JPH07217726A - Lubrication device for shift forks - Google Patents

Abstract

(57) [Abstract] [Object] The present invention prevents the seizure between the shift fork and the synchronizer sleeve by lubricating the space between the shift fork and the synchronizer sleeve, and reduces the heat generation and wear due to the seizure to reduce the deterioration of oil. Prevents dirt, reduces rotation resistance of the synchronizer sleeve to improve fuel efficiency and output, and further reduces the manufacturing cost of the shift fork by forming an oil supply groove without complicating the structure of the shift fork. The purpose is to maintain. Therefore, at least one of the claws is provided with an oil supply groove extending in the circumferential direction of the synchronizer sleeve.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shift fork lubrication device, and more particularly to a shift fork lubrication device in which both ends of an arcuate fork portion are provided with claw portions for engaging a synchronizer sleeve.

[0002]

2. Description of the Related Art A vehicle such as an automobile is provided with a transmission in order to convert the driving force generated by an internal combustion engine into a desired one in accordance with a running state and to take it out. The transmission may be a gear type, a torque converter type, a belt type, or the like. A gear transmission has a plurality of speed change gear trains between rotating shafts and a synchronous meshing mechanism that selectively meshes one of the plurality of speed change gear trains. One of the rows is selectively meshed to convert the driving force of the internal combustion engine to a desired value in accordance with the running condition and take it out.

As disclosed in Japanese Utility Model Laid-Open No. 62-194240, a lubrication device for a speed change mechanism includes a sleeve slidably supported by a shaft arranged in a transmission case, and a sleeve arranged above the sleeve. In a transmission mechanism including a shift fork that fits in a fitting groove formed on the outer periphery of the sleeve, a collecting portion for lubricating oil that scatters in the transmission case is provided on the outer surface of the shift fork, and There has been one in which an oil supply hole is formed which penetrates the fitting portion of the sleeve from the outer surface into the fitting groove and supplies the lubricating oil collected by the collecting portion to the fitting portion.

Furthermore, as a lubricating device for a shift fork, in a shift fork in which a sleeve is moved in the axial direction of the rotary shaft so as to connect and disconnect a gear supported by a rotary shaft so as to idle, the shift fork is fixed. A first oil passage is provided in the shift shaft, and a second end of the shift fork is opened at the first end of the first oil passage and at the end of the shift fork engaging with the outside of the sleeve.
Some had an oil passage.

Furthermore, as disclosed in Japanese Utility Model Laid-Open No. 3-51265, a shift fork of a transmission has a shift fork and a shift fork as disclosed in Japanese Unexamined Utility Model Publication No. 3-51265. In a transmission including a shift fork having a fork portion, a boss portion for fitting a shift fork shaft with a fork shaft is axially offset with respect to the fork portion to correspond to a boss portion of an outer peripheral rib covering the outer periphery of the fork portion. In addition to providing an oil supply hole that penetrates the inside and outside of the part, an oil collection rib that collects the lubricating oil that scatters in the case is provided at a location that corresponds to the oil supply hole on the inner surface of the transmission case. There is a configuration in which the dropped lubricating oil is supplied to the contact surface of the shift fork with the sleeve via the oil supply hole.

Further, as a shift fork of a transmission, as disclosed in Japanese Utility Model Laid-Open No. 3-53664, a speed change gear that is rotatably supported by a speed change shaft and a connecting body that is coaxially spline-fitted are used. A shift fork that axially moves a synchro sleeve that is spline-fitted to the connecting body to engage and disengage, and formed an oil guide that guides the oil attached to the outer surface and flowing down to the sliding portion with the synchro sleeve. There was something.

