JP2008045594A - Transmission mechanism of manual transmission - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To realize a smooth shift feeling in a shifting without using an inert mass in a transmission mechanism of a manual transmission. <P>SOLUTION: An outer lever 30 installed in one end of a shaft 11 to activate a shift fork 23 to selectively establish a speed change gear train out of a plurality speed change gear trains comprises: a lever main body 31 the base end of which is fastened to a shaft; a connection member 35 rotatably connected to the tip end of the lever main body around a rotation axis line O in parallel with the shaft; and damper members 39a, 39b installed between the lever main body and the connection member to elastically restrict the relative rotation around the rotation axis line of both. The operation force from the change gear lever is added to the position apart from the rotation axis of the connection member, and transmitted to the lever main body via the damper member. The damper member may be disposed between the outside edge 31a of the lever main body and an inside edge 36a of a projection 36 formed in the connection member and extending almost in parallel with the outside edge of the lever main body. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an improvement for improving shift feeling in a transmission mechanism of a manual transmission.

  Since the synchronous clutch mechanism normally used for gear-type manual transmissions has a clutch operating characteristic called “two-stage entry”, there is no reaction force applied from the manual transmission side to the transmission lever side during gear shifting. There is a problem of continuously changing and lowering the shift feeling. Some front-engine / front-drive vehicles, etc., operate a synchronous clutch mechanism with a manual shift lever provided near the driver's seat via a cable-type interlock mechanism. Since the expansion and contraction due to the elastic bending of the cable is large, there is a problem that the shift feeling is further reduced by promoting the discontinuous change of the reaction force applied from the manual transmission side to the transmission lever side during the gear shift described above. .

As means for solving such a problem, for example, as shown in Patent Document 1, there is one in which an inertial mass is provided on a rotating shaft that reciprocates a fork shaft or an inertia lever that is swung in conjunction with the rotating shaft. In Patent Document 1, as a first prior art, a shift cable is locked at one end, and an inertial mass is disposed directly at the other end of the outer lever that swings around the shift and select shaft. The thing which reduces a peak load by inertia and obtains a smooth shift feeling is disclosed. As a second conventional technique, an interlocking inertia lever having an inertial mass is arranged in parallel with an outer lever that is locked with a shift cable at one end and swings around a shift and select shaft. Is disclosed. Further, Patent Document 1 discloses a shift device for an automobile manual transmission in which a shift cable is locked at one end and an outer lever that swings around the axis of the shift and select shaft moves in the axial direction of the shift and select shaft. An inertial mass is provided that engages with the outer lever, is disposed in an orthogonal relationship with the outer lever, and includes an inertial lever that swings in response to the swinging of the outer lever. .
JP 2003-106449 A (paragraph [0004], paragraph [0005], paragraph [0031], FIG. 1 to FIG. 5, FIG. 11, FIG. 12)

  While each of the above-described inertial masses of the prior arts has the effect of giving a smooth shift feeling at the time of shifting, it amplifies the vibration applied to the outer lever from the engine or transmission during traveling after shifting, The amplified vibration is transmitted to a manual shift lever provided near the driver's seat via a cable or the like, which causes a problem that chatter vibration of the shift lever increases. Moreover, since the inertial mass is used to reduce the peak load, there is a problem that the weight of the transmission mechanism of the manual transmission increases.

  An object of the present invention is to solve each of these problems by providing a damper member in the transmission path of the operating force from the speed change lever.

  For this purpose, the transmission mechanism of the manual transmission according to the present invention includes a shaft rotatably supported by a housing, a base end portion fixed to the shaft, and an operating force from a manual shift lever applied to the tip portion. An outer lever that reciprocally rotates the shaft, a fork shaft that is supported by the housing so as to be axially movable and reciprocates in conjunction with the reciprocal rotation of the shaft, and a plurality of transmission gears that are attached to the fork shaft and reciprocally move. In a transmission mechanism of a manual transmission that includes a shift fork that selectively establishes one transmission gear train from a train, an outer lever includes a lever body having a base end fixed to a shaft, and a distal end portion of the lever body. A connecting member that is swingably connected around a rotation axis parallel to the shaft, and a rotation axis that is provided between the lever body and the connection member. It is composed of a damper member that elastically restrains the relative rotation of the gear, and the operation force from the transmission lever is applied to a position away from the rotation axis of the connecting member and transmitted to the lever body via the damper member. It is characterized by this.

