JP2017057992A - Change device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a change device capable of improving responsiveness in changing a power transmission path.SOLUTION: A first engagement portion 110 is engaged with a cam groove 103 of a drum 101, and a fork 112 (first moving member) is moved in an axial direction of the drum 101. In changing a power transmission path of a transmission 1 (power transmission device), the drum 101 is rotated in a state that the first engagement portion 110 is separated from the cam groove 103 by a switch device 121, and then the first engagement portion 110 is engaged with the cam groove 103. As a position and a moving path of the fork 112 can be made independent from the cam groove 103 by the switch device 121, the responsiveness in changing the power transmission path can be improved.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a changing device connected to a power transmission device, and more particularly to a changing device capable of improving responsiveness when changing a power transmission path.

  In general, a power transmission device such as a transmission or a transfer that transmits an output of a power source such as an engine mounted on a vehicle to a driving wheel appropriately transmits power to the driving wheel according to a traveling state of the vehicle. A change device such as a shift mechanism for changing the transmission path is connected. The changing device includes a drum having a cam groove formed on the outer peripheral surface thereof, and a moving member such as a shift fork is moved along the cam groove by rotation of the drum, and the power transmission path in the power transmission device is sequentially moved by the moving member. What is changed to (Patent Document 1) is known.

Japanese Utility Model Publication No. 61-64096

  However, in the technique disclosed in Patent Document 1, when the power transmission path of the power transmission device is changed, the moving member sequentially moves along the cam groove as the drum rotates. Since the sequential movement path of the moving member by the cam groove cannot be short-circuited, there is a problem that the response cannot be improved.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a changing device capable of improving the responsiveness when changing the power transmission path.

Means for Solving the Problems and Effects of the Invention

  In order to achieve this object, the change device according to claim 1 is connected to a power transmission device disposed on a power transmission path between the power source and the drive wheels, and has a cam on the outer peripheral surface. The drum in which the groove is formed is rotated around the axis by the drum driving device. The first engagement portion engages with the cam groove, and the first engagement portion is guided by the cam groove, so that the first moving member moves in the axial direction of the drum, and the power transmission path in the power transmission device is established. change. When changing the power transmission path of the power transmission device, the drum driving device rotates the drum with the switching device disengaging the first engagement portion from the cam groove, and then the switching device sets the first groove in the cam groove. Engage the engaging part. Since the position and movement path of the first moving member can be made independent of the cam groove by the switching device, there is an effect that the responsiveness can be improved when the power transmission path is changed by the power transmission device.

  According to the change device of the second aspect, in the switching device, the drive shaft arranged on the outer side in the radial direction of the drum along with the drum is rotated around the axis by the drive device. The first link linked to the rotation of the drive shaft switches between engagement of the cam groove and the first engagement portion and separation of the first engagement portion from the cam groove. Since the drive shaft is arranged alongside the drum, in addition to the effect of the first aspect, there is an effect that the changing device can be miniaturized.

  According to the changing device of the third aspect, the support shaft that is movable in the axial direction is arranged side by side with the drive shaft, and the first moving member is coupled thereto. The first link is coupled to the drive shaft, and a claw portion protruding outward in the radial direction of the drive shaft interferes with the first engagement portion, and the boss portion is immovable in the axial direction of the support shaft. The first engagement portion is fixed to the support shaft so as to be swingable in the circumferential direction. In addition to the effect of the second aspect, the claw portion and the boss portion have an effect that the switching between the engagement of the cam groove and the first engagement portion and the detachment of the first engagement portion from the cam groove can be quickly performed.

  According to the change device of the fourth aspect, the first link has the spring urges the boss portion in the engagement direction in which the first engagement portion engages with the cam groove, and the claw portion has the first engagement. A load is applied to the spring while the boss part is swung in the disengagement direction opposite to the engagement direction by interfering with the part. Therefore, in addition to the effect of Claim 3, there exists an effect which can simplify the structure of a 1st link.

  According to the changing device of the fifth aspect, the second engaging portion that engages with the cam groove is guided by the cam groove, so that the second moving member moves in the axial direction of the drum and Change the power transmission path. In the switching device, the linkage shaft is arranged side by side with the drive shaft, and an intervening portion interposed between the linkage shaft and the drive shaft transmits the rotation of the drive shaft to the linkage shaft, and is linked to the rotation of the linkage shaft. By the link, the engagement between the cam groove and the second engagement portion and the detachment of the second engagement portion from the cam groove are switched. Since the rotation of the drive shaft by the drive device can be transmitted to the linkage shaft by the interposition part, in addition to the effect of claim 2, there is an effect that a separate drive device for rotating the linkage shaft can be dispensed with.

