JP6090357B2 - Transmission operating mechanism of transmission - Google Patents

Description

  The present invention relates to a speed change operation mechanism of a transmission mounted on a vehicle, and belongs to the field of vehicle power transmission technology.

  In general, a manual transmission for an automobile includes an engine-side shaft connected to an engine output shaft via a clutch, and a drive wheel arranged in parallel to the shaft and connected to a drive wheel via a differential. Side shaft. Between these shafts, a plurality of forward gear trains and usually one reverse gear train are provided. Then, one gear train is brought into a power transmission state via the speed change operation mechanism by the driver's operation of the change lever.

  A control rod may be provided in the shift operation mechanism of this type of manual transmission. In this case, the control rod moves in the axial direction and rotates in conjunction with the selection operation and shift operation of the change lever. Any one of the gear trains is in a power transmission state.

  Patent Document 1 discloses a speed change operation mechanism including a single control rod that extends vertically through a transmission case of a manual transmission. In this type of shift operation mechanism, a transmission outer case includes a select outer lever to which a select cable for transmitting a change operation of a change lever is connected, and a shift outer lever to which a shift cable for transmitting a shift operation of the change lever is connected. It may be arranged above.

  In this case, the select outer lever is swingably supported by a support shaft extending in the horizontal direction, connected to the change lever via the select cable on one end side, and engaged with the control rod on the other end side. The shift outer lever is fixed to the upper end of the control rod, and is connected to the change lever via a shift cable. When the change lever is selected, the control rod is moved up and down in the axial direction by the select outer lever that swings around the support shaft in conjunction with this, and when the change lever is operated in shift, the change lever is linked. As a result, the control rod rotates around its axis along with the shift outer lever.

  By the way, in the configuration in which the shift operation force of the change lever is transmitted to the control rod through the shift cable as in the transmission operation mechanism of Patent Document 1, the shift operation force is transmitted without interposing the cable. , Shift feeling tends to get worse.

  Therefore, the shift operation mechanism of Patent Document 1 is provided with a counterweight for improving the shift feeling. The counterweight includes a fitting support portion supported on the transmission case in a state of being fitted to the control rod so as to be rotatable and relatively movable in the axial direction near the lower side of the shift outer lever, and the fitting A pair of arm portions extending radially outward from the support portion and a weight portion provided at the tip of each arm portion are provided. Further, an engagement pin protruding upward from one arm portion is fixed to the counterweight, and the engagement pin is disposed so as to extend in parallel with the control rod, and is provided on the shift outer lever. It is inserted through the through hole.

  In the shift operation mechanism of Patent Document 1 configured as described above, when the control rod moves in the vertical direction in conjunction with the select operation, the shift outer lever also moves in the vertical direction together with the control rod. At this time, since the through hole of the shift outer lever moves along the engaging pin, the counterweight does not move up and down together with the control rod and the shift outer lever. For this reason, the weight of the counterweight is not applied during the selection operation for moving the control rod up and down, so that the deterioration of the selection feeling due to the provision of the counterweight is prevented.

  When the control rod rotates together with the shift outer lever around its axis in conjunction with the shift operation, the engagement pin is pushed and moved in the circumferential direction by the shift outer lever. Rotates around the axis of the control rod. By performing the shift-in using the inertia of the counterweight generated thereby, the shift operation force is reduced and a smooth shift-in is realized, and the shift feeling is improved.

JP 2012-067885 A

  In the shift operation mechanism of the above-mentioned Patent Document 1, the shift outer lever extends from the fitting portion fitted to the outside of the control rod and the fitting portion to the shift cable from the fitting portion toward the radially outer side. A lever main body, and an extension lever that extends radially outward from the fitting portion toward the opposite side of the lever main body, and an engagement pin of a counterweight is inserted into the distal end of the extension lever A through hole is provided.

  However, in the structure in which the extension lever portion is provided on the shift outer lever and the engagement pin of the counterweight is engaged with the distal end portion of the extension lever portion, the distal end portion of the extension lever portion is spaced away from the control rod in the radial direction. And the engagement pin are arranged, there is a problem that the entire speed change operation mechanism is enlarged in the radial direction.

  It should be noted that the extension lever part of the shift outer lever is shortened or a through hole is provided in the lever main body instead of removing the extension lever part, and the engagement pin of the counterweight is moved near the control rod. It is conceivable to reduce the radial direction by engaging with the through-holes in this case, but in this case, in order to ensure the strength of the shift outer lever, the through-hole for inserting the control rod in the shift outer lever Since it is necessary to provide the counterweight with a through hole for inserting the engagement pin in the radial direction, it is difficult to achieve sufficient compactness.

  Further, since the shift outer lever and the counterweight are usually disposed so as to be exposed above the transmission case, the inner peripheral portion of the counterweight fitting support portion fitted to the control rod, the counterweight It is conceivable to attach a cover member for preventing foreign matter such as muddy water and dust from biting into the inner peripheral portion of the through hole of the shift outer lever engaged with the engagement pin of the weight. In order to protect both inner peripheral portions spaced apart in the radial direction from foreign substances, the cover member is also increased in size.

  Therefore, the present invention includes a counterweight that improves the shift feeling by rotating in conjunction with the shift operation of the change lever via the shift cable. An object of the present invention is to make the entire speed change operation mechanism in the radial direction of the control rod compact in the speed change operation mechanism of the transmission.

  In order to solve the above-described problems, the transmission operating mechanism of the transmission according to the present invention is configured as follows.

