JPH0717873Y2 - Reverse idler gear support device for transmission - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a reverse idler gear support device for a transmission, and in particular, a reverse idler gear for switching a vehicle transmission to a reverse state is fixed to a reverse idler shaft,
The present invention relates to a reverse idler gear support device for a transmission that supports the reverse idler shaft.

[Prior Art] A vehicle transmission is provided with various gears for switching to, for example, a first speed to a fifth speed or a reverse state, and any one of these gears is selected by operating a speed change lever. , The shift operation is being performed to the desired speed change state.

As shown in FIG. 4, the transmission has a reverse idler shaft 134 mounted between a transmission case 128 and a clutch housing 130, and a reverse idler gear 132 is fixed to the reverse idler shaft 134.

As a reverse idler gear support device for the transmission, there is one disclosed in Japanese Utility Model Publication No. Sho 60-39575.
The reverse idle gear support device for a transmission disclosed in this publication is provided with a breather passage in the hollow chamber of the reverse idler shaft to reduce the number of processing steps.

Further, there is one disclosed in Japanese Utility Model Publication No. 62-12121.
In the mounting structure of the gear support shaft disclosed in this publication, a stop bolt in a direction orthogonal to the axial direction of the gear support shaft is screwed to a mission case, and the tip of the stop bolt is fitted to an insertion support portion. In addition to preventing the gear support shaft from coming off, a rotation restricting body that engages with the outer periphery of the collar formed in the middle of the gear support shaft is provided to prevent the gear support shaft from rotating.

[Problems to be Solved by the Invention] In the conventional reverse idler gear support device for a transmission, as shown in FIG. 4, a through hole 136 is formed in the transmission case 128 and the clutch housing 130 is provided. A hole 138 is formed in the hole 138, one end 134a of the reverse idler shaft 134 is inserted into the hole 138, and a large diameter support 140 is integrally provided at the other end 134b. It is fixed to the site by a fixing bolt 144 which is a fixing tool.

However, when the reverse idler shaft 134 is assembled, the support portion 140 provided at the other end 134b of the reverse idler shaft 134 causes the high speed sleeve 124 for switching between the third and fourth speeds.
There is a problem in that the work may be brought into contact with the outer peripheral part of the product, the assembling work becomes difficult, and the workability is significantly reduced.

Therefore, as shown in FIGS. 5 and 6, the diameter of the outer peripheral portion of the support portion 140 located on the high speed sleeve 124 side is reduced by approximately a semicircle, and the high speed sleeve 124 and the reverse idler at the time of assembling work are reduced. The contact with the other end 134b of the shaft 134 is prevented.

However, in order to perform the positioning of the reverse idler shaft 134 when the reverse idler shaft 134 is attached, as shown in FIG. 5, marks 200 such as scribing, and as shown in FIG. 202 is required, the number of parts such as marks and pins increases, the number of various processing steps increases, manufacturing becomes difficult, the cost becomes large, and there is a disadvantage that it is economically disadvantageous.

[Object of the Invention] Therefore, in order to eliminate the above-mentioned inconvenience, an object of the present invention is to prevent contact with a high speed sleeve for switching between third and fourth speeds when a reverse idler shaft of a reverse idler gear support device of a transmission is assembled. Along with the outer periphery of the high speed sleeve, a relief part cut out in an arc shape that matches the outer shape of the high speed sleeve was formed at the other end of the reverse idler shaft, so that Of the transmission, the workability can be improved, and the escaper can position the reverse idler shaft, which eliminates the need for positioning processing, simplifies the structure, and reduces the cost of the transmission. It is to implement the reverse idler gear support device.

[Means for Solving Problems] In order to achieve this object, the present invention has a reverse idler shaft having a reverse idler gear fixed, one end of which is inserted into a hole formed in a clutch housing and the other end of which is formed by a transmission case. In a reverse idler gear support device for a supporting transmission, an arcuate shape that matches the outer peripheral shape of the high speed sleeve to prevent contact with the high speed sleeve for switching the third and fourth speeds and to perform positioning when the reverse idler shaft is assembled. It is characterized in that the relief portion cut off is formed at the other end of the reverse idler shaft.

