WO2015189885A1

WO2015189885A1 - Transmission

Info

Publication number: WO2015189885A1
Application number: PCT/JP2014/065191
Authority: WO
Inventors: 舞斗日置; 隆充伊藤
Original assignee: アイシン・エーアイ株式会社
Priority date: 2014-06-09
Filing date: 2014-06-09
Publication date: 2015-12-17
Also published as: JPWO2015189885A1

Abstract

Provided is a manual transmission in which mounted is a pre-balk mechanism and which enables a synchronizer mechanism to be improved in durability. The manual transmission includes: a pre-balk lever (35) provided on a shift select shaft (21); a pre-balk member (60) which is mounted on a first shift head (41) and of which top is kept in contact with the pre-balk lever (35), the pre-balk member (60) being pressed by the pre-balk lever (35) as the shift select shaft (21) is rotated when Reverse is established and pre-displacing the first shift head (41) so as to allow a first synchronous coupling mechanism (210) to stop an input shaft (131) in synchronism with an output shaft (132) which has stopped rotating; a lock part (35g) of the pre-balk lever (35) provided on the shift select shaft (21); and an engagement part (41f) which is provided on the first shift head (41) and which is engaged with the lock part (35g), when Reverse is established, so as to prevent the pre-displacement of the first shift head (41).

Description

Transmission

The present invention relates to a manual transmission mounted on a vehicle.

In a manual transmission, it is common that a synchronizer mechanism is not provided in the gear constituting the reverse, from the viewpoint of cost and suppression of the axial dimension of the transmission. When reverse is formed, the clutch is disengaged, but the input shaft rotates due to the inertia of the input shaft and members attached to the input shaft. For this reason, since the rotation difference between the rotating input shaft and the stopped output shaft cannot be synchronized by the synchronizer mechanism, a gear squeal may occur when configuring reverse.

Therefore, as shown in Patent Document 1, a manual transmission equipped with a pre-boke mechanism has been proposed. This pre-boke mechanism synchronizes with the output shaft that stopped the rotation of the input shaft by operating the synchronizer mechanism of the other shift stage at the time of reverse formation, that is, the input shaft is stopped and the reverse shaft is This prevents the squealing of the gear.

In the manual transmission, an interlock plate is provided to prevent double gears from being formed. The interlock plate engages with a shift head other than the selected shift head to prevent the shift head from moving in the shift direction. In order to operate the synchronizer mechanism when the preboke mechanism is operated, a notch is formed in the interlock plate so that the shift head connected to the synchronizer mechanism can move in the shift direction.

JP 2009-68551 A

As described above, since the notch is formed in the interlock plate, the shift head may move in the shift direction when the vehicle moves backward after the reverse formation is completed, and the synchronizer mechanism operates. There is a possibility that. For this reason, there existed a problem that durability of a synchronizer mechanism will fall.

The present invention has been made in view of such circumstances, and provides a manual transmission capable of improving the durability of a synchronizer mechanism in a manual transmission having a pre-boke mechanism. With the goal.

In order to solve the above-described problem, the invention of the transmission according to claim 1 includes an input shaft provided with a plurality of drive gears and a reverse drive gear, and a plurality of driven gears respectively meshed with the plurality of drive gears. And an output shaft provided with a reverse driven gear, a reverse idler gear meshing with the reverse drive gear and the reverse driven gear, one of the drive gear and the driven gear meshing with each other, and one of these gears provided so as to be free to rotate. A plurality of synchronous coupling mechanisms that are coupled after synchronizing one of the input shaft and the output shaft, the reverse drive gear, the reverse idler gear, and the reverse driven gear, and the input shaft and the A reverse forming mechanism for rotating and connecting the output shaft to form a reverse; A plurality of forks respectively coupled to the plurality of synchronous coupling mechanisms and the reverse forming mechanism, a shift select shaft provided to be movable in the axial direction and rotatable with respect to the axial direction, and orthogonal to the axial direction A plurality of shift heads movably provided in a direction; a plurality of fork shafts respectively connecting the plurality of forks and the plurality of shift heads; and the shaft of the shift select shaft provided on the shift select shaft. The shift head is selectively engaged with one of the plurality of shift heads as the direction moves, and the shift head engaged with the rotation of the shift select shaft is moved to move the fork. An inner lever for operating the synchronous coupling mechanism or the reverse forming mechanism via the shift select, It is attached to the fork shaft other than the fork shaft to which the pre-boke lever provided in the shaft and the fork connected to the reverse forming mechanism are connected, or the shift head connected to the fork shaft, When the tip contacts the pre-boke lever and the reverse is formed by the reverse forming mechanism, the fork shaft or the shift head is pushed by the pre-boke lever as the shift select shaft rotates. A pre-boke member that is pre-moved to stop the input shaft in synchronization with the output shaft whose rotation is stopped by the synchronous coupling mechanism; and the shift head other than the shift head engaged with the inner lever; When engaged to prevent the shift head from moving Both are provided on an interlock member that allows the pre-movement of the shift head by the pre-boke member, a lock portion provided on the shift select shaft, and the fork shaft or the shift head provided with the pre-boke member. And an engaging portion that engages with the lock portion and prevents the pre-movement of the fork shaft or the shift head when the reverse is formed.

