JPS6320863Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a swash plate support device that rotatably supports the swash plate of a swash plate type variable displacement pump.

Generally, in order to reduce the swaying frictional resistance of the swash plate, the bearings of this type of swash plate support device use arc-shaped roller bearings with the convex cylindrical guide of the swash plate as the inner ring and the concave cylindrical guide of the machine body as the outer ring. However, such roller bearings can gradually shift position and come off the raceway due to free movement caused by vibration of the swash plate and elastic deformation of the rollers. If a stopper is used to prevent this, the swash plate will slide on the rollers that do not roll after the roller bearing abuts against the stopper during the rotation of the swash plate, resulting in large frictional forces and damage to the bearing. Therefore, a proposal has been made to insert a rod 5 freely moving back and forth into a pivot 4 rotatably provided on one roller 2 of a roller bearing 1 and a swash plate 3, as shown in Figure 1, and one end of the rod is bent and inserted into a hole 7 of the machine body 6. In this type, the rod 5 rotates around the hole 7 by the rotation of the roller 2 and the pivot 4 due to the rotation of the swash plate 3, so that the roller bearing 1 follows the swash plate 3.

However, if the rollers 2, which cannot be rolled by the rods 5, are made the same diameter as the rollers 8 of the roller bearing 1, sliding friction will occur and early damage will occur.To avoid this, if the rollers 2 are made smaller in diameter than the rollers 8, the bearing function will be improved. As a result, the load shared by other rollers increases and the roller bearing becomes larger. In addition, this roller bearing had the disadvantage of being expensive due to the special structure in which the rods were assembled.

The purpose of the present invention is to improve the above-mentioned drawbacks, and the present invention uses a convex cylindrical guide part as an inner ring between the convex cylindrical guide part of the swash plate and the corresponding concave cylindrical guide part of the fuselage. An arc-shaped roller bearing with a concave cylindrical guide as an outer ring is installed, and the roller bearing is supported at both ends by a support part provided on the fuselage and the swash plate, with the intermediate part abutting the roller bearing end, and both ends supported by support parts provided on the fuselage and the swash plate. The device is characterized in that a resilient stopper is provided that allows rotation and movement in the longitudinal direction.

The present invention will be specifically described below based on embodiments shown in the drawings. In FIG. 2, 11 is the drive shaft of the swash plate type variable displacement pump (output shaft when used as a hydraulic motor), 12 is the cylinder block pivotally attached to the drive shaft 11, and 13 is the cylinder block 1.
A piston 14 is fitted into the piston 2, and a swash plate 14 is a swash plate on which a shoe 15 attached to the piston 13 slides and rotates.
The convex cylindrical guide part 16 is opposed to the concave cylindrical guide part 18 of the body 17, and an arc-shaped roller is formed between the convex cylindrical guide part 16 as an inner ring and the concave cylindrical guide part 18 as an outer ring. A bearing 19 is interposed.

Furthermore, in this embodiment, stoppers 21 are disposed at both ends of the roller bearing 19, with the intermediate portions abutting against the ends of the roller bearing 19, or facing each other with a slight gap therebetween. This stopper 21 has one end rotatably attached to a support shaft 22 that is pivoted to the swash plate 14, and the other end that comes into contact with the roller bearing side of a support shaft 23 that is pivoted to the fuselage 17. The positions of and 23 are selected so that the stopper 21 is along the end face of the roller bearing 19, which moves substantially synchronously with the swash plate 14. However,
The stopper 21 is a plate with moderate elasticity, and the roller bearing 1 is caused by vibration of the swash plate 14, elastic deformation of the rollers, etc.
The free movement of the roller bearing 9 is counteracted by the pushing back force generated by the elastic deformation of the stopper, thereby regulating the amount of movement of the roller bearing.

Since this embodiment has the above-described configuration, when the swash plate 14, which is at the maximum tilt angle position shown in the figure, is rotated clockwise in order to reduce the pump discharge flow rate, the roller bearing 19 is rotated by the stoppers 21 at both ends thereof. It moves synchronously with the swash plate 14 while being held in place. Therefore, the amount of movement of the roller bearing 19 is
Since the roller bearing 19 rolls by half the amount of movement of the convex cylindrical guide surface 24 of No. 4, no sliding friction force is generated. Furthermore, the free movement of the roller bearing 19 due to vibration of the swash plate 14 is restricted by the stoppers 21 on both sides, so the problem of misalignment of the roller bearing 19 is solved.

The one shown in FIG. 4 is another embodiment of the stopper 25, in which the intermediate portion 26 is brought into contact with the end of the roller bearing 19, both sides of which are bent at right angles in opposite directions, and one end is bent at right angles. The bent portion 27 is inserted into the radial groove 28 of the swash plate 14.
The other end 29 is inserted into a horizontal hole 31 of a support shaft 30 rotatably fitted into the body 17. Therefore, the position of the groove 28 and the support shaft 30 is determined by the stopper 25.
is selected so that it follows the end face of the roller bearing 19 which moves substantially in synchronization with the swash plate 14.

In this embodiment, as the swash plate 14 rotates, the bent portion 27 of the stopper 25 is inserted into the groove 27 of the swash plate 14.
The roller bearing 19 is clamped by the stoppers 25 at both ends of the roller bearing 19 because the intermediate portion 26 slides on the top and the other end rotates around the support shaft 30 and moves in the length direction so that the intermediate portion 26 follows the end of the roller bearing 19. It moves synchronously with the swash plate 14 in such a manner. Therefore, the same effect as the embodiment shown in FIG. 2 can be obtained.

As explained above, in the present invention, the roller bearing moves synchronously with the swash plate while being held by a pair of stoppers located on both sides of the roller bearing, so that the roller bearing is not damaged by sliding frictional force. Furthermore, since the free movement of the roller bearings is restricted, the problem of misalignment of the roller bearings is solved. Further, since the roller bearing does not require the installation of a stopper or the like, it can be manufactured in a small size and at low cost.

[Brief explanation of the drawing]

Fig. 1 is a side view of the conventional product, Fig. 2 is a side view showing the embodiment of the present invention, and Fig. 3 is A--A in Fig. 2.
4 is a side view showing another embodiment of the present invention, and FIG. 5 is a sectional view taken along line B--B in FIG. 4. 12...Cylinder block, 14...Swash plate, 1
6... Convex cylindrical guide part, 17... Body, 18... Concave cylindrical guide part, 19... Roller bearing, 21, 25...
Stopper, 22, 23, 30... Support shaft, 28...
groove.

Claims (1)

[Scope of utility model registration request] An arc-shaped roller bearing is interposed between the convex cylindrical guide part of the swash plate and the corresponding concave cylindrical guide part of the body, with the convex cylindrical guide part as the inner ring and the concave cylindrical guide part as the outer ring. In the above-mentioned roller bearing, elastic stoppers are provided at both ends of the roller bearing, the intermediate portions of which abut against the roller bearing ends, and both ends of which are supported by support portions provided on the fuselage and the swash plate to enable rotation and longitudinal movement. A swash plate support device for a swash plate type variable displacement pump, characterized in that: