JP5652910B2 - Manual transmission - Google Patents

Description

  The present invention relates to a manual transmission for a vehicle.

  Generally, in a manual transmission of a vehicle, an operating force of a shift lever operated by a driver is transmitted to a shift and select shaft slidably supported in a transmission case via a cable or the like. A shift inner lever is fixed to the shift and select shaft, and the shift inner lever is selectively engaged with any one of the shift heads respectively provided on the plurality of shift fork shafts. It has become. Then, the operating force is transmitted to the shift head engaged with the shift inner lever and the shift fork shaft provided with the shift head, and the shift change to the gear stage selected by the driver is executed by the shift lever.

  The shift-and-select shaft (referred to as “shift-and-select shaft” in Patent Document 1) and the shift inner lever of the manual transmission disclosed in Patent Document 1 are moved in the axial direction by the select operation force, and the shift is performed. The inner lever is selectively disposed at a position where it can engage with any one of the shift heads. The shift and select shaft and the shift inner lever are rotated around the axis by the shift operation force, and the shift operation force is transmitted to the shift head engaged with the shift inner lever and the shift fork shaft provided with the shift head. The shift fork provided on the shift fork shaft operates. Thereby, the shift change to the gear stage selected by the driver is executed by the shift lever.

  Patent Documents 2 and 3 disclose a manual transmission provided with a known mechanism that mechanically restricts shifting of a shift lever from a forward shift position to a reverse shift position. This type of mechanism is often referred to as a reverse restricting pin (referred to as “reverse restricting fixing pin” in Patent Document 2) and “restrictive fixing pin” in Patent Document 3, which is arranged parallel to the axis of the shift and select shaft. It is called “strict pin”.

  FIG. 6 shows a shift-and-select shaft 51 of a general conventional manual transmission and its surrounding portion. The shift and select shaft 51 is spline-fitted into the cylindrical base 521 of the shift inner lever 52. A pin 53 is penetrated in the radial direction in the base portion 521 of the shift and select shaft 51 and the shift inner lever 52, whereby the shift and select shaft 51 and the shift inner lever 52 rotate integrally around the axis, and the axial direction To move together.

  Reference numeral 54 denotes a lock ball holder. The lock ball holder 54 includes a pair of leg portions 541, and a lock ball guide 542 formed of a cylindrical body is fixed to one leg portion 541. The lock ball guide 542 includes a lock ball (not shown) and a coil spring (not shown) that presses the lock ball toward the waved portion 522 formed on the base 521 of the shift inner lever 52. Yes. The wavy portion 522 is formed with three grooves, and when the shift lever is disposed at the neutral position or each shift position, the lock ball is fitted into any of the grooves. This realizes a shift feeling that provides a sense of moderation at the neutral position and each gear position when performing a shift operation.

  The shift and select shaft 51 is inserted into the lock ball holder 54 so as to be relatively rotatable. However, the rib 55 formed integrally with the transmission case does not rotate around the axis of the shift and select shaft 51. It is locked. As a result, the position of the lock ball around the axis of the shift and select shaft 51 is fixed, and the same shift feeling can always be maintained.

JP 2006-266467 A JP 2000-249228 A JP-A-6-42637

  However, since the rib 55 that locks the rotation of the lock ball holder 54 is formed integrally with the transmission case, its dimensional tolerance is large, and the gap S between the rib 55 and the lock ball holder 54 is sufficiently small. Difficult to do. For this reason, the lock ball holder 54 and the base 521 (the wave-like portion 522) of the shift inner lever 52 are slightly connected until the gap S is closed during the shift operation, and the shift feeling expected from the design. Could not be obtained.

  The present invention was devised in view of such a problem, and provides a manual transmission that can more reliably regulate the rotation of the lock ball holder around the axis of the shift and select shaft. Objective.

  As means for solving the above-described problems, the manual transmission of the present invention is configured as follows.

That is, the manual transmission of the present invention includes a wavy portion formed at a base portion of a shift inner lever, a lock ball pressed by the wavy portion, a lock ball guide that slidably houses the lock ball, Assuming that the lock ball holder includes a lock ball mechanism having a lock ball holder having a lock ball guide fixed thereto and a shift and select shaft penetrating through the shift and select shaft, the shift and select shaft includes the shift and select shaft. The rotation restricting member engaged with the reverse restrict pin is integrally formed so as to lock the rotation around the axis of the shaft , is fixed in the transmission case, and is a machined part, against reverse restrictocin pin, the rotation restricting member which is integrally formed on the locking ball holder is engaged Tei And it is characterized in that.

  According to the manual transmission having such a configuration, the rotation restricting member formed integrally with the lock ball holder is engaged with the reverse restricting pin which is fixed in the transmission case and is a machined part. Therefore, the engagement gap between the rotation restricting member and the reverse restrict pin is suppressed to a machining dimensional tolerance level.

