JP2012077856A - Gear squeak preventing device of manual transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gear squeak preventing device for a manual transmission capable of preventing gears from squeaking surely while a sufficient working time period and working amount are secured.SOLUTION: The gear squeak preventing device for manual transmission is equipped with a rotation part 25 that moves in the axial direction along a shift select shaft when selection is made for the shift select shaft 21 to be put into the reverse range, a pre-boke cam 52 to rotate upon receiving a moving force in the axial direction of the rotation part, and a protrusion part 41 provided on a forward range shift lug 40 for actuating a synchronizer when selection is made for the shift select shaft to be put into the reverse range by moving a forward range shift rail 33 along the axis upon receiving a rotational force of the pre-boke cam, wherein the pre-boke cam is furnished with a projection 56 extending toward the shift select shaft, while the rotation part is furnished with a pre-boke pin 51 extending toward the pre-boke cam and capable of making engagement with the projection.

Description

  The present invention relates to an apparatus for preventing gear ringing when shifting to a reverse gear in a manual transmission for a vehicle such as an automobile that has a synchronizer for a forward gear but does not have a synchronizer for a reverse gear.

  2. Description of the Related Art Conventionally, some manual transmissions for vehicles have a forward gear synchronization device, but do not have a reverse gear synchronization device. By the way, when performing a shift change to the reverse gear, the input shaft may rotate by inertia, and in this case, a rotational difference is generated between the shafts provided with the reverse gears. When the rotation difference of the shaft is large, the reverse gear cannot be engaged smoothly and a gear squeal (abnormal noise) may occur. In order to prevent the occurrence of such a gear squeal, a manual squeal prevention device is usually provided in a manual transmission that does not include a reverse gear synchronization device.

  Various gear noise prevention devices for manual transmissions have been developed. For example, Patent Document 1 discloses a gear noise prevention device for a transmission in which a cam plate having a cam groove formed on a sleeve of a control rod is fixed, and a pin engaging with the cam groove is fixed to a sleeve of a shift rod. Is disclosed. In this gear squeezing prevention device of the transmission, there is a synchronous meshing device (synchronizing device) that selects a gear device for a specific forward gear by moving the shift rod slightly in the axial direction when the shift lever is selected toward the reverse gear. It comes to work. Due to the operation of this device, the primary shaft (input shaft) and the secondary shaft (output shaft) are in a transmission state, and the rotation of the primary shaft is reduced or stopped, and the occurrence of gear noise due to the difference in rotation between these shafts occurs. Is preventing.

Japanese Utility Model Laid-Open No. 5-1059 (see, for example, paragraphs [0014]-[0017], [FIG. 3]-[FIG. 4], etc.) of the specification)

  In the gear squeal prevention device described in Patent Document 1 described above, the position where the synchromesh device is operated and the select operation is completed only within a very limited range in which the shift rod moves in the axial direction due to the shape of the cam groove. Then, the synchronous meshing device is released. Therefore, the operation of the synchronous meshing device is performed only temporarily, and the reverse gear meshes with insufficient rotation reduction of the primary shaft, and there is a possibility that gear squeal may occur.

  From the above, the present invention has been made to solve the above-described problems, and when shifting to the reverse gear, the forward gear synchronizer is operated until the selection operation is completed. Accordingly, it is an object of the present invention to provide a gear squeezing prevention device for a manual transmission that can ensure a sufficient operation time and a sufficient operation amount to prevent gear squeal more reliably.

A gear squeezing prevention device for a manual transmission according to a first invention for solving the above-described problem is provided.
A shift select shaft that performs a select operation that moves in the axial direction during a shift operation and a shift operation that rotates about the shaft, a forward shift lug linked to the shift select shaft, and a shift rail for the forward shift lug A forward shift fork for performing a shift operation to a predetermined forward stage while operating a synchronizer in accordance with the shift operation of the shift select shaft, and a reverse shift lug linked to the shift select shaft And a reverse gear shift fork that is connected to the reverse gear shift lug via a shift rail and performs a shift operation to the reverse gear in accordance with the shift operation of the shift select shaft.
A first rotating portion that moves in the axial direction along the shift select shaft during a select operation toward the reverse stage of the shift select shaft;
A pre-balk cam that rotates in response to an axial movement force of the first rotation part;
The shift gear for the forward gear is provided in the shift lug for the forward gear, and receives the rotational force of the pre-balk cam and moves the shift rail for the forward gear in the direction along the axis, so that during the select operation toward the reverse gear of the shift select shaft, A protrusion for operating the synchronization device;
A protrusion extending toward the shift select shaft is provided on the pre-balk cam,
A pre-balk pin that extends toward the pre-balk cam and can be engaged with the protrusion is provided in the first rotating part.

