JPH09264245A - Bearing restricting device for swash plate type pump or for motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure good transmission of rotation between members provided with tilting angles. SOLUTION: In a swash plate type pump or a motor, in which a roller hearing supported in a supporting frame on a swash plate back face side is clamped, a holding rod 12 extending from the front side beyond the rotation center of a swash plate 1 toward the supporting frame 6 side for the roller bearing 3 is arranged, one end of the holding rod 12 is engaged in a notch 14 formed in the supporting frame 6 for the roller bearing 3, the intermediate part of the holding rod 12 is supported on the side face of the swash plate 1 freely rotationally, and the other end of the holding rod 12 is supported on the casing 10 inside face or in the casing lid part freely rotationally in the front side beyond the rotation center of the swash plate 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bearing regulating device for a swash plate type rotary piston pump or motor, and more particularly to a roller bearing holding means interposed between a swash plate and a supporting member.

[0002]

2. Description of the Related Art In a swash plate used for a swash plate type rotary piston pump or motor, for example, a back surface is formed in a semi-cylindrical shape, and a recess between the same shape formed in a rear support member and the back surface. There is a semi-cylindrical swash plate that is displaceably supported in the circumferential direction by interposing a roller bearing. In this case, it is necessary to properly hold the roller bearing between the swash plate and the support member so that the roller bearing does not slip or fall off due to vibration or shock. For this reason, for example, a holding rod 5 as shown in FIG. A supporting frame 6 is used (Jikkou 5-41268, etc.).

The support frame 6 is curved in an arc shape corresponding to the back surface portion 1A of the swash plate 1 and the concave surface portion 2A of the support member 2 and rotatably supports a plurality of roller bearings 3 inside.

The holding rod 5 has a base end rotatably attached to the side surface of the swash plate 1 via a pin 4. The support frame 6 is formed with a notch 7 that opens to the side, and the middle portion of the holding rod 5 is loosely engaged with the inside of the notch 7.

The tip portion 5A of the holding rod 5 is formed into a spherical shape or a horizontal cylindrical shape orthogonal to the axis of the holding rod 5,
The tip portion 5A is fitted into the guide hole 8 formed in the support member 2. The opening portion of the guide hole 8 is formed wide in the displacement direction of the swash plate 1 so as not to hinder the rotation of the rod 5.

When the swash plate 1 is rotated via the lever 9, the swash plate 1 is displaced along the concave surface portion 2A while rolling the roller bearing 3. Along with this, the holding rod 5 becomes
It is rotationally displaced about A as a fulcrum, guides the displacement of the support frame 6 while the intermediate portion of the holding rod 5 is displaced, and holds the support frame 6 at an intermediate position between the swash plate 1 and the support member which are relatively displaced.

Incidentally, the base end of the piston, which freely slides out of the cylinder, is in sliding contact with the smooth front surface of the swash plate 1 opposite to the rear surface 1A through a shoe.

[0008]

However, in such a conventional example, the guide hole 8 into which the front end portion 5A of the holding rod 5 is fitted in the rear surface support portion (support member 2) of the bearing 3.
Therefore, when the support frame 6 of the bearing 3 is provided at a deep position in the casing, it becomes difficult to machine the guide hole 8.

Further, since the holding rod 5 has a structure in which it slides in the guide hole 8 and swings at an arbitrary angle, it is necessary to make the tip portion 5A spherical or the like, which causes a problem that the cost of the holding rod 5 increases.

An object of the present invention is to improve the workability and the assemblability and to reduce the cost.

[0011]

SUMMARY OF THE INVENTION According to the present invention, the back surface of a swash plate that abuts on a rotating piston and drives the piston to expand and contract is formed in a semi-cylindrical shape. A swash plate pump or motor having a structure in which a roller bearing supported by a support frame is sandwiched between a back surface portion and a concave surface portion of a swash plate pump from a front side of a rotation center of the swash plate. A holding rod extending to the support frame side of the roller bearing is provided, one end of the holding rod is engaged with a notch formed in the support frame of the roller bearing, and the middle portion of the holding rod is rotatably supported on the side surface of the swash plate and held. The other end of the rod is rotatably supported on the inside surface of the casing or the casing lid portion on the front side of the rotation center of the swash plate.