First, the invention according to claim 1 of the present application is
A control rod that moves in the axial direction in conjunction with the select operation of the change lever and rotates in conjunction with the shift operation, and does not follow the movement in the axial direction of the control rod at the time of the select operation. A transmission operation mechanism of a transmission comprising a counterweight engaged with the control rod so as to rotate in conjunction with the rotation of the control rod;
The counterweight includes a sleeve portion fitted outside the control rod,
The sleeve portion is provided with a groove portion extending in the axial direction,
The groove is engaged with a protrusion that protrudes radially outward from the outer peripheral surface of the control rod.

According to a second aspect of the present invention, there is provided a transmission operation mechanism for a transmission according to the second aspect of the present invention.
The counterweight is disposed above the transmission case,
A cover member that covers the groove from the outside is disposed on the transmission case.

Furthermore, the speed change operation mechanism of the transmission according to the invention of claim 3 is the invention according to claim 1,
A first lever portion connected to the change lever via a select cable and a second lever portion connected to the change lever via a shift cable are disposed on one end side of the control rod,
The counter weight and the protrusion are disposed on the other end side of the control rod.

  According to the invention described in claim 1 of the present application, when the control rod moves in the axial direction in conjunction with the select operation, the protruding portion protruding radially outward from the outer peripheral surface of the control rod is located outside the control rod. By moving along the groove portion of the sleeve portion of the fitted counterweight, the counterweight is prevented from being moved up and down, and when the projection portion rotates together with the control rod, the projection When the sleeve portion is pushed in the circumferential direction by the portion, the counterweight is rotated around the axis of the control rod, and the shift weight is improved by the inertia of the counterweight generated thereby.

  Thus, the engagement mechanism that engages the counter weight with the control rod so as to restrict movement during the select operation and to rotate during the shift operation is constituted by the sleeve portion of the counter weight and the protruding portion of the control rod. Since both the sleeve part and the projecting part can be compactly arranged around the control rod, compared with the conventional configuration in which engagement is performed using a member arranged radially away from the control rod. Thus, the entire engaging mechanism can be configured to be compact in the radial direction.

  Furthermore, when providing a protective structure for preventing foreign matter such as muddy water and dust from biting into the groove portion of the sleeve portion, the protective structure can also be configured to be compact in the radial direction around the sleeve portion. . Therefore, it is possible to effectively realize the downsizing of the entire speed change operation mechanism.

  According to the second aspect of the present invention, since the groove portion of the sleeve portion is covered from the outside by the cover member disposed on the transmission case, clogging and freezing of foreign matters in the groove portion are suppressed. For this reason, the protruding portion of the control rod can move in the axial direction along the groove portion of the sleeve portion without hindrance, so that deterioration of the select operability can be suppressed.

  According to the third aspect of the present invention, the first and second lever portions connected to the select cable and the shift cable are disposed on one end side of the control rod, and the counter weight is disposed on the other end side of the control rod. Since the protrusion of the control rod and the protrusion of the control rod are arranged, it is possible to easily avoid the counterweight and the protrusion of the control rod from interfering with the select cable and the shift cable. Therefore, it is possible to improve the layout and shape flexibility of the protruding portions of the counterweight and the control rod. In addition, it is possible to suppress the shortening of the arm portion of the counterweight in order to avoid interference with peripheral parts, so that the shortening of the turning radius is canceled to obtain a required moment of inertia when the counterweight is turned. Thus, an increase in the weight of the counterweight can be suppressed. Thereby, weight reduction of a counterweight can be achieved, and it can contribute to the improvement of the fuel consumption performance of a vehicle.

It is sectional drawing which looked at the speed change operation mechanism of the transmission which concerns on 1st Embodiment of this invention from the side. It is the side view which looked at the engaging part of a control rod and a counterweight from the direction different from FIG. It is a perspective view which shows a cover member. It is sectional drawing which looked at the speed change operation mechanism of the transmission which concerns on 2nd Embodiment from the side.

  Hereinafter, embodiments of the present invention will be described.

[First Embodiment]
FIG. 1 is a cross-sectional view of the speed change operation mechanism 30 according to the first embodiment as viewed from the side. The shift operation mechanism 30 is provided, for example, in a horizontal manual transmission that is mounted on a front-wheel drive vehicle.

  As the speed change operation mechanism 30, for example, a cassette type attached to the transmission case 20 in an assembled state is used. The speed change operation mechanism 30 is connected to a change lever (not shown) via a select cable (not shown) and a shift cable (not shown), and operates in conjunction with the operation of the change lever. ing.

  The speed change operation mechanism 30 includes a control rod 32 that passes through the upper surface portion 21 of the transmission case 20 and extends in the vertical direction. With the configuration described later, the control rod 32 moves in the axial direction (in the direction of arrow D1) in conjunction with the select operation of the change lever, and rotates in the direction of arrow D2 around the axis in conjunction with the shift operation.

  The speed change operation mechanism 30 further includes, for example, a disk-shaped base member 31. The base member 31 is disposed so as to close the opening 22 provided in the upper surface portion 21 of the transmission case 20 from above, and is fixed to the peripheral edge portion of the opening 22 in the upper surface portion 21 by, for example, a bolt.

  A cylindrical portion 31a extending in the vertical direction is provided at the central portion of the base member 31, and a control rod 32 is inserted into the cylindrical portion 31a. The control rod 32 is fitted to the inside of the cylindrical portion 31a via a bearing member 44 so as to be freely movable in the axial direction and rotatable. As the bearing member 44, for example, a metal bush whose inner peripheral surface is coated with a fluororesin or the like is used, thereby reducing the sliding resistance and rotational resistance of the control rod 32 with respect to the inner peripheral surface of the bearing member 44. Has been.