  In the transmission mechanism of the manual transmission described in the previous section, an outer lever pin is fixed in parallel to the shaft at a position where the operating force from the speed change lever is applied to the connecting member, and the operating force is rotatably related to the outer lever pin. It is preferable to add via the joined connecting eye member.

  In the transmission mechanism of the manual transmission described in the previous section, it is preferable that the operating force from the transmission lever is applied to the outer lever pin via a shift cable connected to the connection eye member.

  In the transmission mechanism of the manual transmission described in each of the preceding items, the damper member is interposed between the outer edge of the lever body and the inner edge of the protruding portion that is formed integrally with the connecting member and extends opposite the outer edge. It is preferable to use a block made of a flexible elastic material.

  In the transmission mechanism of the manual transmission described in the previous section, it is preferable that a protrusion that protrudes toward the outer edge side of the lever body rather than the inner edge is formed at the distal end portion of the protruding portion of the connecting member that is closer to the distal end than the damper member.

  In the transmission mechanism of the manual transmission described in the preceding item 2, it is preferable that the damper member is fixed to the inner edge of the protrusion or the outer edge of the lever body.

  According to the first aspect of the present invention, the operation force from the manual shift lever applied to the position away from the rotation axis of the connecting member at the time of shifting is transmitted to the lever main body via the damper member to be manually shifted. In response to this, the discontinuously changing reaction force applied from the manual transmission side to the transmission lever side is attenuated by the damper member and transmitted to the transmission lever side, and the reaction force applied to the transmission lever at the time of shifting Since the discontinuous change of is suppressed, the shift feeling becomes smooth. In addition, since a damper member having a much smaller weight is used instead of the inertia mass, the transmission mechanism of the manual transmission is reduced in weight, and vibration applied to the outer lever during traveling after the completion of the shift is also caused by the damper member. Since it is attenuated and transmitted to the shift lever side, chatter vibration does not occur in the shift lever during traveling.

  According to the second aspect of the present invention, the operating force from the speed change lever is transmitted to the connecting member via the outer lever pin and the connecting eye member rotatably engaged with the outer lever pin.

  As described above, the shift mechanism of the manual transmission that reciprocates the fork shaft by reciprocating the shaft via the shift cable is greatly expanded and contracted by the elastic deformation of the shift cable, so that the shift feeling is further reduced. There is a fear. Therefore, the present invention is applied to the transmission mechanism of a manual transmission in which the operating force from the manual transmission lever is applied to the outer lever pin through the shift cable connected to the connection eye member as in claim 3. In particular, a particularly great effect can be obtained.

  According to the fourth aspect of the present invention, the damper member is a flexible member that is interposed between the outer edge of the lever main body and the inner edge of the protrusion that is formed integrally with the connecting member and extends opposite the outer edge. Since the damper member is simplified by the block shape made of an elastic material, the manufacturing cost of the transmission mechanism of the manual transmission can be reduced.

  According to the fifth aspect of the present invention, the protrusion that protrudes to the outer edge side of the lever body from the inner edge is formed at the distal end portion of the protruding portion of the connecting member that is the tip side from the damper member. If the damper member made of a flexible elastic material is compressed to some extent by the operating force from the speed change lever, the protrusion of the protruding portion of the connecting member comes into contact with the outer edge of the lever body, and the damper member is excessively compressed. Since this can be prevented, the durability of the damper member can be enhanced.

  According to the sixth aspect of the present invention, the damper member is fixed to the inner edge of the protrusion or the outer edge of the lever body, and the mounting structure of the damper member can be simplified, so that the manufacturing cost of the transmission mechanism of the manual transmission can be reduced. Can be reduced.

