JPH0587282U - Power transmission device to pump input shaft - Google Patents

Abstract

(57) [Summary] [Purpose] The spline portion between the transmission shaft and the input shaft of the pump can be sufficiently lubricated to reliably prevent wear of the spline portion. [Structure] A pair of bearings in the axial direction is provided in a cylindrical bearing case 33.
A cylindrical transmission shaft 29 is rotatably supported around the shaft center via 34 and 35, and an input shaft 38 of the pump 26 is spline-fitted to the transmission shaft 29 so as to pump the rotation of the transmission shaft 29. In the power transmission device for the pump input shaft adapted to transmit to the input shaft 38 of 26, the grease 42 is housed on the proximal end side of the input shaft 38 in the transmission shaft 29, and on the input shaft 38 side of the transmission shaft 29. An oil passage 44 is provided that connects the spline fitting portion with the bearings 34, 35 in the bearing case 33.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a power transmission device for a pump input shaft.

[0002]

[Prior Art]

 As shown in FIG. 6, the power transmission device to the pump input shaft supports a cylindrical bearing case 51 with a cylindrical transmission shaft 54 rotatably around the shaft center through a pair of axial bearings 52, 53. In the conventional model, the input shaft 56 of the pump 55 is spline-fitted to the transmission shaft 54 by internal spline fitting so that the rotation of the transmission shaft 54 is transmitted to the input shaft 56 of the pump 55. Applied grease to the spline parts of the transmission shaft 54 and the input shaft 56 in order to prevent wear of the spline parts.

[0003]

[Problems to be solved by the device]

 However, in the conventional case, since the spline portion was simply coated with grease, the spline portion was insufficiently lubricated, and the spline portion was worn. In view of the above-mentioned problems, the present invention is capable of sufficiently lubricating the spline portion between the transmission shaft and the input shaft of the pump, and reliably preventing wear of the spline portion.

[0004]

[Action]

 At room temperature, the oil passage hole 44 of the transmission shaft 29 serves as a grease reservoir so that the grease 42 can be sufficiently supplied to the spline portion. Also, at high temperature, due to centrifugal force, the grease 42 stored on the proximal end side of the input shaft 38 in the transmission shaft 29 moves on the spline portion and is spattered outward from the oil passage hole 44. 42 can effectively lubricate the spline portion.

[0005]

【Example】

 The present invention will now be described with reference to the illustrated embodiment. In FIGS. 2 to 4, reference numeral 1 denotes a steering device for the front wheels of a tractor, which is of a fully hydraulic type and is operated by a steering controller operated by a steering wheel. Oil can be supplied to the double-acting double rod hydraulic cylinder 4.

A front axle frame 3 is projected forward from the engine 11 constituting the tractor body, and this front axle frame 3 has left and right side frames 3A and a front frame 3B, and the inside thereof is a space. . The front axle frame 3 supports the front axle case 2 via a center pin support 12 so as to be swingable around a center pin 14. Final reduction gears 15 are provided on both left and right ends of the front axle case 2 so as to be rotatable around kingpins, and front axles 16 are supported through the final reduction gears 15, and front wheels (steering wheels) are attached to the front axles 16. 6 is attached.

A cylinder body 21 of a hydraulic cylinder 4 is bolted to a lower front portion of the left and right frames 3A of the front axle frame 3 via a receiving base 20. The hydraulic cylinder 4 is arranged in parallel with the front axle case 2, the piston rod 5 is inserted into the cylinder body 21 whose both ends are closed, and both ends of the piston rod 5 project left and right from the cylinder body 21.

Bifurcated portions at both ends of the connecting body 8 are fitted to the left and right ends of the piston rod 5, and are fixed by a grooved nut 22. The connecting body 8 is a U-shaped plate in a plan view, and a midway portion thereof is located outside the hydraulic cylinder 4 and parallel to it, and is movable left and right according to the operation of the piston rod 5. A bracket 23 forming a connecting portion 8A is fixed to the back surface of the connecting body 8, and one end of each of the left and right tie rods 7 is pivotally connected to the bracket 23 via a tie rod end. The other ends of the left and right tie rods 7 are connected to the left and right final reduction gears 15, respectively. The left and right tie rods 7 have substantially the same length, and a turnbuckle 24 is provided on at least one of the left and right tie rods 7 so that the length can be adjusted to perform toe-in adjustment and the like.

When the left and right protrusion amounts of the piston rod 5 of the hydraulic cylinder 4 are substantially the same and the front wheel 6 is in a straight posture, the bracket 23 (connecting portion 8A) is located at the center of the left and right side frame 3A in the left and right direction, One end of each of the tie rods 7 is located at the center of the front axle frame 3 in the width direction, and the pair of left and right has substantially the same length as the front axle case 2. The height of one end of the tie rod 7 is substantially the same as that of the center pin 14.