  According to the change device of the sixth aspect, since the rotation of the drive shaft and the linkage shaft by a predetermined amount or more is restricted by the restriction part provided in the interposition part, the second part from the cam groove can be provided without providing a stopper member separately. The separation heights of the first and second engagement portions and the engagement depths of the first and second engagement portions with respect to the cam groove can be limited. Therefore, in addition to the effect of claim 5, the configuration of the apparatus can be simplified.

It is a skeleton figure of the power transmission device with which the change apparatus in one embodiment of this invention was connected. It is a perspective view of a change device. It is a perspective view of a 1st engaging part. It is a side view of a 1st engaging part. It is a front view of the change apparatus which the 1st engaging part and the 2nd engaging part engaged with the cam groove. It is a front view of the change apparatus which the 1st engagement part and the 2nd engagement part removed from the cam groove.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. First, a power transmission device to which a changing device 100 according to an embodiment of the present invention is connected will be described with reference to FIG. FIG. 1 is a skeleton diagram of a transmission 1 (power transmission device) to which a changing device 100 is connected. The transmission 1 includes an input shaft 2 to which power is input and an output shaft 3 disposed in parallel with the input shaft 2, and an output gear 4 is disposed on the output shaft 3. In the present embodiment, transmission 1 is mounted on an automobile and is disposed on a power transmission path between a power source 5 such as an engine and drive wheels (not shown). The transmission 1 is a meshing type transmission (sequential type transmission) having seven forward speeds and one reverse speed.

  The input shaft 2 is coupled to the power source 5 via the clutch 6. The rotational driving force of the power source 5 is input to the input shaft 2 by the engagement operation of the clutch 6. The output shaft 3 transmits a rotational driving force to a driving wheel (not shown) via an output gear 4 via a propeller shaft (not shown). The input shaft 2 and the output shaft 3 are a first speed gear 10, a second speed gear 20, a third speed gear 30, a fourth speed gear 40, a fifth speed gear 50, a sixth speed gear 60, and a plurality of speed change gears (forward speeds). The seventh speed gear 70 and the reverse gear 80 as the reverse gear are supported.

  The first-speed gear 10 includes a drive gear 11 that is fixed to the input shaft 2 so as not to rotate relative to the input shaft 2, and a driven gear 12 that is engaged with the drive gear 11 and fixed to the output shaft 3 so that relative rotation is possible. Includes a drive gear 21 fixed to the input shaft 2 so as not to rotate relative to the input shaft 2, and a driven gear 22 engaged with the drive gear 21 and fixed to the output shaft 3 so as to be rotatable relative to the output shaft 3. The third speed gear 30 includes a drive gear 31 that is fixed to the input shaft 2 so as not to rotate relative to the input shaft 2, and a driven gear 32 that is engaged with the drive gear 31 and fixed to the output shaft 3 so as to be relatively rotatable. Includes a drive gear 41 fixed to the input shaft 2 so as to be relatively rotatable and a driven gear 42 meshed with the drive gear 41 and fixed to the output shaft 3 so as not to be relatively rotatable. The fifth speed gear 50 includes a drive gear 51 fixed to the input shaft 2 so as to be relatively rotatable, and a driven gear 52 meshed with the drive gear 51 and fixed to the output shaft 3 so as not to be relatively rotatable. Includes a drive gear 61 fixed to the input shaft 2 so as to be relatively rotatable and a driven gear 62 meshed with the drive gear 61 and fixed to the output shaft 3 so as not to be relatively rotatable. The seventh gear 70 includes a drive gear 71 fixed to the input shaft 2 so as to be relatively rotatable, and a driven gear 72 meshed with the drive gear 71 and fixed to the output shaft 3 so as not to be relatively rotatable. The drive gear 81 is fixed to the input shaft 2 so as not to be relatively rotatable, the driven gear 82 is fixed to the output shaft 3 so as to be relatively rotatable, and the idler gear 84 meshes with the drive gear 81 and the driven gear 82.

  The hub 90 is relative to the output shaft 3 between the driven gears 12 and 32, the output shaft 3 between the driven gears 22 and 82, the input shaft 2 between the drive gears 41 and 61, and the input shaft 2 between the drive gears 51 and 71, respectively. It is a member fixed so as not to rotate. The driven gears 12, 22, 32, 82 and the drive gears 41, 51, 61, 71 have axially projecting dogs (teeth) 13, 23, 33, 43, 53, 63, 73, 83 in the axial direction. It is provided on each of the opposing end faces. The dog sleeve 91 is a member that is attached to the hub 90 so as to be relatively movable in the axial direction while engaging with the outer periphery of the hub 90, and a dog (tooth) that protrudes in the axial direction is provided on an end surface in the axial direction.

