JPS61116153A - Speed change-over unit - Google Patents

Abstract

PURPOSE:To shorten the wheel base of a vehicle, by arranging a first clutch, a second clutch and a third clutch on the axially opposite side of a drive gear. CONSTITUTION:A first clutch 14, a second clutch 17 and a third clutch 19 are arranged on the axially opposite side of a second gear 16. Therefore, they do not interfere with each other in the direction of wheel base of a vehicle irrespective of the dimensions of the drive gear or the second gear. Accordingly, the diameterical dimension of the drive gear 12 or the second gear 16 may be set to be less than that of any one of the first, second and third clutches 14, 17, 19 so that the wheel base may be made to be short.

Description

Detailed Description of the Invention [Objective of the Invention] (Industrial Application Field) The present invention relates to an improvement in a transmission, and particularly to a transmission mechanism with two forward speeds and one reverse speed or one forward speed and two reverse speeds. Used for industrial vehicles such as forklifts.

(Prior art) As a prior art related to the present invention, Japanese Patent Application Laid-Open No. 59-11094
There is one in Publication No. 7. As shown in FIG. 2, the H drive gear 112 fixed to the input shaft 111,
L drive gear 113 freely rotatably disposed above. The L drive gear 113 and the input shaft 111 are rotatably coupled together, and the R drive gear 115 is rotatably disposed on the input shaft 111. An R clutch 116.degree. that can connect the R drive gear 115 and the input shaft 111 so as to be rotatable together; an intermediate shaft 118 that meshes with the L drive gear 113 and fixes the intermediate gear 117; H intermediate gear 119. which is rotatably disposed on intermediate shaft 118 and meshes with H drive gear 112. An H clutch 120 that can connect the H intermediate gear 119 and the intermediate shaft 118 such that they can rotate together. Intermediate output gear 121 fixed to intermediate shaft 118
．． The transmission is composed of an output shaft 123 having an output gear 122 that meshes with an intermediate output gear 121 and an R drive gear 115, and has two forward speeds (H and L) and one reverse speed (R).

(Problems to be Solved by the Invention) This prior art has the following problems. That is,
Since the L clutch 114 and the H clutch 120 are located at a position where they interfere in the axial direction, it is necessary to separate the shafts 111 and 118 so that they do not interfere, which increases the distance between the shafts and reduces the capacity of the entire transmission in the shaft direction. It was getting bigger.

The technical object of the present invention is to solve the above-mentioned problems of the prior art and to reduce the capacitance in the direction between the shafts. [Structure of the Invention] (Means for Solving the Problems) The technical measures taken to solve the technical problems are:
Drive shaft, drive gear fixed to the drive shaft.

A first gear rotatably disposed on the drive shaft, a first clutch capable of connecting the first gear and the drive shaft so as to be integrally rotatable, a second gear disposed parallel to the drive shaft and meshing with the drive gear; a second clutch capable of integrally rotatably connecting the second gear and the first intermediate shaft; a third gear rotatably disposed on the first intermediate shaft;
A third clutch that can connect the gear and the first intermediate shaft so as to be integrally rotatable.

A second intermediate shaft that fixes a fourth gear that meshes with the second gear and a fifth gear that meshes with the third gear, and a sixth gear that is fixed to the first intermediate shaft.
The transmission includes an output shaft having a gear, a sixth gear, and an output gear that meshes with the first gear, and a first clutch, a second clutch, and a third clutch are arranged on the opposite side in the axial direction with respect to the drive gear. It is to compose.

(effect) The above technical means works as follows.

The first system of power transmission is by connecting the first clutch,
Input shaft - 1st clutch - 1st gear output gear output shaft, and the 2nd system connects the 2nd clutch, input shaft - drive gear 2nd gear 2nd clutch - 1st intermediate shaft -
The 6th gear output gear becomes the output shaft, and the 3rd system connects the 3rd clutch, input shaft → drive gear 2nd gear → 4th gear → 2nd intermediate shaft - 5th gear → 3rd gear 3rd clutch -First intermediate shaft-Sixth gear output gear output shaft. Here, the first clutch, the second clutch, and the third clutch are arranged on the opposite side in the axial direction with respect to the second gear. Therefore, the first clutch, the second clutch and the third clutch
A clutch does not interfere with the drive gear and the second gear in the direction of the distance between the shafts, regardless of their size. Therefore, the drive gear or the second gear is connected to the first clutch or the second gear.
1 (Embodiment) This invention can be set smaller in the radial direction than the clutch or the third clutch, and the distance between the shafts can be shortened.Hereinafter, the present invention will be described with reference to an embodiment.