[0012]

Therefore, since the supporting rod of the roller bearing is supported by supporting the holding rod on the inner surface of the casing or the side surface of the casing lid and the swash plate, it is not necessary to process the rear supporting portion (supporting member) of the bearing. Since one end is engaged with the notch formed in the support frame of the roller bearing, it is not necessary to process the end portion, and the support portion of the holding rod is provided on the side surface of the swash plate and the inside surface of the casing or the casing lid portion, that is, the swash plate. Since it is provided on the front side instead of the back side, the assembly becomes easy.

[0013]

1 to 4, reference numeral 1 denotes a swash plate having a semicylindrical rear surface 1A, and a supporting member 2 having a concave surface 2A of the same shape facing the rear surface 1A. It is supported via a plurality of roller bearings 3 and is rotated in the vertical direction in the figure by driving a lever 9.

The support member 2 is formed integrally with the casing 10. As shown in FIG. 5, a concave surface portion 2 is provided on a side portion of the casing 10.
A hole having substantially the same radius as A opens, and the casing lid 11 is attached to the opening.

The roller bearing 3 is rotatably supported inside a support frame 6 which is curved in an arc shape. A holding rod 12 is provided to hold the support frame 6 at an appropriate position between the swash plate 1 and the support member 2.

The holding rod 12 is longer than the rotation radius of the swash plate 1 and is a roller bearing from the front side of the rotation center a of the swash plate 1 (the side opposite to the support member 2 with respect to the rotation center a of the swash plate 1). 3 is formed to have a length reaching the support frame 6 side.

One end 12A of the holding rod 12 is located on the front side of the rotation center a of the swash plate 1 on the line passing from the center b of the concave surface 2A of the support member 2 to the rotation center a of the swash plate 1. It is rotatably supported by.

In this case, one end 12A of the holding rod 12
Is formed so as to be orthogonal to the axial direction of the rod, and is inserted into an attachment hole formed in the casing lid 11 to support it as a fixed rotation fulcrum.

The intermediate portion of the holding rod 12 is rotatably supported on the side surface of the swash plate 1 at a predetermined position passing through the center thereof.

In this case, the middle portion of the holding rod 12 is slidably inserted into a through hole formed in the pin 13 rotatably attached to the swash plate 1 to support it as a slidable rotation fulcrum.

The tip 12B of the holding rod 12 has a support frame 6
It is inserted into and engaged with the groove-shaped notch 14 formed in the side portion of the.

The one end 12A of the holding rod 12 can be formed by bending. Also, the holding rod 1
One end 12 </ b> A of 2 may be supported on the inner surface of the casing 10. Further, other configurations are the same as those of the conventional example.

Next, the operation will be described.

When the lever 9 is driven to rotate the swash plate 1 from the solid line position in FIG.
Guides the displacement of the support frame 6 that moves in the same direction as the swash plate 1 while displacing the intermediate portion downwardly in the figure with the one end 12A as a fixed rotation fulcrum and the distal end 12B of the holding rod 12 accordingly. To do.

The displacement of the intermediate portion in the axial direction of the rod due to the operation of the holding rod 12 escapes by the slidable rotation fulcrum.

The fixed rotation fulcrum of the holding rod 12 is used as the swash plate 1.
Since it is located on the front side of the rotation center a, the tip 12B of the holding rod 12 is approximately equivalent to the displacement of the support frame 6 as shown in FIG.
Can be displaced.

In this way, the support frame 6 is held at an intermediate position between the swash plate 1 and the support member 2 which are relatively displaced. Therefore, the support frame 6 that supports the roller bearing 3 does not change its position with respect to the swash plate 1 or the support member 2 due to vibration or the like, and does not fall out from between these.

Further, it is not necessary to provide a hole for the holding rod 12 in the supporting member 2, and the hole for supporting the holding rod 12 is provided in the casing lid 11 (or the inner side surface of the casing 10) and the side surface of the swash plate 1. Since it is sufficient, it is easy to process. Further, since the tip 12B of the holding rod 12 is simply inserted into the notch 14 of the support frame 6, there is no need to process the end portion of the holding rod 12, and if one end 12A of the holding rod 12 is bent, the holding rod 12 itself is processed. The cost is greatly reduced.