A gear squeezing prevention device for a manual transmission according to a second invention for solving the above-described problem is provided.
A gear noise prevention device for a manual transmission according to a first invention,
The pre-balk cam is provided with an engaging portion that can be engaged with the protrusion provided on the forward shift lug.

A gear squeezing prevention device for a manual transmission according to a third invention for solving the above-described problem is provided.
A gear noise prevention device for a manual transmission according to a first invention,
The pre-balk cam is rotatably connected to a pre-balk cam bracket fixed to the transmission case by a connector,
The pre-balk cam, the pre-balk cam bracket, and the connector are wound around with a spring.

A gear squeezing prevention device for a manual transmission according to a fourth invention for solving the above-described problem is provided.
A gear noise prevention device for a manual transmission according to a first invention,
A second rotating portion provided on the shift select shaft, to which a select operation of the shift lever is transmitted;
A spring is wound around the first rotating part and the second rotating part.

  According to the gear squeezing prevention device for a manual transmission according to the present invention, when shifting to the reverse gear, the forward gear synchronizer can be operated until the selection operation is completed. Thereby, sufficient operation time and sufficient operation amount can be ensured, and gear ringing can be prevented more reliably.

It is a side view of the gear noise prevention apparatus of the manual transmission which concerns on one Embodiment of this invention. It is a top view of the gear noise prevention apparatus of the manual transmission which concerns on one Embodiment of this invention. It is explanatory drawing when a shift lever exists in a neutral state, Comprising: FIG. 3A shows the plane, FIG. 3B shows the front, FIG. 3C shows the side. FIG. 4A is an explanatory diagram when the shift lever is in the 1st, 2nd speed select state, FIG. 4A shows the plane, FIG. 4B shows the front, and FIG. 4C shows the side. It is explanatory drawing when a shift lever is in a reverse select state, Comprising: FIG. 5A shows the plane, FIG. 5B shows the front, FIG. 5C shows the side. It is explanatory drawing when a shift lever is in a reverse shift entering state, Comprising: The plane is shown to FIG. 6A, the front is shown to FIG. 6B, The side is shown to FIG. 6C. FIG. 7A is an explanatory diagram when the shift lever is in a reverse select (shift-out) state, FIG. 7A shows the plane, FIG. 7B shows the front, and FIG. 7C shows the side. FIG. 8A is an explanatory diagram when the shift lever is shifted from reverse and is in the 1st, 2nd speed select state, FIG. 8A shows its plane, FIG. 8B shows its front, and FIG. 8C shows its side. It is explanatory drawing of the shift pattern of a shift lever.

  Hereinafter, a gear noise prevention device for a manual transmission according to an embodiment of the present invention will be described with reference to FIGS.

  In the present embodiment, a description will be given of a case where the present invention is applied to a manual transmission of a six-speed manual transmission that includes a forward gear synchronizer but does not include a reverse gear synchronizer. The gear squeal prevention device is a device that prevents the occurrence of gear squeal when shifting to the reverse gear, and when the select operation is performed, the forward gear synchronizer is activated (for example, 5-6 speed). When the input shaft rotation is sufficiently reduced or stopped and the shift operation is performed (by operating the synchronizer for 5th gear), the operation of the synchronizer for the forward gear is released and the reverse gear is engaged. Is. In the present embodiment, a gear sounding device that prevents the occurrence of gear noise by operating the 5-6 speed synchronization device will be described as an example, but the synchronization device used to prevent the occurrence of gear noise is Other than the 5-6 speed synchronizer may be used.

