and the input shaft 11 Is supported by a second fork support rod 36 (see FIG. 2) arranged in parallel with the second fork support rod 36 so as to be movable in the axial direction of the input shaft 11 of the second drive source M2, and selects the operation of the second shift sleeve. 2 shift forks 37.

The gear 3a of the second rotating element 3 is rotatably disposed on the outer periphery of the input shaft 11, and gear-side dog teeth (not shown) are formed on the axial end surface of the gear 3a adjacent to the second shift sleeve. Sleeve side dog teeth (not shown) are also formed on the axial end surface of the inner peripheral spline of the second shift sleeve adjacent to the gear 3a.
Then, by operating the second shift fork 37, the second shift sleeve moves in the axial direction toward the gear 3a, and the sleeve side dog teeth mesh with the gear side dog teeth, whereby the input shaft 11 and the gear 3a are engaged. On the other hand, when the second shift fork 37 is moved in the axial direction away from the gear 3a by the operation of the second shift fork 37 and the meshing of the sleeve side dog teeth with the gear side dog teeth is released, the input shaft 11 and An opening operation of the gear 3a is performed.

[Configuration of operation unit]
Next, FIG. 4 to FIG. 6A and FIG. 6B show the operation part 27 for operating the first fastening opening part 25 and the second fastening opening part 26.
As shown in FIG. 4, the operation unit 27 includes a shift cam 41 that is coaxially fixed to the operation shaft 40, first and second cam grooves 42 and 43 formed on the outer periphery of the shift cam 41, and one end of the first cam. A first cam interlocking mechanism 44 that engages with the groove 42 and has the other end engaged with the first shift fork 33 of the first fastening opening 25 and one end engaged with the second cam groove 43 and the other end Includes a second cam interlocking mechanism 45 engaged with the second shift fork 37 of the second fastening opening portion 26.

  As shown in FIGS. 4 and 5, the first cam interlocking mechanism 44 has a long plate-shaped first input lever 48 and first output lever 49, and the longitudinal lengths of the first input lever 48 and the first output lever 49. A lever rotation connecting portion 51 that connects the end portions in the direction so as to be rotatable around the axis of the lever support rod 50. Further, the first cam interlocking mechanism 44 includes an input side spring engagement pin 52 rising from the first input lever 48 near the lever rotation connecting portion 51 and a first output lever 49 to the input side spring engagement pin 52. The output side spring engaging pin 53 rising in parallel with the lever rotating connecting portion 51 and the pair of spring end portions 54a and 54b are connected to the input side spring engaging pin 52 and the output side spring engaging member. And a torsion spring 54 engaged with the mating pin 53.

The lever rotation connecting portion 51 has a structure shown in FIGS. 6 (a) and 6 (b).
That is, a substantially cylindrical rotation support member 55 is fixed to the outer periphery of the lever support rod 50. An annular convex portion 55a is formed on a part of the outer periphery of the rotation support member 55, and a sliding hole 49a formed in the end portion on the connection side of the first output lever 49 is slidable in the annular convex portion 55a. It is inserted.
A slide hole 48a formed at the end of the connection side of the first input lever 48 is slidably fitted on the outer periphery of the rotation support member 55 on one end side from the annular convex portion 55a. An annular fixing ring 56 that restrains the axial movement of the first input lever 48 is fixed to the outer periphery on the one end side of the rotation support member 55 from the connecting side end portion.

A cylindrical sleeve 57 around which a torsion spring 54 is wound is attached to the outer periphery of the rotation support member 55 on one end side from the annular convex portion 55a.
The sleeve 57 is formed of a pair of sleeve divided bodies 58 and 59 that are divided in two in the axial direction. The pair of sleeve divided bodies 58 and 59 are provided with flange portions 58a, 58 at both end positions that are separated from each other in the axial direction. 59a is formed. The E-ring 60 that is detachably fixed to the other end side of the rotation support member 55 constrains the axial movement of the sleeve 57 in contact with the collar portion 59a of the divided body 59.

  In order to mount the sleeve 57, first, one split body 58 is mounted on the outer periphery of the rotation support member 55 in a state where the collar portion 58a is in contact with the annular convex portion 55a, and then, the two torsion springs 54 are mounted. The torsion spring 54 is attached to the outer periphery of one sleeve divided body 58 so that the spring end portions 54a and 54b sandwich the input side spring engagement pin 52 and the output side spring engagement pin 53, and then the other end The sleeve division body 59 is mounted on the outer periphery of the rotation support member 55 so as to be coaxial with the one division body 58, and finally, the other end of the rotation support member 55 is brought into contact with the flange portion 59a of the other division body 59. Install the E-ring 60 on the side.

