JPH0659655U - Reverse idler gear support device for transmission - Google Patents

Abstract

(57) [Summary] [Purpose] The purpose of the present invention is to prevent oil lock when inserting the reverse idler shaft into the bearing hole without providing a notch for bleeding air in the bearing hole. [Constitution] Housing 3 of reverse idler shaft 2
The shaft center hole 3a opening to the end face on the side is provided, and the locking portion 3b provided at the opening edge of the bearing hole 3a of the housing 3 is provided.
A hollow positioning pin 6 that engages with is provided so that the shaft center hole 3a communicates with the inside of the transmission case 4 by the positioning pin 6.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a reverse idler gear support device for a transmission.

[Prior art]

 A transmission of a vehicle has a speed change gear train including, for example, first to fifth speed gear trains for forward travel and a reverse gear train for reverse travel. As shown in FIG. 2, the reverse idler shaft 2 supporting the reverse idler gear 1 of the reverse gear train has one end 2a inserted and supported in a bearing hole 3a formed in the clutch housing 3 and the other end 2b. Is fixedly supported by a fixing bolt 5 from the outside of the transmission case 4 to a transmission case 4 which is separate from the clutch housing 3.

To assemble the reverse idler shaft 2, one end 2a is inserted into a bearing hole 3a formed in the clutch housing 3 and a positioning pin 6 is used to shift a screw hole 2e provided in the other end 2b. After positioning so as to be aligned with the fixing bolt hole 4a of the machine case 4, the transmission case 4 is put on the clutch housing 3, and the fixing bolt 5 is screwed into the screw hole 2e from the outside of the transmission case 4. However, if oil is attached to the bearing hole 3a of the clutch housing 3, when the reverse idler shaft 2 is inserted into the bearing hole 3a, the gap between the reverse idler shaft 2 and the bearing hole 3a is sealed with oil. The air inside the bearing hole 3a is trapped and compressed. Then, the compressed air pushes back the reverse idler shaft 2 to prevent a complete insertion of the reverse idler shaft 2, so that a so-called oil lock phenomenon occurs. Therefore, it is generally practiced to provide a notch 9 on the side surface of the bearing hole 3a to perform air removal, which is also disclosed, for example, in Japanese Utility Model Laid-Open No. 2-34849.

[0003]

[Problems to be solved by the device]

 In the case of the conventional structure described above, burrs are generated in the notch 9 forming portion, which may make it difficult to insert the reverse idler shaft 2 or cause troubles such as burrs separated during insertion remaining in the transmission case 4. was there. Therefore, deburring was necessary, which was a cause of cost increase.

[0004]

[Means for Solving the Problems]

 The present invention is a transmission in which one end of a reverse idler shaft that supports a reverse idler gear is inserted and supported in a bearing hole formed in a housing, and the other end is supported by a transmission case that is separate from the housing. In the reverse idler gear support device, a hollow shaft is provided at an end surface of the reverse idler shaft on the housing side to open, and a hollow portion that engages with a locking portion provided at an opening edge of a bearing hole of the housing. The above problem is solved by a reversing idler gear support device for a transmission, characterized in that the positioning pin is provided so as to project, and the positioning pin communicates the shaft center hole with the inside of the transmission case.

[0005]

[Action]

 In the reverse idler gear support device of the transmission according to the present invention, the positioning pin for aligning the screw hole of the reverse idler shaft with the fixing bolt insertion hole of the transmission case is hollow, and is opened at the end surface of the reverse idler shaft. Since air is bleeded from the shaft center hole through the positioning pin through the positioning pin, it is possible to prevent an oil lock from occurring when the reverse idler shaft is inserted into the bearing hole of the clutch housing.

[0006]

【Example】

 An embodiment of the present invention will be described below with reference to FIG. FIG. 1 is a sectional view of a reverse idler gear support device for a transmission according to the present invention, in which a reverse idler shaft (hereinafter referred to as a shaft) 2 slidably supporting a reverse idler gear 1 is One end 2a is inserted into and supported by a bearing hole 3a formed in the clutch housing 3, and the other end 2b is fixedly supported by a transmission case 4 with a fixing bolt 5. A shaft center hole 2c that opens to the end surface of the shaft 2 is provided in one end 2a of the shaft 2, and a pin insertion hole 2d in the hole radial direction is provided on the side surface of the shaft center hole 2c. Further, a positioning pin 6 made of a slotted pin is fitted into the pin insertion hole 2d so as to project from the side surface of the shaft 2. On the other hand, a groove-shaped engaging portion 3b for engaging the positioning pin 6 is provided at the opening edge of the bearing hole 3a into which the one end portion 2a of the shaft 2 is inserted and supported. The locking portion 3b is provided in such a direction that the screw hole 2e formed on the other end 2b side of the shaft 2 and the bolt insertion hole 4a of the transmission case 4 are aligned when the positioning pin 6 is engaged. It is included.

Next, the function and effect of this embodiment will be described. In assembling the shaft 2, first, the shaft 2 is aligned in the radial direction so that the positioning pin 6 projecting from the side surface of the shaft 2 engages with the locking portion 3b, and the one end 2a is clutched. It is inserted into the support hole 3a of the housing 3. At this time, the air in the space surrounded by the bearing hole 3a and the one end 2a of the shaft 2 flows into the transmission case 4 through the shaft center hole 2c and the core hole of the positioning pin 6. Therefore, the one end portion 2a of the shaft 2 is inserted into the support hole 3a of the clutch housing 3 without generating oil lock. Then, the transmission case 4 is assembled to the clutch housing 3, the fixing bolt 5 is inserted into the bolt insertion hole 4a from the outside of the speed change case 4, and is screwed into the screw hole 2e of the shaft 2. Although the slotted pin is used as the positioning pin 6 in the above-described embodiments, it may be any pin as long as it is a hollow pin and is not necessarily a slotted pin. Further, the locking portion 3b may be a protrusion instead of the groove.

[0008]

[Effect of device]

 As described above, according to the reverse idler gear support device for a transmission according to the present invention, the axial center hole that opens at one end of the reverse idler shaft is provided, and the hollow positioning pin is provided so as to project the positioning pin. As a result, the shaft center hole and the inside of the transmission case are communicated with each other.Therefore, it is possible to prevent an oil lock when inserting the reverse idler shaft into the bearing hole without providing a notch for air bleeding. There is an effect that can improve.

[Brief description of drawings]

FIG. 1 is a sectional view of a reverse idler gear support device for a transmission according to the present invention.

FIG. 2 is a cross-sectional view of a conventional reverse idler gear support device for a transmission.

[Explanation of symbols]

 1 Reverse idler gear 2 Reverse idler shaft 2c Shaft center hole 3 Clutch housing 3a Bearing hole 4 Transmission case 6 Positioning pin

Claims (1)

[Scope of utility model registration request] 1. A transmission in which one end of a reverse idler shaft that supports a reverse idler gear is inserted and supported in a bearing hole formed in a housing, and the other end is supported by a transmission case that is separate from the housing. In the reverse idler gear support device, the hollow idler gear supporting device is provided with an axial center hole that opens at the housing-side end surface of the reverse idler shaft, and a hollow positioning that engages with a locking portion provided at the opening edge of the bearing hole of the housing. A reverse idler gear support device for a transmission, characterized in that a pin is provided so as to project, and the positioning pin makes the shaft hole and the inside of the transmission case communicate with each other.