  In the manual transmission, as shown in FIG. 9, the shift lever 103 for selecting a desired gear is in accordance with the shift pattern 100 in the left-right direction with respect to the traveling direction of the vehicle and the traveling direction of the vehicle. It is configured in a shape that can be operated in the shift direction Y that is the front-rear direction. In the shift pattern 100, one shift path 101d extending in the vehicle front direction from the neutral position and three shift paths 101a to 101c extending in the vehicle front-rear direction across the neutral position are arranged in the vehicle width direction. The neutral positions 101a to 101d are communicated via the select road 102. That is, the reverse select position that is the neutral position of the shift path 101d, the 1-2 speed select position that is the neutral position of the shift path 101a, the 3-4 speed select position that is the neutral position of the shift path 101b, and the neutral position of the shift path 101c. The 5-6 speed select positions are adjacent in this order.

  As shown in FIGS. 1 and 2, the shift lever 103 is connected to the select lever 3 via a select cable (not shown), and is connected to the shift lever 7 via a shift cable (not shown). ing. Thus, when the shift lever 103 is operated in the select direction, this operating force is transmitted to the select lever 3 by the select cable. When the shift lever 103 is operated in the shift direction, this operating force is transmitted to the shift lever 7 by the shift cable.

  The select lever 3 is attached to the transmission case 1 by bearings 91 and 91 so as to be rotatable. The select lever 3 includes a shaft body 4 to which a select cable is connected and an arm portion 5 attached to the lower end portion of the shaft body 4. The arm portion 5 extends upward of a shift select shaft 21 described later. A hemispherical engagement portion 6 that can be engaged with an engagement groove 22c of a selection operation rotation portion 22 described later is attached to the distal end portion of the arm portion 5. Therefore, when the shift lever 103 is selected in the select direction, it is transmitted to the select lever 3 by the select cable, and the select lever 3 for the select operation rotation unit 22, the reverse gear rotation unit 23, which will be described later, The prebake turning portion 25 slides in the axial direction, and becomes a slide position corresponding to the operation position of the shift lever 103.

  The shift lever 7 is rotatably attached to the transmission case 1. The shift lever 7 includes a shaft body 8, a crank portion 9, and an engagement portion 10. The shift cable described above is connected to the base end side of the shaft body 8. The distal end portion side of the shaft body 8 is connected to the proximal end portion side of the crank portion 9 via an engagement pin 81. A hemispherical engagement portion 10 that can be engaged with an engagement groove 24a of a shift operation rotation portion 24 described later is attached to the distal end portion of the crank portion 9. Therefore, when the shift lever 103 is shifted in the shift direction, it is transmitted to the shift lever 7 by the shift cable, and the shift select shaft 21 is rotated around the axis by the shift lever 7, so that the operation position of the shift lever 103 is It becomes the rotation position according to.

  A shift select shaft 21 is attached to the transmission case 1 so as to be orthogonal to the axial direction of the shaft body 4 of the select lever 3 and to be rotatable around the shaft by bearings 92 and 92.

  The shift select shaft 21 includes a select operation rotation section (second rotation section) 22, a reverse rotation section 23, a shift operation rotation section 24, and a prebake rotation section (first rotation). Part) 25 is attached.

  The select operation rotation unit 22 is fixed to the reverse gear rotation unit 23, and the reverse gear rotation unit 23 is fixed to the shift select shaft 21 so as to be movable in the axial direction, and rotates integrally with the shift select shaft 21. A forward shift lever 22b and an engaging groove 22c are provided on the outer peripheral portion 22a of the select operation turning portion 22. The forward gear shift finger 22b extends in a direction perpendicular to the axis of the shift select shaft 21, and is formed so as to be engageable with recesses of forward gear shift lugs 38, 39, and 40, which will be described later. The engaging portion 6 of the select lever 3 is fitted in the engaging groove 22c. Therefore, when the shift lever 103 is selected in the select direction and placed in the 1-2 speed select position, the 3-4 speed select position, and the 5-6 speed select position, this operating force is selected by the select cable. 3 is transmitted. The operating force transmitted to the selection lever 3 is transmitted to the reverse stage rotation unit 23 via the arm unit 5, the engagement unit 6, and the selection operation rotation unit 22. As a result, the select operation turning section 22, the reverse stage turning section 23, and the prebake turning section 25 move in the axial direction, and become positions corresponding to the operation position of the shift lever 103. As a result, the forward gear shift finger 22b is engaged with the shift lugs 38, 39, and 40 corresponding to the operation position of the shift lever 103.

