JP2008261360A - Movement prevention structure of idler gear for reverse stage - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a movement prevention structure of an idler gear for a reverse stage which prevents the idler gear for reverse stage from being moved by a compact structure when a transmission of a reverse stage selective sliding system, particularly, a gear manual transmission is shifted to neutral. <P>SOLUTION: This movement prevention structure comprises: a window (part to be engaged) 12a formed in a third fork shaft head part 12 as a fork shaft head part for reverse stage; and a restriction pin 13 as an engagement part which restricts the movement of the idler gear 1 for reverse stage in the shift direction by releasably engaging with the window 12a when at least an inner lever 7 is positioned at neutral in the select direction, and is released by the inner lever 7 when the inner lever selects a third fork shaft head part 12 for reverse stage. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for preventing the movement of an idler gear for a reverse gear in a transmission, and more particularly to a structure for preventing the movement of an idler gear for a reverse gear in a manual transmission, particularly a gear-type manual transmission of a reverse gear selection sliding type.

  In general, in a gear-type manual transmission of a selective sliding type, the forward speed is achieved via a synchronization device when the forward gear is selected, and the reverse gear is not used when selecting the reverse gear executed when stopped. The reverse gear is achieved by moving the idler gear in the shift direction and meshing the reverse gear train with each other.

  Patent Document 1 discloses a plurality of fork shafts that are guided and supported by a support member so as to be movable in the shift direction in parallel to each other, and fork shaft heads are formed on the outer periphery, and each fork shaft head of each fork shaft. A selective sliding type gear type equipped with an interlock mechanism that selectively engages and prevents any one of the fork shafts from moving in the shift direction from the neutral position of the fork shaft that remains. A manual transmission is disclosed.

JP 2005-155792 A

  FIG. 7 is a diagram for explaining a problem of a reverse gear selection sliding type gear type manual transmission according to a conventional example.

  Referring to FIG. 7, in this transmission, when the transmission is transported or when a vehicle equipped with the transmission collides, the reverse idler gear 1 is driven on the Rev idler shaft 1a by inertia. There is a problem of moving in the front direction or the rear direction. When the transmission is shifted to any one of the shift speeds, the interlock mechanism having the above-described function is operated and the reverse speed fork shaft 6 connected to the reverse speed idler gear 1 is operated. Since this is locked, this problem does not occur. However, when the transmission is in a neutral position, such as during transmission, the interlock mechanism is not operated. Therefore, when the reverse gear 1 is moved due to inertia, the reverse gear 1 is connected to the reverse gear 1. The reverse gear fork shaft 6 moves simultaneously, and as a result, the interlock mechanism is activated and it is impossible to shift to another gear.

  It is an object of the present invention to move a reverse gear idler gear that prevents a reverse gear idler gear from moving in a neutral state in a reverse gear selection sliding type transmission, particularly a gear-type manual transmission. It is to provide a prevention structure.

  In a first aspect, the present invention includes a reverse gear fork shaft head portion that is selectively engageable with an inner lever that is swingable in a shift or select direction, and is connected to a reverse gear idler gear. In a transmission having a fork shaft and achieving reverse gear by selectively sliding the reverse gear idler gear in the shift direction, an engaged portion provided on the reverse gear fork shaft head portion; At least when the inner lever is in a neutral position with respect to the shift and select directions, the engaged portion is releasably engaged to restrict movement in the shift direction of the reverse gear idler, and the inner lever is An engagement portion that is disengaged by the inner lever when the reverse-stage fork shaft head portion is selected; Providing movement prevention structure of the reverse-gear idler gear, characterized in that it comprises.

  According to the present invention, the unintended movement of the reverse-stage fork shaft in the shift direction is restricted by the movement prevention structure provided around the reverse-stage fork shaft head portion at the neutral time. Thus, for example, during neutral, unintentional interlock mechanism operation is prevented, and the gear shift intended by the operator becomes possible. Further, according to the present invention, the reverse-stage idler gear connected to the reverse-stage fork shaft is prevented from moving due to inertia during neutral, so that the reverse-stage idler gear suddenly collides with other members. Such a phenomenon is prevented. Further, since the movement preventing structure according to the present invention acts on the fork shaft head part, the empty space around the fork shaft head part can be effectively used in the transmission, and the engagement part and the engaged part are disengaged. Since the inner lever is utilized, the transmission can be made compact.

