JPH10103419A - Transmission with auxiliary transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the outer diameter of a low deceleration counter shaft side gear without increasing a distance between the counter shaft and an output shaft and reducing an axial diameter of a counter shaft by arranging the low decelerating counter shaft side gear of a low decelerating gear train of an auxiliary transmission part integratedly with the inside of the axial diameter of the counter shaft. SOLUTION: A low decelerating output shaft side gear 90 is journalled to an output shaft to provide a low decelerating gear train 58 of an auxiliary transmission part, and a low decelerating counter shaft side gear 92 engaged with the low decelerating output shaft side gear 90 is arranged integratedly with the inside of an axial diameter d of a counter shaft 16. It is thus possible to reduce the outer diameter of the low decelerating counter shaft side gear 92 without increasing a distance between the counter shaft 16 and the output shaft and reducing the axial diameter of the counter shaft 16. As a result, it is possible to form a transmission with an auxiliary transmission in a compact size and ensure strength of the counter shaft 16 without forming the transmission with the auxiliary transmission in a large size and reducing the strength of the counter shaft 16.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission with a sub-transmission, and more particularly to a transmission with a sub-transmission that can increase the gear ratio of a reduced speed gear train without increasing the size of the transmission with a sub-transmission. To secure the strength of the counter shaft, reduce the number of parts,
The present invention relates to a transmission with a sub-transmission, which can avoid improper assembling and erroneous assembling, improve gear accuracy, reduce noise, and improve lubrication performance.

[0002]

2. Description of the Related Art A vehicle is provided with a transmission in order to convert the driving force of an engine to a required one according to a traveling condition and to extract the required driving force. The transmission includes a gear-type transmission provided with a plurality of speed-change gear trains, an automatic transmission that automatically changes a gear ratio according to an operation state, and the like.

In addition, the gear type transmission has an input shaft for inputting a driving force from an engine, a counter shaft disposed in parallel with the input shaft, and a gear between the input shaft and the counter shaft. A main transmission section provided with a forward gear train and a reverse gear train,
A counter shaft, an output shaft parallel to the counter shaft and coaxial with the input shaft, a reduction gear train having a reduced speed ratio between the counter shaft and the output shaft, and a high reduction gear ratio. And a subtransmission unit provided with a reduction gear train.

As such a transmission with an auxiliary transmission, there is one disclosed in Japanese Patent Laid-Open No. 5-65945. In this publication, a transmission gear pair is provided between an input shaft and a counter shaft serving as a counter shaft, and a final reduction gear pair is provided between the vicinity of the rear end of the counter shaft and the front end of the output shaft. A low-speed gear shaft is coaxially spline-fitted to the rear end of the countershaft, a low-speed driven gear is provided at the front end of the output shaft, and a low-speed driving gear meshing with the low-speed driven gear is attached to the low-speed gear shaft. It is formed integrally.

[0005]

FIG. 3 shows a conventional transmission with an auxiliary transmission. In FIG. 3, reference numeral 202 denotes a transmission with a sub-transmission, 204 denotes a counter shaft, 206 denotes an output shaft, and 208 denotes a sub-transmission unit. The transmission with sub-transmission 202 includes an input shaft (not shown) for inputting a driving force from an engine (not shown), a counter shaft 204 disposed in parallel with the input shaft, and a counter shaft 204. An output shaft 206 is provided which is parallel to the input shaft and coaxial with the input shaft.

[0006] The sub-transmission unit 208 includes a counter shaft 204.
A speed reduction gear train 210 having a reduced speed ratio and a high reduction gear train 212 having a high reduction ratio are provided between the output gear 206 and the output shaft 206.

The reduced-speed gear train 210 is provided with a reduced-speed output shaft-side gear 214 pivotally supported on the output shaft 206, and a reduced-speed counter shaft-side gear 216 that meshes with the reduced-speed output shaft side gear 214. 204 is provided by spline fitting. The high reduction gear train 212 is provided with a high reduction output shaft side gear 218 supported by the output shaft 206, and the high reduction counter shaft side gear 2 meshed with the high reduction output shaft side gear 218.
20 is provided on the counter shaft 204 by spline fitting.

A high reduction speed switching mechanism 222 for switching the high reduction ratio is provided on the output shaft 206 between the reduction speed output shaft side gear 214 and the high reduction output shaft side gear 218. The high reduction speed switching mechanism 222 is provided with a high reduction speed switching hub 224 fixed to the output shaft 206.
4, a high reduction speed switching sleeve 226 is provided so as to be axially movable and non-rotatable.