  According to the manual transmission of the present invention, the lock ball holder is rotated around the axis of the shift and select shaft by suppressing the engagement gap between the rotation restricting member and the reverse restrict pin to a machining dimensional tolerance level. Can be more reliably regulated. Moreover, since the reverse restrict pin existing in parallel with the shift and select shaft is used without providing a rib on the mission case side, the structure can be simplified and the weight can be reduced.

1 is a perspective view showing a shift-and-select shaft of a manual transmission according to an embodiment of the present invention and a configuration around it. It is AA sectional drawing of FIG. It is a top view of a rock ball holder. It is BB sectional drawing of FIG. It is CC sectional drawing of FIG. It is a perspective view which shows the shift and select shaft of the manual transmission which concerns on a prior art example, and the structure around it.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a shift-and-select shaft 1 of a manual transmission according to an embodiment of the present invention and its surrounding configuration.

  The shift and select shaft 1 is slidably supported in a mission case (not shown). A shift operating force and a select operating force of a speed change lever (not shown) operated by the driver are transmitted to the shaft 1 via a cable, an outer lever, and the like. In the present embodiment, the shift and select shaft 1 moves in the axial direction by a select operation force, and rotates around the axis line by a shift operation force.

  A cylindrical base 21 of the shift inner lever 2 is spline-fitted to the shift and select shaft 1, and a slotted pin 3 is passed through the shift and select shaft 1 and the base 21 in the radial direction. As a result, the shift and select shaft 1 and the shift inner lever 2 move integrally in the axial direction and rotate integrally around the axial line.

  The shift inner lever 2 extends to the side of the shift and select shaft 1, and one of shift heads (not shown) provided on each of the plurality of shift fork shafts by rotating the tip thereof. Selectively engaged. Then, the shift operating force is transmitted to the shift head engaged with the shift inner lever 2 and the shift fork shaft provided with the shift head, whereby the synchromesh mechanism or the like is operated, and the driver selects the shift lever. A shift change to the gear position is executed.

  Reference numeral 4 denotes a lock ball mechanism. As shown in FIG. 2, the lock ball mechanism 4 includes a wave-like portion 22 formed on the base portion 21 of the shift inner lever 2, a lock ball 5 pressed toward the wave-like portion 22, and a slide on the lock ball 5. It has a cylindrical lock ball guide 6 that is freely installed, and a lock ball holder 7 on which the lock ball guide 6 is fixed.

  The wavy portion 22 is formed in a predetermined circumferential range of the shift and select shaft 1, and three grooves 221 to 223 are formed in the wavy portion 22. When the speed change lever is disposed at the neutral position, the lock ball 5 is fitted into the middle groove 221, and when the speed change lever is disposed at one shift position, the lock ball 5 is placed on one side of the neutral groove 221. The lock ball 5 is fitted into a groove 223 formed on the other side of the neutral groove 221 when the shift lever is arranged at the other shift position. . This realizes a shift feeling that gives a sense of moderation at the neutral position and each gear position when a shift operation is performed.

  In addition to the lock ball 5, the lock ball guide 6 includes a coil spring 8 that presses the lock ball 5 toward the wave-like portion 22 formed in the base portion 21 of the shift inner lever 2.

  The lock ball holder 7 includes a pair of flat leg portions 71 and 71 arranged in parallel to each other, and an erection portion 72 that is continuously erected on the ends of the leg portions 71 and 71. Yes. The shift and select shaft 1 passes through the pair of leg portions 71 and 71 so as to be relatively rotatable. Further, the pair of leg portions 71 and 71 are disposed so as to sandwich the base portion 21 of the shift inner lever 2. As a result, the lock ball holder 7 cannot move relative to the shift inner lever 2 in the axial direction. The rock ball guide 6 is provided so as to penetrate one leg portion 71 and is welded to the leg portion 71. The lock ball holder 7 is rotatable relative to the shift and select shaft 1 and the shift inner lever 2 around the axis.

  The lock ball holder 7 is integrally formed with a rotation restricting member 9. The rotation restricting member 9 is engaged with the reverse restrict pin 10 so as to lock the rotation of the lock ball holder 7 around the axis of the shift and select shaft 1. For example, as shown in FIGS. 1 and 2, the rotation restricting member 9 has a sandwiching portion 101 that sandwiches the reverse restrict pin 10. Since the pinching portion 101 and the reverse restricting pin 10 have high dimensional accuracy secured by machining or the like, the rotation direction between the pinching portion 101 and the reverse restricting pin 10 (of the shift and select shaft 1) The (circumferential) gap can be reduced to a machining dimensional tolerance level. Although the position of the clamping part 101 that clamps the reverse restricting pin 10 is displaced by the selection operation, the outer diameter of the reverse restricting pin 10 is formed to be the same diameter in an area where the clamping part 101 may be clamped. .