  The best mode for carrying out the transmission mechanism of the manual transmission according to the present invention will be described below with reference to FIGS. As shown in FIG. 1, a manual transmission to which the present invention is applied is provided with a selective gear type speed change mechanism (not shown) in a housing 10 having two parts integrally screwed to each other. 10, a shift and select shaft (shaft) 11 is supported so as to be rotatable and movable in the axial direction, and three fork shafts 20 to 22 are supported so as to be slidable in the axial direction perpendicular to the shift and select shaft 11. Has been. Each of the fork shafts 20 to 22 is engaged with a part of a selected gear type transmission (for example, a clutch hub sleeve of a synchronous clutch mechanism (not shown)) and shift forks 23 (of the three) Only one is indicated by a two-dot chain line).

  The front ends of the shift heads 20a to 22a provided integrally with the fork shafts 20 to 22 are overlapped with each other with a slight gap, and the front ends of the front ends are opened to the same size. A notch is formed. The shift head member 12 fixed to the intermediate portion of the shift and select shaft 11 with a spline and a pin has a head portion 12a protruding in the radial direction, and the tip portion of each head portion 12a is the tip portion of each of the shift heads 20a to 22a. Each of the cutouts has a shape that can be slidably engaged with a slight gap in each notch. The shift and select shaft 11 is urged from both sides by a first spring 13, a second spring 14, and a flange collar 15 interposed between the housing 10 and the urging force of the first spring 13 is the second spring 14. It is set smaller than the urging force. Therefore, in the free state, the head portion 12a of the shift head member 12 is engaged in the notch of the first shift head 20a.

  As shown in FIG. 1, an annular groove 11 a is formed in a part of the shift and select shaft 11 located inside the housing 10, and the shift and select shaft 11 and the housing 10 are arranged at positions corresponding to the grooves 11 a. An orthogonal select shaft 16 is rotatably supported, and a select arm 17 is fixed to one end portion of the select shaft 16 in the housing 10 by a pin or the like, and a tip portion thereof is formed in a groove portion 11 a of the shift and select shaft 11. Is engaged. A select lever 18 that protrudes in the radial direction is fixed to the tip of the select shaft 16 protruding from the housing 10 by caulking or the like, and the tip of the select lever 18 is caulked to be parallel to the select shaft 16 or the like. The select cable pin 18a fixed by the is connected to a manual shift lever provided near the driver's seat via a select cable (not shown) provided with a connecting eye member at the tip similar to the shift cable 41 described later. Yes. By pulling or loosening the select cable, the select lever 18 is swung, and the shift and select shaft 11 is reciprocated in the axial direction via the select shaft 16 and the select arm 17.

  In FIG. 1, an outer lever 30 including a lever main body 31 and a connecting member 35 is attached to a distal end portion of a shift and select shaft 11 that protrudes rightward from the housing 10. As shown in FIGS. 2 and 3, the lever main body 31 made of a thick plate bent in a Z-shape with a shallow angle so that the base end portion and the tip end portion are parallel to each other has a base end portion that is a shift-and-select shaft. 11 is fixed by caulking or the like at right angles to the distal end portion, and a deep support groove 32 is formed at the central portion in the thickness direction of the distal end portion. The connecting member 35 is made of a thick plate having the same thickness as the lever main body 31, and a thin portion 37 formed at the center is slidably inserted into the support groove 32 of the lever main body 31 and is shifted by the pivot pin 33. It is slidably connected around a rotation axis O parallel to the AND select shaft 11. The connecting member 35 is integrally formed with a pair of projecting portions 36 extending in parallel toward the shift and select shaft 11 so as to sandwich both sides of the lever main body 31 from both outer portions of the thin portion 37. An outer lever pin 38 is fixed by caulking or the like so as to be parallel to the shift and select shaft 11 at a position away from the pins 33 on the side opposite to the projecting portions 36.

