JP2010048356A - Shift operation device of manual transmission - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manual transmission capable of preventing an enlargement, by preventing interference with a shift gear train, even if a control shaft long in the vertical direction is arranged. <P>SOLUTION: A control shaft 50 for attaining a desired shift stage by transmitting its movement to a shift fork mechanism by sliding in the axial direction and the rotational direction by interlocking with the movement of select operation and shift operation of a change lever, is arranged in the vertical direction in a transmission case 2. The control shaft is arranged so that a part of the control shaft 50 is positioned on the shaft side more than the outer peripheral end of two shift rears 24 and 25 by passing through between the two shift gears 24 and 25 supported by an output shaft 20. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

The present invention relates to a shift operation device for a manual transmission, and more particularly to an arrangement of a control shaft for transmitting a change lever selection operation and a shift operation to a shift fork mechanism.

2. Description of the Related Art Conventionally, in a manual transmission, there are a rod type and a cable type as methods for transmitting a change lever selection operation and a shift operation to a shift fork mechanism. In the case of the rod type, a control rod is generally connected to the lower part of the transmission, and a shift fork mechanism such as a shift fork or a shift fork shaft is disposed below the input shaft and the output shaft. On the other hand, in the case of the cable type, the control cable is connected to the upper part of the transmission, and the shift fork mechanism is also arranged above the input shaft and the output shaft. Designing such two types of transmissions uniquely increases the cost, so a structure that can be used while minimizing design changes is desired.

Patent Document 1 discloses a control shaft for transmitting the movement of the control cable to the shift fork mechanism so that the shift fork mechanism can be used with a cable type without almost modifying the rod type transmission located at the lower part of the transmission. Has been proposed which is arranged vertically from the top to the bottom of the transmission.

However, even if the control shaft is arranged in the vertical direction, the arrangement position is a problem because it is necessary to avoid interference with the transmission gear train. For example, there are a method in which a distance is set on the outer side in the radial direction of the gear from the transmission gear train, and a method in which the axial length of the control shaft is shortened. In the former case, since the radial distance between the control shaft and the transmission gear train becomes long, there is a disadvantage that the transmission becomes larger by that amount. In the latter case, since the support span of the control shaft is shortened, the sliding resistance is increased, and the shaft length of the control shaft is short, so that the transmission mechanism for transmitting motion from the control shaft to the shift fork mechanism becomes large. There are disadvantages.
Japanese Patent Laid-Open No. 2002-22008

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a transmission operating device for a manual transmission that can prevent interference with a transmission gear train and prevent an increase in size even if a control shaft that is long in the vertical direction is provided.

In order to achieve the above object, the present invention is provided with a first shaft to which power is input from an engine, a second shaft for outputting power to an axle, a lower portion of the first shaft and the second shaft, A shift fork mechanism for selecting one of a plurality of transmission gear trains provided in a transmission path of power transmitted from the first shaft to the second shaft, and interlocking with the movement of the select lever and the shift operation of the change lever. A control shaft that slides in the axial direction and the rotational direction and transmits the movement to the shift fork mechanism to achieve a desired gear stage, wherein the control shaft constitutes the transmission gear train Among the transmission gears to be moved, they are arranged in the vertical direction so as to pass between the two transmission gears supported on the same shaft, and a part of the control shaft is from the outer peripheral ends of the two transmission gears. Providing a shift operating device for a manual transmission, characterized in that it is arranged so as to be positioned on the shaft side which supports a serial transmission gear.

In the present invention, the control shaft is arranged in the vertical direction so as to pass between the axial directions of the transmission gears constituting the transmission gear train. In addition, since the control shaft is partly located on the shaft side from the outer peripheral end of the transmission gear, the control shaft protrudes to the outside while reliably preventing interference between the control shaft and the transmission gear train. Without increasing the size of the transmission.

