JPH09280347A - Transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the degree of freedom of the shape of a transmission case and to improve assembly workability by a method wherein the transmission case and an idler cover to fix a reverse idler shaft are formed into different bodies from each other, and the idler cover is assembled from the outside of the transmission case. SOLUTION: An idler cover 45 is formed separately from a transmission case 9. A reverse idler shaft 50 at which a reverse idler gear 54 is rotatably supported is inserted in the idler cover 45 and supported thereat and fixed by a roll pin 51. The idler cover 45 is inserted in the opening part 60 of the transmission case 9, one idler gear 55 is engaged with a reverse counter gear 35, and after the other idler gear 56 is engaged with a reverse main gear 21, the idler cover 45 is fixed at the transmission case 9 by means of a bolt. This constitution enhances the degree of freedom of the shape of the transmission case and improves assembly property.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission in which a reverse idler gear is assembled from the outside of a transformer case to improve the assembling property.

[0002]

2. Description of the Related Art As a conventional transmission, for example, those shown in FIGS. 3 and 4 are known. In FIGS. 3 and 4, reference numeral 101 denotes a main drive shaft rotatably supported by a transformer case 103 via a bearing 102.
A main drive gear (fourth-speed main gear) 105 having a clutch gear 104 is integrally formed.

Reference numeral 106 designates bearings 107, 108, 10
A main shaft that is rotatably supported by a main drive gear 105, a transformer case 103, and a rear extension case 110 via a shaft 9. The main shaft 106 has a third speed main gear 111, a second speed main gear 112, and an axial direction. A first speed main gear 113 is rotatably provided, a reverse main gear 115 is provided via a hub 114, and a fifth speed main gear 116 is fixed. Further, on the main shaft 106, a synchronous meshing device 117 for switching between fourth speed and third speed and a synchronous meshing device 118 for switching between second speed and first speed are provided.

Reference numeral 119 is a counter shaft integrally formed with a counter drive gear 120 that meshes with the main drive gear 105.
The third speed counter gear 12 meshing with the high speed main gear 111
A second speed counter gear 122 that meshes with the first and second speed main gears 112 is integrally formed with a first speed counter gear 123 that meshes with the first speed main gear 113, and a fifth speed counter gear 124 that meshes with the fifth speed main gear 116 rotates. It is provided freely. Further, a synchronous meshing device 125 for switching between fifth speed and reverse is provided at the shaft end of the counter shaft 119.

Reference numeral 126 is a select lever, and the select lever 126 is a shift rod 12 for fifth speed-reverse.
8. The shift rods for the first-second speed (not shown) and the shift rods for the third-fourth speed (not shown) are selected.
A shift lever 129 is engaged with the select lever 126, and the shift lever 129 moves the selected shift rod.

Reference numeral 130 denotes a clutch lever fixed to the clutch housing 131 with a pivot 132 as a fulcrum. By operating the clutch lever 130, the rotational driving force from the engine to the main drive shaft 101 is interrupted. Reference numeral 133 denotes one reverse idler gear that meshes with the first speed counter gear 123 of the counter shaft 119, and the one reverse idler gear 133 is rotatably supported by the reverse idler shaft 135 via a bearing 134. The shaft portion 136 of one reverse idler gear 133 has the other reverse idler gear 1
When the shift fork 138 moves rightward in the figure, the other reverse idler gear 137 meshes with the reverse main gear 115 of the main shaft 106, and the main shaft 106 rotates in the reverse direction.

The transformer case 103 has a mount portion 13
9 is integrally formed, and one end of the reverse idler shaft 135 is inserted and supported in the support hole 140 formed in the mount portion 139. The large diameter portion 141 formed at the other end of the reverse idler shaft 135 is supported by the transformer case 103. That is, the reverse idler gears 133 and 137 are supported by the mount portion 140 via the reverse idler shaft 135 and assembled inside the transformer case 103.

[0008]

However, in such a conventional transmission as described above, since the mount portion for supporting the reverse idler gear is formed inside the transformer case, the casting core is required, and the aluminum core is used for casting. When making into a case, it could not be die cast. Therefore, there is a problem that the shape of the transformer case is limited and the degree of freedom of the shape of the transformer case is low. In addition, since the reverse idler gear is assembled inside the transformer case, the workability of the assembly is poor.

The present invention has been made in view of the above conventional problems, and a transformer case is provided separately from a mount portion that supports a reverse idler gear.
An object of the present invention is to provide a transmission in which the flexibility of the shape of the transformer case is increased and the workability of assembly is improved.

[0010]

In order to achieve the above object, the present invention is configured as follows. The present invention is a transmission that supports a reverse idler shaft that rotatably supports a reverse idler gear in a transformer case.
The transformer case is characterized in that the idler cover for fixing the reverse idler shaft is separate and the idler cover is assembled from the outside of the transformer case.