  In addition, a cylindrical seal member 45 made of rubber, for example, is interposed between the outer peripheral surface of the control rod 32 and the inner peripheral surface of the cylindrical portion 31a at a portion adjacent to the upper side of the bearing member 44. This prevents the oil in the transmission case 20 from leaking outside through the cylindrical portion 31a.

  The lower end side of the control rod 32 penetrates the horizontal plane part 23 provided in the transmission case 20, and the lower end part of the control rod 32 protrudes below the horizontal plane part 23. The control rod 32 is fitted inside the through hole 24 provided in the horizontal plane portion 23 via a bearing member 46 so as to be freely movable in the axial direction and rotatable. As the bearing member 46, for example, a metal bush whose inner peripheral surface is coated with a fluororesin or the like is used, thereby reducing the sliding resistance and rotational resistance of the control rod 32 with respect to the inner peripheral surface of the bearing member 46. Has been.

  Further, the speed change operation mechanism 30 rotates the control rod 32 about the axis center in conjunction with the select outer lever 34 that moves the control rod 32 in the axial direction in conjunction with the change lever select operation and the shift lever shift operation. A shift outer lever 40 to be moved and a counterweight 70 that improves the shift feeling by rotating in conjunction with the rotation of the control rod 32 during a shift operation are provided.

  The select outer lever 34, the shift outer lever 40, and the counterweight 70 are disposed above the upper surface portion 21 of the transmission case 20.

  The select outer lever 34 is supported by a support shaft 38 extending in the horizontal direction so as to be rotatable around the axis of the support shaft 38. The support shaft 38 is supported by the base member 31 via a support portion 39 protruding upward from the base member 31.

  The select outer lever 34 includes an operation lever portion 35 and a drive lever portion 36 that extend in different directions from the portion supported by the support shaft 38. A cable pin 37 to which the select cable is connected is provided at the distal end portion of the operation lever portion 35. The cable pin 37 is disposed so as to extend in parallel to the support shaft 38. For example, a disc-shaped engaged portion 36 a that is engaged with the control rod 32 is provided at the distal end portion of the drive lever portion 36. The engaged portion 36 a is engaged with a groove portion 32 a provided so as to extend horizontally in the vicinity of the upper end of the control rod 32.

  The upper end of the control rod 32 is covered with, for example, a resin cap 42 for protecting the engaging portion between the groove 32 a and the select outer lever 34, and the groove 42 a is covered with the cap 42. Thus, the foreign matter is prevented from being caught in the engaging portion between the groove portion 32a and the select outer lever 34.

  Since the select outer lever 34 is engaged with the control rod 32 as described above, when the select outer lever 34 rotates around the axis of the support shaft 38 in conjunction with the selection operation of the change lever, it moves up and down. The control rod 32 is axially moved up and down by being pushed upward or downward by the engaged portion 36a of the select outer lever 34 swinging in the vertical direction.

  The shift outer lever 40 is disposed so as to extend in the horizontal direction, and is fixed to the lower vicinity of the groove 32a of the control rod 32 by, for example, welding at one end thereof. A cable pin 41 to which the shift cable is connected is fixed to the other end of the shift outer lever 40 by welding, for example. The cable pin 41 protrudes upward from the shift outer lever 40 and is disposed so as to extend in a direction parallel to the control rod 32.

  When the change lever is shifted, the shift outer lever 40 rotates about the axis of the control rod 32 together with the control rod 32.

  A sleeve member 50 is fitted to a portion of the control rod 32 located in the transmission case 20. The sleeve member 50 is fixed to the control rod 32 by a pin 51 that penetrates the sleeve member 50 and the control rod 32 in the radial direction, whereby the sleeve member 50 moves and rotates in the axial direction together with the control rod 32. It is supposed to be.

  The sleeve member 50 is provided with a shift finger 52 that extends radially outward from the outer peripheral surface of the sleeve member 50.

  When the control rod 32 moves up and down in the axial direction in conjunction with the selection operation at the forward stage by the change lever, the shift finger 52 moves up and down together with the control rod 32, and the control rod 32 moves in the transmission case 20. Of a plurality of gate members (not shown) arranged in the vicinity in the vertical direction, the gate member is engaged with the gate member corresponding to the select position selected by the select operation.

  When the shift operation is further performed in this state, the shift finger 52 is rotated together with the control rod 32 to correspond to the gear stage selected by the shift operation via the gate member engaged with the shift finger 52. A synchronizer (not shown) is activated, thereby realizing a power transmission state at the forward gear.

  When the select operation to the reverse stage is performed by the change lever, the shift finger 52 that has moved in the axial direction together with the control rod 32 is engaged with the reverse gate member. By rotating the shift finger 52 together with the control rod 32, for example, a selective sliding mechanism (not shown) is operated via the reverse gate member, thereby realizing a power transmission state in the reverse stage. The

  A part of the outer peripheral surface of the sleeve member 50 is a cam surface 54, and a pressing member 60 fixed to the base member 31 is pressed to the cam surface 54 via a bracket 62. The pressing member 60 incorporates an elastic member, and the elastic force of the elastic member is applied to the cam surface 54.

  The cam surface 54 is provided with three concave portions in parallel with the circumferential direction in which the pressing member 60 is selectively engaged according to the position in the shift direction (one shift completion position, neutral position, and the other shift completion position). In addition, each recess is formed in a groove shape extending in the vertical direction, and the bottom of each recess has a slope that becomes shallower upward from the deepest portion that contacts the pressing member 60 in the neutral state in the select direction, and A slope is formed so as to become shallower from the deepest portion downward. As a result, the cam surface 54 and the pressing member 60 generate a force for generating a force to return the control rod 32 axially moved upward or downward by the select operation to the neutral position, and the control rod 32 in the shift direction. And a detent function for positioning at a predetermined position.