  When the dog sleeve 91 is positioned in a neutral state where it does not mesh with any of the dogs 13, 23, 33, 43, 53, 63, 73, 83, the transmission 1 is set to neutral. The dog sleeve 91 selectively moves in the axial direction and meshes with any of the dogs 13, 23, 33, 43, 53, 63, 73, 83, so that the first gear 10, the second gear 20, the third gear 30, Any of the fourth speed gear 40, the fifth speed gear 50, the sixth speed gear 60, the seventh speed gear 70, and the reverse gear 80 is selectively coupled to the input shaft 2 to perform a shift.

  The changing device 100 is a device for selectively moving the dog sleeve 91 in the axial direction, and includes a cylindrical drum 101 (cylindrical cam) in which cam grooves 102, 103, 104, and 105 are formed on the outer peripheral surface, and a drum A drum driving device 106 (motor) that rotates the shaft 101 around an axis, and support shafts 108, 111, 114, and 117 arranged in parallel to the input shaft 2 and the output shaft 3 are provided. The support shafts 108, 111, 114, 117 include the first engaging portions 110, 116 and the second engaging portions 107, 113, the forks 112, 118 (first moving member), and the forks 109, 115 (second moving member). ) And each. The first engaging portions 110 and 116 and the second engaging portions 107 and 113 are engaged with the cam grooves 102, 103, 104, and 105, respectively, and the forks 109, 112, 115, and 118 are respectively disposed on the outer circumferences of the plurality of dog sleeves 91. Engage.

  The drum 101 is driven to rotate about its axis by a drum driving device 106 based on an operation signal of a shift lever (not shown) or an accelerator opening degree and a vehicle speed signal by an operation of an accelerator pedal (not shown). . When the drum 101 rotates, the first engagement portions 110 and 116, the second engagement portions 107 and 113, and the support shafts 108, 111, 114, and 117, which are engaged with the cam grooves 102, 103, 104, and 105, respectively. The forks 109, 112, 115, 118 sequentially move in the axial direction. The forks 109, 112, 115, 118 are sequentially moved according to the position of the rotating drum 101, and the dog sleeve 91 is sequentially moved in the axial direction accordingly.

  The structure of the changing device 100 will be described with reference to FIG. FIG. 2 is a perspective view of the changing device 100. In FIG. 2, the cam grooves 102, 103, 104, and 105 are shown in an annular shape for convenience. The changing device 100 includes an engagement between the cam grooves 102, 103, 104, and 105, the first engaging portions 110 and 116, and the second engaging portions 107 and 113 (see FIGS. 5 and 6), the cam grooves 102, A switching device 121 is provided for switching between the first engaging portions 110 and 116 and the second engaging portions 107 and 113 being disengaged from the 103, 104, and 105. Since the pinion 120 that rotates integrally with the output shaft of the drum driving device 106 meshes with the gear 119 provided on the outer peripheral surface of the drum 101, the drum 101 rotates by driving the drum driving device 106.

  The switching device 121 includes a drive shaft 122 and a linkage shaft 124 that are arranged side by side with the drum 101, a first link 130 and 140 that are arranged on the support shafts 111 and 117, and a drive shaft 122 and a linkage shaft 124, respectively. , And second links 160 and 170 disposed on the support shafts 108 and 114, respectively. Both ends of the drive shaft 122 and the linkage shaft 124 are rotatably supported by a case (not shown) of the switching device 100. Support shafts 108, 111, 114, and 117 are supported by the case so that both ends thereof are movable in the axial direction.

  The drive shaft 122 is a member that is disposed along the axial direction of the drum 101 and that is disposed coaxially with the output shaft of the drive device 123 (motor) that can rotate forward and backward, and is integrated with the output shaft of the drive device 123. Rotate. The first link 130 is a mechanism that switches between engagement of the cam groove 103 and the first engagement portion 110 and disengagement of the first engagement portion 110 from the cam groove 103 in conjunction with rotation of the drive shaft 122. . The first link 140 is a mechanism that switches between engagement of the cam groove 105 and the first engagement portion 116 and disengagement of the first engagement portion 116 from the cam groove 105 in conjunction with rotation of the drive shaft 122. .