Further, as the shift fork of the transmission,
As disclosed in Japanese Utility Model Unexamined Publication No. 4-72151, at least a radially inner portion of the coupling sleeve is fitted into a circumferential groove of the coupling sleeve to move the coupling sleeve in the axial direction, and At least a part of the radially inner portion is fitted in the groove with a gap, and the inner bone portion that integrally holds the sliding claw portion at the transitional portion of the circumferential tip, and the sliding claw portion and the inner bone portion. A shift fork that is integrally disposed on the outside in the radial direction and that has an outer support portion that is wider in the axial direction than these, and that shifts from the radially outer side to the inner side in the sliding claw portion direction at the transition portion of the inner bone portion. Some had ribs that faced.

Furthermore, as a shift fork of a manual transmission, as disclosed in Japanese Utility Model Laid-Open No. 3-125943, a transmission gear shaft disposed in a casing of the manual transmission and a radius outside the transmission gear are outside. The clutch hub is coaxially arranged toward one side, the sleeve has a rib for abuttingly fitting with a groove formed on the outer circumference of the sleeve, and the shift fork has a hole for inserting the shift shaft. In some cases, there is a claw portion that is separated into a circular shape and that is fitted into the groove at the tip of the inner peripheral portion, and a step portion is formed on the outer periphery of at least one rib.

Further, as a lubricating structure of the shift fork, a lubricating hole for supplying lubricating oil is formed on the sliding surface of the claw portion of the shift fork, and an oil catcher for supplying lubricating oil to the lubricating hole is provided. There was something.

Further, as a shift fork of a manual transmission, as disclosed in Japanese Utility Model Publication No. 5-18531, an annular groove provided on the outer circumference of a clutch hub sleeve assembled to a shift fork shaft to form a synchromesh. In a shift fork of a manual transmission in which the sleeve is slid in the axial direction by abutting against the side wall surface of the annular groove when fitted and operating the shift lever, the circumferential direction of the contact surface of the shift fork facing the side wall surface of the sleeve. There is a chamfer formed at both ends of the shift fork, and an arcuate groove extending from the inside of the shift fork to the outer periphery and reaching the inner periphery is formed between the both sides of the contact surface.

[0011]

By the way, in the conventional gear transmission, it is necessary to form ribs, oil holes, oil receiving portions, etc. in order to lubricate the shift fork and the synchronizer sleeve.

As a result, the manufacturing cost of the shift fork is increased, which is economically disadvantageous, and the space for the shift fork is heavy, which may limit the layout of the shift fork. However, there is an inconvenience that it is disadvantageous in practical use.

[0013]

In order to eliminate such inconvenience, the present invention provides an attachment hole portion to be attached to a shift shaft and an arc-shaped fork portion, and the inside of both end portions of this fork portion. In the shift fork in which a claw portion slightly projecting in the direction is provided, and the claw portion engages with the synchronizer sleeve that changes the meshing state of the gear group, at least one claw portion is supplied with an oil that extends in the circumferential direction of the synchronizer sleeve. It is characterized in that a groove for use is provided.

[0014]

According to the structure of the present invention, when the synchronizer sleeve rotates, the oil is supplied to the oil supply groove portion provided on at least one of the claw portions provided on both ends of the fork portion of the shift fork. The introduced oil is supplied in the rotating direction of the synchronizer sleeve to lubricate the other claw portion.

[0015]

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

1 to 9 show an embodiment of the present invention. 3, 2 is a gear transmission, 4 is a transmission case, 6 is an input shaft, 8 is a counter shaft, 10 is a main shaft, 12 is a backward idler shaft, and 14 to 22 are first speed gear trains.
A fifth-speed gear train, 24 is a reverse gear train, 26 is a first speed / second speed synchronous meshing mechanism, 28 is a third speed / fourth speed synchronous meshing mechanism, and 30 is a fifth speed / reverse synchronous meshing mechanism.