Thus, when the reverse is formed, the lock portion and the engagement portion are engaged, and the pre-movement of the fork shaft or shift head provided with the pre-boke member is prevented. For this reason, the synchronization of the input shaft and the output shaft by the synchronizer mechanism of the synchronous coupling mechanism is prevented, and the durability of the synchronizer mechanism is improved.

According to a second aspect of the present invention, in the first aspect of the present invention, the lock portion is formed with a contact surface, and the engagement portion is formed with a contact surface that contacts the contact surface. Has been. Thereby, at the time of reverse formation, since the contact surface and the non-contact surface are in surface contact, the pre-movement of the fork shaft or shift head provided with the pre-boke member is reliably prevented.

The invention according to claim 3 is the invention according to claim 1, wherein the lock portion is provided separately from the pre-boke member. Thereby, the width dimension of the pre-boke lever in the select direction is not increased, and the cost for processing the lock portion is reduced.

It is a skeleton figure of the transmission of this embodiment. It is an axial direction sectional view of a synchronous connection mechanism. It is a fragmentary sectional view of a shift operation device. FIG. 4 is a cross-sectional view taken along the line II of FIG. 3 and shows a state where an inner lever is engaged with a second shift head. FIG. 4 is a cross-sectional view taken along the line II-II of FIG. FIG. 6 is a cross-sectional view taken along the line III-III in FIG. 5, showing a state in which the pre-boke lever is in the neutral position in the select direction, and a cross-sectional view of the pre-boke lever and the bre-boke mechanism. FIG. 6 is a cross-sectional view taken along the line III-III in FIG. 5, showing a state in which the pre-boke lever is on the select direction high side, and is a cross-sectional view of the pre-boke lever and the bre-boke mechanism. FIG. 4 is a cross-sectional view taken along the line II of FIG. 3 and shows a state where an inner lever is engaged with a third shift head. FIG. 4 is a cross-sectional view taken along the line II-II of FIG. 3 in a state where a reverse is formed. FIG. 4 is a cross-sectional view taken along the line II-II in FIG. 3 in the transmission according to the second embodiment.

(Description of transmission)
Below, the transmission 1000 of this embodiment is demonstrated. The transmission 1000 is a manual type device that decelerates rotational torque input from an engine or motor at different reduction ratios and outputs the rotational torque to a differential rotationally connected to a driving wheel of the vehicle.

As shown in FIG. 1, the transmission 1000 mainly includes an input shaft 131, an output shaft 132, a reverse shaft 133, a first drive gear 141 to a fifth drive gear 145, a reverse drive gear 146, a first driven gear 151 to a first drive gear. It has a five driven gear 155, a reverse driven gear 156, an output gear 157, a reverse idler gear 161, a first synchronous connecting mechanism 210, a second synchronous connecting mechanism 220, a third synchronous connecting mechanism 230, and a shift operating device 100 (shown in FIG. 3).

The input shaft 131 is a shaft through which rotational torque from the engine or motor is input via a clutch. The output shaft 132 is a shaft that differentially outputs the rotational torque input to the transmission 1000, and is disposed in parallel with the input shaft 131. Each of the input shaft 131 and the output shaft 132 is rotatably supported by the housing.

The first drive gear 141, the second drive gear 142, and the reverse drive gear 146 are fixed gears that are fixed to the input shaft 131 so as not to rotate relative to each other. The third drive gear 143, the fourth drive gear 144, the fifth drive gear 145, and an idler gear provided on the input shaft 131 so as to be rotatable relative to the input shaft 131.

The first driven gear 151 and the second driven gear 152 are idle gears attached to the output shaft 132 so as to be relatively rotatable (freely rotatable). The third driven gear 153, the fourth driven gear 154, the fifth driven gear 155, the reverse driven gear 156, and the output gear 157 are fixed gears fixed to the output shaft 132 so as not to be relatively rotatable.

The first drive gear 141 and the first driven gear 151 are gears that mesh with each other and constitute the first speed. The second drive gear 142 and the second driven gear 152 are gears that mesh with each other to form the second speed. The third drive gear 143 and the third driven gear 153 are gears that mesh with each other and constitute the third speed. The fourth drive gear 144 and the fourth driven gear 154 mesh with each other and constitute the fourth speed. The fifth drive gear 145 and the fifth driven gear 155 mesh with each other and constitute a fifth speed.

The gear diameter increases in the order of the first drive gear 141, the second drive gear 142, the third drive gear 143, the fourth drive gear 144, and the fifth drive gear 145. The first driven gear 151, the second driven gear 152, the third driven gear 153, the fourth driven gear 154, and the fifth driven gear 155 have smaller gear diameters in this order.