  The prebalk rotation unit 25 is disposed adjacent to the selection operation rotation unit 22. A coil spring 26 is wound around a locking portion 25 b provided in the prebake rotation portion 25 and a locking portion 22 d provided in the selection operation rotation portion 22. Therefore, the rotation of the pre-boke turning unit 25 with respect to the circumferential direction of the shift select shaft 21 is restricted by the circumferential biasing force of the coil spring 26. The prebake turning portion 25 is provided with a shaft-like preboke pin 51. The pre-boke pin 51 extends toward a pre-boke cam 52 described later, and can engage with a protrusion 56 provided on the pre-boke cam 52.

  The reverse gear rotation portion 23 is fixed to the shift select shaft 21 so as to be movable in the axial direction, and rotates integrally with the shift select shaft 21. The reverse rotation unit 23 is disposed adjacent to the prebake rotation unit 25. The reverse gear rotation portion 23 is provided with a reverse gear shift finger 23a. The reverse gear shift finger 23a extends in a direction perpendicular to the axis of the shift select shaft 21, and is formed to be engageable with a recess of a reverse gear shift lug 43, which will be described later. Therefore, when the shift lever 103 is selected in the select direction and placed at the reverse select position, this operating force is transmitted to the select lever 3 by the select cable. The operating force transmitted to the selection lever 3 is transmitted to the reverse stage rotation unit 23 via the arm unit 5, the engagement unit 6, and the selection operation rotation unit 22. As a result, the select operation turning section 22, the reverse stage turning section 23, and the prebake turning section 25 move in the axial direction, and become positions corresponding to the operation position of the shift lever 103. As a result, the reverse gear shift finger 23 a is engaged with the shift lug 43 corresponding to the operation position of the shift lever 103.

  The shift operation rotating portion 24 is fixed to the shift select shaft 21 by the engaging pin 82 and rotates integrally with the shift select shaft 21. An engaging groove 24 a that can be engaged with the engaging portion 10 of the shift lever 7 is formed on the outer peripheral portion of the shift operation rotating portion 24. The engagement groove 24 a extends in parallel with the axial direction of the shift select shaft 21. Therefore, when the shift lever 103 is shifted in the shift direction, this operating force is transmitted to the shift lever 7 by the shift cable. The operating force transmitted to the shift lever 7 is transmitted to the shift select shaft 21 via the shaft body 8, the crank portion 9, the engaging portion 10, and the shift operation rotating portion 24. As a result, the shift select shaft 21 rotates around the axis, and becomes a position corresponding to the operation position of the shift lever 103. As a result, the shift lug selected by the shift finger moves in the axial direction of the shift rail, and the predetermined shift fork rotates in the predetermined direction along with this movement. At the time of shifting to the forward gear, the forward shift fork performs a shift operation to a predetermined forward gear while operating the synchronization device in accordance with the shift operation of the shift select shaft 21. On the other hand, at the time of shifting to the reverse gear, the reverse gear shift fork executes a shift operation to the reverse gear as the shift select shaft 21 shifts.

  The transmission case 1 includes a forward gear 1-2 speed shift rail 31, a forward gear 3-4 speed shift rail 32, and a forward gear, so as to extend along a direction orthogonal to the shift select shaft 21. Shift gears 33 for 5-6 speed and reverse gear are arranged in parallel, and each shift rail 31, 32, 33 is provided so as to be movable in the axial direction. The shift rails 31, 32, 33 are integrally formed with bifurcated shift lugs 38, 39, 40, 43 in which engaging portions protruding outward from the shift fingers 22 b, 23 a are fitted and meshed. . Further, shift forks 34, 35, 36, and 37 for connecting a transmission gear (not shown) are connected to the shift rails 31, 32, and 33 by connecting pins 83, 84, and 85, respectively. Therefore, when the shaft body 4 of the select lever 3 rotates, the shift fingers 22b and 23a move along the axial direction of the shift select shaft 21 to select a desired shift lug, and the shaft body 8 of the shift lever 7 rotates. When moved, the shift select shaft 21 rotates around the axis so that the shift rail to which the selected shift lug is connected moves in the axial direction.