The high-reduction speed switching mechanism 222 can switch to the meshing state of the low-speed gear train 210 to obtain a reduced speed ratio by connecting the high-reduction speed switching sleeve 226 to the low-speed output shaft side gear 214. Also, the high reduction speed switching mechanism 222 can obtain a high reduction ratio by switching to the meshing state of the high reduction gear train 212 by coupling the high reduction speed switching sleeve 226 to the high reduction output shaft side gear 218.

However, a conventional transmission 202 with a sub-transmission is used.
Connects the reduced speed counter shaft side gear 216 and the high reduction counter shaft side gear 220 of the subtransmission unit 208 to the counter shaft 204
Are fitted by spline fitting by press fitting.

For this reason, the respective outer diameters of the reduced speed countershaft side gear 216 and the high reduction countershaft side gear 220 of the subtransmission unit 208 must be larger than the shaft diameter which is the press-fit diameter of the countershaft 204. Therefore, there is a disadvantage that a large gear ratio cannot be obtained. In particular, the high reduction counter shaft side gear 2
The outer diameter of the reduced-speed countershaft-side gear 216 having a diameter smaller than 20 is limited by the press-fit diameter of the countershaft 204, so that there is a disadvantage that the gear ratio of the reduced-speed gear train 210 cannot be increased.

To cope with such an inconvenience, the shaft diameter of the counter shaft 204 is reduced, and the outer diameter of the reduced speed countershaft side gear 216 press-fitted into the counter shaft 204 is reduced. Although the gear ratio of the row 210 can be increased, the diameter of the counter shaft 204 must be reduced.
There is an inconvenience that causes insufficient strength.

The gear ratio of the reduction gear train 210 is determined by the counter shaft 20 without reducing the shaft diameter of the counter shaft 204.
4 and the output shaft 206, the outer diameter of the reduced speed output shaft side gear 214 is increased by increasing the shaft distance.
Although it is possible to increase the outer diameter of the reduced speed output shaft side gear 214, it is necessary to change the shape of a transmission case (not shown) and increase the size of the transmission 202 with an auxiliary transmission. Inconvenience.

Further, a conventional transmission 202 with an auxiliary transmission is provided.
Is provided with a reduced speed countershaft side gear 216 and a high reduction countershaft side gear 220 separately from the countershaft 204, respectively.
Since the assembly is performed by press-fitting to the counter shaft 204, there is a disadvantage that the number of parts is increased, and there is a possibility that assembly failure or incorrect assembly may occur. May be damaged and noise may be generated.

[0015]

SUMMARY OF THE INVENTION Therefore, in order to eliminate the above-mentioned disadvantages, the present invention provides an input shaft for inputting a driving force from an engine, and a counter shaft disposed in parallel with the input shaft. A main transmission unit having a forward gear train and a reverse gear train provided between the input shaft and the counter shaft; and a counter transmission shaft and a main transmission unit disposed in parallel with the counter shaft and coaxial with the input shaft. The transmission with a sub-transmission, comprising: an output shaft; and a sub-transmission portion provided with a reduction gear train having a reduced reduction ratio and a high reduction gear train having a high reduction ratio between the counter shaft and the output shaft. The transmission unit is characterized in that a reduced-speed countershaft side gear of a reduced-speed gear train is integrally formed within the shaft diameter of the counter shaft, and the reduced-speed counter shaft of the reduced-speed gear train of the sub-transmission unit is provided. The side gear is a reduced speed output shaft side gear that is supported on the output shaft. The Beyond meshing range extended to a position facing the high-low speed reducing switching mechanism provided on the output shaft between the low-reduction gear train and the high-speed reduction gear train, characterized in that the engraved in.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A transmission with an auxiliary transmission according to the present invention
The auxiliary transmission unit increases the inter-axis distance between the counter shaft and the output shaft by integrally cutting the reduced speed counter shaft side gear of the reduced speed gear train within the shaft diameter of the counter shaft,
The outer diameter of the reduced speed countershaft side gear can be reduced without reducing the shaft diameter of the counter shaft, and the reduced speed countershaft side gear can be mounted on the countershaft without increasing the number of parts as in the conventional case. There is no need for press-fitting.