  The bracket 62 is integrally provided with a guide plate 64 disposed so as to be opposed to the outer peripheral surface of the sleeve member 50, and guide holes (not shown) formed in the guide plate 64 corresponding to the shift pattern. ), A guide pin (not shown) projecting from the outer peripheral surface of the sleeve member 50 is inserted therethrough. Thus, the guide function of guiding the guide pins along the guide holes of the guide plate 64 is performed during the selection operation and the shift operation.

  Further, an interlock regulating member 56 is attached to the control rod 32. The interlock restricting member 56 has, for example, a C-shape when viewed from the side so as to sandwich the sleeve member 50 from both sides in the axial direction, and thereby follows the axial movement of the sleeve member 50 during the selection operation. Moved.

  The interlock regulating member 56 is rotatably fitted to the outside of the control rod 32. The interlock regulating member 56 is provided with a notch 56a for avoiding interference with the pressing member 60, and the pressing member 60 is sandwiched from both sides in the circumferential direction by the peripheral edge of the notch 56a. ing. Thereby, when the control rod 32 rotates in conjunction with the shift operation, the rotation of the interlock restricting member 56 is restricted by the pressing member 60.

  The interlock restricting member 56 includes an upper claw portion 57 disposed adjacent to the upper side of the shift finger 52 and a lower claw portion 58 disposed adjacent to the lower side of the shift finger 52. When the shift finger 52 is engaged with the gate member selected by the selection operation, all the remaining gate members except the gate member are engaged with either the upper or lower claw portions 57 and 58. The Therefore, during the shift operation, the operation of the gate members other than the gate member engaged with the shift finger 52 is regulated by the claw portions 57 and 58 of the interlock regulating member 56, thereby avoiding the interlock of the transmission mechanism. .

  The counterweight 70 includes a sleeve portion 71 fitted to the outside of the control rod 32, an arm portion 72 extending radially outward from the sleeve portion 71, and a weight portion 73 provided at the tip of the arm portion 72. I have.

  The sleeve portion 71 is disposed below the shift outer lever 40 and is supported on the base member 31.

  The arm portion 72 is an elongated plate-like portion, and is supported by the base member 31 via the sleeve portion 71. The arm portion 72 extends radially outward from a lower portion than the central portion of the sleeve portion 71, and is disposed, for example, along the horizontal direction above the base member 31 and the upper surface portion 21 of the transmission case 20. Has been. The arm portion 72 may be provided integrally with the sleeve portion 71 and the weight portion 73, or may be joined by welding, for example.

  The weight part 73 has a larger weight, circumferential dimension, and vertical dimension than the sleeve part 71 and the arm part 72, and the tip of the arm part 72 is connected to the lower end part of the weight part 73. The weight portion 73 is supported by the base member 31 via the arm portion 72 and the sleeve portion 71.

  The counterweight 70 is engaged with the control rod 32 via the engagement mechanism 75. The engagement mechanism 75 includes a groove portion 76 provided in the sleeve portion 71 so as to extend in the axial direction, and an engagement pin 78 as a protrusion portion protruding radially outward from the outer peripheral surface of the control rod 32. The engaging pin 78 is engaged with the groove 76.

  As shown in FIG. 2, the groove portion 76 is configured by a slit-shaped notch provided in a part of the sleeve portion 71 in the circumferential direction. The groove width of the groove portion 76 is preferably slightly larger than the diameter of the engagement pin 78, whereby the sliding resistance of the engagement pin 78 with respect to the side wall of the groove portion 76 is reduced. The groove 76 is formed to extend downward from the upper end of the sleeve 71. The lower end side of the groove portion 76 is closed, and thereby the deformation of the sleeve portion 71 that suppresses the groove width of the groove portion 76 is suppressed.

  However, the groove portion 76 may be formed from the upper end to the lower end of the sleeve portion 71 so that the sleeve portion 71 has a C-shape when viewed in the axial direction.

  The engagement pin 78 is fixed to the control rod 32 by, for example, being press-fitted into a mounting hole (not shown) provided in the control rod 32 so as to extend in the radial direction. Since the engagement pin 78 is fixed to the control rod 32, the engagement pin 78 can move and rotate in the axial direction together with the control rod 32. However, the method of fixing the engagement pin 78 to the control rod 32 is not particularly limited, and may be fixed by welding, for example.

  The engagement pin 78 has, for example, a round bar shape, and can be brought into line contact with the side wall of the groove portion 76 of the sleeve portion 71. As shown in FIG. 1, the engagement pin 78 is disposed so as to slightly protrude outward in the radial direction from the outer peripheral surface of the sleeve portion 71. The surface of the engagement pin 78 is preferably subjected to a heat treatment such as carburization, whereby the wear resistance of the engagement pin 78 is improved. Moreover, in order to improve rust prevention property, it is preferable to perform the plating process on the surface of the engagement pin 78. The diameter of the engagement pin 78 is, for example, not less than 0.2 times and not more than 0.5 times the diameter of the control rod 32.

  The counter weight 70 is engaged with the control rod 32 via the engagement mechanism 75 configured as described above, so that relative movement in the axial direction of the control rod 32 with respect to the counter weight 70 is allowed during the selection operation. During the shift operation, the counterweight 70 rotates in conjunction with the rotation of the control rod 32.