  Further, a protruding portion 41 that protrudes toward a pre-boke cam 52 described later is provided on the upper portion of the 5-6 speed shift lug 40. An inclined surface portion 42 is formed at the tip of the protruding portion 41. As a result, when the pre-balk cam 52 described later rotates around the rivet 60, the lower curved extension portion (engagement portion) 55 of the pre-boke cam 52 comes into contact with the inclined surface portion 42 of the protruding portion 41 of the 5-6 speed shift lug 40. The 5-6 speed shift lug 40 moves smoothly along the axial direction of the shift rail 33. Along with this, the specific forward gear synchronizer operates, the gear selected by the specific forward gear synchronizer is fixed to the output shaft, and the inertia gear rotates to the output shaft that stops rotating at the same time as the vehicle stops. The input shaft is linked, and the rotation of the input shaft is reduced or stopped.

  The shift rail 31 is formed with three recesses 31b, 31a, 31c adjacent to the first speed shift position, the neutral position, and the second speed shift position. The shift rail 32 is formed with three recesses 32b, 32a, 32c adjacent to the third speed shift position, the neutral position, and the fourth speed shift position. The shift rail 33 is formed with three recesses 33b, 33a, 33c adjacent to the 5th and reverse shift positions, the neutral position, and the 6th shift position. A positioning mechanism (detent) 70 is provided adjacent to the shift rails 31 to 33. The positioning mechanism 70 includes a bottomed cylindrical member 72, a spring 74, and a check ball (piece) 75. The bottomed cylindrical member 72 is fixed to the hole 71 a of the bracket 71. The bracket 71 is fixed to the transmission case 1. The spring 74 and the check ball 75 are disposed in the bottomed cylindrical member 72, and the check ball 75 is urged toward the shift rail by the spring 74. Accordingly, the shift rail 31 is selectively positioned at any one of the first speed shift position, the neutral position, and the second speed shift position. The shift rail 32 is selectively positioned at any one of the third speed shift position, the neutral position, and the fourth speed shift position. The shift rail 33 is selectively positioned at any one of the fifth speed and reverse shift positions, the neutral position, and the sixth speed shift position.

  In the transmission casing 1, a pre-balk cam 52 is rotatably provided adjacent to the shift select shaft 21. The pre-balk cam 52 is substantially Y-shaped, and includes a right extending portion 53 extending to the right side, an upper extending portion 54 extending upward, and a lower curved extending portion 55 extending curved downward. And have. The upper extension 54 is provided with a protrusion 56. The protrusion 56 protrudes (extends) toward the shift select shaft 21, and the protrusion 56 can be engaged with the pre-boke pin 51.

  The pre-balk cam 52 is fixed to the transmission case 1 via a pre-balk cam bracket 57. The pre-balk cam 52 is connected to a pre-balk cam bracket 57 by a rivet (connector) 60 so as to be rotatable. A spring 59 is wound around the rivet 60 and the right extending portion 53 of the pre-boke cam 52 and the engaging portion 57a provided on the pre-boke cam bracket 57. Therefore, the pre-balk cam 52 can rotate around the shaft portion of the rivet 60, and the rotation of the pre-boke cam 52 is regulated by the spring 59.

  Here, the operation of the gear noise prevention device for a manual transmission having the above-described configuration will be specifically described with reference to FIGS.

  First, when the shift lever 103 is operated to the neutral state, as shown in FIG. 3A, the forward shift gear finger 22 b is disposed in the engaging portion of the 3-4 speed shift lug 39. The reverse gear shift finger 23 a is disposed on the side of the reverse gear shift lug 43. As shown in FIG. 3B, the pre-boke pin 51 and the projection 56 of the pre-boke cam 52 are arranged apart from each other. A lower curved extending portion 55 of the pre-balk cam 52 is disposed adjacent to the protruding portion 41 of the 5-6 speed shift lug 40.