  Between the inner edge 36a of each protrusion 36 and both outer edges 31a of the lever body 31, it is made of an elastic material such as rubber and having a large internal friction, and is a rectangular cube having the same thickness as the members 31 and 35. Block-shaped damper members 39a and 39b are respectively interposed. Each damper member 39a, 39b has one side edge fixed to the inner edge 36a of each projection 36 by bonding or baking, and in the free state where no external force is applied to the outer lever pin 38, the opposite side edge is The lever body 31 is in contact with each outer edge 31a with the same force. A protrusion 36 b that protrudes from the inner edge 36 a toward the outer edge 31 a of the lever body 31 is formed at the tip of the protrusion 36 that is farther from the pivot pin 33 than the damper members 39 a and 39 b.

  One end of a shift cable 41 is connected to the outer lever pin 38 via a connecting eye member 40 that is rotatably fitted to the outer periphery of the outer lever pin 38, and the other end of the shift cable 41 is a manual speed change provided near the driver's seat. It is connected to the lever. In this embodiment, the shift and select shaft 11 is elastically biased by a torsion spring (not shown) in a direction opposite to the rotation when pulled by the shift cable 41 (clockwise direction in FIG. 2). As a result, the lever body 31 and the shift and select shaft 11 are reciprocally rotated via the damper member 39a on the lower side in FIG. 2 by pulling or loosening the shift cable 41 with a manual shift lever.

  Next, the operation of the above-described embodiment will be described. The manual shift lever provided near the driver's seat can be operated at three positions in the select direction and the shift direction. At the center position in the select direction, the head portion 12a of the shift head member 12 is as shown in FIG. The second shift head 21a is engaged in a notch at the tip. If the shift lever is operated in one direction in the select direction from this state, the shift and select shaft 11 is moved to the left in FIG. 1 via the select cable, the select lever 18, the select shaft 16 and the select arm 17, and the head is moved. When the shift lever is operated in the opposite direction in the select direction, the shift and select shaft 11 is similarly moved to the right and the head portion 12a is engaged. Is engaged in a notch at the tip of the third shift head 22a.

  If the shift lever is in the center position in the shift direction in a state where the head portion 12a of the shift head member 12 is engaged with any one of the notches of the three shift heads 20a to 22a, each fork shaft 20 to No. 22 is in a neutral position, and the clutch hub sleeve of the synchronous clutch mechanism engaged with each shift fork 23 is also in a neutral position and is not engaged with any of the transmission gears on both sides thereof. In this neutral position, the shift cable 41 is tensioned by the urging force of the torsion spring provided on the shift and select shaft 11, so that the connecting member 35 swings around the pivot pin 33 with respect to the lever body 31. 2, the lower damper member 39a in FIG. 2 is compressed, and the pressing force on the outer edge 31a of the lever body 31 is larger than the above-described free state, while the upper damper member 39b is against the outer edge 31a. The pressing force becomes zero and a gap is formed between the outer edge 31a and the pressing force on the outer edge 31a is reduced even if no gap is generated.

  When the shift lever is operated from this neutral position in the direction in which the shift cable 41 is loosened in the shift direction, it is transmitted to the lever main body 31 from the pull force of the shift cable 41, and hence from the outer lever pin 38 to the lever body 31 via the connecting member 35 and the damper member 39a. The shift and select shaft 11 is rotated in the clockwise direction in FIG. 2 by the torsion spring, and the corresponding fork shaft moves forward in FIG. 1 and is shifted by the shift fork 23 fixed thereto. A transmission gear on one side of the corresponding synchronous clutch mechanism is engaged, and a corresponding transmission gear train is established. At this time, since the force transmitted from the connecting member 35 to the lever main body 31 via the damper member 39 a is reduced, the bending of the damper member 39 a is reduced, and the connecting member 35 is centered on the pivot pin 33 with respect to the lever main body 31. Is swung back in the clockwise direction.