The reverse shaft 133 is provided in parallel with the input shaft 131 and the output shaft 132. The reverse idler gear 161 is provided on the reverse shaft 133 so as to be slidable in the axial direction. The reverse idler gear 161 meshes with both the reverse drive gear 146 and the reverse driven gear 156 or does not mesh with both the reverse drive gear 146 and the reverse driven gear 156 depending on the position in the axial direction with respect to the reverse shaft 133. As described above, the reverse idler gear 161 is configured to be slidable in the axial direction, and the input shaft 131 and the output shaft 132 are rotationally connected via the reverse drive gear 146, the reverse idler gear 161, and the reverse driven gear 156. The reverse formation mechanism which forms is comprised.

The output gear 157 meshes with the differential ring gear, and outputs the rotational torque input to the output shaft 132 to the differential rotationally connected to the drive wheels.

(Selection mechanism)
[First selection mechanism]
The first synchronous coupling mechanism 210 selects the first driven gear 151 or the second driven gear 152, synchronizes the selected gear with the output shaft 132, and couples the selected gear to the output shaft 132 so as not to be relatively rotatable. As shown in FIGS. 1 and 2, the first synchronous coupling mechanism 210 includes a first hub H1, a first speed engagement member E1, a second speed engagement member E2, a first synchronizer ring R1, and a second. It consists of a synchronizer ring R2 and a first sleeve S1. The first hub H <b> 1 is splined to the output shaft 132 between the first driven gear 151 and the second driven gear 152 in the axial direction. The first speed engagement member E1 and the second speed engagement member E2 are members fixed to the first driven gear 151 and the second driven gear 152, for example, by press fitting. The first synchronizer ring R1 is interposed between the first hub H1 and the first speed engagement member E1. A cone surface R1-1 is formed on the inner periphery of the first synchronizer ring R1. A cone surface E1-1 is formed on the outer periphery of the first speed engagement member E1. The cone surface R1-1 and the cone surface E1-1 are opposed to each other.

The second synchronizer ring R2 is interposed between the first hub H1 and the second speed engagement member E2. The first sleeve S1 is spline engaged with the outer periphery of the first hub H1 so as to be movable in the axial direction. A cone surface R2-1 is formed on the inner periphery of the second synchronizer ring R2. A cone surface E2-1 is formed on the outer periphery of the second speed engagement member E2. The cone surface R2-1 and the cone surface E2-1 are opposed to each other.

The first sleeve S1 of the first synchronous coupling mechanism 210 is not engaged with either the first speed engagement member E1 or the second speed engagement member E2 in the “neutral position” shown in FIG. An annular first engagement groove S1-1 is formed on the outer periphery of the first sleeve S1. A first fork F1 (shown in FIGS. 1 and 3) is engaged with the first engagement groove S1-1.

When the first sleeve S1 is shifted to the first driven gear 151 side by the first fork F1, the first sleeve S1 is spline-engaged with the first synchronizer ring R1, and the cone surface R1-1 and the cone surface E1-1 are connected. By contacting, the rotation of the output shaft 132 and the first driven gear 151 is synchronized, and then the first sleeve S1 is engaged with the external spline on the outer periphery of the first speed engagement member E1, and the first driven gear 151 is engaged with the output shaft. The first gear is formed by being connected to the non-rotatable portion 132. Further, if the first sleeve S1 is shifted to the second driven gear 152 side by the first fork F1, the second synchronizer ring R2 similarly synchronizes the rotation of the output shaft 132 and the second driven gear 152, and then the output shaft 132 and the second driven gear 152 are connected so as not to rotate relative to each other, thereby forming the second speed.

Thus, the synchronizer mechanism that synchronizes the rotation of the first driven gear 151 or the second driven gear 152 and the output shaft 132 includes the first synchronizer ring R1, the second synchronizer ring R2, the first speed engagement member E1, and the second speed. It is comprised from the engaging member E2.

[Second selection mechanism]
The second synchronous coupling mechanism 220 selects the third drive gear 143 or the fourth drive gear 144, synchronizes the selected gear with the input shaft 131, and couples the selected gear to the input shaft 131 so as not to be relatively rotatable. is there. The second synchronous coupling mechanism 220 includes a second hub H2, a third speed engagement member E3, a fourth speed engagement member E4, a third synchronizer ring R3, a fourth synchronizer ring R4, and a second sleeve S2. It is composed of

The second synchronization coupling mechanism 220 has the same configuration as the first synchronization coupling mechanism 210, and the second hub H2 is fixed to the input shaft 131 between the third drive gear 143 and the fourth drive gear 144, and the third The only difference is that the speed engagement member E3 and the fourth speed engagement member E4 are fixed to the third drive gear 143 and the fourth drive gear 144, respectively. The second synchronous coupling mechanism 220 is not engaged with any of the engagement members E3 and E4 in the “neutral position”. An annular second engagement groove S2-1 is formed on the outer periphery of the second sleeve S2. The second fork F2 is engaged with the second engagement groove S2-1.