The first speed / second speed synchromesh mechanism 26 is mounted on the main shaft 10 between the first speed gear train 16 and the second speed gear train 18.
The first and second speed synchronizer hubs 32 are fixedly provided, and the first and second speed synchronizer hubs 32 are provided.
A fast synchronizer sleeve 34 is provided so as to be movable in the axial direction. The first / second speed synchronizer sleeve 34 is engaged with a first / second speed shift fork 38 attached to a first / second speed shift shaft 36. The first speed / second speed synchronizer sleeve 34 switches the meshing state of the first speed gear train 16 and the second speed gear train 18 by axial movement.

Further, the 3rd speed / 4th speed synchromesh mechanism 28 is
The main shaft 1 between the high speed gear train 20 and the shaft end portion of the input shaft 6.
A third speed / fourth speed synchronizer hub 40 is fixedly installed at 0, and a third speed / fourth speed synchronizer sleeve 42 is axially movable on the third speed / fourth speed synchronizer hub 40. 3rd / 4th synchronizer sleeve 4
A shift fork 46 for the third and fourth gears attached to the shift shaft 44 for the third and fourth gears is engaged with the second gear 2. The third speed / fourth speed synchronizer sleeve 42 switches the meshing state of the third speed gear train 20 and the coupling state of the input shaft 6 and the main shaft 10 by axial movement.

Further, the fifth speed / reverse synchronous meshing mechanism 30 has five
A 5-speed / reverse synchronizer hub 48 is fixedly provided on the main shaft 10 between the speed gear train 22 and the reverse gear train 24, and a 5-speed / reverse synchronizer sleeve 50 is attached to the 5-speed / reverse synchronizer hub 48. It is provided so that it can move in any direction. This 5-speed / reverse synchronizer sleeve 5
To 0, a fifth speed / reverse shift fork 54 attached to a fifth speed / reverse shift shaft 52 is engaged. The fifth speed / reverse synchronizer sleeve 50 switches the meshing state of the fifth speed gear train 22 and the reverse gear train 24 by axial movement.

The first and second speed shift forks 38, the third and fourth speed shift forks 46, and the fifth and reverse shift forks 54 have substantially the same shape.
The shift fork 38 for the second speed will also be described, and the third speed /
A description of the fourth speed shift fork 46 and the fifth speed / reverse shift fork 54 will be omitted.

The first and second speed shift forks 38 are
It has an attachment hole portion 56 attached to the first-speed / second-speed shift shaft 36 and an arcuate fork portion 58.
At both end portions of the fork portion 58, first and second claw portions 60 and 62 slightly projecting inward are provided, respectively.

Further, at least one of the first and second claw portions 60 and 62 is provided with an oil supply groove portion 64 extending in the circumferential direction of the first speed / second speed synchronizer sleeve 34.

More specifically, the first and second claw portions 60, 6
At least one of the two, for example, the first and second claw portions 60, 62
Both of the first and second oil supply groove portions 64-1 and 64-
2 are provided respectively.

Further, as shown in FIGS. 4 (a) and 4 (b), the width of the upstream portion of the first oil supply groove portion 64-1 in the circumferential direction of the first speed / second speed synchronizer sleeve 34. The upstream side width W1 and the downstream side width W2 which is the width of the downstream portion with respect to the circumferential direction of the first speed / second speed synchronizer sleeve 34, and the second oil supply groove portion 64-2.
The upstream width W3 and the downstream width W4 are substantially the same.

Next, the operation will be described.

When the first-speed / second-speed synchronizer sleeve 34 rotates clockwise as shown in FIG. 5, the first claw portions 6 at both ends of the fork portion 58 of the first-speed / second-speed shift fork 38 are shown.
The oil is introduced into the first oil supply groove portion 64-1 provided at 0, and this oil is first supplied to the first speed / second speed synchronizer sleeve 34 and the first claw portion 60,
Lubricate the portion of the first claw portion 60, and then the second claw portion 6
Oil is introduced into the second oil supply groove portion 64-2 provided in the second oil supply portion, and this oil is supplied to the first speed / second speed synchronizer sleeve 34 and the second claw portion 62,
The claw portion 62 is lubricated.