Various speed change gear pairs are conceivable as the speed change gear pairs through which the control shaft of the present invention passes, but the speed change gear pairs are arranged so as to pass between two adjacent speed change gears not provided with a synchronizer. desirable. In the case of a manual transmission, a transmission gear having a synchronization device is provided on one of the first shaft and the second shaft, and a transmission gear having no synchronization device is provided on the other, and the transmission gears of both shafts are engaged with each other. Since the synchronization device protrudes to the outer peripheral side, it easily interferes with the control shaft. Therefore, by passing the control shaft between transmission gears that do not have a synchronization device, interference between the synchronization device and the control shaft can be prevented, the control shaft can be brought closer to the shaft, and the transmission can be downsized. In addition, as a transmission gear pair that does not have a synchronizer, for example, in the case of a manual transmission of forward 4th speed to 5th speed, there are a third speed gear and a fourth speed gear provided on the second shaft.

As described above, according to the present invention, since the control shaft is arranged in the vertical direction so as to pass between the two transmission gears, it can be arranged close to the side portion of the shaft, while using a long control shaft. Thus, interference with the transmission gear train can be prevented, and an increase in size of the transmission can be prevented. Therefore, the rod type transmission can be easily modified to a cable type with almost no change.

Embodiments of the present invention will be described below with reference to the drawings.

1 to 8 show a manual transmission according to an embodiment of the present invention, FIG. 1 is an overall cross-sectional view of the transmission, and FIG. 2 is a view of a transmission case with a front cover removed, as viewed from the rear side. 3 is a rear view of the transmission case with the front cover and the rear cover removed, FIG. 4 is a sectional view taken along line IV-IV in FIG. 2, FIG. 5 is a plan view of the transmission case, and FIG. 7 is a view showing a lower end portion of the control shaft, FIG. 8 is a view showing a connection portion of the select cable, and FIG. 9 is a cross-sectional view taken along the line IX-IX in FIG.

This transmission is an example of a laterally mounted FF manual transmission having five forward speeds and one reverse speed, and a rod type transmission is applied to a cable type transmission. As shown in FIG. 1, the transmission housing includes a front cover (clutch housing) 1, a transmission case 2, and a rear cover 3, and power is transmitted from the engine output shaft 4 to the input shaft 6 in the front cover 1. A dry type single-plate clutch 5 is intermittently arranged. In the case 2, the input shaft 6 and the output shaft 20 are supported in parallel. A first speed gear 7, a second speed gear 8, and a reverse gear 9 are integrally fixed to the front end side (engine side) of the input shaft 6, and the third speed gear 10 and the fourth speed gear 11 are fixed to the rear end side. And are rotatably supported. A 3-4 speed switching synchronizer 12 is provided between the third speed gear 10 and the fourth speed gear 11, and the gears 10, 11 are selectively connected to the input shaft 6 by the synchronizer 12. A fifth speed gear 13 is rotatably supported at the rear end of the input shaft 6, and the fifth speed gear 13 is selectively connected to the input shaft 6 by a 5-speed switching synchronizer 14.

A first speed gear 21 and a second speed gear 22 are rotatably supported on the front end side of the output shaft 20, and these gears 21 and 22 are connected to the first speed gear 7 and the second speed gear 8 on the input shaft 6. Each biting. A 1-2 speed switching synchronizer 23 is provided between the first speed gear 21 and the second speed gear 22, and a reverse gear 23a is provided on the sleeve of the synchronizer 23. The reverse gear 23 a meshes with the reverse gear 9 of the input shaft 6 via a reverse idler gear 16 that is slidably supported on the idler shaft 15. A third speed gear 24 and a fourth speed gear 25 are fixed to the rear end side of the output shaft 20, and these gears 24 and 25 are connected to the third speed gear 10 and the fourth speed gear 11 of the input shaft 6. Each biting. Further, a fifth speed gear 26 is fixed to the rear end of the output shaft 20, and the gear 26 meshes with the fifth speed gear 13 of the input shaft 6. The fifth speed gear 13 of the input shaft 6 and the fifth speed gear 26 of the output shaft 20 are disposed outside the case 2 and covered with the rear cover 3.