  The first engaging part 110 and the first link 130 will be described with reference to FIGS. 3 and 4. FIG. 3 is a perspective view of the first engaging portion 110. FIG. 4 is a side view of the first engagement portion 110, showing the first engagement portion 110 as viewed from the drum 101 side. The first engaging portion 116, the second engaging portions 107, 113, the first link 140, and the second links 160, 170 are configured in the same manner as the first engaging portion 110 or the first link 130. Therefore, the same reference numerals as those of the first engaging portion 110 or the first link 130 are attached, and the first engaging portion 116, the second engaging portions 107 and 113, the first link 140, and the second link 160 are provided. , 170 will not be described in detail.

  As shown in FIG. 3, the first engagement portion 110 includes a bracket 110a formed in a curved plate shape, and an engagement pin 110b attached to the bracket 110a. The bracket 110 a is coupled to the boss portion 131, and the engagement pin 110 b is engaged with the cam groove 103. The first link 130 is coupled to the drive shaft 122, a boss portion 131 attached to the support shaft 111 having a circular cross section, a spring (torsion spring) 136 that applies a biasing force toward the circumferential direction of the support shaft 111 to the boss portion 131. And a claw portion 137 that protrudes outward in the radial direction of the drive shaft 122.

  As shown in FIG. 4, the boss 131 has a hole 132 through which the support shaft 111 is inserted. The hole 132 is formed in a circular cross section whose inner diameter is slightly larger than the outer diameter of the support shaft 111. In the boss 131, a groove 133 extending in the circumferential direction of the support shaft 111 in a state where the support shaft 111 is inserted into the hole 132 is continuously formed in the hole 132. A rod-shaped pin 134 that protrudes from the support shaft 111 toward the outer side in the radial direction of the support shaft 111 is inserted into the groove 133. The groove 133 is set to have a width (axial dimension) substantially the same as the thickness of the pin 134, and a length (circumferential dimension) larger than the thickness of the pin 134. Therefore, the boss 131 is fixed to the support shaft 111 so that it cannot move in the axial direction of the support shaft 111 and can swing in the circumferential direction of the support shaft 111.

  Returning to FIG. The support shaft 111 is provided with a locking portion 135 that protrudes outward in the radial direction in the vicinity of the boss portion 131. The locking part 135 is a part where the end part of the spring 136 is fixed to the bracket 110a. The spring 136 urges the bracket 110 a and the boss 131 around the support shaft 111 in the direction in which the engagement pin 110 b is pressed against the cam groove 103. The bracket 110 a urged in the circumferential direction of the support shaft 111 by the spring 136 abuts on the claw portion 137 coupled to the drive shaft 122. When the bracket 110 a comes into contact with the claw portion 137 and the rotation of the drive shaft 122 is restricted against the biasing force of the spring 136, the position of the engagement pin 110 b in the depth direction of the cam groove 103 is determined.

  The width of the bracket 110a (the dimension in the axial direction of the drum 101) is set such that the claw portion 137 can contact the bracket 110a in the entire movement range of the bracket 110a that moves in the axial direction together with the support shaft 111. The This is to prevent the bracket 110a from falling off the claw portion 137 in the entire movement range of the bracket 110a in the axial direction.

  Returning to FIG. 2, the first engaging portion 116 and the first link 140 will be described. The first engagement portion 116 includes a bracket 116a (see FIG. 6) formed in a plate shape that is longer than the bracket 110a and is bent, and an engagement pin 116b attached to the bracket 116a. The first link 140 is coupled to the drive shaft 122, a boss portion 141 that is swingably attached to the support shaft 117, a spring (torsion spring) 146 that applies a biasing force in the circumferential direction of the support shaft 117 to the boss portion 141. And a claw portion 147 that protrudes outward in the radial direction of the drive shaft 122. A spring 146 disposed between the locking portion 145 and the bracket 116a is provided with a bracket 116a (see FIG. 5) and a boss portion 141 around the support shaft 117 in the direction in which the engagement pin 116b is pressed against the cam groove 105. Rush. The bracket 116 a biased by the spring 146 abuts on the claw portion 147 coupled to the drive shaft 122.

  The interposition part 150 will be described with reference to FIG. FIG. 5 is a front view of the changing device 100 in which the first engaging portion 110 and the second engaging portion 107 are engaged with the cam grooves 102 and 103 (viewed from the axial direction of the drum 101). In FIG. 5, illustration of the drum driving device 106, the driving device 123, and the forks 109, 112, 115, and 118 is omitted for easy understanding. The interposition part 150 is a member for transmitting the rotation of the drive shaft 122 to the linkage shaft 124, and includes a first member 151 coupled to the drive shaft 122 and a second member 155 coupled to the linkage shaft 124. .

  The first member 151 includes a main body 152 extending outward in the radial direction of the drive shaft 122 and a pair of convex portions 153 and 154 protruding from the tip of the main body 152. The convex portions 153 and 154 are provided at the distal end of the main body 152 at intervals in the circumferential direction, and the inner walls 153a and 154a facing each other are set substantially parallel to each other.