Further, in the transmission with an auxiliary transmission according to the present invention, the reduced-speed countershaft-side gear of the reduced-speed gear train of the auxiliary transmission portion has a meshing range with the reduced-speed output shaft-side gear supported on the output shaft. Extends to the counter shaft of the reduction gear output shaft side gear by extending and engraving to the part facing the high reduction gear switching mechanism provided on the output shaft between the reduction gear train and the high reduction gear train Then, the lubricating oil can be scraped up by the engraved portion and supplied to the high reduction speed switching mechanism.

[0018]

An embodiment of the present invention will be described below with reference to the drawings. 1 and 2 show an embodiment of the present invention. In FIG. 1, reference numeral 2 denotes a transmission with an auxiliary transmission mounted on a vehicle (not shown), 4 denotes a transfer, and 6 denotes a first transmission.
Reference numeral 8 denotes a second transmission case, 10 denotes a third transmission case, 12 denotes a transfer case, 14 denotes an input shaft, 16 denotes a counter shaft, 18 denotes an output shaft, and 20 denotes a transfer output shaft. The transmission 2 with an auxiliary transmission according to this embodiment is provided with a transfer 4 connected thereto.

In the transmission 2 with the auxiliary transmission, an input shaft 14 for inputting a driving force from an engine (not shown) is mounted on first and second transmission cases 6.8 by first and second input shaft bearings. 22.2
4 and a counter shaft 16 disposed in parallel with the input shaft 14 to the first to third cases 6 to 10 of the transmission.
The third output shaft 18 supported by the third countershaft bearings 26 to 30 and arranged in parallel with the countershaft 16 and coaxially with the input shaft 14 is mounted on the third case 10 and the transfer case 12 of the transmission. The first and second output shaft bearings 32 and 34 support the shaft.

The transmission 2 with the auxiliary transmission is provided with an output shaft 18.
Of the input shaft 14 is supported by a bearing 36, and a reverse idler shaft 38 is fixed to the first and second transmission cases 6, 8.

The transfer 4 includes a transfer output shaft 20 disposed in parallel with the output shaft 18 and a third transmission.
The first and second transfer output shaft bearings 40 and 42 support the case 10 and the transfer case 12.

The transmission 2 with a sub-transmission is provided with a main transmission 44
And an auxiliary transmission section 46. The main transmission unit 44 includes a first-speed to fourth-speed gear trains 48 to 54, which are a plurality of forward gear trains, and a single-stage reverse gear train 56 between the input shaft 14 and the counter shaft 16.
Are provided. The auxiliary transmission section 46 is provided with a reduced speed gear train 58 having a reduced speed ratio and a high reduction gear train 60 having a high reduction ratio between the counter shaft 16 and the output shaft 18.

The first-speed gear train 46 includes a first-speed input shaft side gear 62 fixed to the input shaft 14 and a first-speed counter shaft side gear 64 supported on the counter shaft 16. 2nd gear train 50
Consists of a second speed input shaft side gear 66 fixedly mounted on the input shaft 14 and a second speed counter shaft side gear 68 supported by the counter shaft 16. The third speed gear train 52 includes a third speed input shaft side gear 70 supported on the input shaft 14 and a third speed counter shaft side gear 72 fixed to the counter shaft 16. The fourth speed gear train 54 includes a fourth speed input shaft side gear 74 supported on the input shaft 14 and a counter shaft 16.
And a four-speed counter shaft-side gear 76 fixedly mounted on the shaft.

The first gear 2 is provided between the first gear 64 and the second gear 68 on the counter shaft 16.
A speed synchronization switching mechanism 78 is provided. The input shaft 14 is provided with a third-speed / fourth-speed synchronous switching mechanism 80 between a third-speed input shaft-side gear 70 and a fourth-speed input shaft-side gear 74. In addition, a synchronization switching mechanism 82 for direct connection is provided at the rear end of the input shaft 14 between the input shaft 14 and the front end of the output shaft 18.

The reverse gear train 56 includes a reverse input shaft side gear 84 fixed to the input shaft 18, a reverse counter shaft side gear 86 provided on the first speed and second speed synchronous switching mechanism 78 of the counter shaft 16, and a reverse idler shaft 38. And a reverse idler shaft side gear 88 which is axially movably supported.

The first to fourth speed gear trains 48 to 54 of the forward gear train of the main transmission portion 44 include a first-speed second-speed synchronous switching mechanism 78 and a third-speed fourth-speed gear train.
The first and fourth gears are selectively switched by the speed synchronization switching mechanism 80. The input shaft 14 and the output shaft 18 are switched to a direct connection / disconnection state by a direct connection synchronous switching mechanism 82. Further, the reverse gear train 56 is switched to a reverse meshing state by a reverse idler shaft side gear 88.