Assembling is performed after assembling the swash plate 1 and the support frame 6 into the casing 10 and then, for example, inserting the holding rod 1 into the through hole.
2 is inserted, the pin 13 is attached to the swash plate 1 (the tip 12B of the holding rod 12 is inserted into the notch 14 of the support frame 6), and one end 12A of the holding rod 12 is attached to the casing lid 1.
It suffices to fit it into the mounting hole 1 (or the inner surface of the casing 10), and the assembly is easy.

Next, in another embodiment shown in FIGS. 7 to 9, one end 20A of the holding rod 20 is attached to the casing lid 11.
(Or the inner surface of the casing 10) is supported as a rotation fulcrum that can be freely rotated within a predetermined angle and slidably in the rod axial direction, while the middle portion of the holding rod 20 is provided on the side surface of the swash plate 1. It is rotatably supported as a fixed fulcrum.

A receiving portion 22 for receiving the one end 20A side of the holding rod 20 in a groove 21 is attached to the casing lid 11, and the width of the groove 21 is increased to make a great play with the rod 20. The support rod 20 is slidably supported by the holding rod 20 and is allowed to freely rotate within a predetermined angle.

A mounting hole 23 is formed on the side surface of the swash plate 1,
The protrusion 24 formed in the middle portion of the holding rod 20 is attached to the mounting hole 2
By inserting it in 3, the middle part is rotatably supported.

In this way, the swash plate 1 and the holding rod 2 are
When 0 is attached (the tip 20B of the holding rod 20 is inserted into the notch 14 of the support frame 6), the holding rod 20 does not move around the rod axis and in the axial direction.
By fitting, the one end 20A side of the holding rod 20 enters the groove 21 of the receiving portion 22, and the assembling is extremely easy.

The projection 25 at the intermediate portion of the holding rod 20 may be formed by bending as shown in FIG. 10, which will further reduce the processing cost.

[0035]

As described above, according to the present invention, the holding rod extending from the front side of the rotation center of the swash plate to the supporting frame side of the roller bearing is provided, and one end of the holding rod is formed on the supporting frame of the roller bearing. The holding rod is rotatably supported on the side surface of the swash plate by engaging with the notch, and the other end of the holding rod is rotated to the inside surface of the casing or the casing lid portion in front of the rotation center of the swash plate. Since it is supported freely, it is not necessary to provide a support portion for the holding rod on the back side of the bearing, workability and assemblability are improved, cost can be reduced, and assembly of the swash plate pump and motor becomes easy.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing a first embodiment.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a partial perspective view.

FIG. 4 is a partial perspective view.

FIG. 5 is a schematic view of a casing.

FIG. 6 is a diagram showing a displacement trajectory.

FIG. 7 is a transverse cross-sectional view showing a second embodiment.

FIG. 8 is a partial perspective view.

FIG. 9 is a partially enlarged view.

FIG. 10 is a perspective view of an essential part showing a third embodiment.

FIG. 11 is a vertical sectional view of a conventional example.

[Explanation of reference symbols] 1 swash plate 1A rear surface 2 supporting member 2A concave surface 3 roller bearing 6 supporting frame 12 holding rod 12A one end 12B tip 13 pin 14 notch 20 holding rod 20A one end 21 groove 22 receiving portion 23 mounting hole 24, 25 Protrusion

Claims (1)

[Claims] 1. A back plate of a swash plate that abuts on a rotating piston and drives the piston to expand and contract is formed in a semi-cylindrical shape, and a support member having a concave surface part of the same shape is provided behind the back surface of the swash plate. , In a swash plate pump or motor having a structure in which a roller bearing supported by a support frame is sandwiched between the back surface portion and the concave surface portion, the roller bearing extends from the front side of the rotation center of the swash plate to the support frame side of the roller bearing. A holding rod is provided, one end of the holding rod is engaged with the notch formed in the support frame of the roller bearing, the middle portion of the holding rod is rotatably supported on the side surface of the swash plate, and the other end of the holding rod is attached to the swash plate. A bearing regulation device for a swash plate pump or a motor, which is rotatably supported by an inner surface of a casing or a casing lid portion in front of a rotation center.