  Specifically, when the engagement pin 78 moves in the vertical direction together with the control rod 32 in conjunction with the selection operation of the change lever, the engagement pin 78 moves along the groove portion 76 of the sleeve portion 71 of the counterweight 70. At this time, the counterweight 70 is not moved by the engaging pin 78 because it moves. Therefore, when the control rod 32 is moved up and down by the selection operation, the weight of the counterweight 70 is not applied, and a good selection operability is obtained.

  In the select neutral state, the engagement pin 78 is engaged with the central portion in the length direction of the groove portion 76 or in the vicinity thereof, and the length of the groove portion 76 is moved in the axial direction together with the control rod 32 by the select operation. The length is such that the engaging pin 78 does not come off the groove 76.

  When the control rod 32 rotates together with the shift outer lever 40 in conjunction with the shift lever shift operation, the engagement pin 78 that rotates together with the control rod 32 causes the side wall of the groove portion 76 in the sleeve portion 71 of the counterweight 70. Is pushed in the circumferential direction, the counterweight 70 rotates around the control rod 32, and the shift feeling is improved by the inertia of the counterweight 70 generated thereby.

  The groove portion 76 of the engagement mechanism 75 is covered from the outside by a cover member 80 disposed on the transmission case 20, whereby the biting of foreign matters such as muddy water and dust is suppressed.

  As shown in FIGS. 1 and 3, the cover member 80 includes a fixed surface portion 82 fixed to the base member 31 at a position adjacent to the sleeve portion 71 of the counterweight 70 in the radial direction, and the sleeve portion 71 side of the fixed surface portion 82. A rising surface portion 84 that rises upward from the edge of the upper surface portion, and an upper surface portion 86 that extends horizontally from the upper end of the rising surface portion 84 toward the sleeve portion 71.

  For example, a pair of bolt insertion holes 83 are provided in the fixed surface portion 82 and are fixed to the base member 31 by bolts 88 inserted into the bolt insertion holes 83 from above.

  The rising surface portion 84 is disposed slightly inclined inward in the radial direction toward the upper side. Further, the rising surface portion 84 is disposed so as to oppose the engaging pin 78 and the groove portion 76 in the radially outer vicinity in the shift neutral state. The rising surface portion 84 is, for example, a rectangular plate-like portion, and the horizontal width of the rising surface portion 84 is larger than the diameter of the sleeve portion 71. Further, the upper end of the rising surface portion 84 is disposed slightly higher than the upper end of the sleeve portion 71.

  The upper surface portion 86 includes a circular portion 86 a disposed above the upper end surface of the sleeve portion 71, and a pair of connecting portions 86 b that connect the outer edge portion of the circular portion 86 a and the upper end of the rising surface portion 48. The circular portion 86 a has a larger diameter than the diameter of the sleeve portion 71.

  A through hole 87 is provided in the upper surface portion 86, and the control rod 32 is inserted into the through hole 87. The through hole 87 is slightly larger in diameter than the diameter of the control rod 32, and the sliding resistance and rotational resistance of the control rod 32 with respect to the inner peripheral surface of the through hole 87 are reduced.

  For example, a metal such as iron is used as the material of the cover member 80, but a resin may be used. When the resin cover member 80 is used, it is preferable that an iron spacer for preventing loosening is interposed between the inner peripheral surface of the bolt insertion hole 83 and the outer peripheral surface of the bolt 88.

  Since the cover member 80 configured in this way is attached to the base member 31, the groove portion 76 of the sleeve portion 71 of the counterweight 70 is raised from above by the upper surface portion 86 of the cover member 80. 84 are covered from the outside in the radial direction. Therefore, it is possible to effectively prevent foreign matters such as muddy water and dust from being caught between the groove 76 and the engagement pin 78. Therefore, since the clogging and freezing of foreign matters between the groove portion 76 and the engagement pin 78 are suppressed, the engagement pin 78 can move in the axial direction along the groove portion 76 without any trouble, so that the select operability is deteriorated. Can be suppressed.

  The speed change operation mechanism 30 described above has the following features and effects.

  First, the engaging mechanism 75 for engaging the counterweight 70 with the control rod 32 is constituted by the sleeve portion 71 of the counterweight 70 and the engaging pin 78 of the control rod 32 as described above, and these sleeve portions. Since both 71 and the engagement pin 78 are compactly arranged around the control rod 32, the engagement is performed by using a member that is spaced apart from the control rod in the radial direction as in the prior art. In comparison, the engagement mechanism 75 can be configured to be compact in the radial direction as a whole.

  In addition, since the engagement mechanism 75 is formed compactly, the cover member 80 for preventing the foreign matter from being caught between the groove 76 and the engagement pin 78 is also provided on the control rod 32 as described above. Since it is compactly disposed around the periphery, the entire shift operation mechanism 30 can be effectively made compact.

  Furthermore, since the sleeve portion 71 of the counterweight 70 is engaged with the control rod 32 only at one place in the circumferential direction, it is possible to select the control rod 32 and the sleeve portion 71 at the time of the selection operation as compared with the configuration in which the control rod 32 and the sleeve portion 71 are spline-fitted. The sliding resistance between the control rod 32 and the sleeve portion 71 can be reduced.

  Furthermore, in this embodiment, the engagement pin 78 is sandwiched between the parallel side walls of the groove portion 76, and the upper and lower sides of the engagement pin 78 are open. Compared with an engagement structure in which the entire outer periphery of the engagement pin 78 is surrounded by the inner peripheral surface of the hole, an effect that foreign matter is less likely to be clogged around the engagement pin 78 is obtained.