  3 to 5 are diagrams showing specific examples of the lock ball holder 7. In this specific example, the rotation restricting member 9 is a shift-and-select shaft from around the shaft hole 711 (the shift-and-select shaft 1 is inserted into the shaft hole 711) of one leg 71 of the lock ball holder 7. It extends in a direction perpendicular to the axis of one. Reference numeral 712 in FIG. 5 is a through hole provided to allow the lock ball 5 and the coil spring 8 to pass through when assembled in the lock ball guide 6.

  The reverse restrict pin 10 constitutes a part of a mechanism (hereinafter referred to as “misshift prevention mechanism”) that mechanically restricts the shift lever from being shifted directly from the forward shift position to the reverse shift position. Yes, it is supported and fixed in the transmission case in a state of being substantially parallel to the axis of the shift and select shaft 1.

  Various misshift prevention mechanisms are known. The misshift prevention mechanism illustrated in FIGS. 1 and 2 includes a reverse restrict pin 10 and a cam 11 fitted to the reverse restrict pin 10. , And a claw portion 23 formed on the base portion 21 of the shift inner lever 2. The cam 11 can be rotated around the reverse restrict pin 10 only within a predetermined range, and as shown in FIG. 2, the coil 11 is coiled until the cam 11 is engaged with the different diameter step portion 10 a of the reverse restrict pin 10. It is pressed in the axial direction by the spring 12. For example, when the shift lever is moved to the reverse shift position via the neutral position, the claw portion 23 that moves to the axial direction one side (the upper side in FIG. 2) of the shift and select shaft 1 presses the cam 11 in the axial direction. Therefore, the operation of the shift lever is not restricted. Further, when the shift lever is moved from the 5-speed shift position (when a shift gate in which the 5-speed shift position and the reverse shift position are opposed to each other is employed) to the reverse shift position, the shift and select shaft 1 is used. Since the claw portion 23 rotating around the axis of the cam 11 pushes and retracts the cam 11 around the axis, the operation of the shift lever is not restricted. On the other hand, when trying to move the shift lever from the fifth shift position to the reverse shift position, the shift lever rotates about the axis of the shift and select shaft 1 until it reaches an intermediate position between the fifth shift position and the reverse shift position. Although the moving claw 23 pushes and retreats the cam 11 within the predetermined range around the axis, the shift lever is directly reversed from the fifth speed shift position because the cam 11 is further prevented from rotating. It cannot be moved to the shift position.

  According to the manual transmission according to the embodiment of the present invention described above, the lock ball holder 7 is integrated with the reverse restrict pin 10 which is fixed in the mission case and is a machined part. Since the formed rotation restricting member 9 is engaged, the engagement gap between the rotation restricting member 9 and the reverse restrict pin 10 is suppressed to a machining dimensional tolerance level. As a result, the rotation of the lock ball holder 7 around the axis of the shift and select shaft 1 can be more reliably regulated as compared with the manual transmission according to the conventional example.

  Further, according to the manual transmission according to the embodiment of the present invention, since existing components are used without providing a rib on the mission case side, the structure can be simplified and the weight can be reduced. Further, since the reverse restrict pin 10 is substantially parallel to the shift and select shaft 1, a simple shape as described above can be employed as the rotation restricting member.

  The above-described rotation restriction of the lock ball holder 7 can be realized if the reverse restrict pin 10 is fixed in the transmission case in a state parallel or substantially parallel to the shift and select shaft 1. The structure, mechanism, etc. of the misshift prevention mechanism using the strict pin 10 as one component may be of any type.

  The present invention can be applied to a manual transmission mounted on, for example, an automobile.

DESCRIPTION OF SYMBOLS 1 Shift and select shaft 2 Shift inner lever 21 Base part of shift inner lever 22 Wave-like part 4 Lock ball mechanism 5 Lock ball 6 Lock ball guide 7 Lock ball holder 9 Rotation restricting member 10 Reverse restrict pin

Claims (1)

A wavy portion formed at the base of the shift inner lever, a lock ball pressed against the wavy portion, a lock ball guide slidably mounted with the lock ball, and the lock ball guide are fixedly provided, In a manual transmission provided with a lock ball mechanism having a lock ball holder through which a select shaft is penetrated in a relatively rotatable manner,
The lock ball holder is integrally formed with a rotation restricting member engaged with a reverse restrict pin so as to lock the rotation of the lock ball holder around the axis of the shift and select shaft. ,
The rotation restricting member formed integrally with the lock ball holder is engaged with the reverse restrict pin, which is fixed in the mission case and is a machined part ,
A manual transmission characterized by that.