  The second member 155 includes a main body 156 that extends outward in the radial direction of the linkage shaft 124, and a protrusion 158 that protrudes vertically from the center of the front end surface 157 of the main body 156. The protrusion 158 is a portion that is inserted into the inner walls 153a and 154a of the first member 151, and is formed in a substantially circular shape when viewed from the axial direction (the vertical direction in FIG. 5). The diameter of the protrusion 158 is set to be approximately the same as the distance between the inner walls 153a and 154a so that the protrusion 158 and the inner walls 153a and 154a rub against each other. The protrusion 158 is inserted into the inner walls 153a and 154a, whereby the protrusion 158 and the protrusions 153 and 154 are engaged. The protruding length of the protrusion 158 from the distal end surface 157 is set to be approximately the same as the length of the convex portions 153 and 154 protruding from the main body 152 of the first member 151.

  The linkage shaft 124 couples the claw portions 167 and 177 constituting a part of the second links 160 and 170 (see FIG. 2) with an interval in the axial direction. The claw portions 167 and 177 (see FIG. 5) abut on brackets 107a and 113a that constitute a part of the second engaging portions 107 and 113. The brackets 107a and 113a and the boss portions 161 and 171 to which the brackets 107a and 113a are coupled are pushed in the direction in which the engaging pins 107b and 113b are pressed against the cam grooves 102 and 104 (see FIG. 2) by the springs 166 and 176 (torsion spring). Be energized.

  The operation of the switching device 121 will be described with reference to FIGS. FIG. 6 is a front view of the changing device 100 in which the first engaging portions 110 and 116 and the second engaging portions 107 and 113 are detached from the cam grooves 102, 103, 104, and 105. When the first engaging portions 110 and 116 and the second engaging portions 107 and 113 are engaged with the cam grooves 102, 103, 104, and 105 (see FIG. 2) (see FIG. 5), the spring driving device 123 is driven. When the drive shaft 122 is rotated in a predetermined direction (counterclockwise in FIG. 5), the brackets 110a and 116a are pushed against the elastic force of the springs 136 and 146 by the claws 137 and 147 rotating together with the drive shaft 122. Move away from the drum 101. As a result, the engaging pins 110b and 116b are detached from the cam grooves 103 and 105 (see FIG. 6).

  Simultaneously with the rotation of the drive shaft 122 and the claw portions 137 and 147, the first member 151 also rotates with the drive shaft 122. When the first member 151 rotates in a predetermined direction (counterclockwise in FIG. 5), the second member 155 is moved in the opposite direction (clockwise in FIG. 5) by the projection 158 engaged with the convex portions 153 and 154. Rotate. Accordingly, the linkage shaft 124 to which the second member 155 is coupled is rotated and pushed by the claw portions 167 and 177 rotating together with the linkage shaft 124, and the brackets 107 a and 113 a are resisted against the elastic force of the springs 166 and 176. Get away from. As a result, the engaging pins 107b and 113b are detached from the cam grooves 102 and 104 (see FIG. 6).

  When the protrusion 154 comes into contact with the front end surface 157 of the second member 155 in a state where the protrusion 158 is in contact with the inner walls 153a and 154a, further rotation of the drive shaft 122 and the linkage shaft 124 is restricted. Accordingly, the separation height of the engagement pins 107b, 110b, 113b, and 116b from the cam grooves 102, 103, 104, and 105 can be limited without providing a separate stopper member.

  From this state, in order to engage the first engaging portions 110, 116 and the second engaging portions 107, 113 with the cam grooves 102, 103, 104, 105, the driving device 123 is driven to move the driving shaft 122 in a predetermined direction ( When it rotates clockwise (FIG. 6), the claw portions 137 and 147 that rotate together with the drive shaft 122 approach the drum 101. Since the brackets 110a and 116a approach the drum 101 by the restoring force of the springs 136 and 146, the engagement pins 110b and 116b engage with the cam grooves 103 and 105 (see FIG. 5).

  Simultaneously with the rotation of the drive shaft 122 and the claw portions 137 and 147, the first member 151 also rotates with the drive shaft 122. When the first member 151 is rotated in a predetermined direction (clockwise in FIG. 6), the second member 155 is moved in the direction opposite to the first member 151 (counterclockwise in FIG. 6) by the projection 158 engaged with the convex portions 153 and 154. Rotate. Accordingly, the linkage shaft 124 to which the second member 155 is coupled rotates, and the claw portions 167 and 177 that rotate together with the linkage shaft 124 approach the drum 101. Since the brackets 107a and 113a approach the drum 101 by the restoring force of the springs 166 and 176, the engagement pins 107b and 113b engage with the cam grooves 102 and 104 (see FIG. 5).