If the second sleeve S2 is shifted to the third drive gear 143 by the second fork F2, the input shaft 131 and the third drive gear 143 are integrated after the rotation of the input shaft 131 and the third drive gear 143 is synchronized. To the third gear. If the second sleeve S2 is shifted toward the fourth drive gear 144 by the second fork F2, the input shaft 131 and the fourth drive gear 144 are synchronized after the rotation of the input shaft 131 and the fourth drive gear 144 is synchronized. Are connected to form the fourth speed.

[Third selection mechanism]
The third synchronous coupling mechanism 230 is configured to synchronize the fifth drive gear 145 with the input shaft 131 and connect the fifth drive gear 145 to the input shaft 131 so as not to be relatively rotatable. The third synchronous coupling mechanism 230 includes a third hub H3, a fifth speed engagement member E5, a fifth synchronizer ring R5, and a third sleeve S3.

The third synchronization coupling mechanism 230 has the same configuration as the first synchronization coupling mechanism 210, and the third hub H3 is fixed to the input shaft 131 on the side of the fifth drive gear 145, and the fifth speed engagement member E5. Is different from the fifth drive gear 145 in that it is fixed to the fifth drive gear 145. The third synchronization coupling mechanism 230 is not engaged with the engagement member E5 in the “neutral position”. An annular third engagement groove S3-1 is formed on the outer periphery of the third sleeve S3. The third fork F3 is engaged with the third engagement groove S3-1.

If the third sleeve S3 is shifted to the fifth drive gear 145 side by the third fork F3, the input shaft 131 and the fifth drive gear 145 are integrated after the rotation of the input shaft 131 and the fifth drive gear 145 is synchronized. Are connected to form the fifth gear.

(Structure of shift operation device)
Next, the shift operation device 100 according to the present embodiment will be described with reference to FIGS. As shown in FIGS. 3 to 8, the shift operating device 100 mainly includes a housing 11, a shift select shaft 21, a connecting member 22, an input member 23, a high side select spring 24, a low side select spring 25, and an inner lever 31. , Gate member 32, gate pin 33, interlock member 34, pre-boke lever 35, first shift head 41 to third shift head 43, first fork shaft 51 to third fork shaft 53, and pre-boke member 60. .

The housing 11 also serves as the housing of the transmission 1000 in this embodiment. The shift select shaft 21 is provided in the housing 11 so as to be movable in the select direction and rotatable in the select direction. The select direction is the axial direction (longitudinal direction) of the shift select shaft 21, and is the left-right direction on the paper surface in FIG. In the following description, the rotation direction is the rotation direction of the shift select shaft 21. The shift direction is a direction orthogonal to the select direction. In the following description, in FIG. 3, the right side of the paper is the select direction low side, the left side of the paper is the select direction high side, the upper side of the paper is the upper side, and the lower side of the paper is the lower side.

A connecting member 22 is attached to one end of the shift select shaft 21. An input member 23 is attached to the connecting member 22. The input member 23 is connected to a shift lever (not shown) and a connecting member such as a wire. When the shift lever is operated in the lateral direction (selection direction of the shift lever), the shift select shaft 21 moves in the select direction. When the shift lever is operated in the vertical direction (shift direction of the shift lever), the shift select shaft 21 rotates in the rotation direction.

The first shift head 41 to the third shift head 43 are provided in the housing 11 so as to be movable in the shift direction in parallel with the select direction. As shown in FIG. 4, in this embodiment, a first shift head 41, a second shift head 42, and a third shift head 43 are provided in order from the low side to the high side in the select direction. The first shift head 41 is for first speed and second speed. The second shift head 42 is for the third speed and the fourth speed. The third shift head 43 is for the fifth speed and reverse.

As shown in FIG. 4, engaging recesses 41a to 43a each having a width in the shift direction and communicating in the select direction are formed in the leading ends of the first shift head 41 to the third shift head 43, respectively. As shown in FIG. 4, when each of the first shift head 41 to the third shift head 43 is in a neutral position that is in the middle of the movement range in the shift direction, the position in the shift direction of each of the engagement recesses 41a to 43a is It matches.

As shown in FIG. 3, the inner lever 31 is fixed to an intermediate portion of the shift select shaft 21 in the select direction. The inner lever 31 is formed with an engaging portion 31 a that protrudes away from the shift select shaft 21. As shown in FIG. 4, the width dimension of the engaging part 31a in the shift direction is smaller than the width dimension of the engaging concave parts 41a to 43a. For this reason, when each of the first shift head 41 to the third shift head 43 is in the neutral position, the engaging portion 31a is moved in the select direction by the movement of the shift select shaft 21 in the select direction. It selectively engages with any of the engagement recesses 41a to 43a of the head 41 to the shift head 43.

When the inner lever 31 is rotated by the rotation of the shift select shaft 21, it moves any of the first shift head 41 to the third shift head 43 engaged with the engaging portion 31a in the shift direction.