As described above, the lever rotation connecting portion 51 connects the first input lever 48 and the first output lever 49 so as to be rotatable around the axis of the lever support rod 50.
Here, as shown in FIG. 6A, the shaft centers of the input side spring engagement pin 52 and the output side spring engagement pin 53 are on a virtual line K <b> 1 orthogonal to the shaft center P of the lever support rod 50. When positioned, the two spring ends 54a and 54b of the torsion spring 54 sandwiching the input side spring engagement pin 52 and the output side spring engagement pin 53 do not open in a direction away from each other, and the torsion spring 54 generates an elastic restoring force with respect to the first input lever 48 and the second output lever 49 so that the engaging pins 52 and 53 are arranged on the virtual line K1.

  The second cam interlocking mechanism 45 is also a mechanism similar to the first cam interlocking mechanism 44. That is, as shown in FIGS. 5 and 6A and 6B, the long plate-shaped second input lever 61 and second output lever 62, and the second input lever 61 and second output lever 62 are provided. A lever rotation connecting portion 63 that connects the end portions in the longitudinal direction so as to be rotatable around the axis of the lever support rod 50; In addition, the second cam interlocking mechanism 45 includes an input side spring engagement pin 64 rising from the second input lever 61 near the lever rotation connecting portion 63 and a second output lever 62 to the input side spring engagement pin 64. And an output-side spring engagement pin 65 that rises in parallel. In the second cam interlocking mechanism 45, the pair of spring end portions 54 a and 54 b are engaged with the input side spring engagement pin 64 and the output side spring engagement pin 65 in a state of being wound around the lever rotation connecting portion 53. A torsion spring 54.

And the lever rotation connection part 63 of the 2nd cam interlocking mechanism 45 is the rotation support member 55, the cyclic | annular fixing ring 56, and 2 in the axial direction similarly to the lever rotation connection part 51 of the 1st cam interlocking mechanism 44. The second input lever 61 and the second output lever 62 are rotatably connected around the axis of the lever support rod 50.
The second cam interlocking mechanism 45 is also located on the imaginary line orthogonal to the axis of the lever support rod 50, although the axes of the input side spring engagement pin 64 and the output side spring engagement pin 65 are not shown. The two spring ends 54a, 54b of the torsion spring 54 sandwiching the input side spring engagement pin 64 and the output side spring engagement pin 65 are not opened in the direction of separating from each other, and the torsion spring 54 An elastic restoring force is generated with respect to the second input lever 61 and the second output lever 62 so that the engaging pins 64 and 65 are disposed on the virtual line K1.

Further, as shown in FIGS. 4 and 5, a first guide piece 66 that engages with the first cam groove 42 of the shift cam 41 is disposed at the tip of the first input lever 48 of the first cam interlocking mechanism 44. A second guide piece 67 that engages with the second cam groove 43 of the shift cam 41 is disposed at the tip of the second input lever 61 of the second cam interlocking mechanism 45.
Here, FIG. 7 shows the first cam groove 42 and the second cam groove 43 formed on the outer periphery of the shift cam 41 in a developed view.

  In FIG. 7, the position OP1 at which the first guide piece 66 of the first cam interlocking mechanism 44 engages with the first cam groove 42 of the shift cam 41 is the opening position of the first fastening opening portion 25 (hereinafter referred to as the first opening position OP1). The first cam in which the first guide piece 66 is moved in the axial direction of the shift cam 41 with respect to the first opening position OP1 by rotating the shift cam 41 in the forward and reverse directions to a predetermined angle by the operation of the operation shaft 40. A position CL1 of the groove 42 is a fastening position of the first fastening opening portion 25 (hereinafter referred to as a first fastening position CL1).

