JP2519002Y2 - Vehicle power transmission - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to an improvement of a power transmission device for a vehicle, and more particularly to a power transmission device for vehicles such as passenger cars, freight cars, and industrial vehicles.

[Problems to be Solved by Prior Art and Invention] Generally, in this type of power transmission device, a transmission shaft supported by bearings fitted and fixed in holes of adjacent wall plates of a housing is installed. There is one in which power transmission is performed through a plurality of gears and a speed change sleeve mounted on the transmission shaft. In this case, since the plurality of gears and the speed change sleeve are generally arranged between the bearings, conventionally, in the step of inserting the transmission shaft into the bearings inside the housing, the gears, spacers, Often, individual parts such as retaining rings were assembled.

In this case, the assembly work involves supporting the individual gears, spacers, etc. with one hand, aiming at the center, and inserting the transmission shaft with the other hand and fixing the gear with a retaining ring. However, since many obstacles such as bearing support walls are narrow in the housing, free movement of the hand inside the housing is hindered, and assembly is often difficult.

[Means for Solving Problems] The present invention has been devised in order to solve these problems in view of the actual situation as described above. It is arranged between the bearing, which is fitted and fixed, and the transmission shaft, which is inserted into the bearing so as to be rotatable around the axis and is fastened with a nut at the tip of the insertion to prevent it from being pulled out. In forming a power transmission device including a plurality of gears and a speed-changing sleeve for transmitting power to the power-transmitting shaft by being inserted into the power-transmitting shaft in a state where the plurality of gears and the speed-changing sleeve are A cylinder shaft assembly is attached to a cylinder shaft having a length extending between both bearings, the cylinder shaft assembly is arranged between both bearings, and a transmission shaft is spline-fitted to the arranged cylinder shaft assembly. It is characterized by that.

Further, the present invention is configured in this manner so that a plurality of gears and speed change sleeves can be easily assembled.

[Embodiment] An embodiment of the present invention will be described with reference to the drawings. A power take-off mechanism which extends a drive shaft 3 for transmitting the power of the engine 1 through a main clutch 2 rearward and is located behind the tractor 4 in the body of the vehicle. A drive shaft 6 of No. 5 and a joint 7 are spline-connected, and a transmission mechanism 8 for traveling is arranged at an intermediate portion between the engine 1 and the power take-off mechanism 5.

The drive shaft 6 supports a gear 14 which is supported by walls A and B of a housing 11 via bearings 9 and 10 and which is fixed by a retaining ring 12 and slides on a spline portion 13. The seal cap 15 is press-fitted into the housing 11. The PTO shaft 16 serving as a transmission shaft is the wall body A, B
It is supported by bearings 17 and 18 fitted in the holes of the spline hub and fixed in position by retaining rings 19 and 20. ) 21 is splined. Spline part of spline hub 21 22
A sleeve 23 is fitted into the groove 23, and a spring 25 is incorporated into the groove 24 so that the groove 23 is positioned in the inclined groove 26 of the spline hub 21.

A gear 27 is provided at both ends of the sleeve 23, an internal gear 29 of the gear 28,
It has a gear 30 that meshes with 29. The gear 27 is supported by a bearing 32 fixed by a snap ring 31 and fixed in position by a snap ring 33.
The gear 28 is supported by a bearing 35 fixed by a retaining ring 34. The gear 36 is supported by a bearing 38 fixed by a retaining ring 37, sandwiches a spacer 39, and is fixed by a retaining ring 40.

PTO shaft 16 has bush 41 and bearing 1 between the rear stepped part
8, the nut 4 at the front end across the spline hub 21 and the bearing 17
It is tightened at 4 and crimped to prevent loosening. An O-ring 42 is attached to the bush 41, and an oil seal 43 is press-fitted into the wall B to maintain oil tightness with the outside.
The lower part of the housing 11 has an intermediate gear 63, MI that meshes with the gear 36.
A MIDPTO case assembly 45 incorporating the DPTO gear 64 and MIDPTO shaft 65 is mounted. A piece 47 having an operating arm 46 fitted therein acts on the sleeve 23, and the gear 14
A piece 49 in which an operation arm 48 is fitted acts on the.