  If the shift lever is operated in the shift direction from the neutral position in the opposite direction, the shift cable 41 is pulled, and the shift and select shaft 11 is rotated in the opposite direction against the torsion spring. The fork shaft moves in the opposite direction to the above, the transmission gear on the opposite side of the synchronous clutch mechanism is engaged, and the corresponding transmission gear train is established. In this case, since the force transmitted from the connecting member 35 to the lever main body 31 via the damper member 39a increases, the damper member 39a is compressed to increase the bending, and the connecting member 35 is pivotally supported with respect to the lever main body 31. The pin 33 is swung in the clockwise direction around the center. In this case, if the damper member 39a is compressed and the flexure increases, the protrusion 36b formed at the tip of the protruding portion 36 on that side approaches the outer edge 31a of the lever main body 31, and as shown by a two-dot chain line 35A. If contacted, the damper member 39a will not be compressed any further, and the durability can be improved.

  In a synchronous clutch mechanism using a synchronizer ring that is normally used for a gear-type manual transmission, the internal spline of the sleeve moved by the shift fork 23 first contacts and meshes with the external spline of the synchronizer ring, and then shifts. Since it contacts and meshes with an external spline of a gear piece fixed to the gear, it has a clutch operation characteristic called two-stage entry. For this reason, there is a problem that the reaction force applied from the lever body 31 to the speed change lever side during the gear shift also changes discontinuously and lowers the shift feeling.

  However, according to the above-described embodiment, the discontinuously changing reaction force is absorbed and attenuated by the internal friction of the damper member 39a interposed in the transmission path of the operating force from the shift lever, so that the shift lever side Is transmitted to. As a result, the discontinuous change in the reaction force applied to the shift lever during the shift is suppressed, so that the shift feeling becomes smooth. In addition, vibration applied to the outer lever during travel after the completion of the shift is attenuated by the damper members 39a and 39b and transmitted to the shift lever side, so that chatter vibration does not occur in the shift lever during travel. Further, instead of the inertia mass conventionally used to solve the above-described problem, damper members 39a and 39b having a much smaller weight are used, so that the transmission mechanism of the manual transmission is reduced in weight. The

  In the above-described embodiment, the operating force from the speed change lever is transmitted to the lever main body 31 via the outer lever pin 38 fixed to the connecting member 35 and the connecting eye member 40 rotatably fitted thereto. The lever pin 38 and the connecting eye member 40 may be connected to each other by interposing a number of steel balls or needle rollers therebetween, so that the operation of the transmission mechanism of the manual transmission can be further smoothed. it can.

  Further, in the above-described embodiment, the outer lever pin 38 of the outer lever 30 is connected to the transmission lever via the shift cable 41, and the shift cable 41 is greatly expanded and contracted due to elastic bending, so that the manual transmission side is used during gear shifting. Therefore, the discontinuous change of the reaction force applied to the shift lever side is promoted, and the shift feeling is likely to be further lowered. Therefore, when the present invention is applied to a transmission mechanism of a manual transmission in which the shift and select shaft 11 is reciprocally rotated via the shift cable 41, a particularly great effect is obtained.

  Further, in the above-described embodiment, the protrusion 36b that protrudes toward the outer edge 31a of the lever main body 31 from the inner edge 36a is formed at the distal end of the protrusion 36 of the connecting member 35 that is at the tip side of the damper members 39a and 39b. In this way, when the damper members 39a and 39b made of a flexible elastic material are compressed to some extent by the operating force from the manual transmission lever, the protrusion 36b of the protrusion 36 of the connecting member 35 is formed on the lever body 31. Since the damper members 39a and 39b can be prevented from being excessively compressed by being brought into contact with the outer edge 31a, the durability of the damper members 39a and 39b can be improved.

  Further, in the above-described embodiment, the damper members 39a and 39b are fixed to the inner edge 36a of the projecting portion 36 by adhesion or the like, and the mounting structure of the damper members 39a and 39b can be simplified. Manufacturing cost can be reduced. However, the present invention is not limited to this, and the damper members 39a and 39b may be fixed to the outer edge 31a side of the lever body 31, or instead of being fixed, the damper member 39a is formed by a protrusion and a recess that are engaged with each other. , 39b may be attached to the lever body 31 or the connecting member 35 so as not to be easily detached.