The interlock member 34 is a double meshing prevention device, and is a member that prevents the shift heads 41 to 43 other than the shift heads 41 to 43 engaged with the inner lever 31 from moving in the shift direction. The interlock member 34 is attached to the outer peripheral side of the shift select shaft 21 so as to be rotatable with respect to the shift select shaft 21 so as to cover the inner lever 31. For this reason, the inner lever 31 is rotatable in the rotation direction with respect to the interlock member 34.

The upper part of the interlock member 34 is formed with a restriction hole 34b that is long in the select direction. The leading end of the rotation restricting member 26 attached to the housing 11 is inserted into the restricting hole 34b. With this configuration, the interlock member 34 cannot rotate with respect to the housing 11 and can move in the select direction.

As shown in FIG. 3, the inner side of the interlock member 34 is in contact with both ends of the inner lever 31 in the select direction. For this reason, when the shift select shaft 21 is moved in the select direction, both the inner lever 31 and the interlock member 34 are moved in the select direction.

As shown in FIG. 3, an interlock plate 34p is formed below the interlock member 34. As shown in FIG. 4, the interlock plate 34p is formed with a passage hole 34a having a predetermined width in the select direction and communicating in the shift direction. The engaging portion 31a of the inner lever 31 has entered the passage hole 34a. The width dimension of the interlock plate 34p in the shift direction is smaller than the width dimension of the engaging recesses 41a to 43a in the shift direction. For this reason, the interlock plate 34p can enter each of the engaging recesses 41a to 43a.

The width dimension in the select direction of the passage hole 34a is larger than the width dimension in the select direction of each of the first shift head 41 to the third shift head 43. For this reason, the first shift head 41 to the third shift head 43 whose positions in the select direction match the passage holes 34a are movable in the shift direction. On the other hand, the first shift head 41 to the third shift head 43 whose position in the select direction does not match the passage hole 34a cannot move in the shift direction.

As shown in FIG. 4, in a state where the engaging portion 31a is engaged with the second engaging concave portion 42a, the interlock plate 34p is engaged with the first engaging concave portion 41a and the third engaging concave portion 43a. ing. For this reason, movement of the first shift head 41 and the third shift head 43 in the shift direction is prevented. On the other hand, since the second engagement recess 42a is not engaged with the interlock plate 34p, the second shift head 42 is allowed to move in the shift direction.

As shown in FIG. 7, in the state where the engaging portion 31a of the inner lever 31 is engaged with the third shift head 43, the interlock facing the low side in the shift direction of the engaging recess 41a of the first shift head 41a. The plate 34p is formed with a notch 34c. That is, a gap is formed between the engagement recess 41a of the first shift head 41a on the low side in the shift direction and the interlock plate 34p facing it. For this reason, the first shift head 41 moves to the high side in the shift direction, that is, the second speed side by a predetermined pre-movement distance in a state where the engaging portion 31a of the inner lever 31 is engaged with the third shift head 43. It is possible. This notch 34c is for operating the pre-boke by the pre-boke member 60 described later.

The gate member 32 is fixed to the shift select shaft 21 adjacent to the interlock member 34. The gate member 32 is formed with a plate-like gate portion 32a. A gate groove 32b that matches the shift gate pattern of the shift lever is formed in the gate portion 32a. The gate pin 33 is fixed to the housing 11 and is engaged with the gate groove 32b. Such a configuration prevents the shift select shaft 21 from rattling in the select direction after shifting.

The pre-boke lever 35 is attached to the shift select shaft 21 adjacent to the interlock member 34 on the side opposite to the gate member 32. The pre-boke lever 35 will be described in detail later.

A high-side select spring 24 is attached to the outer periphery of the shift select shaft 21 on the high side in the select direction with respect to the gate member 32. The end of the high side select spring 24 on the low side in the select direction is in contact with the gate member 32. A low-side select spring 25 is attached to the outer periphery of the shift select shaft 21 on the low side in the select direction relative to the pre-boke lever 35. The end portion on the high side in the select direction of the low side select spring 25 is in contact with the pre-boke lever 35. By these high-side select spring 24 and low-side select spring 25, the shift select shaft 21 is centered at the center position of the select moving range.

As shown in FIG. 1, the fork shafts 51 to 53 are provided in parallel with each other so that the axial direction thereof is movable in the axial direction in the same direction as the axial direction (shift direction) of the input shaft 131 and the output shaft 132. Yes.

The first fork shaft 51 connects the first fork F1 and the first shift head 41. That is, the first shift head 41 is connected to the first fork F <b> 1 via the first fork shaft 51. The second fork shaft 52 connects the second fork F <b> 2 and the second shift head 42. That is, the second fork F <b> 2 is connected to the second shift head 42 via the second fork shaft 52. The third fork shaft 53 connects the third fork F3, the fourth fork F4, and the third shift head 43. In other words, the third shift head 43 is connected to the third fork F3 and the fourth fork F4 via the third fork shaft 53.