Similarly, when the third-speed and fourth-speed synchronizer sleeve 42 rotates clockwise, the first fork provided on the fork portion (not shown) of the third-speed and fourth-speed shift fork 46.
Oil is introduced into a first oil supply groove (not shown) provided in the claw (not shown), and the oil is introduced into the third and fourth speed synchronizer sleeves 42 and the first claw (not shown). ) Part to lubricate the first claw part (not shown) part, and then the oil is introduced into the second oil supply groove part provided in the second claw part (not shown). Oil is supplied to the third-speed and fourth-speed synchronizer sleeves 42 and the second claw portion (not shown) to lubricate the second claw portion (not shown).

When the fifth speed / reverse synchronizer sleeve 50 rotates, the fifth speed / reverse shift fork 54
Oil is introduced into first oil supply groove portions (not shown) provided in first claw portions (not shown) provided at both ends of the fork portion (not shown) of the Speed
It is supplied to the retracting synchronizer sleeve 50 and the first claw portion (not shown) to lubricate the first claw portion (not shown), and then provided to the second claw portion (not shown). Oil is introduced into the second oil supply groove (not shown), and this oil is supplied to the fifth speed / reverse synchronizer sleeve 50 and the second claw (not shown) portion, and the second claw ( (Not shown) is lubricated.

As a result, each shift fork 38, 4
6, 54 and respective synchronizer sleeves 34, 42, 50
The spaces between the shift forks 38, 46, 54 can be lubricated respectively.
It is possible to prevent seizure between the synchronizer sleeves 34, 42 and 50 and the heat generation and wear due to the seizure, prevent deterioration of oil and dirt, and are practically advantageous.

Further, each shift fork 38, 46, 54
With the configuration in which the synchronizer sleeves 34, 42, 50 are lubricated, the rotational resistance of the synchronizer sleeves 34, 42, 50 can be reduced, fuel efficiency and output can be improved, and it is practically advantageous.

Further, the first and second claw portions 60, 62 have the first,
Since the second oil supply groove portions 64-1 and 64-2 are provided, the shift forks 38, 46, and 54 are provided.
The first and second oil supply groove portions 64-1 and 64-2 can be formed without complicating the structure of FIG.
The manufacturing costs of 8, 46 and 54 can be kept low, which is economically advantageous and the synchronizer sleeves 3
4, 42, 50 can be normally or reversely rotated, that is, even during reverse, the shift forks 38, 46, 54 and the synchronizer sleeves 34, 42, 50 can be lubricated respectively.
It is practically advantageous.

7 to 9 show a second embodiment of the present invention. In the second embodiment, the parts having the same functions as those of the first embodiment will be described with the same reference numerals.

The feature of the second embodiment is that at least one of the first and second claws 72 and 74, for example, both the first and second claws 72 and 74, is provided at the tip portion of the fork part 58. The first taper shape that gradually increases with the transition,
The second oil supply groove portions 76-1 and 76-2 are provided.

That is, the first oil supply groove portion 76.
-1 is formed such that the downstream side width W2 is smaller than the upstream side width W1 which is the tip end portion of the fork portion 58, and the second oil supply groove portion 76-2 is lower than the upstream side width W3 which is the tip end portion of the fork portion 58. The width W4 is formed large.

Further, the first oil supply groove portion 76-1
The downstream width W2 and the upstream width W3 of the second oil supply groove portion 76-2 are substantially the same.

As a result, the taper shape makes it easier for oil to enter, so that the oil supply amount can be increased, and the shift fork 78 and the synchronizer sleeve (not shown).
The gaps between the shift fork 78 and the synchronizer sleeve (not shown) can be reliably prevented, and the heat generation and wear caused by the seizure can be reliably reduced to prevent oil deterioration and contamination. It is possible and practically advantageous. Moreover, the first oil supply groove portion 7 is larger than the amount of oil entering the first oil supply groove portion 76-1.
The oil discharge amount of 6-1 can be reduced to improve the lubrication performance of the shift fork 78 and the synchronizer sleeve (not shown).