Further, in the present invention, the idler cover is fixed to the transformer case with bolts. Further, the idler cover of the present invention has a pair of mount portions that support the reverse idler shaft. In the present invention,
The reverse idler shaft was fixed to the mount part of the idler cover with a roll pin.

Further, since the idler cover has a pair of mount portions for supporting the reverse idler shaft, it can be easily manufactured as a separate body. Further, since the reverse idler shaft is fixed to the mount portion of the idler cover with the roll pin, the reverse idler shaft can be easily fixed to the idler cover.

Therefore, according to the transmission of the present invention, the idler cover for fixing the reverse idler shaft is separated from the transformer case, and the idler cover is assembled from the outside of the transformer case. Can be increased. In the case of an aluminum case, it is possible to make it into a die cast and also to make it into a tubular shape. Finally, since the reverse idler shaft that supports the reverse idler gear can be fixed and assembled to the idler cover from the outside of the transformer case, the workability of the assembly can be improved.

Further, since the idler cover is fixed to the transformer case with bolts, it is easy to assemble and sufficient rigidity can be obtained.

[0015]

1 and 2 are sectional views of a transmission according to the present invention. 1 and 2, reference numeral 1 denotes a main drive shaft, and the main drive shaft 1 is rotatably supported by a clutch housing 3 via a bearing 2. A main drive gear (fourth-speed main gear) 4 is integrally formed on the main drive shaft 1, and a clutch gear 5 is provided on the main drive gear 4. A front cover 7 is fixed to the clutch housing 3 with bolts 6, and the main drive shaft 1 penetrates the front cover 7.

Reference numeral 8 denotes a main shaft. The main shaft 8 is provided with a main drive gear 4, a transformer case 9 and a rear extension case 10, and bearings 1 and 1.
It is rotatably supported via 2 and 13. The main shaft 8 has a third speed main gear 15 having a clutch gear 14 in the axial direction, a second speed main gear 17 having a clutch gear 16, and a first speed main gear 1 having a clutch gear 18.
9. Reverse main gear 2 having clutch gear 20
First, a fifth speed main gear 23 having a clutch gear 22 is rotatably supported, and a speedometer gear 24 is fixed.

Main drive gear (four-speed main gear) 4
The first synchromesh device 25 is provided between the third main gear 15 and the third gear.
Is provided, and the first synchromesh device 25 switches between the main drive gear 4 and the third speed main gear 15. A second synchromesh device 26 is provided between the second speed main gear 17 and the first speed main gear 19, and the second synchromesh device 26 switches between the second speed main gear 17 and the first speed main gear 19.
Further, a third synchromesh device 27 is provided between the reverse main gear 21 and the fifth speed main gear 23, and the third synchromesh device 27 switches between the reverse main gear 21 and the fifth speed main gear 23. . Reference numeral 28 denotes a counter shaft, which is provided in parallel with the main shaft 8 and is rotatably supported by the clutch housing 3 and the transformer case 9 via bearings 29 and 30. A counter drive gear 31, a third speed counter gear 32, a second speed counter gear 33, a first speed counter gear 34, a reverse counter gear 35 and a fifth speed counter gear 36 are integrally formed on the counter shaft 28 in the axial direction. The gear 31 meshes with the main drive gear 4, the third gear counter gear 32 meshes with the third gear main gear 15, the second gear counter gear 33 meshes with the second gear main gear 17, and the first gear counter gear 34 has the first gear main. The fifth gear counter gear 36 meshes with the gear 19, and the fifth gear counter gear 36 meshes with the fifth gear main gear 23.

Reference numeral 37 is a striking lever, and a select lever 38 is engaged with the striking lever 37. The select lever 38 is fixed to the end of a rod 39, and a rod 40 is connected to the rod 39. By rotating the rods 39 and 40 and operating the select lever 38, one of the first speed-second speed shift rod, the third speed-fourth speed shift rod, and the fifth speed-reverse shift rod is selected. ing. By rotating the cross shaft 41 to which the striking lever 37 is fixed, the selected shift rod is moved in the axial direction, and the shift forks 42, 43, 4 connected to the shift rod are moved.
By moving the fourth gear, the first gear, the second gear, the third gear, the fourth gear, the fifth gear and the reverse gear are switched.