An output gear 27 is integrally formed at the front end of the output shaft 20, and this gear 27 meshes with a ring gear 31 of the differential device 30. Differential shafts 32 and 33 protrude from the differential device 30 on both sides, and the differential shafts 32 and 33 are connected to axles, respectively. A vehicle speed detection gear 34 is attached to the differential device 30, and a gear 36 of a vehicle speed sensor 35 is engaged with the gear 34 in an orthogonal direction (see FIG. 3).

A change lever (not shown) is operated by the driver, and the movement of the change lever in the select direction and the shift direction is arranged above the case 2 via the select cable 40 and the shift cable 41 as shown in FIG. The select outer lever 42 and the shift outer lever 46 are connected to each other. The case 2 includes a differential cover 2a that covers one side of the differential device 30, a body 2b that houses a transmission mechanism including the input shaft 6 and the output shaft 20, and a connection between the differential cover 2a and the body 2b. An arch-shaped or inclined reinforcing portion 2c is integrally formed (see FIGS. 2, 3, and 5). The reinforcement part 2c suppresses the deflection of the differential cover part 2a and reinforces it, and is composed of a plurality of reinforcement ribs. The reinforcing portion 2c extends in the horizontal direction from the outer peripheral surface of the body portion 2b, and is coupled to the outer surface of the differential cover portion 2a, particularly the outer surface below the upper edge portion of the differential cover portion 2a, in the orthogonal direction. As shown in FIG. 2, the reinforcing portion 2 c of this embodiment is formed in a circular shape so as to surround the differential shaft 33. A horizontal flat surface portion 2d is formed on the upper surface of the reinforcing portion 2c, and the flat surface portion 2d is positioned below the upper edge portion of the differential cover portion 2a by a height H (see FIG. 2). The control shaft 50 is inserted into the case 2 through a shaft hole 2e formed in the flat portion 2d. A rubber seal 501 is interposed between the control shaft 50 and the shaft hole 2e, and a bellows-like rubber boot 502 is installed to prevent dust from entering the shaft hole 2e.

On the flat surface portion 2d, a select outer lever support bracket 44 is fixed by a bolt 45, and the select outer lever 42 is swingably supported by the bracket 44 with a horizontal shaft 421 as a fulcrum. That is, the flat surface portion 2 d is a mounting seat surface of the bracket 44. As shown in FIG. 8, the select outer lever 42 is a bifurcated part. A pin 43 is fixed to one end of the select outer lever 42, and the select cable 40 is connected to the pin 43. A select guide 51 is fixed to the upper end portion of the control shaft 50 protruding from the flat surface portion 2d, and a resin bush 422 attached to the other end portion of the select outer lever 42 is engaged with a groove of the select guide 51. Therefore, when the change lever is selected, the control shaft 50 can be slid in the axial direction via the select outer lever 42. As described above, since the bracket 44 is fixed on the upper surface (planar portion) 2d of the reinforcing portion 2c in which the shaft hole 2e is formed, the bracket 44 can be positioned below the upper end surface of the differential cover portion 2a. The position of the select outer lever 42 can also be lowered. Therefore, the protrusion height of the select outer lever 42 from the transmission case 2 can be reduced.

As shown in FIGS. 5 and 6, the shift outer lever 46 is fixed to the uppermost end portion of the control shaft 50 protruding from the flat surface portion 2 d, and is shifted to the pin 47 fixed to the intermediate portion of the shift outer lever 46. A cable 41 is connected. Therefore, when the change lever is operated to shift, the control shaft 50 can be rotated around its axis. A weight 48 for improving the operational feeling is fixed to the tip of the shift outer lever 46.

As shown in FIGS. 6 to 8, the control shaft 50 is arranged vertically with respect to the case 2, and its upper part is guided to rotate and slide freely by the shaft hole 2e of the flat part 2d, and the lower part is It is inserted into a shaft hole 2g of a bearing portion 2f projecting from the inside of the case 2, and is guided so as to be rotatable and slidable. A bush for improving the slidability may be appropriately inserted inside the shaft holes 2e and 2g. Particularly, since the upper shaft hole 2e is formed in the reinforcing portion 2c itself of the case 2, the rigidity is high, and the upper and lower portions of the control shaft 50 are guided by opening a long span through the shaft hole 2e and the bearing portion 2f. Therefore, the control shaft 50 can operate stably in the rotational direction and the axial direction. Therefore, even if a moment in the falling direction acts on the control shaft 50 by a shift operation and a select operation, the tilt and backlash can be reliably suppressed, and a shift mechanism with excellent shift feeling and reliability can be realized.