Further, as in the first embodiment described above, the structure in which the shift fork 78 and the synchronizer sleeve (not shown) are lubricated can reduce the rotational resistance of the synchronizer sleeve (not shown) and reduce the fuel consumption. And output can be improved, which is practically advantageous.

Further, the first and second claws 72 and 74 have first and second
Since the second oil supply groove portions 76-1 and 76-2 are provided, the first and second oil supply groove portions 76-1 and 7-7 do not complicate the structure of the shift fork 78.
6-2 can be formed, the manufacturing cost of the shift fork 78 can be maintained at a low cost, and it is economically advantageous and can correspond to the forward / reverse rotation of the synchronizer sleeve (not shown), that is, the shift can be performed at the time of reverse. The space between the fork 78 and the synchronizer sleeve (not shown) can be lubricated, which is practically advantageous.

The present invention is not limited to the first and second embodiments described above, and various application modifications are possible.

For example, in the first embodiment of the present invention, as shown in FIGS. 4A and 4B, the upstream side width W1 and the downstream side width W2 of the first oil supply groove portion 64-1. When,
Although the upstream side width W3 and the downstream side width W4 of the second oil supply groove portion 64-2 are formed to be substantially the same, FIG.
As shown in FIGS. 10A and 10B, the upstream width W1 of the first groove portion 82-1 and the downstream width W2 of the first groove portion 82-1 are formed to be substantially the same, and the second groove portion 82 is formed. -2 of the upstream side width W3 of the second groove portion 82-2 and the downstream side width W4 of the second groove portion 82-2 are formed substantially the same, and the upstream side width W2 of the second groove portion 82-2 is higher than the downstream side width W2 of the first groove portion 82-1. It is also possible to form the side width W3 small so as to make the oil supply amount different at the time of forward and reverse rotation.

As a result, the oil supply amount can be increased when the synchronizer sleeve (not shown) is normally rotated, and the space between the shift fork 84 and the synchronizer sleeve (not shown) can be surely lubricated, and the shift fork can be surely supplied. 84
It is possible to reliably prevent seizure between the and the synchronizer sleeve (not shown), and it is possible to surely reduce heat generation and wear due to seizure, and to prevent deterioration and dirt of oil, which is practically advantageous.

The first and second claw portions 86-1 and 86-2 are also provided.
With the configuration in which the first and second oil supply groove portions 82-1 and 82-2 are provided in the first and second oil supply groove portions 82-1, the structure of the shift fork 84 is not complicated.
-1, 82-2 can be formed, the manufacturing cost of the shift fork 84 can be kept low, which is economically advantageous and can correspond to the counterclockwise rotation of the synchronizer sleeve (not shown), that is, Even during reverse, the shift fork 84 and the synchronizer sleeve (not shown) can be lubricated, which is practically advantageous.

Further, in the above-mentioned second embodiment, as shown in FIGS. 9A and 9B, the downstream width W2 of the first oil supply groove portion 76-1 formed in a tapered shape, Although the upstream side width W3 of the second oil supply groove portion 76-2 formed in a tapered shape is formed to be substantially the same, the first and second
Tapered first and second oil supply groove portions 94-1 and 94-2 are provided on the claw portions 92-1 and 92-2, respectively, and the taper portions 92-1 and 92-2 have a width smaller than the downstream width W2 of the first oil supply groove portion 94-1. It is also possible to form the upstream side width W3 of the second oil supply groove portion 94-2 to be small so as to make the oil supply amount at the time of forward and reverse rotation different.

As a result, the oil supply amount can be further increased when the synchronizer sleeve (not shown) is normally rotated, and the space between the shift fork 96 and the synchronizer sleeve (not shown) can be surely lubricated. It is possible to reliably prevent seizure between the shift fork 96 and the synchronizer sleeve (not shown), and it is possible to reliably reduce heat generation and wear due to seizure, prevent oil deterioration and dirt, and are practically advantageous. is there.