  Subsequently, when the shift lever 103 is operated to the 1st and 2nd gear select positions, the select operation rotating unit 22, the reverse gear rotating unit 23, and the prebalk rotating unit 25 are moved in the axial direction. As shown in FIG. 2, the forward shift gear 22b is disposed in the engaging portion of the first-second shift lug 38. The reverse gear shift finger 23 a is disposed adjacent to the reverse gear shift lug 43. As shown in FIG. 4B, the preboke pin 51 is disposed adjacent to the protrusion 56 of the preboke cam 52. A lower curved extending portion 55 of the pre-balk cam 52 is disposed adjacent to the protruding portion 41 of the 5-6 speed shift lug 40.

  Subsequently, when the shift lever 103 is operated to the reverse select position, the select operation rotation unit 22, the reverse rotation unit 23, and the prebake rotation unit 25 move in the axial direction, as shown in FIG. 5A. Further, the forward gear shift finger 22b is disposed adjacent to the engaging portion of the shift lug 38 for 1-2 speed. The reverse gear shift finger 23 a is disposed in the reverse gear shift lug 43. As shown in FIG. 5B, the pre-boke pin 51 comes into contact with and engages with the protrusion 56 of the pre-boke cam 52. As a result, the pre-balk cam 52 rotates around the rivet 60. Along with this rotation, the lower curved extending portion 55 of the pre-balk cam 52 comes into contact with the protruding portion 41 of the 5-6 speed shift lug 40, and the 5-6 speed shift lug 40 moves rearward (upward in FIG. 5A). Moving. As a result, the 5-6 speed shift rail 33 to which the 5-6 speed shift lug 40 is connected moves in the axial direction, and a specific forward gear synchronizer is operated by the shift fork 36. At this time, the gear selected by the synchronization device for a specific forward gear is fixed to the output shaft, and the input shaft rotating in inertia is linked to the output shaft that stops rotating simultaneously with the stop of the vehicle. Rotation is reduced or stopped.

  Subsequently, when the shift lever 103 is operated to the reverse shift position, the shift select shaft 21 rotates, and the preboke pin 51 moves above the protrusion 56 of the preboke cam 52 as shown in FIGS. 6B and 6C. To do. As a result, the engagement between the pre-boke pin 51 and the projection 56 is released, and the lower curved extension portion 55 of the pre-boke cam 52 is disposed adjacent to the protruding portion 41 of the shift lug 40 for 5-6 speed by the biasing force of the spring 59. Is done. That is, the pre-balk cam 52 is disposed at a position when the shift lever 103 is operated to the neutral position. Along with this, the positioning mechanism 70 moves the shift lane 33 in the axial direction, and the 5-6 speed shift lug 40 is disposed at the neutral position. On the other hand, as shown in FIG. 6A, the forward gear shift finger 22b is disposed adjacent to the engaging portion of the shift lug 38 for 1-2 speed. The reverse shift gear finger 23a moves to the lower side in the figure while being arranged in the reverse gear shift lug 43. As a result, the reverse shift fork 37 is rotated, the reverse gear is engaged, and the power of the input shaft is transmitted to the output shaft in a reverse rotation with respect to the rotation direction of the input shaft. Then, power is transmitted to the drive wheels of the vehicle via an output shaft, a differential device, and the like.

  Subsequently, when the shift lever 103 is operated to the reverse shift removal position (reverse select position), the shift select shaft 21 rotates and, as shown in FIG. 7A, the reverse gear shift finger 23a is used for the forward gear. It arrange | positions in the position along with the shift lugs 38,39,40. Further, since the shift select shaft 21 rotates, the preboke pin 51 moves to a position adjacent to the projection 56 of the preboke cam 52, as shown in FIGS. 7B and 7C.

  Subsequently, when the shift lever 103 is operated to the 1st and 2nd gear select positions, the select operation rotating section 22, the reverse stage rotating section 23, and the pre-balk rotating section 25 are moved in the axial direction. As shown in FIG. 2, the forward shift gear 22b is disposed in the engaging portion of the first-second shift lug 38. The reverse gear shift finger 23 a is disposed adjacent to the reverse gear shift lug 43. Further, since the select operation turning section 22, the reverse stage turning section 23, and the prebake turning section 25 are moved in the axial direction, the preboke pin 51 is a protrusion of the preboke cam 52 as shown in FIGS. 8B and 8C. It moves in contact with 56 and is arranged at a position adjacent to the protrusion 56. That is, the pre-boke pin 51 is disposed at the same position as when the shift lever 103 is operated from the neutral position to the 1st-and 2-speed select position.