Reference numeral 45 is an idler cover, which is separate from the transformer case 9. The idler cover 45 is integrally formed with a pair of mount portions 46 and 47. The mount portions 46 and 47 have support holes 48,
49 are formed respectively. A reverse idler shaft 50 is inserted and supported in the support holes 48 and 49, and the reverse idler shaft 50 is fixed to the mount portions 46 and 47 by a roll pin 51. A reverse idler gear 54 is rotatably supported on the reverse idler shaft 50 via bearings 52 and 53. One idler gear 55 of the reverse idler gear 54 meshes with the reverse counter gear 35 of the counter shaft 28, and the other idler gear 5 of the reverse idler gear 54.
Reference numeral 6 meshes with the reverse main gear 21 of the main shaft 8. Accordingly, when the third synchronous meshing device 27 is meshed with the reverse main gear 21, the rotational force from the main drive shaft 1 causes the main drive gear 4, the counter drive gear 31, the counter shaft 28, the reverse counter gear 35, and one of the It is transmitted to the main shaft 8 via the idler gear 55, the other idler gear 56, and the reverse main gear 21, and the main shaft 8 rotates in the reverse direction.

An accommodating portion 57 is integrally formed between the pair of mount portions 46 and 47, and a reverse idler gear 54 is rotatably accommodated in the accommodating portion 57. Mounting portions 58 and 59 are integrally formed on the outer sides of the pair of mounting portions 46 and 47, and the mounting portions 58 and 59 are fixed to the transformer case 9 with bolts. Next, the attachment of the idler cover 45 to the transformer case 9 will be described.

Mount parts 46 and 4 of the idler cover 45
The reverse idler shaft 50, which rotatably supports the reverse idler gear 54, is inserted into and supported by the support holes 48 and 49 of 7 and the reverse idler shaft 50 is fixed to the mount portion 47 by the roll pin 51. Next, in this state, the idler cover 45 is inserted from the opening 60 of the transformer case 9, one idler gear 55 is meshed with the reverse counter gear 35, and the other idler gear 56 is meshed with the reverse main gear 21. 45
The mounting portions 58 and 59 of are fixed to the transformer case 9 with bolts.

As described above, since the transformer case 9 and the idler cover 45 are formed separately and the pair of mount portions 46 and 47 are integrally formed on the idler cover 45, the degree of freedom in the shape of the transformer case 9 can be increased. . It is not necessary to integrally form a mount portion in the transformer case 9 as in the conventional case. Therefore, in the case of the aluminum case, it is possible to make it die-cast, and also to make it cylindrical. Further, since the idler cover 45 is finally assembled from the outside of the transformer case 9, the workability of the assembly can be improved.

[0023]

As described above, according to the present invention, the transformer case and the idler cover are provided separately, and the mount portion for supporting the reverse idler gear is integrally formed on the idler cover to form the outer side of the transformer case. Since the idler cover is assembled, the die-casting can be performed and the degree of freedom of the shape of the transformer case can be increased. Moreover, since the idler cover is assembled from the outside of the transformer case, the assembling property can be improved.

[Brief description of drawings]

FIG. 1 is a left half sectional view of a transmission according to the present invention.

FIG. 2 is a right half sectional view of the transmission of the present invention.

FIG. 3 is a left half sectional view of a conventional transmission.

FIG. 4 is a right half sectional view of a conventional transmission.

[Explanation of symbols]

1: Main drive shaft 2, 11, 12, 13, 29, 30, 52, 53: Bearing 3: Clutch housing 4: Main drive gear (main 4th speed gear) 5, 14, 16, 18, 20, 22: Clutch Gear 6: Bolt 7: Front cover 8: Main shaft 9: Transformer case 10: Rear extension case 15: 3rd speed main gear 17: 2nd speed main gear 19: 1st speed main gear 21: Reverse main gear 23: 5th speed main gear 24: Speedometer gear 25-27: 1st-3rd synchronous meshing device 28: Counter shaft 31: Counter drive gear 32: Third speed counter gear 33: Second speed counter gear 34: First speed counter gear 35: Reverse counter gear 36: 5th speed counter gear 37: Strike lever 38: Select Trevor 39, 40: Rod 41: Cross shaft 42-44: Shift fork 45: Idler cover 46, 47: Mount part 48, 49: Support hole 50: Reverse idler shaft 51: Roll pin 54: Reverse idler gear 55: One idler gear 56: Other idler gear 57: Storage part 58, 59: Mounting part 60: Opening part

Claims (4)

[Claims] 1. A transmission in which a reverse idler shaft, which rotatably supports a reverse idler gear, is supported in a transformer case, wherein an idler cover for fixing the reverse idler shaft is separate from the transformer case. A transmission in which the idler cover is assembled from the outside of the transmission. 2. The transmission according to claim 1, wherein the idler cover is fixed to the transformer case with bolts. 3. The transmission according to claim 1, wherein the idler cover has a pair of mount portions that support the reverse idler shaft. 4. The transmission according to claim 3, wherein the reverse idler shaft is fixed to the mount portion of the idler cover with a roll pin.