The reduction gear train 58 of the sub-transmission portion 46 is
A low reduction output shaft side gear 90 is provided to be supported on the output shaft 18,
A reduced speed counter shaft side gear 92 meshing with the reduced speed output shaft side gear 90 is integrally formed in the shaft diameter d of the counter shaft 16. This reduction speed counter shaft side gear 92
Exceed the range of engagement with the reduced-speed output shaft side gear 90 supported on the output shaft 18, and reduce the reduced-speed gear train 58 and the high-reduction gear train 6.
In the axial direction of the counter shaft 18, the extension portion 94 is integrally engraved to a position opposed to a later-described high reduction speed switching mechanism 100 provided on the output shaft 18 between 0 and 0.

The high reduction gear train 60 is provided with a high reduction output shaft side gear 96 pivotally supported on the output shaft 18, and a high reduction counter shaft side gear 98 meshed with the high reduction output shaft side gear 96. 16 is provided by spline fitting.

The output shaft 18 between the reduced speed output shaft side gear 90 and the high speed reduced output shaft side gear 96 is provided with a high reduced speed switching mechanism 100 for switching the high reduced speed ratio. The high reduction speed switching mechanism 100 includes a high reduction speed switching hub 10 attached to the output shaft 18.
2 is fixedly provided, and a high reduction speed switching sleeve 104 is provided on the high reduction speed switching hub 102 so as to be axially movable and non-rotatable.

The high-reduction speed switching mechanism 100 can switch to the meshing state of the low-speed gear train 58 by connecting the high-reduction speed switching sleeve 104 to the low-speed output shaft side gear 90 to obtain a reduced speed ratio. Also, the high reduction speed switching mechanism 1
In 00, the high reduction speed switching sleeve 104 is meshed with the high reduction output shaft side gear 96, whereby the high reduction gear train 60 can be switched to the meshing state to obtain a high reduction ratio.

Reference numeral 106 denotes a high reduction speed switching shaft, reference numeral 108 denotes a driving sprocket that is supported by the output shaft 18, reference numeral 110 denotes a driven sprocket fixed to the transfer output shaft 20, reference numeral 112 denotes a transfer chain,
Reference numeral 114 denotes a two-wheel / four-wheel switching mechanism.

The transfer 4 is connected to a drive sprocket 108 on an output shaft 18 by a two-wheel / four-wheel switching mechanism 114.
And the driving force is distributed from the output shaft 18 to the transfer output shaft 20 for output, and the two-wheel / four-wheel switching mechanism 114 causes the driving sprocket 108 to idle on the output shaft 18 so that the output shaft 18 Only outputs driving force.

As described above, the transmission 2 with the auxiliary transmission is
A main shaft provided with an input shaft 14, a counter shaft 16, an output shaft 18, and a plurality of stages of forward gear trains 1st to 4th gears 48 to 54 and a reverse gear train 56 between the input shaft 14 and the counter shaft 16; The transmission unit 44 includes a subtransmission unit 46 provided with a reduced speed gear train 58 having a reduced speed ratio and a high reduction gear train 60 having a high reduction ratio between the counter shaft 16 and the output shaft 18.

The transmission 2 with an auxiliary transmission includes an auxiliary transmission section 46.
The counter-side gear 92 of the reduced speed is integrally formed within the shaft diameter d of the counter shaft 16.

As a result, the transmission 2 with the auxiliary transmission can increase the distance between the counter shaft 16 and the output shaft 18,
The outer diameter of the reduced speed counter shaft side gear 92 can be reduced without reducing the shaft diameter of the counter shaft 16.

Therefore, in the transmission 2 with the auxiliary transmission, the outer diameter of the reduced-speed output shaft-side gear 90 can be increased by reducing the outer diameter of the reduced-speed countershaft-side gear 92. The gear ratio of the reduced speed gear train 58 of the portion 46 can be increased, and the counter shaft 16 and the output shaft 1
Since it is not necessary to increase the distance between the shafts 8 and to reduce the shaft diameter d of the counter shaft 16, it is possible to prevent the transmission 2 with the sub-transmission from being enlarged and the strength of the counter shaft 16 from being insufficient. In addition, the transmission 2 with the auxiliary transmission can be made compact and the strength of the counter shaft 16 can be ensured.