As shown in FIG. 6 and FIG. 9, the control shaft 50 passes through between the third speed gear 24 and the fourth speed gear 25 of the output shaft 20 and is perpendicular to the output shaft 20. It is arranged close to the part. In particular, the control shaft 50 is disposed so that at least a part of the control shaft 50 is positioned on the output shaft 20 side with respect to the axial lines L1 and L2 passing through the outer peripheral ends of the two transmission gears 24 and 25. That is, when viewed from the axial direction of the output shaft 20, both the transmission gears 24 and 25 and the control shaft 50 are arranged so as to partially overlap (see FIG. 6). A small-diameter spacer 28 is interposed between the third speed gear 24 and the fourth speed gear 25, and the control shaft 50 is inserted at a position close to the spacer 28. The spacer 28 can be omitted. As described above, since the control shaft 50 is inserted between the transmission gears 24 and 25 and close to the side portion of the output shaft 20, the case 2 covering the outside of the control shaft 50 does not protrude greatly to the outside. The case 2 can be miniaturized.

A lower end portion of the control shaft 50 inserted in the lower portion of the case 2 is connected to the shift fork mechanism 60 via a bell crank 54. The shift fork mechanism 60 is disposed below the input shaft 6 and the output shaft 20. As shown in FIG. 7, an inner lever 52 is fixed to the lower end portion of the control shaft 50 by a bolt 53. A tool insertion window 2h for tightening a bolt 53 from the outside is formed at a portion of the case 2 corresponding to the inner lever 52. The tool insertion window 2h is closed by the rear cover 3 (see FIG. 4). One arm portion 54a of the bell crank 54 is fitted in a swingable manner in a recess 52a formed at the tip of the inner lever 52. The bell crank 54 is slidably inserted into a support shaft 56 supported at both ends by a support bracket 55 and is held in a neutral position by a pair of springs 57 and 57. The movement of the control shaft 50 in the select direction (axial direction) is converted into the movement of the bell crank 54 in the axial direction, and the movement of the control shaft 50 in the shift direction (rotational direction) is converted into the movement of the bell crank 54 in the rotational direction. .

The support bracket 55 also supports a reverse restrict cam 58 as shown in FIG. That is, when shifting from the fifth speed directly to reverse (R), the claw portion 54c of the bell crank 54 hits the claw portion 58a of the reverse restrict cam 58 and the cam 58 also hits the end surface of the hole 55a provided in the support bracket 55. Since it can only rotate, the bell crank 54 is also restricted from rotating further. As a result, a direct misshift to reverse can be prevented.

As shown in FIG. 3, the shift fork mechanism 60 includes a 1-speed-2 speed shift fork shaft 61, a 3-speed-4 speed shift fork shaft 62, and a 5-speed-R shift fork shaft which are arranged in parallel to each other. 63, and both end portions of the shift fork shafts 61 to 63 are slidably supported by the case 2. The other arm portion 54b of the bell crank 54 selectively engages with any of the fork heads 61a to 63a fixed to the shift fork shafts 61 to 63 by a selection operation. Then, by operating the selected shift fork shafts 61 to 63 in the axial direction by a shift operation, a shift fork (not shown) activates the synchronizers 12, 14, and 23 to achieve a desired gear stage. be able to.