  According to the movement preventing structure according to a preferred embodiment of the present invention, the reverse-stage fork shaft is provided on the reverse-stage fork shaft head portion on one side or both sides of the engaged portion in the shift direction. In the shift position, there is a groove that is releasably engaged with the engaging portion, for example, a restrict pin. According to this aspect, the engaging portion operates not only at the neutral time but also at the predetermined shift time. That is, since this movement preventing structure functions as a lock ball mechanism at the time of shifting, for example, it is not necessary to separately provide a lock ball mechanism that acts on the fork shaft.

  According to a preferred embodiment of the present invention, the engaged portion is a window that expands toward the outside in the select direction of the fork shaft head portion and contracts toward the inside in the select direction. According to this aspect, engagement or disengagement between the engaging portion and the engaged portion is smoothly executed.

  According to a preferred embodiment of the present invention, the engaging portion includes a sleeve that is directly or indirectly attached to a transmission case that houses the transmission, a spring built in the sleeve, and the engaged portion by the spring. And a ball that is elastically biased toward the mating portion and releasably engages with the engaged portion and is pressed from the inner lever to release the engagement. According to this aspect, the structure for preventing the movement of the reverse-stage idler gear can be made compact.

  According to a preferred embodiment of the present invention, the other engaged portion provided in the other fork shaft head portion other than the reverse speed fork shaft head portion, and at least the inner lever is related to the shift and select directions. When in the neutral position, the other fork shafts provided with the other fork shaft head portions are removably engaged with the other engaged portions to restrict movement in the shift direction, and the inner lever is The other fork shaft head part is selected, and the other engaging part is released by the inner lever. For example, the other engaged portion is provided in the fork shaft head portion located in the center in the select direction. According to this aspect, the structure for preventing the movement of the reverse-stage idler gear can be made compact.

  According to a preferred embodiment of the present invention, in a transmission having a plurality of fork shafts, when an arbitrary gear stage is selected and the predetermined fork shaft is moved in the shift direction by the inner lever, the other fork shafts An interlock mechanism is provided for stopping movement in the shift direction.

  An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a structural diagram of a shift system of a transmission to which a shift prevention structure for a reverse gear according to a first embodiment of the present invention is applied. FIG. 2 is a diagram of the reverse gear idler gear of FIG. 1 as viewed from the front. FIG. 3 is a view of the fork shaft head portion of FIG. 1 as viewed from the rear.

  Referring to FIGS. 1 to 3, the transmission shift system includes any one of first to third fork shafts 4 to 6 and first to third fork shafts 4 to 6 arranged in parallel to each other. An interlock pin 8 is provided on each of the first to third fork shafts 4 to 6 to stop movement of the other shaft when one of the shafts is selected and shifted. There is an inner lever 7 connected to the shift lever and swingable in the shift or select direction, and a fork shaft head portion 9 that can be selectively engaged.

  The first fork shaft 4 is a three-speed and a four-speed fork shaft. The second fork shaft 5 is a first-speed and second-speed fork shaft. The third fork shaft 6 is a fork shaft for fifth speed and reverse gear. A reverse gear idler gear 1 is connected to the third fork shaft 6 via a reverse gear shift arm 2. The third fork 3 is connected to the third fork shaft 6, and a sleeve of a 5-speed synchronizer (not shown) is connected to the third fork 3. In this transmission, in the reverse gear, the inner lever 7 is swung to select the reverse gear fork shaft head portion 12 (see FIG. 4), and the third fork shaft 6 is shifted in the front direction Fr. This is achieved by sliding the idler gear 1 in the shift direction so that the reverse gear trains mesh with each other.

  FIG. 4 is a schematic diagram of a structure for preventing movement of the reverse gear for the reverse gear according to one embodiment of the present invention applied to the fork shaft head portion of FIG.

  Referring to FIGS. 1 to 4, particularly FIG. 4, this movement preventing structure is provided with a window (engaged) in a third fork shaft head portion 12 that is a fork shaft head portion for fifth gear and reverse gear. Part) 12a and at least when the inner lever 7 is in the neutral position with respect to the shift and select directions, it engages releasably with the window 12a to restrict the movement of the reverse gear 1 in the shift direction, and the inner lever 7 moves backward. When the third fork shaft head portion 12 which is a step is selected, a restrict pin 13 which is an engaging portion which is disengaged by the inner lever 7 is provided.