The position OP2 at which the second guide piece 67 of the second cam interlocking mechanism 45 engages with the second cam groove 43 is the opening position of the second fastening opening portion 26 (hereinafter referred to as the second opening position OP2). The position CL2 of the second cam groove 43 in which the second guide piece 67 is moved in the axial direction of the shift cam 41 with respect to the second opening position OP2 by rotating the shift cam 41 to a predetermined angle in the forward and reverse directions by the operation of the operation shaft 40. Is a fastening position of the second fastening opening portion 26 (hereinafter referred to as a second fastening position CL2).
The first opening position OP1 of the first cam groove 42 and the second opening position OP2 of the second cam groove 43 are set at the same circumferential position of the shift cam 41, and the first fastening position CL1 of the first cam groove 42 is set. The second fastening position CL2 of the second cam groove 43 is also set at the same circumferential position of the shift cam 41.

  Here, the first input unit described in the present invention corresponds to the first drive source M1, and the first output unit described in the present invention corresponds to the first rotating element 1, and The second input section described corresponds to the second drive source M2, the second output section described in the present invention corresponds to the second rotating element 3, and the sleeve described in the present invention The input-side dog teeth described in the present invention corresponding to the first shift sleeve 32 correspond to the sleeve-side dog teeth 35, and the output-side dog teeth described in the present invention are the gear-side dog teeth. Correspondingly, the first power switching mechanism described in the present invention corresponds to the first fastening opening portion 25, and the second power switching mechanism described in the present invention corresponds to the second fastening opening portion 26. The cam described in the present invention corresponds to the shift cam 41 and the waiting spring described in the present invention. It corresponds to the torsion spring 54.

[Operation of first fastening opening part]
With reference to FIGS. 7 to 11, the operation of the first fastening / opening portion 25 will be described. FIGS. 8A and 8B show the open state of the first fastening opening portion 25, FIGS. 9A and 9B show the waiting state for fastening of the first fastening opening portion 25, and FIG. , (B) shows the fastening state of the first fastening / opening portion 25, and FIGS. 11 (a) and 11 (b) show the waiting state for opening the first fastening / opening portion.
First, the operation | movement which switches the 1st fastening open | release part 25 from an open state to a fastening state is demonstrated.
8A and 8B, the first guide opening 66 of the first cam interlocking mechanism 44 shown in FIG. 7 is positioned at the first opening position OP 1 of the shift cam 41. It is the state when

  In the open state of the first fastening release portion 25, as shown in FIG. 8A, the first shift fork 33 is positioned at the neutral position and the first shift sleeve 31 is separated from the gear 1a. The side dog teeth 34 and the sleeve side dog teeth 35 are not engaged with each other. Further, as shown in FIG. 8B, the two spring end portions 54a and 54b of the torsion spring 54 sandwiching the input side spring engagement pin 52 and the output side spring engagement pin 53 are separated from each other. The torsion spring 54 does not generate elastic restoring force with respect to the first input lever 48 and the second output lever 49.

Next, as shown in FIG. 7, the first guide piece 66 of the first cam interlocking mechanism 44 is moved to the first engagement position CL <b> 1 of the shift cam 41 by rotating the shift cam 41 in the forward and reverse directions by operating the operation shaft 40. Located in.
When the first guide piece 66 moves to the first fastening position CL1 of the shift cam 41, the first input lever 48 rotates around the lever support rod 50 as shown in FIG. The input side spring engagement pin 52 that rotates together with the first input lever 48 moves the spring end portion 54b of the torsion spring 54 and opens the two spring end portions 54a and 54b away from each other. Generates an elastic restoring force to the first input lever 48 and the second output lever 49.

At this time, as the elastic restoring force of the torsion spring 54, as shown in FIG. 9B, a rotational force around the lever support rod 50 in the direction R1 acts on the second output lever 49.
When the rotational force R1 is applied to the second output lever 49, the first shift fork 33 engaged with the second output lever 49 and the first shift sleeve 31 engaged with the first shift fork 33 are moved to the gear 1a. Try to move axially to the side. Here, when the sleeve side dog teeth 35 and the gear side dog teeth 34 collide and do not mesh, the first shift fork 33 stops, but the elastic restoring force of the torsion spring 54 acts on the first shift sleeve 31, The sleeve side dog teeth 35 continue to push the gear side dog teeth 34.

  When the first shift sleeve 31 and the gear 1a are out of phase and the meshing positions of the sleeve-side dog teeth 35 and the gear-side dog teeth 34 coincide with each other, as shown in FIG. Due to the movement of the first shift fork 33 and the first shift sleeve 31 by force, the sleeve side dog teeth 35 and the gear side dog teeth 34 are engaged with each other, and the first fastening opening portion 25 is in a fastening state.