In the embodiment, as shown in FIG. 9, the control shaft 50 passes between two adjacent transmission gears (the third speed gear 24 and the fourth speed gear 25), and only a part of the control shaft 50 is present. Although arranged so as to be closer to the output shaft 20 side than the lines L1 and L2 passing through the outer peripheral ends of the two transmission gears 24 and 25, the present invention is not limited to this. For example, as shown in FIG. 10A, between the two adjacent transmission gears 70 and 71, so as to completely enter the shaft 72 side from the lines L1 and L2 of the transmission gears 70 and 71. A control shaft 73 may be arranged. Further, as shown in FIG. 10 (b), not between two adjacent transmission gears but between two small gears 80 and 81, large gears 82 and 83 are arranged on both sides thereof. In this case, the control shaft 85 may be disposed so as to pass between the large-diameter gears 82 and 83 and be closer to the shaft 84 side than the lines L1 and L2 of the gears 82 and 83. In this case, the control shaft 85 is located between the small-diameter gears 80 and 81 and on the outer peripheral side. As shown in FIG. 10 (c), when large-diameter gears 91 and 92 are arranged on both sides with one small-diameter gear 90 in between, the large-diameter gears 91 and 92 are passed through. The control shaft 94 may be disposed so as to be closer to the shaft 93 side than the lines L1 and L2 of the gears 91 and 92. In this case, the control shaft 94 is located on the outer peripheral side of the small-diameter gear 90.

In the above embodiment, the control shaft is inserted between the third speed gear and the fourth speed gear provided on the output shaft, but the control shaft is inserted between the transmission gear provided on the input shaft. May be.
Further, the present invention is not limited to the FF type manual transmission but can be similarly applied to the FR type manual transmission. In this case, the first axis is the input axis, but the second axis is the counter axis.

1 is an overall cross-sectional view of a manual transmission according to the present invention. It is the side view which looked at the transmission case which removed the front cover from the back side. It is the side view which looked at the transmission case which removed the front cover and the rear cover from the back side. It is the IV-IV sectional view taken on the line of FIG. It is a top view of a transmission case. It is a longitudinal cross-sectional view which shows the whole control shaft. It is a longitudinal cross-sectional view which shows the lower end part of a control shaft. It is a side view which shows the connection part of a select cable and a control shaft. It is the IX-IX sectional view taken on the line of FIG. It is the schematic of the other example of arrangement | positioning of the control shaft which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Front cover 2 Transmission case 2a Differential cover part 2b Body part 2c Reinforcement part 2d Plane part 2e Shaft hole 2f Bearing part 2g Shaft hole 3 Rear cover 6 Input shaft 7 1st speed gear 8 2nd speed gear 9 Reverse gear 10 3rd speed Gear 11 4th speed gear 12 3-4 speed switching synchronizer 13 5th speed gear 14 5 speed switching synchronizer 15 idler shaft 16 reverse idler gear 20 output shaft 21 first speed gear 22 second speed gear 23 1-2 Speed change synchronization device 23a Reverse gear 24 Third gear 25 Fourth gear 26 Fifth gear 27 Output gear 30 Differential gear 32, 33 Differential shaft 40 Select cable 41 Shift cable 42 Select outer lever 46 Shift outer lever 50 Control Shaft 51 Select guide 52 Inner lever 54 Bell crank 60 Shift fork mechanism 61 First gear Shifting the second speed shift fork shaft 62 third gear-fourth gear fork shaft 63 5-speed -R shift fork shaft

Claims (2)

A first shaft that receives power from the engine, a second shaft that outputs power to the axle, and a power that is disposed below the first shaft and the second shaft and is transmitted from the first shaft to the second shaft. A shift fork mechanism for selecting one of a plurality of transmission gear trains provided in the transmission path, and sliding in the axial direction and the rotational direction in conjunction with the selection lever and shift operation of the change lever, A manual transmission comprising: a control shaft that transmits a movement to the shift fork mechanism to achieve a desired shift speed;
The control shaft is arranged in the vertical direction so as to pass between two transmission gears supported on the same shaft among the transmission gears constituting the transmission gear train, and a part of the control shaft is the two A shifting operation device for a manual transmission, wherein the shifting operation device is disposed so as to be positioned on an axis side supporting the transmission gear from an outer peripheral end of the transmission gear. The shift operation device for a manual transmission according to claim 1, wherein the control shaft is disposed so as to pass between two adjacent transmission gears that do not have a synchronization device.

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