The operation arm 46 is an external operation lever as shown in FIG.
50 and spline connection and fixed with retaining ring 51, operation arm
48 is an operating lever 52 that penetrates the axis of the operating arm 46 and is externally operated.
It is fixed by the width across flats and fixed in position by the retaining ring 53.

The operating levers 50 and 52 project to the side of the seat 54 and guide
Move the groove of 55. The drive shaft 6 has a gear 56.

The power that has passed through the engine 1 and the main clutch 2 is transmitted to the drive shaft 3, and is transmitted to the drive shaft 6 by the joint 7 of the spline joint.

The drive shaft 6 is integral with the gear 56, and the gear 14 is fitted on the spline thereof. Gear 56 is a spline hub
Since the gear 27 supported by the bearing 32 on the 21 and the gear 14 always mesh with the gear 28 supported by the bearing 35 on the spline hub 21, the gear 27 is always connected when the main clutch 2 is connected. And the gear 28 will rotate.

A sleeve 23 is spline-fitted to the spline portion 22 on the same spline hub 21 so as to be slidable, and by sliding the sleeve 23 back and forth on the spline hub 21 by an operating lever 50, The gear 27 or the internal gear 29 of the gear 28 and the sleeve 23 are engaged with each other, and the spline hub 21
PTO fitted with spline provided on the inner diameter side of
The shaft 16 can be shifted in two steps.

On the other hand, on the spline hub 21, the gear is located close to the gear 28.
36 is supported by the bearing 38 and normally does not rotate, but the gear 28 and the gear 36 are configured with the same number of teeth, and when the gear 14 slides on the drive shaft B6, both gears 28, 36 are simultaneously rotated. Since the gear 14 is configured to have a sufficient width to cover the tooth width, the gear lever 14 is slid forward by the operating lever 52 to be meshed with the gear 36, so that the gear 36 and the intermediate gear 63 are interposed. MI
Rotate DPTO gear 64 and spline fit with it
Power is transmitted to MIDPTO axis 65. When the gear 14 is slid backward and the relationship with the gear 36 is broken, the rotation of the MIDPTO shaft 65 stops. In a sense, the gear 14 serves as a clutch for the MIDPTO shaft 65.

Neutral / shift operation by the sleeve 23 and this MIDPTO
Since it can be performed at the same time as the clutch switching operation of,
Depending on the combination of lever operations, only PTO axis 16 and MIDPTO axis 65
Only, or both PTO shafts 16 and 65 can be rotated simultaneously.

At the time of assembly, first, the MIDPTO case assembly 45 is attached to the housing 11 from below the housing 11. Next, the bearing 17 is fitted into the hole of the wall plate A inside the casing 11 and fixed by the retaining ring 19, and the necessary gears, bearings, sleeves, and retaining rings are incorporated into the spline hub 21 from above. While holding down the spline hub assembly (corresponding to the cylinder shaft assembly of the present invention) with one hand, spline the PTO shaft 16 incorporating the bearing 18, bush 41, and O-ring 42 from the rear with another hand. After the bearing 18 is fitted into the hole of the wall plate B inside the housing 11 so as to aim at the centers of the hub 21 and the bearing 17,
The bearing 18 may be fixed to the wall plate B with the retaining ring 20, tightened with the fixing nut 44 from the front, and the oil seal 43 may be inserted from the rear end.

At this time, holding the spline hub assembly with one hand in the deep portion of the narrow housing 11 is not only heavy as an assembly work but also difficult, but with this one,
It can be easily assembled by temporarily engaging the gear 36 with the intermediate gear 63 protruding upward from the side of the already assembled MIDPTO case assembly 45, and mounting it.

Finally, install around the upper drive shaft 6 and seal cap 15
Is pressed in to complete the assembly of the power take-out mechanism 5 inside the housing 11.

