JPH089430Y2 - Bearing control device for swash plate - Google Patents

Description

TECHNICAL FIELD The present invention relates to a swash plate type rotary piston pump and a motor, and more particularly to a holding means for a roller bearing interposed between a swash plate and a support member.

(Prior Art) In a swash plate type rotary piston pump or motor, the back part of the swash plate is formed in a semi-cylindrical shape, and a roller bearing is provided between the recess of the same shape formed in the rear support member and this back part. There is a semi-cylindrical swash plate that is displaceably supported in the circumferential direction by interposing (Japanese Patent Publication No. 60-45313).

In this case, the roller bearing is attached to the support frame and rolls along the recess of the support member while guiding the swash plate. Further, in order to guide the support frame, a freely rotatable pin is provided on the side surface of the support frame, and both ends of a guide that penetrates the pin in a freely slidable manner are rotatably locked to the swash plate and the support member, respectively. It

(Problem of the invention) However, in this pump (motor), it is necessary to assemble the support member, the support frame, and the swash plate together with the guide in advance, and then store them in the casing. There was a problem that the assembly work of was so troublesome.

On the other hand, the present applicant has previously proposed a guide as shown in FIG. 4 in Japanese Patent Application No. 63-133130. After loosely engaging the middle portion of the guide 10 whose one end is pin-connected to the swash plate 2 with the notch 7 formed in the support frame 6 from the side,
The other end formed into a spherical shape or a cylindrical shape is inserted into a guide hole 5 formed in the supporting member 4, and the supporting member 4 is fixed to the casing by this structure, and then the swash plate 2 and the supporting frame 6 are provided together with the guide 10. It can be assembled.

However, in the case of this guide 10, since a sphere or a ring is welded to the end portion, it takes time and labor for processing, and the guide hole 5
If the front and rear of the end of the guide 10 inserted into the guide hole 5 are not communicated with each other, the flow of the hydraulic oil in the guide hole 5 is hindered, resulting in resistance to displacement of the guide 10.

The present invention has been made to solve the above problems, and an object of the present invention is to simplify the structure of the guide of the bearing regulating device and to make the displacement thereof smoother.

(Means for Achieving the Object) The present invention relates to a swash plate of a swash plate type pump or motor having a semi-cylindrical rear surface, and a supporting member having a concave portion of the same shape facing the rear of the rear surface. , A support frame of the roller bearing sandwiched between them, which is rotatably coupled to one member, and is obliquely provided with a guide which is movably coupled to the other two members respectively in the axial direction and the rotational direction. In the plate bearing regulation device, the guide is formed of a rod-shaped member,
One end of which is curved in an annular shape and is rotatably coupled to a pin that is provided on the side surface of the swash plate, and the middle portion is loosely engaged with a notch formed in the support frame, and a guide hole is formed in the support member. The other end of a circularly curved guide having a diameter slightly smaller than the diameter of the guide hole was inserted inside the guide hole.

(Operation) Since the guide is made of a rod-shaped member whose both ends are curved, the guide can be easily processed and the swash plate pump or the entire motor can be easily assembled. Further, since the end of the guide inserted into the guide hole has an annular shape with a diameter slightly smaller than the guide hole, it slides along the inner wall of the guide hole without rattling as the swash plate rotates. As it moves and rotates, it does not block the guide hole, so that hydraulic oil can freely move in and out of the guide hole, and the displacement of the guide becomes smooth.

(Embodiment) FIGS. 1 to 3 show an embodiment of the present invention.

As shown in FIG. 1, the guide 1 is configured by using rod-shaped members whose both ends are curved in large and small annular shapes.

A pin 3 as shown in FIG. 2 is provided on the side surface of the swash plate 2, and a groove 3A that engages with the large-diameter curved portion 1A of the guide 1 is formed in the circumferential direction. The curved portion 1A engages with the groove 3A by elastically deforming so as to widen the opening.

On the other hand, the small-diameter curved portion 1B is formed in the support member 4 so as to face the back surface of the swash plate 2 and has a circular cross-section guide hole 5 shown in FIG.
The guide hole 5 is formed to have a diameter slightly smaller than that of the guide hole 5 so as to be freely slidably fitted inside. The other structure is the same as that of the swash plate pump shown in FIG.

 Next, the operation will be described.

Both ends of the guide 1 are curved in advance to form a large-diameter curved portion 1A and a small-diameter curved portion 1B. When assembling the pump, first, the large-diameter curved portion 1A of the guide 1 is elastically deformed and engaged with the outside of the groove 3A of the pin 3 of the swash plate 2. Also,
The support member 4 is fixed inside a casing (not shown). Then, the middle portion of the guide 1 is laterally engaged with the notch of the support frame of the roller bearing, the swash plate 2 is inserted into the casing, and the curved portion 1B of the guide 1 is inserted into the guide hole 5 of the support member 4. . This completes the assembly of the bearing control device. It is of course possible to first assemble the guide 1 together with the swash plate 2, the supporting member 4 and the supporting frame of the roller bearing and then to assemble it in the casing.

In the bearing regulating device assembled in this way, when the swash plate 2 is displaced in the direction of the arrow in FIG. 1, the guide 1 is rotationally displaced about the bending portion 1B as a fulcrum, and the bending portion 1B is guided by the bending portion 1B. It slides toward the entrance side of the hole 5. At this time, as shown in FIG. 3, a sufficient gap is secured between the curved portion 1B in which the end portion of the rod-shaped guide 1 is curved and the wall surface of the guide hole 5 so as not to hinder the flow of hydraulic oil. Therefore, the curved portion 1B is smoothly displaced without receiving the resistance of the hydraulic oil in the guide hole 5.

(Effects of the Invention) As described above, since the bearing restricting device of the present invention uses the guides whose both ends are curved in an annular shape, the guide can be easily processed and the opening of the curved portion at the end of the guide on the swash plate side is easy. It can be easily attached by elastically deforming so that the portion is pressed and expanded. Further, since the end portion inserted into the guide hole has an annular shape with a diameter slightly smaller than that of the guide hole, it slides along the inner wall of the swash plate along the inner wall of the guide hole without rattling. While rotating, the guide is smoothly displaced without obstructing the circulation of the hydraulic oil in the guide hole, so that the load on the guide can be reduced.

[Brief description of drawings]

FIG. 1 is a side view of a guide showing an embodiment of the present invention, FIG. 2 is a view taken along the line AA in FIG. 1, and FIG. 3 is a view taken along the line BB. Further, FIG. 4 is a side view of a bearing regulation device showing a conventional example. 1 ... Guide, 1A, 1B ... Curved part, 2 ... Swash plate, 3 ... Pin, 4
... Support member, 5 ... Guide hole.

Claims (1)

[Scope of utility model registration request] 1. A swash plate of a swash plate type pump or motor having a semi-cylindrical rear surface, a support member having a concave portion of the same shape facing the rear of the rear surface, and sandwiched between these members. In a bearing regulation device of a swash plate, which is rotatably connected to any one member of a support frame of a roller bearing, and is connected to two other members so as to be respectively displaceable in the axial direction and the rotational direction, Is composed of a rod-shaped member,
One end of which is curved in an annular shape and is rotatably coupled to a pin that is provided on the side surface of the swash plate, and the middle portion is loosely engaged with a notch formed in the support frame, and a guide hole is formed in the support member. A bearing regulating device for a swash plate, characterized in that the other end of a guide curved in an annular shape having a diameter slightly smaller than the diameter of the guide hole is inserted inside the guide hole.