  The window 12a, which is an engaged portion, expands toward the select direction outer side of the fork shaft head portion 9, and contracts toward the select direction inner side. That is, the frame of the window 12a is provided with a high slope on the outside in the select direction. Thereby, the engagement or disengagement of the window 12a and the restrict pin 13 is smoothly executed.

  On the other hand, the restrict pin 13 that is an engaging portion includes an outer sleeve 16 that is attached to a transmission case 18 that accommodates the transmission via a screw portion 19, a spring 15 that is built in the outer sleeve 16, and a window 12 a formed by the spring 15. And a ball 14 that is elastically biased toward the window 12a and is releasably engaged with the window 12a and pressed from the inner lever 7 to be released from the engagement.

  Since the movement preventing structure according to the present embodiment acts on the fork shaft head portion 9, the space around the fork shaft head portion 9 in the transmission can be effectively used, and the transmission can be configured compactly.

  The function of the movement preventing structure for the reverse gear for the reverse gear according to the first embodiment of the present invention described above will be described.

  1 to 4, at the neutral time, the inner lever 7 is located in the second fork shaft head portion 11 in the neutral position. At this time, the ball 14 of the restrict pin 13 engages with the window 12a formed on the outer periphery of the third fork shaft head portion 12, and the third fork shaft 6 and the reverse gear 1 for the reverse gear connected thereto. The movement in the shift direction is stopped. As a result, at the neutral time, the reverse gear 1 for the reverse gear is moved due to inertia, and accordingly, the third fork shaft 6 is moved in the shift direction. As a result, the interlock pin 8 is operated, and the gear position is changed. However, for example, a phenomenon in which the shift intended by the operator is disabled due to being fixed at the reverse gear is prevented.

  On the other hand, when the reverse gear Rev or the fifth speed 5th is selected, the inner lever 7 swings into the third fork shaft head portion 12 and presses the ball 14 of the restrict pin 13 so that the ball 14 and the window The engagement of 12a is released, and the third fork shaft 6 can be moved in the shift direction.

  In the second embodiment of the present invention, differences from the first embodiment will be mainly described, and the description of the first embodiment can be appropriately referred to for the same points. FIG. 5 is a schematic diagram of a structure for preventing the movement of the reverse-stage idler gear according to the second embodiment of the present invention.

  Referring to FIG. 5, predetermined third fork shafts 6 (see FIG. 1) are provided on the outer periphery of the third fork shaft head portion 12 for the reverse gear and on both sides in the shift direction of the window 12a as the engaged portion. In the shift position (Rev or 5th), grooves 17a and 17b that are releasably engaged with the ball 14 of the restrict pin 13 are formed. The engagement between the ball 14 and the grooves 17a and 17b is naturally released when the inner lever 7 swings and the third fork shaft 6 moves in the shift direction.

  According to the movement preventing structure of the present embodiment, the restrict pin 13 operates not only at the neutral time but also at the predetermined shift time. That is, since this movement preventing structure functions as a lock ball mechanism at the time of shifting, for example, it is not necessary to separately provide a lock ball mechanism that acts on the fork shaft.

  In the third embodiment of the present invention, differences from the first embodiment will be mainly described, and the description of the first embodiment can be appropriately referred to for the same points. FIG. 6 is a schematic diagram of the structure for preventing the reverse gear idler from moving according to the third embodiment of the present invention.

  Referring to FIG. 6, the movement preventing structure according to the present embodiment has another restrictive force acting on the first fork shaft head portion 10 in addition to the restrict pin 13 acting on the third fork shaft head portion 12. A pin 20 is provided. A window (engaged portion) 10 a is formed on the outer periphery of the first fork shaft head portion 10. The restrict pin 20 and the window 10a have the same structure as the restrict pins 13 and 12a. When the restrict pin 20 is in the neutral position, the ball 21 engages with the window 10a to stop the movement of the first fork shaft 4 (see FIG. 1) in the shift direction, while the first fork shaft 4 When selected, the inner lever 7 pushes the ball 21 of the restrict pin 20 outward in the select direction, thereby allowing the first fork shaft 4 to move in the shift direction.