  In the fastening state of the first fastening opening portion 25, as shown in FIG. 10B, when the first output lever 49 rotates around the lever support rod 50, the output-side spring engagement pin 53 of the torsion spring 54. Moves to the side close to the input side spring engagement pin 52, and the two spring end portions 54a and 54b return to the same position as the fastening state of the first fastening opening portion 25, so that the torsion spring 54 has the first input. An elastic restoring force is generated with respect to the lever 48 and the second output lever 49 so that the engaging pins 52 and 53 are arranged on the imaginary line K1.

Therefore, as shown in FIG. 10A, the first fastening release portion 25 is in the fastening state, so that the power of the first drive source M1 can be transmitted to the first rotating element 10.
Next, an operation for switching the first fastening opening portion 25 from the fastening state to the opening state will be described.
First, the shift cam 41 is rotated from the first fastening position CL1 to the first release position OL1 in FIG.

  When the first guide piece 66 moves to the first fastening position CL1 of the shift cam 41, the first input lever 48 rotates around the lever support rod 50 as shown in FIG. The input side spring engagement pin 52 that rotates together with the first input lever 48 moves the spring end portion 54b of the torsion spring 54 and opens the two spring end portions 54a and 54b away from each other. Generates an elastic restoring force to the first input lever 48 and the second output lever 49.

At this time, as the elastic restoring force of the torsion spring 54, as shown in FIG. 11B, a rotational force around the lever support rod 50 in the direction R2 acts on the second output lever 49.
When the rotational force R2 acts on the second output lever 49, the first shift fork 33 engaged with the second output lever 49 and the first shift sleeve 31 engaged with the first shift fork 33 are moved to the gear 1a. Try to move in the axial direction away from. Here, when there is torque between the sleeve side dog teeth 35 and the gear side dog teeth 34, the first shift fork 33 does not move, so that the elastic restoring force of the torsion spring 54 acts on the first shift sleeve 31. Continue to work.

When the torque between the sleeve side dog teeth 35 and the gear side dog teeth 34 is released, the first shift fork 33 and the first shift sleeve 31 due to the elastic restoring force of the torsion spring 54 as shown in FIG. The sleeve-side dog teeth 35 are separated from the gear-side dog teeth 34 by the movement of, and the first fastening opening portion 25 is in an open state.
As a result, as shown in FIG. 8A, the first fastening opening portion 25 is in the open state, so that the power of the first drive source M1 cannot be transmitted to the first rotating element 10.

[Operation of Second Fastening Release]
The operation of switching the second fastening / opening portion 25 from the open state to the fastening state is performed simultaneously with the operation of the first fastening / opening portion 25. That is, when the first guide piece 66 of the first cam interlocking mechanism 44 shown in FIG. 7 is positioned from the first opening position OP1 of the first cam groove 42 of the shift cam 41 to the first fastening position CL1, the second guide The second guide piece 67 of the cam interlocking mechanism 45 is positioned from the second opening position OP2 of the second cam groove 43 of the shift cam 41 to the second fastening position CL2.

  Then, the second fastening opening portion 26 performs substantially the same operation as the operation of the first fastening opening portion 25, so that the gear side dog teeth formed on the gear 3a of the second rotating element 3 and the second shift sleeve The sleeve side dog teeth mesh with each other so that the power of the second drive source M2 can be transmitted to the second rotating element 3. At this time, when the sleeve side dog teeth of the second shift sleeve and the gear side dog teeth of the gear 3a collide with each other and do not mesh with each other, the second shift fork 37 stops, but the elastic restoring force of the torsion spring 54 is changed by the second shift fork. Acting on the sleeve, the sleeve side dog teeth continue to push the gear side dog teeth. Then, when the phases of the second shift sleeve and the gear 3a are shifted and the meshing positions of the sleeve side dog teeth and the gear side dog teeth coincide with each other, the second shift fork 37 and the second shift sleeve of the second shift sleeve are elastically restored by the torsion spring 54. By movement, the sleeve side dog teeth and the gear side dog teeth mesh with each other, and the power of the second drive source M2 can be transmitted to the second rotating element 3.

Further, in the operation of switching the second fastening opening portion 25 from the fastening state to the opening state, the first guide piece 66 of the first cam interlocking mechanism 44 shown in FIG. 7 is used for the first fastening of the first cam groove 42 of the shift cam 41. The second guide piece 67 of the second cam interlocking mechanism 45 is also moved from the second fastening position CL2 of the second cam groove 43 of the shift cam 41 to the second opening position OP2 at the same time when it is positioned from the position CL1 to the first opening position OP1. To position.
The second fastening / opening portion 26 performs substantially the same operation as the operation of the first fastening / opening portion 25, so that the power of the second drive source M <b> 2 cannot be transmitted to the second rotating element 3.