[Second Embodiment]
Next, the speed change operation mechanism 130 according to the second embodiment will be described with reference to FIG.

  FIG. 4 is a cross-sectional view of the manual transmission provided with the speed change operation mechanism 130 according to the second embodiment when viewed from the vehicle body width direction. In addition, about the component similar to 1st Embodiment, while attaching | subjecting the same code | symbol in FIG. 4, the description is abbreviate | omitted.

  As shown in FIG. 4, in the transmission case 20, a transmission mechanism 2 having a primary shaft 3, a secondary shaft 4 and a reverse shaft 5 respectively extending in the vehicle body width direction, and the output of the transmission mechanism 2 as drive wheels (see FIG. 4). (Not shown) and a differential 10 that transmits to the side are accommodated. The transmission mechanism 2 is disposed on the vehicle body rear side of the control rod 32, and the differential device 10 is disposed on the vehicle body rear side of the transmission mechanism 2.

  The primary shaft 3, the secondary shaft 4 and the reverse shaft 5 are disposed on the front side of the vehicle body and higher than the drive shaft 12 connected to the drive wheels. The secondary shaft 4 is disposed at a lower position on the rear side of the vehicle body than the primary shaft 3, and the reverse shaft 5 is disposed at a lower position on the front side of the vehicle body than the primary shaft 3. Yes.

  Between the primary shaft 3 and the secondary shaft 4, a plurality of forward gear stages and one reverse gear train are provided, and the shift operation mechanism 130 is operated by operating the driver's change lever. Thus, one gear train is brought into a power transmission state.

  Each gear train for the forward shift stage includes a drive gear 6 provided on the primary shaft 3 and a driven gear 7 provided on the secondary shaft 4, and the drive gear 6 and the driven gear 7 are always meshed. One of these gears 6 and 7 is a fixed gear fixed to the shafts 3 and 4, and the other is an idle gear that is loosely fitted to the shafts 3 and 4. By being fixed to the shafts 3 and 4 by a synchronizer (not shown), the forward gear stage is in a power transmission state.

  The reverse gear train includes a primary gear 8 a fixed to the primary shaft 3, a secondary gear 8 b fixed to the secondary shaft 4, and a reverse idle gear 8 c slidably provided on the reverse shaft 5. . The primary gear 8a and the secondary gear 8b do not mesh directly, but can mesh indirectly via the reverse idle gear 8c.

  The reverse idle gear 8c is arranged so as to be shifted in the axial direction from the primary gear 8a and the secondary gear 8b in the forward shift stage state and the neutral state. The idle gear 8c slides and meshes with the primary gear 8a and the secondary gear 8b. Thus, the primary gear 8a and the secondary gear 8b mesh with each other via the reverse idle gear 8c, so that the reverse gear train is in a power transmission state.

  An output gear 9 of the speed change mechanism 2 is fixed on the secondary shaft 4, and the output gear 9 is always meshed with the diff ring gear 11 of the differential device 10. The differential ring gear 11 has a larger diameter than the output gear 9, whereby the output of the speed change mechanism 2 is decelerated between the output gear 9 and the differential ring gear 11 and transmitted to the differential device 10. Power is transmitted from the moving device 10 to the left and right drive shafts 12 so as to have a rotational difference corresponding to the traveling state.

  The diff ring gear 11 is disposed so as to protrude below the lower surface portion 123 of the transmission case 20 that accommodates the transmission mechanism 2, and the transmission case 20 includes the lower surface portion 123 of the portion that accommodates the transmission mechanism 2. The lower surface portion 126 of the portion that accommodates the differential device 10 is configured to be lower than the lower portion.

  Due to the shape of the transmission case 20, a space is formed below the lower surface portion 123 of the portion of the transmission case 20 that houses the transmission mechanism 2 and on the vehicle body front side of the differential device 10. In the embodiment, a storage chamber 190 for storing the counterweight 170 of the speed change operation mechanism 130 is provided in the space.

  The transmission case 20 is provided with a peripheral wall 125 projecting downward from the lower surface portion 123, and a space surrounded by the peripheral wall 125 serves as a storage chamber 190. The lower end of the peripheral wall 125 is disposed at substantially the same height as the lower end of the lower surface portion 126 of the portion that houses the differential device 10. A lid member 127 that closes the storage chamber 190 from below is fixed to the lower end surface of the peripheral wall 125 with, for example, a bolt. The lid member 127 is provided with a communication hole 129 for allowing the storage chamber 190 to communicate with the external space, thereby reducing pressure fluctuations in the storage chamber 190 and intruding from water generated by condensation or from the outside. The water thus discharged can be discharged to the outside of the storage chamber 190 through the communication hole 129.

  Hereinafter, the configuration of the speed change operation mechanism 130 according to the second embodiment will be described.

  Configurations other than the configuration of the lower end portion of the control rod 32 and its peripheral portion in the speed change operation mechanism 130 and the configuration of the counterweight 170 and the engagement mechanism 175 are the same as those of the speed change operation mechanism 30 according to the first embodiment. The same operation as that of the first embodiment is performed during the selection operation and the shift operation.

  In the second embodiment, the lower end side of the control rod 32 passes through the lower surface portion 123 of the transmission case 20, and the lower end portion of the control rod 32 is disposed in the accommodation chamber 190. The transmission case 20 is provided with a through hole 124 that penetrates the lower surface portion 123 in the vertical direction, and the control rod 32 is inserted into the through hole 124.