  In addition, the said Example 2 may be applied to a present Example, and the said groove | channel may be added to the one side or both sides of the window 10a.

  The present invention is applied to a transmission, in particular, a manual transmission, in particular, a manual transmission of a reverse gear selection sliding system. Further, the present invention is preferably applied to a transmission mounted on a vehicle.

1 is a structural diagram of a shift system of a transmission to which a reverse gear idler movement preventing structure according to Embodiment 1 of the present invention is applied. FIG. It is the figure which looked at the idler gear for reverse gears of FIG. 1 from the front direction. It is the figure which looked at the fork shaft head part of Drawing 1 from the rear direction. FIG. 4 is a schematic diagram of a reverse shifter idler gear movement prevention structure according to an embodiment of the present invention applied to the fork shaft head portion of FIG. 3. It is a schematic diagram of the movement prevention structure of the reverse gear idler gear according to the second embodiment of the present invention. It is a schematic diagram of the movement prevention structure of the reverse gear idler gear according to the third embodiment of the present invention. It is a figure for demonstrating the problem of the manual transmission of the reverse gear selection sliding system which concerns on a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Reverse gear (Rev) idler gear 1a Rev idler shaft 2 Reverse gear shift arm 3 Third fork 4 First fork shaft (for 3-speed and 4-speed fork shaft)
5 Second fork shaft (1st and 2nd fork shafts)
6 Third fork shaft (5-speed and reverse fork shaft)
7 Inner lever 8 Interlock pin 9 Fork shaft head 10 First fork shaft head (for 3rd speed and 4th speed fork shaft head)
11 Second fork shaft head (first and second fork shaft head)
12 3rd fork shaft head part (fork shaft head part for fifth speed and reverse gear)
10a Window (for reverse gear)
12a Window (for 1st or 2nd speed)
13 Restrict pin (for reverse gear)
14 Ball 15 Spring 16 Outer sleeve 17a, 17b Groove 18 Transmission case 19 Screw part 20 Restrict pin (for 1st speed etc.)
21 Ball 1st 1st speed 2nd 2nd speed 3rd 3rd speed 4th 4th speed 5th 5th speed Rev Reverse gear Fr Front direction Rr Rear direction

Claims (5)

A reverse-stage fork shaft head portion that is selectively engageable with an inner lever that is swingable in a shift or select direction, and has a reverse-stage fork shaft that is connected to a reverse-stage idler gear. In the transmission that achieves the reverse gear by selectively sliding the idler gear in the shift direction,
An engaged portion provided in the reverse gear fork shaft head portion;
At least when the inner lever is in a neutral position with respect to the shift and select directions, the engaged portion is releasably engaged to restrict movement of the reverse gear idler gear in the shift direction, and the inner lever is moved backward. An engagement portion that is disengaged by the inner lever when the stepped fork shaft head portion is selected;
A structure for preventing the movement of the idler gear for the reverse gear, characterized by comprising:   Engageably engage with the engaging portion at a predetermined shift position of the reverse speed fork shaft on one side or both sides of the shift direction of the engaged portion on the reverse speed fork shaft head portion. 2. A structure for preventing movement of an idler gear for a reverse gear according to claim 1, further comprising a groove.   The reverse gear according to claim 1 or 2, wherein the engaged portion is a window that expands toward the outside in the select direction of the fork shaft head portion and contracts toward the inside in the select direction. For preventing the idler gear from moving.   The engaging portion is elastically biased toward the engaged portion by a sleeve attached directly or indirectly to a transmission case that houses the transmission, a spring built in the sleeve, and the spring. The reverse drive according to any one of claims 1 to 3, further comprising a ball that is releasably engaged with the engaged portion and is released from the engagement by being pressed from the inner lever. Structure to prevent movement of the idler gear for steps. Other engaged parts provided in other fork shaft head parts other than the fork shaft head part for the reverse gear,
Shift direction of another fork shaft provided with the other fork shaft head portion releasably engaged with the other engaged portion when at least the inner lever is in a neutral position with respect to the shift and select directions Other engagement portions that are disengaged by the inner lever when the inner lever selects the other fork shaft head portion,
The structure for preventing movement of the idler gear for the reverse gear according to any one of claims 1 to 4, characterized by comprising:

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