Also, the first and second claw portions 92-1 and 92-2
Since the first and second oil supply groove portions 94-1 and 94-2 are provided on the first and second oil supply groove portions 94-1 and 94-2, the first and second oil supply groove portions 94 can be formed without complicating the structure of the shift fork 96.
-1, 94-2 can be formed, the manufacturing cost of the shift fork 96 can be kept low, it is economically advantageous, and the counterclockwise rotation of the synchronizer sleeve (not shown) can be supported, that is, Even during reverse, the shift fork 84 and the synchronizer sleeve (not shown) can be lubricated, which is practically advantageous. It is possible to cope with forward and reverse rotation, that is, it is possible to lubricate between the shift fork 96 and the synchronizer sleeve (not shown) even in reverse, which is practically advantageous.

Furthermore, in the first and second embodiments described above,
The first claw portion is provided with the first oil supply groove portion, and the second
Although the second oil supply groove portion is provided in the claw portion, it is also possible to provide the second oil supply groove portion in which the upstream side width and the downstream side width are substantially the same only in the first claw portion.

By doing so, since the oil supply groove is provided only in the first pawl, the manufacturing cost of the shift fork can be maintained at a much lower cost, which is economically advantageous and simplifies the shape of the shift fork. be able to.

Furthermore, if the taper-shaped oil supply groove having a smaller width on the downstream side than the width on the upstream side is formed and used only in the first claw portion, the manufacturing cost of the shift fork can be further reduced. It can be maintained and is economically advantageous,
The oil supply amount can be increased, which is practically advantageous.

[0049]

As described above in detail, according to the present invention, the mounting hole portion to be mounted on the shift shaft is provided and the arc-shaped fork portions are provided, and the both ends of the fork portion are slightly projected inwardly. In the shift fork in which the claw portion is engaged with the synchronizer sleeve that changes the meshing state of the gear group, at least one of the claw portions is provided with an oil supply groove extending in the circumferential direction of the synchronizer sleeve. The fork and synchronizer sleeve can be lubricated to prevent seizure between the shift fork and synchronizer sleeve.
Generation of heat and abrasion due to seizure can be reduced, and deterioration and stain of oil can be prevented, which is practically advantageous. In addition, the configuration in which the shift fork and the synchronizer sleeve are lubricated can reduce the rotational resistance of the synchronizer sleeve, improve fuel efficiency and output, and are practically advantageous. Further, since at least one of the claw portions is provided with the oil supply groove portion extending in the circumferential direction of the synchronizer sleeve, the oil supply groove portion can be formed without complicating the structure of the shift fork. Manufacturing cost can be kept low, which is economically advantageous.

If the oil supply groove is formed in the claws at both ends of the fork, the widths of the upstream portion and the downstream portion are substantially the same with respect to the rotating direction of the synchronizer sleeve.
The groove for oil supply can be formed without complicating the structure of the shift fork, the manufacturing cost of the shift fork can be kept low, and it is economically advantageous, and the shift fork also rotates when the synchronizer sleeve rotates during reverse. It is possible to lubricate between the and synchronizer sleeves respectively, which is practically advantageous.

Further, if the claw portions at both end portions of the fork portion are formed in a tapered shape that gradually increases as the oil supply groove portion moves to the tip portion of the fork portion, the oil is formed by the tapered shape. It becomes easier to enter, the oil supply amount can be increased, the lubrication between the shift fork and the synchronizer sleeve can be surely lubricated, the seizure between the shift fork and the synchronizer sleeve can be surely prevented, and the heat generated by the seizure can be prevented. This is practically advantageous because it can surely reduce wear and prevent oil deterioration and dirt.

[Brief description of drawings]

FIG. 1 is a schematic perspective view of one end portion of a shift fork showing a first embodiment of the present invention.