  The control rod 32 is fitted inside the through hole 124 so as to be axially movable and rotatable via a bearing member 146. As the bearing member 146, for example, a metal bush whose inner peripheral surface is coated with a fluororesin or the like is used, thereby reducing the sliding resistance and rotational resistance of the control rod 32 with respect to the inner peripheral surface of the bearing member 146. Has been.

  Further, between the outer peripheral surface of the control rod 32 and the inner peripheral surface of the through hole 124, a cylindrical seal member 147 made of, for example, rubber is interposed in a portion adjacent to the lower side of the bearing member 146, Thereby, the oil in the transmission case 20 is prevented from leaking through the through hole 124 to the accommodation chamber 190 side.

  The counterweight 170 is disposed below the lower surface portion 123 of the transmission case 20 and is accommodated in the accommodation chamber 190. The counterweight 170 includes a sleeve portion 171 fitted to the outside of the lower end portion of the control rod 32, an arm portion 172 extending radially outward from the sleeve portion 171, and a weight portion provided at the tip of the arm portion 172. 173.

  The lower end portion of the sleeve portion 171 is fitted into a concave portion 127a provided on the upper surface of the lid member 127 via a low friction bush 182 made of, for example, resin. The bushing 182 is interposed between the lid member 127 and the sleeve portion 171, thereby reducing rotational resistance and preventing seizure.

  Note that the bush 182 may be interposed between the lid member 127 and the sleeve portion 171 without being fixed to either the lid member 127 or the sleeve portion 171. It may be fixed to one of these.

  The arm portion 172 is an elongated plate-like portion, and extends from the sleeve portion 171 toward the rear side of the vehicle body, for example. The arm portion 172 is disposed above the lid member 127, for example, along the horizontal direction. In addition, the arm part 172 may be integrally provided with respect to the sleeve part 171 and the weight part 173, respectively, for example, may be joined by welding.

  The weight part 173 has a larger weight, a circumferential dimension, and a vertical dimension than the sleeve part 171 and the arm part 172. The weight portion 173 is supported by the lid member 127 via the arm portion 172 and the sleeve portion 171.

  The counterweight 170 is engaged with the control rod 32 via the engagement mechanism 175. As in the first embodiment, the engaging mechanism 175 is a groove 176 provided in the sleeve portion 171 so as to extend in the axial direction, and a protruding portion that protrudes radially outward from the outer peripheral surface in the vicinity of the lower end of the control rod 32. The engaging pin 178 is engaged with the groove portion 176.

  The groove portion 176 is configured by a slit-shaped notch provided in a part of the sleeve portion 171 in the circumferential direction. The groove 176 is disposed on the front side of the vehicle body of the control rod 32, for example. The groove width of the groove portion 176 is preferably slightly larger than the diameter of the engagement pin 178, thereby reducing the sliding resistance of the engagement pin 178 with respect to the side wall of the groove portion 176. The groove 176 is formed so as to extend downward from the upper end of the sleeve 171. The lower end side of the groove portion 176 is closed, and thereby the deformation of the sleeve portion 171 that suppresses the groove width of the groove portion 176 is suppressed.

  However, the groove portion 176 may be formed from the upper end to the lower end of the sleeve portion 171 so that the sleeve portion 171 has a C shape when viewed in the axial direction.

  The engagement pin 178 is fixed to the control rod 32 by, for example, being press-fitted into a mounting hole (not shown) provided in the control rod 32 so as to extend in the radial direction. Since the engaging pin 178 is fixed to the control rod 32, it can move in the axial direction and rotate together with the control rod 32. However, the method of fixing the engagement pin 178 to the control rod 32 is not particularly limited, and may be fixed by welding, for example.

  The engagement pin 178 has, for example, a round bar shape, and can come into line contact with the side wall of the groove portion 176 of the sleeve portion 171. The engaging pin 178 is disposed so as to slightly protrude outward in the radial direction from the outer peripheral surface of the sleeve portion 171. The surface of the engagement pin 178 is preferably subjected to a heat treatment such as carburization, whereby the wear resistance of the engagement pin 178 is improved. Moreover, in order to improve rust prevention property, it is preferable to perform a plating process on the surface of the engagement pin 178. The diameter of the engagement pin 178 is, for example, not less than 0.2 times and not more than 0.5 times the diameter of the control rod 32.

  The counterweight 170 is engaged with the control rod 32 via the engaging mechanism 175 configured as described above, so that, in the same manner as in the first embodiment, the axial direction of the control rod 32 with respect to the counterweight 170 during the selection operation. By allowing the relative movement of the counter weight 170, the weight of the counter weight 170 is not applied, and a good selectability can be obtained. At the time of a shift operation, the counter weight 170 rotates in conjunction with the rotation of the control rod 32. The shift feeling is improved by the inertia of the counterweight 170 generated by the movement.

  Parts other than the counterweight 170 and the engagement pin 178 in the speed change operation mechanism 130 are assembled to the transmission case 20 from above in a state where they are assembled in advance as a subassembly. Thereafter, the engagement pin 178 is driven and fixed to a predetermined portion of the control rod 32 protruding downward from the lower surface portion 123 of the transmission case 20 through the service hole 125a provided in the peripheral wall 125. The service hole 125a is closed when the cap 192 is fitted after the engagement pin 178 has been driven.

  Subsequently, while inserting the sleeve portion 171 of the counterweight 170 from the lower side into the lower end portion of the control rod 32, the engagement pin 178 is fitted into the groove portion 176 of the sleeve portion 171, whereby the counterweight 170 is attached to the control rod 32. Is accommodated in the accommodation chamber 190 in a state of being engaged with the lower end of the housing.