[Operation] With the configuration described above, during the assembly work of the reverse idler shaft, the arc-shaped relief formed on the other end of the reverse idler shaft prevents contact between the reverse idler shaft and the high speed sleeve, thus improving workability. In addition, the processing for positioning the reverse idler shaft is not required, and the structure is simplified to reduce the cost.

[Embodiment] An embodiment of the present invention will be described in detail below with reference to the drawings.

1 to 3 show an embodiment of this invention. Third
In the figure, 2 is a manual transmission for a vehicle of, for example, a 5-speed specification,
Reference numeral 4 is a deceleration / front wheel differential, and 6 is a transfer.

The manual transmission 2 has an input shaft 8 for inputting a driving force from an internal combustion engine (not shown) and a counter shaft 10 for transmitting the rotational force of the input shaft 8 to the differential gear 4. The counter shaft 10 and the first gear 12 for the first speed, the second gear 14 for the second speed, the third gear 16 for the third speed, and the fourth gear 18 for the fourth speed.
5th gear 20 for 5th speed, low speed sleeve 22 for switching 1st and 2nd speed, and high speed sleeve 24 for switching 3rd and 4th speed
And the fifth speed sleeve 26 are fixed to each other.

That is, on the input shaft 8, from the input side, that is, from the right side in FIG. 3, a first speed first gear 12 and a third speed third gear 16 are provided.
A high speed sleeve 24 for switching between the third and fourth speeds and a fifth speed sleeve 26 are sequentially provided, and the counter shaft 10 includes a low speed sleeve 22 for switching between the first and second speeds and a second speed sleeve from the right side in FIG. Second gear 14 and fourth gear fourth gear
The 18th gear and the fifth gear 20 for the 5th speed are sequentially provided.

Further, the transmission case 28 of the manual transmission 2
Reverse idler gear between the clutch housing 30 and
A reverse idler shaft 34 to which 32 is fixed is provided.

As shown in FIG. 2, a through hole 36 is formed in the transmission case 28, and the clutch housing is formed.
A hole 38 is formed in 30 so as to project to the clutch side (not shown).

Then, one end 34a of the reverse idler shaft 34 is formed so as to be inserted into the hole 38, and a large-diameter support portion 40 is integrally formed at the other end 34b, and a mounting hole portion 42 is formed in this support portion 40. Set up. A fixing bolt 44, which is a fixing tool that penetrates the through hole 36 from the outside of the transmission case 28, is provided in the mounting hole portion 42 so as to be fixed by screwing.

At this time, the support portion 40 is provided with an escape portion 46 that is cut in an arc shape to prevent the contact with the high speed sleeve 24 for switching the third and fourth speeds and to perform positioning during the assembling work of the reverse idler shaft 34. Set up.

More specifically, the escape portion 46 is, as shown in FIGS.
The outer periphery of the support portion 40 of the reverse idler shaft 34 on the side of the high speed sleeve 24 is cut out in a reverse arc shape which is a concave arc surface, that is, an arc shape so as to match the outer peripheral shape of the high speed sleeve 24. That is, as is apparent from FIG. 1, the escape portion 46 has a concentric circular shape with respect to the outer diameter of the high speed sleeve 24.

Further, the through hole 36 and the mounting hole portion 42 are formed at positions where the respective hole portions coincide with each other when the reverse idler shaft 34 is assembled in order to perform positioning.

Next, the operation will be described.

At the time of assembling the reverse idler shaft 34, one end 34a of the reverse idler shaft 34 is inserted into the hole 38 of the clutch housing 30, and the transmission case 28 and the clutch housing 30 are fixed at a predetermined portion by a fixture (not shown), The support portion 40 of the other end 34b of the reverse idler shaft 34 is fixed to the through hole 36 of the transmission case 28 with a fixing bolt 44.

Thereby, the arc-shaped relief portion formed in the support portion 40.
The high speed sleeve 24 for switching the 3rd and 4th speeds by 46
It is possible to prevent the contact between the support portion 40 and the support portion 40, easily perform the work of assembling the reverse idler shaft 34, and improve the workability, which is practically advantageous.