  When the protrusion 153 comes into contact with the front end surface 157 of the second member 155 in a state where the protrusion 158 is in contact with the inner walls 153a and 154a, further rotation of the drive shaft 122 and the linkage shaft 124 is restricted. Thereby, the engagement depth of the engagement pins 107b, 110b, 113b, and 116b to the cam grooves 102, 103, 104, and 105 can be limited without providing a separate stopper member.

Next, with reference to FIG.1 and FIG.2, the usage method of the transmission 1 to which the change apparatus 100 was connected is demonstrated. Since the transmission 1 is a sequential transmission mechanism, depending on the position of the drum 101 (cylindrical cam), when shifting up, 1st speed → neutral (hereinafter referred to as “N”) → 2nd speed → N → 3rd speed → N → 4th speed → N → 5th speed → N → 6th speed → N → 7th speed is sequentially switched. Similarly, when downshifting, 7th gear → N → 6th gear → N ^* → 5th gear → N ^** → 4th gear → N → 3rd gear → N ^x → 2nd gear → N ^xx → 1st gear The stage switches (subscripts such as ^* and ^x are added for later explanation). Here, a skip shift that shifts gears by skipping adjacent gears will be described by taking a downshift from the fifth speed to the second speed as an example.

The fifth speed is realized by engaging the dog sleeve 91 (see FIG. 1) and the dog 53 with the drum 101 in the fifth speed position. In order to perform a skip shift from the fifth speed to the second speed, first, after the clutch 6 is disengaged, the drum driving device 106 is driven to slightly rotate the drum 101, and the position of the drum 101 is changed to N ^* next to the fifth speed ^. Or N ^** (the neutral state where the dog sleeve 91 does not mesh with the dog 53). Next, the driving device 123 (see FIG. 2) is driven to rotate the driving shaft 122, and the first engaging portions 110 and 116 and the second engaging portions 107 and 113 are moved from the cam grooves 102, 103, 104, and 105. Let go.

Then, the drum 101 is rotated by driving the drum drive unit 106, N ^× or N ^×× next to the second speed positions of the drum 101 to (Dogusuribu 91 neutral state does not engage with the dog 23). Next, the drive device 123 is driven to rotate the drive shaft 122 in the reverse direction, and the first engagement portions 110 and 116 and the second engagement portions 107 and 113 are engaged with the cam grooves 102, 103, 104, and 105. To do. Since the first engaging portions 110 and 116 and the second engaging portions 107 and 113 separated from the cam grooves 102, 103, 104, and 105 are in the neutral position, the cam grooves 102, 103, 104, and 105 are engaged with each other. You can be sure. Next, the drum driving device 106 is driven to slightly rotate the drum 101 to the second speed position, and the dog sleeve 91 and the dog 23 are engaged with each other. Thereafter, the second speed is realized by connecting the clutch 6.

  Here, in the transmission 1 to which the changing device 100 is not connected, when performing the skip shift from the 5th speed to the 2nd speed, the gear stage is sequentially changed from 5th speed → N → 4th speed → N → 3rd speed → N → 2nd speed. Thus, the dog sleeve 91 and the dog are engaged and disengaged many times. Since it takes time to engage and disengage the dog sleeve 91 and the dog due to the movement of the forks 109, 112, 115, 118, there is a problem that the response cannot be improved. Further, if a phenomenon occurs where the dogs and the dog sleeve 91 do not mesh with each other and the tips collide with each other, it may take more time for shifting.

  However, since the changing device 100 is connected to the transmission 1, the switching device 121 causes the first engaging portions 110 and 116 and the second engaging portions 107 and 113 to be connected to the cam grooves 102, 103, 104, and so on during a skip shift. 105 can be removed. Since the position of the drum 101 can be changed without the forks 109, 112, 115, 118 moving, the time required for the speed change operation can be shortened. Therefore, the response of the shift can be improved.

  Further, in the transmission 1 to which the changing device 100 is not connected, when N → 4th speed, N → 3rd speed, and N → 2nd speed, a phenomenon may occur in which the dog and the dog sleeve 91 do not mesh with each other and the leading ends abut against each other. There is sex. On the other hand, when the changing device 100 is connected to the transmission 1, the forks 109, 112, 115, 118 are not moved during the skip shift, so that the dogs and the dog sleeve 91 do not mesh with each other and the leading ends collide with each other. Only possible when N → 2nd. If a phenomenon occurs in which the dogs and the dog sleeve 91 do not mesh with each other and the leading ends abut against each other, it takes more time to shift gears. However, this possibility can be reduced by the changing device 100, so that the responsiveness of gear shifting can be further improved.