FIG. 2 is an enlarged view of one end portion of a shift fork,
(A) is a schematic side view of one end portion of the shift fork,
(B) is a bottom view of one end portion of the shift fork.

FIG. 3 is a schematic perspective view of a shift fork.

FIG. 4 is an enlarged view of a claw portion, (a) is an enlarged side view of a first claw portion, and (b) is an enlarged side view of a second claw portion.

FIG. 5 is a schematic side view of a gear transmission.

FIG. 6 is a schematic cross-sectional view of a gear transmission.

FIG. 7 is an enlarged view of a claw portion showing a second embodiment of the present invention, (a) is an enlarged side view of the first claw portion, and (b) is an enlarged bottom surface of the first claw portion.

FIG. 8 is a schematic perspective view of a shift fork.

FIG. 9 is an enlarged view of a claw portion, (a) is an enlarged side view of a first claw portion, and (b) is an enlarged side view of a second claw portion.

FIG. 10 is an enlarged view of a claw portion showing another embodiment of the present invention, (a) is an enlarged side view of a first claw portion, and (b) is an enlarged side view of a second claw portion.

FIG. 11 is an enlarged view of a claw portion showing another embodiment of the present invention, (a) is an enlarged side view of a first claw portion, and (b) is an enlarged side view of a second claw portion.

[Explanation of symbols]

 2 Gear transmission 26 1st speed / 2nd speed synchronous meshing mechanism 28 3rd speed / 4th speed synchronous meshing mechanism 30 5th speed / reverse synchronous meshing mechanism 32 1st speed / 2nd speed synchronizer hub 34 1st speed / 2nd speed synchronizer sleeve 36 1st speed 2nd speed shift shaft 38 1st and 2nd speed shift fork 40 3rd and 4th speed synchronizer hub 42 3rd and 4th speed synchronizer sleeve 44 3rd and 4th speed shift shaft 46 3rd and 4th speed shift fork 48 5 Speed / reverse synchronizer hub 50 5th / reverse synchronizer sleeve 52 5th / reverse shift shaft 54 5th / reverse shift fork 56 Mounting hole 58 Fork 60 First pawl 62 Second pawl 64 Oil supply groove

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[Procedure amendment]

[Submission date] April 13, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0016

[Correction method] Change

[Correction content]

1 to 9 show an embodiment of the present invention. 6, 2 is a gear transmission, 4 is a transmission case, 6 is an input shaft, 8 is a counter shaft, 10 is a main shaft, 12 is a backward idler shaft, and 14 to 22 are first speed gear trains.
A fifth-speed gear train, 24 is a reverse gear train, 26 is a first speed / second speed synchronous meshing mechanism, 28 is a third speed / fourth speed synchronous meshing mechanism, and 30 is a fifth speed / reverse synchronous meshing mechanism.

[Procedure Amendment 2]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

[Figure 1]

[Fig. 2]

[Figure 3]

[Figure 4]

[Figure 5]

[Figure 7]

[Figure 8]

[Figure 9]

[Figure 6]

[Figure 10]

FIG. 11

Claims (3)

[Claims] 1. A mounting hole for mounting on a shift shaft and an arcuate fork are provided, and both ends of the fork are provided with pawls that slightly project inward, and the pawls mesh with a gear group. In a shift fork engaged with a synchronizer sleeve for changing a state, at least one claw portion is provided with an oil supply groove extending in the circumferential direction of the synchronizer sleeve, the lubricating device for the shift fork. 2. The oil supply groove portion is an oil supply groove portion in which the widths of the upstream portion and the downstream portion with respect to the rotating direction of the synchronizer sleeve are formed in the claw portions at both end portions of the fork portion to be substantially the same. The lubrication device for a shift fork according to claim 1. 3. The oil supply groove portion is an oil supply groove portion formed in the claw portions at both end portions of the fork portion in a tapered shape that gradually increases as it moves to the tip portion of the fork portion. The shift fork lubrication device according to claim 1, wherein