  In the embodiment described above, the outer lever 30 and the shift and select shaft 11 are urged clockwise in FIG. 2 by the torsion spring, and the urging force of the torsion spring is applied by the single shift cable 41 connected to the outer lever pin 38. In this case, the damper member 39b and the protruding portion 36 on the upper side in FIG. 2 are hardly used and can be omitted. However, in the present invention, the torsion spring is omitted, two shift cables are connected to the outer lever pin 38, and the shift and select shaft 11 is rotated in both the clockwise and counterclockwise directions by the shift lever. In this case, it is necessary to provide damper members 39a and 39b as a pair with the protruding portions 36 of the connecting member 35 between the outer edges 31a on both sides of the lever main body 31, respectively. In any case, the damper member provided between the lever main body 31 and the connecting member 35 elastically restrains the relative rotation of the both 31 and 35 about the pivot pin 33 and both of them by internal friction. The kinetic energy of the relative rotation of 31 and 35 is absorbed.

  In the embodiment described above, each of the fork shafts 20 to 22 has been described as reciprocating from the neutral position to both sides in the axial direction to switch the transmission gear, but the present invention is not limited to this. Depending on the configuration of the transmission, the transmission gear can be switched by reciprocating only from the neutral position to one side in the axial direction.

It is sectional drawing which shows the whole structure of one Embodiment of the transmission mechanism of the manual transmission by this invention. It is a front view in the free state of the outer lever of embodiment shown in FIG. FIG. 3 is a cross-sectional view taken along the line 3-3 in FIG. 2.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Housing, 11 ... Shaft (shift and select shaft), 20-22 ... Fork shaft, 23 ... Shift fork, 30 ... Outer lever, 31 ... Lever main body, 31a ... Outer edge, 35 ... Connecting member, 36 ... Projection part, 36a ... inner edge, 36b ... projection, 38 ... outer lever pin, 39a, 39b ... damper member, 40 ... connecting eye member, 41 ... shift cable, O ... rotating axis.

Claims (6)

  A shaft rotatably supported by the housing, an outer lever that has a base end fixed to the shaft, and an operating force from a manual shift lever is applied to the distal end to rotate the shaft back and forth, and an axis line to the housing A fork shaft that is supported so as to move in a direction and is reciprocated in conjunction with reciprocating rotation of the shaft, and one transmission gear train is selectively selected from a plurality of transmission gear trains attached to the fork shaft by the reciprocation. In the transmission mechanism of a manual transmission having a shift fork to be established, the outer lever includes a lever body whose base end is fixed to the shaft, and a rotation axis parallel to the shaft at the distal end of the lever body. A connecting member that is swingably connected to the lever body, and a relative rotation of the both around the rotation axis. The operation force from the speed change lever is applied to a position away from the rotation axis of the connecting member and is transmitted to the lever body via the damper member. A transmission mechanism of a manual transmission characterized by the above.   2. The speed change mechanism for a manual transmission according to claim 1, wherein an outer lever pin is fixed to the connecting member in a position parallel to the shaft at a position where an operation force from the speed change lever is applied, and the operation force is the outer lever pin. A transmission mechanism for a manual transmission, wherein the transmission mechanism is added via a connecting eye member rotatably engaged with the transmission mechanism.   3. The manual transmission transmission mechanism according to claim 2, wherein an operating force from the transmission lever is applied to the outer lever pin through a shift cable connected to the connection eye member. mechanism.   4. The manual transmission gear shifting mechanism according to claim 1, wherein the damper member is formed integrally with an outer edge of the lever main body and the connecting member and faces the outer edge. 5. A shifting mechanism for a manual transmission, characterized in that it is in the form of a block made of a flexible elastic material interposed between the inner edges of the projecting portions extending in the direction of the projection.   5. The transmission mechanism for a manual transmission according to claim 4, wherein a protrusion projecting toward the outer edge side of the lever body from the inner edge is formed at a distal end part of the projecting part of the connecting member, which is located at the distal end side with respect to the damper member. A transmission mechanism for a manual transmission, characterized in that 6. The transmission mechanism of a manual transmission according to claim 4, wherein the damper member is fixed to an inner edge of the protrusion or an outer edge of the lever body.

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