The spline hub 21 has a cutout portion 59 in the central portion, and an oil groove 60 and a spline cutout portion 60a at both ends.

Since the PTO shaft 16 has an oil hole 61 in the center and the portion corresponding to the cutout portion 59 of the spline hub 21 is cut out of the spline to form an oil sump 62, rotation of the PTO shaft 16 causes the oil hole 61 The lubricating oil is sucked up by centrifugal force and stored in the oil sump 62.
The inner diameter splines of the PTO shaft 16 and the spline hub 21 are lubricated and flow out from the oil groove 60.

Further, since the spring 25 that elastically acts on the inclined groove 26 provided in the spline portion 22 of the spline hub 21 is incorporated in the groove portion of the sleeve 23, the sleeve 23 can be accurately held at the neutral position. Spring 25 when shifting
Has a structure in which it can move along the inclined portion of the inclined groove 26 and can slide in the outer radial direction of the spline portion 22 while having an elastic action. 57 and 58 are O-rings.

[Advantageous Effects] In short, since the present invention is configured as described above, a plurality of gears and gears for transmitting power to a transmission shaft supported by bearings between adjacent wall plates are provided. The sleeve is not directly attached to the transmission shaft in the housing as in the conventional case, but is attached to the cylinder shaft to which the transmission shaft is spline-fitted and assembled in the cylinder shaft assembly.

As a result, the plurality of gears and speed change sleeves required for power transmission to the transmission shaft are installed in the outside of the housing in advance as a cylinder shaft assembly, and are arranged between the bearings, while the transmission shaft is installed at the center of the cylinder shaft. Assembling can be performed by inserting the bearing of the transmission shaft in the state of spline fitting, and tightening the penetration tip end with a nut.

Moreover, since the cylindrical shaft that constitutes the assembly has a length that extends between both bearings, the cylindrical shaft is positioned only by inserting the transmission shaft, and the shaft is inadvertently moved in the axial direction to disengage the gear mesh. As a result, the work of assembling while inserting the transmission shaft through the individual parts in a narrow housing is no longer required as in the conventional case, improving workability and facilitating assembly. It was

[Brief description of drawings]

FIG. 1 is a detailed view of the power take-off mechanism of the present invention, FIG. 2 is a relationship diagram of a gear shift and a clutch lever, FIG. 3 is a guide plate, and a fourth.
5 and FIG. 5 are views of a spring and its mounting, FIG. 6 is a transmission mechanism view, FIG. 7 is an overall view of a tractor, and FIG. 8 is a detailed view of essential parts. In the figure, 11 is a housing, 16 is a PTO shaft, 17 and 18 are bearings, 21 is a spline hub, 23 is a sleeve, 14, 27, 28, 29, 30, 36,
56, 63 and 64 are gears, and 65 is a MIDPTO shaft.

Continuation of front page (56) Bibliography Sho 57-105419 (JP, U) Japan Society of Mechanical Engineers "Mechanical Drawing Rolling Bearings" (Sho 44-7-20) Japan Society of Mechanical Engineers P. 14

Claims (1)

(57) [Scope of utility model registration request] 1. Bearings (17, 18) fitted and fixed in holes of adjacent wall plates (A, B) of a housing (11), and the bearing (1).
7, 18) and a bearing shaft (17, 18), which is rotatably pivoted around the shaft, and has a nut (44) at its tip to secure the shaft (16). In configuring a power transmission device including a plurality of gears and a speed-changing sleeve that are inserted between the transmission shaft (16) and are transmitted between the transmission shaft (16) to transmit power to the transmission shaft (16), The plurality of gears and the speed change sleeve are attached to a cylinder shaft (21) having a length extending between the bearings (17, 18) to form a cylinder shaft assembly, and the cylinder shaft assembly is arranged between the bearings (17, 18). A power transmission device for a vehicle, wherein the power transmission device is arranged, and a transmission shaft (16) is spline-fitted to the arranged cylinder shaft assembly.