[Effects of first shift mechanism and second shift mechanism]
Next, effects of the first shift mechanism 21 and the second shift mechanism 22 of the first embodiment will be described.
The operation unit 27 constituting the first shift mechanism 21 and the second shift mechanism 22 has an elastic restoring force of the torsion spring 54 acting on the first shift sleeve 31 when the first cam interlocking mechanism 44 is switched to the fastening state. The sleeve side dog teeth 35 continue to push the gear side dog teeth 34. Further, when the first cam interlocking mechanism 44 is switched to the open state, the elastic restoring force of the torsion spring 54 acts on the first shift sleeve 31 so that the sleeve side dog teeth 35 are separated from the gear side dog teeth 34.

Further, when the second fastening / opening portion 26 constituting the operation portion 27 is switched to the fastening state, the sleeve-side dog teeth continue to push the gear-side dog teeth by the elastic restoring force of the torsion spring 54 and are switched to the opened state. Also, the sleeve side dog teeth act so as to be separated from the gear side dog teeth by the elastic restoring force of the torsion spring 54.
The torsion spring 54 used in the first cam interlocking mechanism 44 is a lever support that extends in a direction orthogonal to the direction in which the first shift fork 33 and the first shift sleeve 31 of the first fastening opening 25 move. It arrange | positions in the state wound around the rod 50. FIG. The torsion spring 54 used in the second cam interlocking mechanism 45 also has a lever that extends in a direction perpendicular to the direction in which the second shift fork 37 and the second shift sleeve of the second fastening opening portion 26 move. It arrange | positions in the state wound around the support rod 50. FIG.

As described above, in the first embodiment, the torsion spring 54 functioning as a waiting spring in the fastened state and the open state of the first and second fastening opening portions 25 and 26 is provided in the first and second fastening opening portions 25 and 26. Since the shift fork 33 and the first shift sleeve 31 are disposed on the lever support rod 50 in a direction different from the direction in which the shift fork 33 and the first shift sleeve 31 move, the length of the first and second fastening release portions 25 and 26 in the moving direction is short. Can be achieved.
Further, in order to increase the elastic restoring force of the torsion spring 54 that functions as a waiting spring, the spring diameter may be increased, and a small part can be provided.

Therefore, by using the torsion spring 54 as a waiting spring in the fastening state and the open state of the first and second fastening opening portions 25 and 26, a small and compact device can be provided.
Further, the first input lever 48 and the first output lever 49 of the first cam interlocking mechanism 44 and the second input lever 61 and the second output lever 62 of the second cam interlocking mechanism 45 are connected to the lever support rod 50 of the same member. Since it is rotatably supported, the number of parts can be reduced.

  Further, the spring end portions 54 a and 54 b are engaged with the input side spring engagement pin 52 provided on the first input lever 48 of the first cam interlocking mechanism 44 and the output side spring engagement pin 53 provided on the first output lever 49. Since the torsion spring 54 is disposed on the lever support rod 50 in the combined state, rattling of the first input lever 48 and the first output lever 49 can be prevented.

  Further, the spring end portions 54 a and 54 b are engaged with the input side spring engagement pin 64 provided on the second input lever 61 of the second cam interlocking mechanism 45 and the output side spring engagement pin 65 provided on the second output lever 62. Since the torsion spring 54 is disposed on the lever support rod 50 in the combined state, rattling of the second input lever 61 and the second output lever 62 can be prevented.

  Further, the shift cam 41 of the operation portion 27 is formed with a first cam groove 42 and a second cam groove 43 that are spaced apart from each other in the axial direction in the circumferential direction of the outer periphery. The first guide piece 66 disposed on the first input lever 48 of the mechanism 44 is engaged, and the second guide piece 67 disposed on the second input lever 48 of the second cam interlocking mechanism 45 is engaged with the second cam groove 43. Therefore, the number of parts can be further reduced.