Further, in the transmission 2 with the auxiliary transmission, the reduced speed countershaft side gear 92 is integrally formed on the countershaft 16 so that the number of parts does not increase as in the prior art. Since the number of points can be reduced and the work of assembling the reduced speed countershaft side gear 92 to the countershaft 16 by press fitting is not required, it is possible to avoid improper assembling and erroneous assembling and improve gear accuracy. Noise can be reduced.

In the transmission 2 with the auxiliary transmission, the reduced-speed countershaft-side gear 92 is extended and engraved on the countershaft 16 to a portion facing the high-reduced-speed switching mechanism 100. The lubricating oil can be scraped up and supplied to the high reduction speed switching mechanism 100 by the extended portion 94 of the engraved portion.

As a result, the transmission 2 with the sub-transmission is
As shown in FIG. 2, the lubricating oil reservoir 11 in the third case of the transmission is provided.
No. 6 reduced speed counter shaft side gear 92 immersed in lubricating oil
By the rotation of the extension 94 of the part engraved by extending
High-reduction speed switching mechanism 1 on output shaft 18 side by scraping lubricating oil
00 can be supplied.

For this reason, the transmission 2 with the auxiliary transmission can improve the lubricating performance of the high reduction speed switching mechanism 100 and can improve the durability.

[0041]

As described above, the transmission with the auxiliary transmission according to the present invention can reduce the speed of the counter shaft without increasing the distance between the counter shaft and the output shaft or reducing the shaft diameter of the counter shaft. The outer diameter of the side gear can be reduced,
Unlike the conventional case, the number of parts does not increase, and there is no need to perform an operation of press-fitting the reduced-speed counter shaft side gear to the counter shaft.

For this reason, the transmission with the sub-transmission can increase the gear ratio of the reduced speed gear train of the sub-transmission portion.
Since there is no need to increase the distance between the counter shaft and the output shaft or to reduce the shaft diameter of the counter shaft, the size of the transmission with the sub-transmission and the strength of the The transmission with transmission can be made compact and the strength of the counter shaft can be secured, and the number of parts can be reduced.
By not requiring an assembling operation, it is possible to avoid an improper assembling or erroneous assembling, and it is possible to improve gear accuracy and reduce noise.

Further, the transmission with the auxiliary transmission according to the present invention can scrape up the lubricating oil and supply it to the high-reduction speed switching mechanism by the portion of the reduction-speed counter shaft-side gear that is extended and cut.

Therefore, the transmission with the sub-transmission can improve the lubricating performance of the high reduction speed switching mechanism and the durability.

[Brief description of the drawings]

FIG. 1 is a sectional view of a transmission with a sub-transmission showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a sectional view of a subtransmission unit of a transmission with a subtransmission showing a conventional example.

[Explanation of symbols]

 2 Transmission with auxiliary transmission 4 Transfer 14 Input shaft 16 Counter shaft 18 Output shaft 44 Main transmission section 46 Sub transmission section 48-54 1st-4th gear train 56 Reverse gear train 58 Low reduction gear train 60 High reduction gear train 90 Low reduction output shaft side gear 92 Low reduction counter shaft side gear 96 High reduction output shaft side gear 98 High reduction counter shaft side gear 100 High reduction speed switching mechanism 102 High reduction speed switching hub 104 High reduction speed switching sleeve

Claims (2)

[Claims] 1. An input shaft for inputting a driving force from an engine, a counter shaft disposed in parallel with the input shaft, a forward gear train and a reverse gear train between the input shaft and the counter shaft. A main transmission portion provided; an output shaft disposed parallel to the counter shaft and coaxial with the input shaft; and a reduced speed gear having a reduced speed ratio between the counter shaft and the output shaft. And a sub-transmission portion provided with a high-speed reduction gear train having a high reduction ratio, the sub-transmission portion includes a reduced-speed countershaft side gear of the reduced-speed gear train and the countershaft. A transmission with a sub-transmission, which is integrally engraved within the shaft diameter of the transmission. 2. The reduced-speed countershaft-side gear of the reduced-speed gear train of the sub-transmission portion extends beyond the meshing range with the reduced-speed output shaft-side gear supported on the output shaft. 2. The transmission with an auxiliary transmission according to claim 1, wherein the transmission is extended to a portion facing a high reduction speed switching mechanism provided on the output shaft between the high reduction gear train and the output shaft.