  By connecting the change device 100 to the transmission 1, not only the skip shift at the time of downshifting but also the skip shift at the time of upshifting can improve the responsiveness. In addition, since the first engaging portions 110 and 116 and the second engaging portions 107 and 113 can be separated from the cam grooves 102, 103, 104, and 105 by the switching device 121, the vehicle is running to improve the fuel efficiency of the automobile. When the power source 5 is stopped, it is possible to quickly switch to the gear stage when the power source 5 is restarted. Further, when the accelerator pedal (not shown) is released, the transmission 1 can be upshifted in a neutral state (power off upshift) by the switching device 121.

  According to the changing device 100, in the switching device 121, the drive shaft 122 is arranged outside the radial direction of the drum 101 along with the drum 101, and the drive device 123 rotates the drive shaft 122 about the axis. The first links 130 and 140 linked to the rotation of the drive shaft 122 cause the engagement between the cam grooves 103 and 105 and the first engagement portions 110 and 116 and the first engagement portions 110 and 116 from the cam grooves 103 and 105. Can be switched off. Since the drive shaft 122 is arranged side by side with the drum 101, the axial length of the changing device 100 can be reduced. Therefore, the transmission 1 and the entire change device 100 can be reduced in size.

  The first links 130, 140 are coupled to the drive shaft 122, and claw portions 137, 147 that protrude outward in the radial direction of the drive shaft 122 interfere with the first engagement portions 110, 116 to form the first engagement. The portions 110 and 116 abut against the surface of the drum 101 side. The boss portions 131 and 141 fix the first engaging portions 110 and 116 to the support shafts 111 and 117 so that the boss portions 131 and 141 cannot move in the axial direction of the support shafts 111 and 117 and can swing in the circumferential direction of the support shafts 111 and 117. Therefore, the engagement between the cam grooves 103 and 105 and the first engagement portions 110 and 116 and the engagement of the first engagement portions 110 and 116 from the cam grooves 103 and 105 by the claw portions 137 and 147 and the boss portions 131 and 141 are performed. You can quickly switch between leaving.

  In the first links 130 and 140, the springs 135 and 145 urge the boss portions 131 and 141 in the engaging direction in which the first engaging portions 110 and 116 engage with the cam grooves 103 and 105, and the claw portions 137, 147 applies a load to the springs 135 and 145 while interfering with the first engagement portions 110 and 116 and swinging the boss portions 131 and 141 in the disengagement direction opposite to the engagement direction. Since the first engaging portions 110 and 116 are engaged with the cam grooves 103 and 105 by the restoring force of the contracted springs 135 and 145, the first links 130 and 140 are compared with the case where the springs 135 and 145 are not used. The structure can be simplified.

  In the switching device 121, a linkage shaft 124 is arranged along with the drive shaft 122. The interposition part 150 interposed between the linkage shaft 124 and the drive shaft 122 transmits the rotation of the drive shaft 122 to the linkage shaft 124, and the second links 160 and 170 linked to the rotation of the linkage shaft 124 include the cam groove 102. , 104 and the second engaging portions 107, 113 are switched to the disengagement of the second engaging portions 107, 113 from the cam grooves 102, 104. Since the rotation of the drive shaft 122 by the drive device 123 can be transmitted to the linkage shaft 124 by the interposition part 150, a separate drive device for rotating the linkage shaft 124 can be eliminated. In addition, since the linkage shaft 124 is disposed side by side with the drive shaft 122, the axial length of the drum 101 can be shortened compared to the case where the drive shaft 122 is disposed outside the drive shaft 122 in the axial direction. Therefore, the changing device 100 can be reduced in size.

  The present invention has been described above based on the embodiments. However, the present invention is not limited to the above embodiments, and various improvements and modifications can be made without departing from the spirit of the present invention. It can be easily guessed. For example, the number of gear stages of the transmission 1 can be set as appropriate.

  Although the case where the transmission 1 is mounted on an automobile has been described in the above embodiment, the present invention is not limited to this, and it is naturally possible to mount the transmission 1 on a construction machine, an industrial vehicle, an agricultural machine, or the like. . Also in this case, the changing device 100 can improve the responsiveness of the shift.

  In the above embodiment, the case where the dog sleeve 91 is structured to be engaged with the dogs 13, 23, 33, 43, 53, 63, 73, 83 protruding in the axial direction has been described, but the present invention is not limited to this. It is not a thing. For example, a transmission having a structure in which a hole (engagement hole) that meshes with the dog teeth of the dog sleeve 91 is provided on the transmission gear side, a transmission having a synchronization device, and a transmission in which the dog teeth and the synchronization device are combined. Is of course possible.