DESCRIPTION OF SYMBOLS 1 1st rotation element 1a Gear 2 1st shift mechanism 3 2nd rotation element 3a Gear 4 2nd shift mechanism 5 3rd rotation element 5a Gear 6 Differential gear 7 Axle 10 Input shaft 11 Input shaft M1 1st drive source M2 1st 2 Drive source 25 First fastening release portion 26 Second fastening release portion 27 Operation portion 30 First hub 31 First shift sleeve 32 First fork support rod 33 First shift fork 34 Gear side dog teeth 35 Sleeve side dog teeth 36 First 2 fork support rod 37 second shift fork 41 shift cams 42, 43 first and second cam grooves 44 first cam interlocking mechanism 45 second cam interlocking mechanism 48 first input lever 49 first output levers 48a, 49a sliding hole 50 Lever support rod 51 Lever rotation connecting portion 52 Input side spring engagement pin 53 Output side spring engagement pin 54 Torsion spring 54 a, 54b Spring end portion 55 Rotating support member 55a Annular convex portion 56 Annular fixing ring 57 Sleeve 58, 59 Sleeve split body 58a, 59a Eaves portion 60 E ring 61 Second input lever 62 Second output lever 63 Lever turning connection portion 64 Input side spring engagement pin 65 Output side spring engagement pin 66 First guide piece 67 Second guide piece OP1 First release position CL1 First engagement position OP2 Second release position CL2 Second engagement position

Claims (4)

A fastening state in which the input side dog teeth and the output side dog teeth are engaged by moving the sleeve in the fastening direction of the input part and the output part, and the rotational power of the drive source from the input part can be transmitted to the output part, Alternatively, the meshing of the input-side dog teeth and the output-side dog teeth is released by moving the sleeve in the opening direction of the input unit and the output unit, and rotational power is transmitted from the input unit to the output unit. A power switching mechanism that switches to an open state that is impossible;
An operation unit that is disposed on an axis different from a direction in which the sleeve of the power switching mechanism moves, and that operates a fastening state and an open state of the power switching mechanism;
The operation unit is
A cam having a cylindrical shape and a cam groove formed in the circumferential direction of the outer periphery;
A cam interlocking mechanism having a reversing mechanism in which one end is engaged with the cam groove and the sleeve is moved in a direction opposite to the moving direction of the cam groove;
Arranged in the cam interlocking mechanism, the sleeve is biased in the fastening direction when the power switching mechanism is switched to the fastening state, and the sleeve is biased in the opening direction when the power switching mechanism is switched to the open state. And a waiting spring. The cam interlocking mechanism is
A lever support rod having an axis extending in a direction different from a direction in which the sleeve of the power switching mechanism moves;
An input lever and an output lever;
A lever rotation connecting portion that connects end portions in the longitudinal direction of the input lever and the output lever so as to be rotatable around an axis of the lever support rod;
An input side spring engagement pin rising from the input lever near the lever rotation connecting portion;
An output-side spring engagement pin rising from the output lever alongside the input-side spring engagement pin, and
The waiting spring is
A pair of spring ends that are engaged with the input side spring engagement pin and the output side spring engagement pin in a state of being sandwiched between the pair of spring end portions in a state of being wound around the lever rotation connecting portion,
The torsion spring is elastic when the pair of spring ends are separated from each other by the rotation of the input side spring engagement pin when the power switching mechanism is switched to the fastening state or the open state. Generate resilience,
When the power switching mechanism is switched to the fastening state, the elastic restoring force acts in a direction to bias the sleeve in the fastening direction, and when the power switching mechanism is switched to the open state, the sleeve is biased in the opening direction. The speed change mechanism according to claim 1, wherein the elastic restoring force acts in a direction. The power switching mechanism includes a first power switching mechanism that switches a first input unit and a first output unit between a fastening state and an open state, and a second power that switches a second input unit and a second output unit between a fastening state and a release state. A switching mechanism,
The cam interlocking mechanism of the operation unit includes a first cam interlocking mechanism in which a first input lever and a first output lever are rotatably connected to the lever support rod, and a second input lever and a second output lever. The speed change mechanism according to claim 2, further comprising a second cam interlocking mechanism rotatably connected to the lever support rod.   The cam of the operating portion is formed with a first cam groove and a second cam groove that are spaced apart from each other in the axial direction in the circumferential direction of the outer periphery, and the first cam interlocking mechanism has the first cam groove. The first input lever is engaged, and the second input lever of the second cam interlocking mechanism is engaged with the second cam groove at the first cam groove circumferential reference position in the previous period. Item 4. The speed change mechanism according to item 3.

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