In addition, the arc-shaped escape portion 46 of the support portion 40 allows the through hole.
Since the 36 and the mounting hole 42 can be surely aligned with each other, the reverse idler shaft 34 can be accurately positioned, and a mark due to a scribing or the like or a pin for preventing the reverse idler shaft 34 from rotating is unnecessary. The number of parts such as marks and pins can be reduced, the number of various processing steps can be reduced, manufacturing can be facilitated, and cost can be reduced, which is economically advantageous.

The invention is not limited to the above-described embodiment, but various application modifications can be made.

For example, in the embodiment of the present invention, the support portion is cut into an arc shape to form the relief portion. However, contact between the high speed sleeve for switching the third and fourth speeds and the support portion can be prevented, and the reverse Any shape can be used as long as it can position the idler shaft, and a flat shape and an arc shape can be combined, or another shape can be used.

[Effect of the Invention] As described in detail above, according to the present invention, when the reverse idler shaft of the reverse idler gear support device of the transmission is assembled, the contact with the high speed sleeve for switching the third and fourth speeds is prevented and the positioning is performed. Since the relief part cut out in an arc shape that matches the outer peripheral shape of the high speed sleeve is formed at the other end of the reverse idler shaft as much as possible, the relief part formed at the other end of the reverse idler shaft is a high speed for switching between 3rd and 4th speed. It is possible to prevent contact between the speed sleeve and the reverse idler shaft, easily perform the work of assembling the reverse idler shaft, and improve the workability, which is practically advantageous. Further, since the reverse idler shaft can be positioned by the relief portion at the other end of the reverse idler shaft, a mark due to scribing or the like and a pin for preventing rotation of the reverse idler shaft are unnecessary, and the number of parts such as the mark and the pin is eliminated. And the number of various processing steps can be reduced, manufacturing can be facilitated, and cost can be reduced, which is economically advantageous.

[Brief description of drawings]

1 to 3 show an embodiment of the present invention, FIG. 1 is a schematic enlarged view of a portion I in FIG. 2, and FIG. 2 is an enlarged sectional view of an essential part showing a mounted state of a reverse idler shaft, FIG. 3 is a cutaway sectional view of a main part of a vehicle transmission. 4 to 6 show the prior art of the present invention, FIG. 4 is an enlarged cross-sectional view of an essential part showing a mounted state of a reverse idler shaft, FIG. 5 is a schematic enlarged view of a high speed sleeve and a reverse idler shaft, and FIG. FIG. 6 is a schematic enlarged view of the high speed sleeve and the reverse idler shaft. In the figure, 2 is a manual transmission for a vehicle, 4 is a deceleration / front wheel differential, 6 is a transfer, 8 is an input shaft, 10 is a counter shaft, 12 is a first gear for 1st speed, and 14 is a second gear for 2nd speed. Gears, 16 is 3
3rd gear for speed, 18 is 4th gear for 4th speed, 20 is 5th gear for 5th speed, 22 is low speed sleeve for 1st and 2nd speed switching, 24 is high speed sleeve for 3rd and 4th speed switching, and 26 is 5-speed sleeve, 28 is a transmission case, 30 is a clutch housing, 32 is a reverse idler gear, 34 is a reverse idler shaft, 34a is one end, 34b is the other end, 36 is a through hole, 38
Is a hole portion, 40 is a support portion, 42 is a mounting hole portion, 44 is a fixing bolt,
46 is an escape area.

Claims (1)

[Scope of utility model registration request] 1. A reverse idler gear support device for a transmission, wherein one end of a reverse idler shaft having a reverse idler gear fixed thereto is inserted into a hole formed in a clutch housing and the other end is supported by a transmission case. In order to prevent contact with the high speed sleeve for switching between the 3rd and 4th speeds when assembling, and to perform positioning, an escape portion cut out in an arc shape that matches the outer peripheral shape of the high speed sleeve is formed at the other end of the reverse idler shaft. A reverse idler gear support device for a transmission characterized in that