  Therefore, with the above-described configuration, when the shift lever 103 is operated to the reverse select position, the 5-6 speed shift rail 33 moves in the axial direction, and the shift fork 36 activates the synchronization device for a specific forward gear. To do. At this time, the gear selected by the synchronization device for a specific forward gear is fixed to the output shaft, and the input shaft that is rotating in inertia is linked to the output shaft that stops rotating simultaneously with the stop of the vehicle, and the input shaft Rotation is reduced or stopped. Such a state is maintained until the shift lever 103 is operated to the reverse shift position. That is, when shifting to the reverse gear, the forward gear synchronizer can be operated until the selection operation is completed. Thereby, sufficient operation time and sufficient operation amount can be ensured, and gear ringing can be prevented more reliably.

  The gear squeezing prevention device for a manual transmission according to the present invention can operate a forward gear synchronizer until a select operation is completed when shifting to a reverse gear, and has a sufficient operating time and a sufficient operating amount. It is possible to ensure the prevention of gear noise more reliably and can be used extremely beneficially in the automobile industry.

DESCRIPTION OF SYMBOLS 1 Transmission case 3 Select lever 6 Engagement part 7 Shift lever 10 Engagement part 21 Shift select shaft 22 Select operation rotation part 22b Forward shift gear 23 Reverse gear rotation part 23a Reverse shift gear 24 Rotating part for shift operation 25 Rotating part for pre-balk cam 26 Coil springs 31 to 33 Shift rails 34 to 37 Shift fork 38 to 40 Shift lug 41 Projecting part 42 Inclined surface part 43 Shift lug 51 Pre-boke pin 52 Pre-boke cam 56 Projecting part 59 Spring 70 Positioning mechanism 83-85 engaging pin 100 shift lane 101a-101d shift path 102 select path 103 shift lever

Claims (4)

A shift select shaft that performs a select operation that moves in the axial direction during a shift operation and a shift operation that rotates about the shaft, a forward shift lug linked to the shift select shaft, and a shift rail for the forward shift lug A forward shift fork for performing a shift operation to a predetermined forward stage while operating a synchronizer in accordance with the shift operation of the shift select shaft, and a reverse shift lug linked to the shift select shaft And a reverse gear shift fork that is connected to the reverse gear shift lug via a shift rail and performs a shift operation to the reverse gear in accordance with the shift operation of the shift select shaft.
A first rotating portion that moves in the axial direction along the shift select shaft during a select operation toward the reverse stage of the shift select shaft;
A pre-balk cam that rotates in response to an axial movement force of the first rotation part;
The shift gear for the forward gear is provided in the shift lug for the forward gear, and receives the rotational force of the pre-balk cam and moves the shift rail for the forward gear in the direction along the axis, so that during the select operation toward the reverse gear of the shift select shaft, A protrusion for operating the synchronization device;
A protrusion extending toward the shift select shaft is provided on the pre-balk cam,
A gear squeezing prevention device for a manual transmission, wherein a pre-boke pin extending toward the pre-balk cam and engageable with the protrusion is provided in the first rotating part. A gear noise prevention device for a manual transmission according to claim 1,
An apparatus for preventing gear squealing in a manual transmission, wherein an engagement portion that can be engaged with the protrusion provided on the forward shift lug is provided on the pre-boke cam. A gear noise prevention device for a manual transmission according to claim 1,
The pre-balk cam is rotatably connected to a pre-balk cam bracket fixed to the transmission case by a connector,
A gear squeezing prevention device for a manual transmission, wherein the pre-balk cam, the pre-balk cam bracket, and the connector are wound by a spring. A gear noise prevention device for a manual transmission according to claim 1,
A second rotating portion provided on the shift select shaft, to which a select operation of the shift lever is transmitted;
A gear squeezing prevention device for a manual transmission, wherein a spring is wound around the first rotating part and the second rotating part.

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