  Thereafter, the cover member 127 is attached to the lower end surface of the peripheral wall 125 so that the bush 182 is interposed between the sleeve portion 171 and the recess 127a of the cover member 127, whereby the assembly of the speed change operation mechanism 130 is completed.

  According to the second embodiment, similarly to the first embodiment, the sleeve portion 171 of the counterweight 170 and the engagement pin 178 of the control rod 32 constituting the engagement mechanism 175 are both compact around the control rod 32. Therefore, the engagement mechanism 175 is configured to be compact in the radial direction as a whole compared to a configuration in which engagement is performed using a member that is spaced apart from the control rod in the radial direction as in the past. can do.

  Further, since the sleeve portion 171 of the counterweight 170 is engaged with the control rod 32 only at one place in the circumferential direction, compared to the configuration in which the control rod 32 and the sleeve portion 171 are spline-fitted, a selection operation is performed. The sliding resistance between the control rod 32 and the sleeve portion 171 can be reduced.

  Furthermore, since the upper and lower sides of the engaging pin 178 are opened by the engaging structure in which the engaging pin 178 is sandwiched between the side walls parallel to each other in the groove portion 176, the entire outer periphery of the engaging pin 178 is assumed to be a hole. As compared with the engagement structure that is surrounded by the inner peripheral surface, an effect that foreign matter is hardly clogged around the engagement pin 178 can be obtained.

  In the second embodiment, the counterweight 170 and the engagement mechanism 175 are accommodated in the accommodation chamber 190, so that the groove 176 of the sleeve portion 171 and the engagement pin 78, or the inner peripheral surface of the sleeve portion 171. And foreign matter such as muddy water and dust can be prevented from getting caught between the outer periphery of the control rod 32 and the control rod 32 and the counterweight 170 due to clogging or freezing. Thereby, deterioration of select operability and shift operability is suppressed.

  Furthermore, in the second embodiment, since the counter weight 170 is disposed on the lower end side of the control rod 32, it is not necessary to secure an engaging portion with the counter weight 170 on the upper end side of the control rod 32. The amount of protrusion of the control rod 32 from the upper surface portion 21 of the transmission case 20 can be reduced.

  Further, since the counterweight 170 is disposed on the lower end side of the control rod 32, the select outer lever 34, the shift outer lever 40, which are disposed on the upper end side of the control rod 32, that is, above the transmission case 20, Interference with the select cable and shift cable, and interference with peripheral components such as mount members and various harnesses can be easily avoided.

  Therefore, the layout and shape flexibility of the counterweight 170 can be improved. Further, by this, the shortening of the arm portion 172 of the counterweight 170 is suppressed, so that it is possible to reduce the weight of the counterweight 170 while ensuring a required moment of inertia, which contributes to an improvement in the fuel consumption performance of the vehicle. be able to.

  In addition, the counterweight 170 is disposed using a dead space below the transmission mechanism 2 and below the transmission case 20 generated on the front side of the vehicle body of the differential device 10. It is possible to suppress an increase in the directional dimension, a change in the structure within the transmission case 20, and a change in the layout of peripheral components of the transmission case 20.

  While the present invention has been described with reference to the above-described embodiments, the present invention is not limited to the above-described embodiments.

  For example, in the above-described embodiment, the example in which the control rod 32 is arranged along the vertical direction has been described. However, in the transmission operation mechanism of the transmission according to the present invention, the direction of the control rod is not particularly limited.

  As described above, according to the present invention, when the control rod is rotated in conjunction with the shift operation of the change lever via the shift cable, the shift feeling is improved by rotating in conjunction with the control lever. In the transmission operation mechanism of a transmission equipped with a counterweight, the entire transmission operation mechanism in the radial direction of the control rod can be made compact. Therefore, the manufacturing industry of a manual transmission equipped with this type of transmission operation mechanism It may be suitably used in the field.

DESCRIPTION OF SYMBOLS 10 Differential device 11 Differential ring gear 20 Transmission case 30 Shifting operation mechanism 31 Base member 32 Control rod 34 Select outer lever (1st lever part)
40 Shift outer lever (second lever)
70 Counterweight 71 Sleeve part 72 Arm part 73 Weight part 75 Engagement mechanism 76 Groove part 78 Engagement pin (protrusion part)
80 cover member 82 fixed surface portion 84 rising surface portion 86 upper surface portion 123 lower surface portion of transmission case 125 peripheral wall 127 lid member 130 speed change operation mechanism 170 counterweight 171 sleeve portion 172 arm portion 173 weight portion 175 engagement mechanism 178 engagement pin 182 low Friction bush 190 containment chamber

Claims (3)

A control rod that moves in the axial direction in conjunction with the select operation of the change lever and rotates in conjunction with the shift operation, and does not follow the movement in the axial direction of the control rod at the time of the select operation. A transmission operation mechanism of a transmission comprising a counterweight engaged with the control rod so as to rotate in conjunction with the rotation of the control rod;
The counterweight includes a sleeve portion fitted outside the control rod,
The sleeve portion is provided with a groove portion extending in the axial direction,
A transmission operating mechanism for a transmission, wherein a protrusion that protrudes radially outward from the outer peripheral surface of the control rod is engaged with the groove. The counterweight is disposed above the transmission case,
The transmission operation mechanism for a transmission according to claim 1, wherein a cover member that covers the groove portion from the outside is disposed on the transmission case. A first lever portion connected to the change lever via a select cable and a second lever portion connected to the change lever via a shift cable are disposed on one end side of the control rod,
The shift operation mechanism for a transmission according to claim 1, wherein the counterweight and the protrusion are disposed on the other end side of the control rod.

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