Since the left and right tie rods 7 are long, it is possible to follow the swing of the front axle case 2 without causing any twisting, and one end thereof is substantially flush with the center pin 14, which makes it more bendable. Is getting lost. There is a relatively large space in the front part of the front axle frame 3, in which a hydraulic pump 26 is housed and arranged via a mounting base 25 fixed to the left and right frames 3A. Power is transmitted to the hydraulic pump 26 from the crankshaft of the engine 11 via the first transmission shaft 27, the flexible joint 28, and the second transmission shaft 29, and supplies pressure oil to the steering controller and others.

FIG. 1 shows the structure of a power transmission device for the input shaft of the hydraulic pump 26. In the figure, a cylindrical bearing case 33 is placed and fixed on the mount 25, and a second cylindrical transmission shaft 29 is mounted on the bearing case 33 through a pair of axial bearings 34, 35. It is supported around the heart. A cylindrical distance collar 36 is provided between the bearings 34 and 35 so as to be fitted onto the second transmission shaft 29 with a gap. The input shaft 38 of the hydraulic pump 26 is spline-fitted to the second transmission shaft 29 so as to transmit the rotation of the second transmission shaft 29 to the input shaft 38.

A belt plug 39 is provided at the end of the second transmission shaft 29 on the side of the flexible joint 28, whereby a proximal end side of the input shaft 38 in the second transmission shaft 29 is a grease storage portion 41. The grease 42 is stored in. Further, a space between the bearings 34 and 35 in the bearing case 33 is called a grease storage portion 43, and the grease 42 is stored therein. An oil passage hole 44 is provided on the input shaft 38 side of the second transmission shaft 29 so as to communicate from the spline fitting portion to the bearings 34 and 35 in the bearing case 33, that is, the grease accommodating portion 43. An oil hole 45 is provided in the distance collar 36 so as to correspond to the oil passage hole 44.

FIG. 5 shows another embodiment, in which the second transmission shaft 29 is provided with an air escape hole 47 for communicating the grease storage portion 41 with the outside. The other points are the same as those in the above-mentioned embodiment. Although the distance collar 36 is provided between the bearings 34 and 35 in the above-described embodiment, the distance collar 36 may be omitted, and the bearings 34 and 35 may be provided on the second transmission shaft 29 such as a retaining ring or an engagement ring. The protrusions or the like may restrict the movement of the bearings 34, 35 in the axial direction with respect to the second transmission shaft 29.

[0014]

[Effect of the device]

 According to the present invention, the grease 42 is housed in the transmission shaft 29 on the proximal end side of the input shaft 38, and on the input shaft 38 side of the transmission shaft 29, from the spline fitting portion to the bearing 34, Since there is an oil passage hole 44 that communicates with each other, the oil passage hole 44 is used as a grease reservoir to supply sufficient grease to the spline section from this point, or to use the input shaft 38 in the transmission shaft 29 as a base. The grease 42 stored on the end side can be blown outward from the oil passage hole 44 through the spline portion by centrifugal force. Therefore, the grease can be smoothly supplied to the spline portion, the spline portion can be sufficiently lubricated, and wear of the spline portion can be reliably prevented. Moreover, by causing a grease flow in the spline portion when the temperature rises, it is possible to effectively prevent oxidative wear of the spline portion.

[Brief description of drawings]

FIG. 1 is a side sectional view of an essential part showing an embodiment of the present invention.

FIG. 2 is a side sectional view of a front end portion of a tractor.

FIG. 3 is a plan view of a front end portion of the tractor.

FIG. 4 is a front sectional view of a front end portion of the tractor.

FIG. 5 is a side sectional view showing another embodiment.

FIG. 6 is a side sectional view showing a conventional example.

[Explanation of symbols]

 26 Hydraulic pump 29 Second transmission shaft 33 Bearing case 34 Bearing 35 Bearing 38 Input shaft 44 Oil passage

Claims (1)

[Scope of utility model registration request] 1. A cylindrical bearing case (33) has a cylindrical transmission shaft (29) rotatably supported around a shaft center through a pair of bearings (34), (35) in the axial direction. Pump (26) on shaft (29)
The input shaft (38) of the
In the power transmission device for the pump input shaft, which is configured to transmit the rotation of 9) to the input shaft (38) of the pump (26), apply grease to the proximal end side of the input shaft (38) in the transmission shaft (29). (42) is housed in the transmission shaft (29) on the side of the input shaft (38). 44) A power transmission device for a pump input shaft, characterized in that the power transmission device is provided.