The fourth fork F4 is connected to the reverse idler gear 161. When the third fork shaft 53 is moved to the shift direction high side, the fourth fork F4 is also moved to the shift direction high side. Then, the reverse idler gear 161 is also moved to the shift direction high side, and a reverse in which the reverse idler gear 161 meshes with both the reverse drive gear 146 and the reverse driven gear 156 is formed.

(Preboke mechanism)
As shown in FIGS. 3 and 5, the first shift head 41 is provided with a preboke member 60. As shown in FIG. 5, the preboke member 60 includes a body 61, a preboke pin 62, and a spring 63. The body 61 is fixed to the first shift head 41. The front end of the pre-boke pin 62 protrudes from the body 61 and is slidably provided on the body 61. With such a configuration, the tip of the pre-boke pin 62 can be close to or separated from the shift select shaft 21. The spring 63 is housed inside the body 61 and urges the pre-boke pin 62 in a direction in which the tip thereof approaches the shift select shaft 21.

Hereinafter, the pre-boke lever 35 will be described with reference to FIG. In FIG. 5, the right side of the paper surface is the shift direction low side, the left side of the paper surface is the shift direction high side, the upper side of the paper surface is the upper side, and the lower side of the paper surface is the lower side. FIG. 5 is a view showing a state in which the inner lever 31 is at the neutral position in the shift direction. The pre-boke lever 35 includes a main body portion 35a, a protruding portion 35b, and a lock portion 35g. The main body 35a has a cylindrical shape, and an insertion hole 35c is formed at the center thereof. The shift select shaft 21 is inserted through the insertion hole 35c. The protruding portion 35b protrudes downward from the main body portion 35a, that is, toward the pre-boke pin 62 side. The protruding portion 35 b is in contact with the pre-boke pin 62 at the tip of the pre-boke member 60.

A first inclined surface 35d is formed on the shift direction high side of the lower portion (tip portion) of the protruding portion 35b. The first inclined surface 35b is inclined so as to be positioned on the low side in the shift direction as it is positioned below. A second inclined surface 35e is formed on the low side in the shift direction of the lower portion (tip portion) of the protruding portion 35b. The second inclined surface 35e is inclined so as to be positioned on the high side in the shift direction as it is positioned below. A vertex surface 35f, which is a horizontal surface, is formed between the first inclined surface 35d and the second inclined surface 35e at the lower end of the protruding portion 35b.

The portion where the shift select shaft 21 is inserted into the insertion hole 35c is a thin shaft portion 21a having a sectional fan shape. A first surface 21b and a second surface 21c are formed on the thin shaft portion 21a. The first surface 21b extends in the radial direction from the arc center 21e of the thin shaft portion 21a. The second surface 21c extends in the radial direction from the arc center 21e of the thin shaft portion 21a at a specified angle θ counterclockwise from the first surface 21b.

The pre-boke lever 35 is provided with a pin 36 along the shift direction so as to cross the inside of the insertion hole 35c. In a state where the inner lever 31 is in the neutral position in the shift direction, the first surface 21 b is in contact with the pin 36. The pin 36 prevents the pre-boke lever 35 from rotating clockwise. On the other hand, the counterclockwise rotation of the pre-boke lever 35 is allowed until the second surface 21 c comes into contact with the pin 36. A spring 37 that urges the pre-boke lever 35 counterclockwise with respect to the shift select shaft 21 is provided.

In the state where the inner lever 31 is engaged with the first shift head 41 and the second shift head 42, as shown in FIG. 6A, the positions of the pre-boke pin 62 and the pre-boke lever 35 in the select direction do not match. On the other hand, in the state where the inner lever 31 is engaged with the third shift head 43, the positions of the pre-boke pin 62 and the pre-boke lever 35 in the select direction coincide with each other as shown in FIG. 6B. When the inner lever 31 is in the shift direction neutral state, the tip of the pre-boke pin 62 is in contact with the first inclined surface 35 d of the pre-boke lever 35 as shown in FIG.

The lock part 35g is formed so as to protrude from the main body part 35a to the shift direction low side. The lock portion 35g is formed adjacent to the protruding portion 35b on the high side in the select direction. In a state where the inner lever 31 is engaged with the third shift head 53, the lock portion 35g is located at the same position as the first shift head 41 in the select direction. A first contact surface 35h is formed on the side surface below the lock portion 35g, and is inclined so as to be positioned upward as it is positioned on the tip side (shift direction low side) of the lock portion 35g. A second abutting surface 35i is formed at the distal end portion of the lock portion 35g, and is inclined so as to be positioned upward as it is positioned on the distal end side (shift direction low side) of the lock portion 35g. The first contact surface 35h and the second contact surface 35i are formed continuously. The second abutting surface 35i is formed with an inclination angle that is located on the upper side of the first abutting surface 35h as it is located on the distal end side of the lock portion 35g.

The first shift head 41 has an engagement portion 41f. The engaging portion 41f is formed to protrude upward from the upper portion of the shift head 41 so as to face the lock portion 35g. A first abutted surface 41g and a second abutted surface 41h are formed on the upper portion of the engaging portion 41f. The first contacted surface 41g is a substantially horizontal surface. The second abutted surface 41h is formed continuously with the first abutted surface 41g on the lower side in the shift direction than the first abutted surface 41g. The second abutted surface 41h is inclined so as to be positioned on the upper side as it is positioned on the shift direction low side.