  In the above embodiment, the case where the power transmission device is the transmission 1 of the cylindrical cam type sequential shift mechanism has been described. However, the power transmission device is not necessarily limited to this, and a transmission including a synchronization device and other power transmissions. It is of course possible to employ the device. As another power transmission device, for example, a mechanism (transfer) for distributing the output of the power source to the drive wheels can be mentioned. By connecting the change device 100 to the transfer, it is possible to improve responsiveness when changing the distribution of power to the drive wheels.

  In the above embodiment, the case where the changing device 100 includes the linkage shaft 124, the interposition part 150, the second engagement parts 107 and 113, and the second links 160 and 170 has been described. However, the number of gear stages is small. Of course, it is possible to omit the linkage shaft 124, the interposition part 150, the second engagement parts 107 and 113, and the second links 160 and 170.

  In the above embodiment, the switching device 121 has been described with respect to the case where the drive shaft 122 is rotated by the motor (drive device 123) to switch the engagement and disengagement between the cam grooves 103, 105 and the first engagement portions 110, 116. However, the present invention is not necessarily limited to this, and it is naturally possible to employ other driving devices. Other driving devices include solenoids, actuators using hydraulic pressure, pneumatic pressure, and the like. Further, the drive device is not limited to one that outputs a rotational motion, and it is naturally possible to employ a drive device that outputs a linear mobility. In that case, a link (switching device) for converting the linear motion output from the drive device into the motion of the first engaging portions 110 and 116 may be provided.

1 Transmission (power transmission device)
DESCRIPTION OF SYMBOLS 100 Change apparatus 101 Drum 102,103,104,105 Cam groove 106 Drum drive apparatus 107,113 2nd engaging part 109,115 Fork (2nd moving member)
110, 116 First engaging portion 111, 117 Support shaft 112, 118 Fork (first moving member)
121 switching device 122 driving shaft 123 driving device 124 linkage shaft 130, 140 first link 131, 141 boss portion 136, 147 spring 137, 147 claw portion 150 interposition portion 153, 154 protrusion (part of restriction portion)
157 Tip surface (part of the restriction)
160,170 Second link

Claims (6)

A changing device connected to a power transmission device disposed on a power transmission path between the power source and the drive wheel,
A drum having cam grooves formed on the outer peripheral surface;
A drum driving device for rotating the drum around its axis;
A first engaging portion that engages with the cam groove;
A first moving member that moves in the axial direction of the drum by the first engagement portion being guided by the cam groove and changes a power transmission path in the power transmission device;
A change device comprising: a switching device that switches between engagement of the cam groove and the first engagement portion and separation of the first engagement portion from the cam groove. The switching device includes a drive shaft that is arranged on the outer side in the radial direction of the drum alongside the drum,
A drive device for rotating the drive shaft about the axis;
A first link for switching between engagement of the cam groove and the first engagement portion and disengagement of the first engagement portion from the cam groove in association with rotation of the drive shaft; The changing device according to claim 1, characterized in that: An axially movable support shaft, which is arranged alongside the drive shaft and to which the first moving member is coupled,
The first link is coupled to the drive shaft and protrudes outward in the radial direction of the drive shaft, and a claw portion that interferes with the first engagement portion;
The boss portion that fixes the first engagement portion to the support shaft so as to be unmovable in the axial direction of the support shaft and swingable in the circumferential direction of the support shaft is provided. Change device. The first link includes a spring that urges the boss portion in an engagement direction in which the first engagement portion engages with the cam groove,
4. The change according to claim 3, wherein the claw portion applies a load to the spring while interfering with the first engagement portion and swinging the boss portion in a disengagement direction opposite to the engagement direction. apparatus. A second engagement portion that engages with the cam groove;
A second moving member that moves in the axial direction of the drum by the second engagement portion being guided by the cam groove and changes a power transmission path in the power transmission device;
The switching device includes a linkage shaft arranged side by side with the drive shaft,
An intermediate portion interposed between the linkage shaft and the drive shaft, which transmits the rotation of the drive shaft to the linkage shaft;
A second link for switching between engagement of the cam groove and the second engagement portion and disengagement of the second engagement portion from the cam groove in association with rotation of the linkage shaft by the interposition portion; The changing device according to claim 2, wherein   The change device according to claim 5, wherein the interposition part includes a restriction part that restricts rotation of the drive shaft and the linkage shaft by a predetermined amount or more.

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