In FIG. 1, a forward drive gear 12 is fixed to an input shaft 11, and a reverse reverse gear 13, which is a first gear, is rotatably fitted. Reverse gear 13 and input shaft 11
The R clutch 14, which is the first clutch, enables integral rotation of the R clutch 14. A forward shaft 15, which is a first intermediate shaft arranged parallel to the input shaft 11, has a second forward gear, which is a second gear.
Forward H gear 16 for stage, and forward first gear which is the third gear.
A forward L gear 18 for each stage is fitted so as to be freely rotatable, and the forward upper gear 16 is always in mesh with the drive gear 12. An H clutch 17 which is a second clutch and a third clutch 19 which enable the forward upper gear 16 and the forward L gear 18 to rotate integrally with the forward shaft 15 are disposed on the forward shaft 15. . The H clutch 17 and L clutch 18 are
The R clutch 14 is located on the opposite side in the axial direction with respect to the meshing position between the drive gear 12 and the forward upper gear 16. An idle shaft 2 which is a second intermediate shaft is parallel to the forward shaft 15.
2, which fixes an idle H gear 20 which is a fourth gear that always meshes with the forward upper gear 16, and an idle L gear 21 which is a fifth gear that always meshes with the forward L gear 18. A forward final gear 23, which is a sixth gear, is fixed to the forward shaft 15. A first output gear 24 that constantly meshes with the forward final gear 23 and the reverse gear 13 is fixed to the first output shaft 25 . Furthermore, a second output gear 26. Second output shaft 28. A third output gear 27 is incorporated.

In the above configuration, when the first forward stage is activated, the L clutch 1
By operating input shaft 9, power is transmitted to input shaft 11-
Drive gear 12 - forward H gear 16 - idle H gear 20 - idle shaft 22 - idle L gear 21 → forward L gear 18 → L clutch 19 - forward shaft 15 - forward final gear 23 - first output gear 24. The output shafts reach the output shaft systems 25, 26, 27, and 28. When the second forward stage is in operation, by operating the H clutch 17, the power is transmitted as follows: input shaft 11 - drive gear 12 -> forward H gear 16 -> H clutch 17 - forward shaft 15 ->
This is done in the order of forward final gear 23 - first output gear 24 and reaches output shaft systems 25, 26 and 27, 28.

During reverse operation, by operating the R clutch 14, power is transmitted in the order of the input shaft 11 → R clutch 14 - reverse gear 13 → first output gear 24, and the output shaft system 2
It reaches 5.26, 27.28. In the above, the diameter of the drive gear 12 and the forward upper gear 16 is the diameter of the R clutch 14.
Even if the distance between the shafts 11 and 15 becomes smaller than the diameter of the R clutch 14 and the H clutch 17, the R clutch 14 and the H clutch 17 will not interfere.

In Fig. 1, the output shaft system is divided into the first output shaft 25 and the second output shaft 25.
Output gear 26. Third output gear 27. Although it is configured with the second output shaft 28, only the first output shaft 15 may be used.

Also H clutch 17. L clutch 19. Forward upper gear 16. Forward L gear 18. Idle H gear 20.
The idle L gear 21 may be reversed.

Furthermore, in order to create a transmission with one forward speed and two reverse speeds, the reverse system 13 and 14 in Fig. 1 should be changed to one forward speed, and the forward H,
The L system 12.15 to 23 may have two reverse speeds.

(Effect of the invention) The present invention has the following unique effects.

Generally, due to the structure of the transmission, oil pools occur around the input shaft, so in the conventional technology, the L clutch 114 and the R clutch 11
The two clutches in the No. 6 engine are soaked in oil, and the resistance due to the oil is large, resulting in a loss of horsepower.

In contrast, in the present invention, since only one first clutch is provided around the input shaft, there is less resistance due to oil and less horsepower loss.

[Brief explanation of drawings]

FIG. 1 shows a gear train of a transmission with two forward speeds and one reverse speed according to the present invention, and FIG. 2 shows a gear train of the prior art. 11... Input shaft, 12... Drive gear, 13... Reverse gear (first gear), 14... R clutch (first
clutch), 15...forward shaft (first intermediate shaft),
16...Forward upper gear (2nd gear), 17...
H clutch (second clutch), 18...forward L
Gear (3rd gear), 19...L clutch (3rd clutch). 20...Idle upper gear (4th gear), 21...Idle L gear (5th gear), 22...Idle shaft (2nd gear)
intermediate shaft), 23...forward final gear (sixth
gear), 24...first output gear, 25...first output shaft

Claims (1)

[Claims] a drive shaft, a drive gear fixed to the drive shaft, a first gear rotatably disposed on the drive shaft, a first clutch capable of connecting the first gear and the drive shaft so as to be integrally rotatable; a first intermediate shaft disposed parallel to the drive shaft; a second gear rotatably disposed on the first intermediate shaft and meshing with the drive gear;
a second clutch capable of connecting a gear and the first intermediate shaft so as to be integrally rotatable; a third gear rotatably disposed on the first intermediate shaft; and a third gear and the first intermediate shaft integrally connected. a third clutch that can be rotatably engaged; a fourth clutch that meshes with the second gear;
a second gear that fixes the gear and a fifth gear that meshes with the third gear;
an intermediate shaft; a sixth gear fixed to the first intermediate shaft;
A transmission comprising an output shaft including a gear and an output gear that meshes with the first gear, and the first clutch and the second clutch are disposed on opposite sides in the axial direction with respect to the drive gear.