When the vehicle is stopped and the clutch is disengaged before the reverse is formed, the input shaft 131 is rotated by the inertia of the input shaft 131 and the parts attached to the input shaft 131. Below, the preboke which stops the input shaft 131 at the time of reverse formation is demonstrated. When the inner lever 31 is engaged with the third shift head 43 by moving the shift lever to the select direction reverse side of the shift lever to form the reverse (shown in FIG. 7), as shown in FIG. 6B. Further, the positions of the pre-boke pin 62 and the pre-boke lever 35 in the select direction coincide with each other.

Next, when the driver moves the shift lever to the shift direction reverse side of the shift lever, the shift select shaft 21 rotates in the clockwise direction and the pre-boke lever 35 rotates in the clockwise direction. Then, the first inclined surface 35d of the pre-boke lever 35 presses the pre-boke pin 62, the bre-boke member 60 is moved to the shift direction high side, and the first shift head 41 to which the pre-boke member 60 is attached moves to the shift direction high side. The first fork shaft 51 is moved to the shift direction high side. Then, the first fork F1 is pre-moved to the shift direction high side, that is, the second speed side, the cone surface R2-1 (shown in FIG. 2) of the second synchronizer ring R2, and the cone of the second speed engagement member E2. The surface E2-1 comes into contact with each other, and the rotation of the output shaft 132 and the second driven gear 152 is synchronized. Since the vehicle is stopped, the rotation of the output shaft 132 is stopped. Further, since the second driven gear 152 is rotationally connected to the input shaft 131 via the second drive gear 142 meshed therewith, the rotation of the input shaft 131 is stopped.

When the driver further moves the shift lever toward the reverse side of the shift direction of the shift lever and the tip of the preboke pin 62 gets over the apex surface 35f and comes into contact with the second inclined surface 35e as shown in FIG. The second inclined surface 35e presses the tip of the pre-boke pin 62, and the pre-boke member 60 moves to the shift direction low side. Then, the first shift head 41, the first fork shaft 51, and the first fork F1 are returned to the shift direction low side, that is, the shift direction neutral position, and the cone surface R2-1 (see FIG. 2) of the second synchronizer ring R2 ) And the contact with the cone surface E2-1 of the second speed engagement member E2.

Then, the third fork shaft 53, the fourth fork F4, and the reverse idler gear 161 are moved to the shift direction high side, and the reverse idler gear 161 meshes with both the reverse drive gear 146 and the reverse driven gear 156 to form a reverse. Is done.

The lock 35g is rotated clockwise as the shift select shaft 21 rotates clockwise until the reverse is formed. When the reverse is formed, as shown in FIG. 8, the first contact surface 35h contacts the first contacted surface 41g, and the second contact surface 35i contacts the second contacted surface 41h. The lock portion 35g and the engaging portion 41f are brought into contact with each other. In this state, since the second contact surface 41h is in contact with the second contact surface 35i, the pre-movement of the first shift head 41 to the high side in the shift direction is prevented. Thus, when the vehicle is traveling in reverse, the cone surface R2-1 (shown in FIG. 2) of the second synchronizer ring R2 and the cone surface E2-1 of the second speed engagement member E2 may come into contact with each other. Is prevented.

(Effect of this embodiment)
As is apparent from the above description, when the reverse is formed, as shown in FIG. 8, the first shift in which the lock portion 35g and the engaging portion 41f are engaged and the pre-boke member 60 is provided. The pre-movement of the head 41 is prevented. For this reason, the synchronization of the input shaft 131 and the output shaft 132 by the synchronizer mechanism of the first synchronous coupling mechanism 210 is prevented, and the durability of the synchronizer mechanism is improved.

Further, a second contact surface 35i is formed on the lock portion 35g, and a second contact surface 41h that contacts the second contact surface 35i is formed on the engagement portion 41f. Thereby, at the time of reverse formation, since the contact surface and the non-contact surface are in surface contact, the pre-movement of the first shift head 41 provided with the pre-boke member 60 is reliably prevented.

(Second embodiment)
Below, the transmission 1000 of 2nd embodiment is demonstrated using FIG. 9 about a different point from embodiment described above (1st embodiment). In the transmission 1000 according to the second embodiment, the lock portion 35m is separate from the pre-boke lever 35. The lock portion 35m has a cylindrical shape, is attached to the protruding portion 35b of the pre-boke lever 35, and extends from the protruding portion 35b to the select direction high side.

An engaging recess 41m having a shape corresponding to the lower portion of the lock portion 35m is formed in the upper portion of the engaging portion 41f. When the reverse is formed, as shown in FIG. 9, the lock portion 35m engages with the engagement recess 41m. Then, the movement of the first shift head 41 to the high side in the shift direction is prevented.

In the second embodiment, the lock portion 35m and the pre-boke lever 35 are configured separately, and the lock portion 35m is attached to the protruding portion 35b of the pre-boke lever 35 and extended from the protruding portion 35b to the selection direction high side. Yes. Thereby, the width dimension in the select direction of the pre-boke lever 35 is not increased, and the cost for processing the lock portion 35g is reduced.

(Another embodiment)
In the embodiment described above, the engaging portion 41 f is provided in the first shift head 41. However, there is no problem even if the engaging portion 41f is an embodiment provided in the first fork shaft 51.

In the embodiment described above, the preboke member 60 is provided in the first shift head 41. However, the pre-boke member 60 may be an embodiment provided in the first fork shaft 51.

In the embodiment described above, the preboke member 60 is provided in the first shift head 41. However, the pre-boke member 60 may be provided on the second shift head 42 other than the third shift head 43 connected to the fourth fork F4 for forming the reverse. Alternatively, the preboke member 60 may be provided on the second fork shaft 52. In the case of these embodiments, the engaging portion 41f may be provided on the second fork shaft 52.

In the embodiment described above, the shift heads 41 to 43 and the fork shafts 51 to 53 are separate bodies. However, the shift heads 41 to 43 and the fork shafts 51 to 53 may be integrated.

DESCRIPTION OF SYMBOLS 21 ... Shift select shaft, 31 ... Inner lever, 34 ... Interlock member, 35 ... Pre-boke lever, 35g ... Lock part (1st embodiment), 35i ... Second contact surface (contact surface), 35m ... Lock Part (second embodiment), 51 ... first fork shaft, 41 ... first shift head, 41f ... engagement part, 41h ... second contacted surface (contacted surface), 42 ... second shift head, 43 ... Third shift head, 60 ... Pre-boke member, 131 ... Input shaft, 132 ... Output shaft, 133 ... Reverse shaft, 141 ... First drive gear, 142 ... Second drive gear, 143 ... Third drive gear, 144 ... Fourth drive gear, 145 ... fifth drive gear, 146 ... reverse drive gear, 151 ... first driven gear, 152 ... second driven gear, 153 ... third driven gear, 1 4 ... Fourth driven gear, 155 ... Fifth driven gear, 156 ... Reverse driven gear, 161 ... Reverse idler gear, 210 ... First synchronous connecting mechanism, 220 ... Second synchronous connecting mechanism, 230 ... Third synchronous connecting mechanism, 1000 ... Shifting Device, F1 ... first fork, F2 ... second fork, F3 ... third fork, F4 ... fourth fork

Claims

An input shaft provided with a plurality of drive gears and reverse drive gears;
An output shaft provided with a plurality of driven gears and reverse driven gears respectively meshed with the plurality of drive gears;
A reverse idler gear meshing with the reverse drive gear and the reverse driven gear;
A plurality of synchronous connection mechanisms that connect one of the drive gear and the driven gear that mesh with each other, and one of the input shaft and the output shaft that are provided so that the one gear is allowed to rotate freely;
A reverse formation mechanism that forms a reverse by rotationally connecting the input shaft and the output shaft via the reverse drive gear, the reverse idler gear, and the reverse driven gear;
A plurality of forks respectively coupled to the plurality of synchronous coupling mechanisms and the reverse forming mechanism;
A shift select shaft provided so as to be movable in the axial direction and rotatable relative to the axial direction;
A plurality of shift heads movably provided in a direction orthogonal to the axial direction;
A plurality of fork shafts respectively connecting the plurality of forks and the plurality of shift heads;
The shift select shaft is selectively engaged with one shift head among the plurality of shift heads as the shift select shaft moves in the axial direction, and is engaged with the rotation of the shift select shaft. An inner lever that moves the combined shift head to operate the synchronous connection mechanism or the reverse forming mechanism via the fork;
A pre-boke lever provided on the shift select shaft;
Attached to the fork shaft other than the fork shaft to which the fork connected to the reverse forming mechanism is connected or the shift head connected to the fork shaft, the tip abuts on the pre-boke lever, When the reverse is formed by the reverse forming mechanism, the reverse select lever is pressed by the pre-boke lever as the shift select shaft rotates, and the fork shaft or the shift head is pre-moved so that the synchronous connecting mechanism A pre-boke member for stopping the input shaft in synchronization with the output shaft whose rotation is stopped;
An interlock member that engages with the shift head other than the shift head engaged with the inner lever to prevent the shift head from moving, and allows the pre-movement of the shift head by the pre-boke member;
A lock provided on the shift select shaft;
When the reverse is formed on the fork shaft or the shift head provided with the pre-boke member, the pre-movement of the fork shaft or the shift head is engaged with the lock portion. And an engaging portion for blocking.
A contact surface is formed on the lock portion,
The transmission according to claim 1, wherein a contacted surface that contacts the contact surface is formed in the engagement portion.
The transmission according to claim 1, wherein the lock portion is provided separately from the pre-boke member.