JP5893268B2 - Hydraulic motor or hydraulic pump - Google Patents

Description

  The present invention relates to a hydraulic motor or a hydraulic pump used in a construction vehicle such as a hydraulic excavator.

  In the hydraulic motor or the hydraulic pump, the retainer plays a role of holding a plurality of shoes and pressing the shoes in the swash plate direction. Since this retainer is subjected to a force that causes the shoe to move away from the swash plate, the retainer needs to have sufficient rigidity. On the other hand, reducing the thickness of the retainer is also an important issue in order to reduce the size of the hydraulic motor or the hydraulic pump or to reduce the manufacturing cost of the retainer.

  As a technique in this field, for example, there is one described in Patent Document 1. In the axial piston device described in Patent Document 1, an additional disk 61 is fastened to the outer peripheral side of the retainer disk 24 (retainer), and the thickness of the outer peripheral side of the retainer disk 24 is increased to the cylinder body 4 side. It is described that the additional disk 61 increases the strength of the retainer and extends the useful life.

Special table 2009-542966 gazette

  However, as in Patent Document 1, in the configuration in which another member is fastened to the retainer, it is necessary to secure the rigidity of the fastening portion, and there is a problem that the thickness of the retainer cannot be reduced. Further, since the additional disk 61 is disposed between the slide block 12 and the cylinder body 4 (the shoe and the cylinder block), the additional disk 61 and the additional disk 61 may be used in a state where the piston enters the cylinder bore 9 (inside the cylinder). There is also a problem that the cylinder body 4 interferes. In order to avoid interference, it is necessary to dispose the cylinder body 4 at a position away from the swash plate 13, but in this case, the axial piston device becomes longer in the axial direction.

  This invention is made | formed in view of the said subject, The objective is to provide the hydraulic motor or hydraulic pump provided with the retainer which heightened intensity | strength and was thinned.

  In order to solve the above-described problems, a hydraulic motor or a hydraulic pump according to the present invention includes a case, a rotating shaft housed in the case, a cylinder block attached to the rotating shaft, and an axis center of the cylinder block. A plurality of cylinder holes drilled in the axial direction of the cylinder block, a piston slidably disposed with respect to an inner wall surface of the cylinder hole, a shoe provided at a tip of the piston, and the shoe A swash plate having a slope that slides, and an annular retainer that holds the plurality of shoes and presses the shoes against the slope, and a retainer disk portion plane on the entire outer peripheral edge of the retainer. The collar part which cross | intersects is formed integrally.

  According to this structure, the intensity | strength of the whole retainer can be raised with the collar part provided in the outer peripheral part. Further, since the collar portion is formed integrally with the retainer, sufficient rigidity is secured at the outer peripheral edge portion, and the retainer can be formed thin. Therefore, the manufacturing cost of the retainer can be reduced. Furthermore, the thinner the cylinder block, the closer to the swash plate side, and the shorter the axial direction of the hydraulic motor or hydraulic pump.

  Moreover, in this invention, it is preferable that the said collar part is arrange | positioned outside the outer peripheral surface of the said cylinder block.

  According to this configuration, since there is no possibility that the flange portion and the cylinder block interfere with each other, it is possible to prevent the hydraulic motor or the hydraulic pump from being elongated in the axial direction by disposing the cylinder block at a position away from the swash plate. .

  In the present invention, the retainer includes a disk part into which the rotating shaft and the plurality of shoes are inserted, and an extension part formed on an outer peripheral part of the disk part, and the flange part is the extension part. It is preferable that they are integrally formed over the entire circumference of the outer peripheral edge.

  According to this structure, the extension part provided in the outer peripheral part of the disk part can enlarge the diameter of a retainer, and can prevent that a collar part interferes with a cylinder block.

  ADVANTAGE OF THE INVENTION According to this invention, the hydraulic motor or hydraulic pump provided with the retainer with high intensity | strength and thin thickness can be provided by forming a collar part integrally in the outer peripheral edge part of a retainer. Accordingly, the manufacturing cost of the retainer can be reduced, and the hydraulic motor or the hydraulic pump can be shortened in the axial direction.

Sectional drawing of the hydraulic motor which concerns on one Embodiment of this invention (A) is a front view of the retainer shown in FIG. 1, (b) is a right side view of (a). (A) is the A section expanded sectional view of the hydraulic motor shown in FIG. 1, (b) is the B section expanded sectional view.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. The hydraulic motor or the hydraulic pump according to the present invention is a hydraulic motor or a hydraulic pump used for a traveling device in a construction vehicle such as a hydraulic excavator. In addition, it is not limited to the use for construction vehicles. The hydraulic motor or the hydraulic pump according to the present invention can be used in common for both the hydraulic motor and the hydraulic pump. In the following description, a case where the hydraulic motor or the hydraulic pump is used particularly for the hydraulic motor will be described as an example.

(Configuration of hydraulic motor)
FIG. 1 is a cross-sectional view of a hydraulic motor 1 according to an embodiment of the present invention. As shown in FIG. 1, the hydraulic motor 1 includes a case 2, a rotating shaft 3, a cylinder block 4, a piston 5, a shoe 6, a swash plate 7, a retainer guide 8, a retainer 10, and the like.

(Case and rotating shaft)
The case 2 is for housing the rotating shaft 3, the cylinder block 4, the piston 5, etc., and the rotating shaft 3 is held rotatably with respect to the case 2.

(Cylinder block)
The cylinder block 4 is spline-coupled to the rotating shaft 3 and is attached to the rotating shaft 3 so as to be movable in the axial direction X of the rotating shaft 3 and to rotate together with the rotating shaft 3 in the rotating direction of the rotating shaft 3. ing. A plurality of cylinder holes 4 a are formed in the axial direction around the axis of the cylinder block 4. These cylinder holes 4a are arranged at equal intervals on the same circumference. The cylinder hole 4 a is formed in the cylinder block 4 so that its longitudinal direction is parallel to the axial direction X.

(Piston and shoe)
Plural pistons 5 are provided, and are inserted into the cylinder holes 4a so as to be slidable with respect to the inner wall surface of the cylinder hole 4a. The tip of the piston 5 has a sphere 5a, and a shoe 6 is attached to the sphere 5a.

(Swash plate)
The swash plate 7 has a slope 7a, and the shoe 6 is slidably in contact with the slope 7a. By supplying pressure oil to each cylinder hole 4a of the cylinder block 4, the piston 5 inserted into each cylinder hole 4a is pushed out to the swash plate 7 side. Then, with the movement of the piston 5, the shoe 6 rotates while sliding on the slope 7 a of the swash plate 7. The cylinder block 4 is rotated by the rotation of the shoe 6, and the rotating shaft 3 is rotated integrally with the cylinder block 4.

(Retainer guide and retainer)
The retainer guide 8 is attached to the rotary shaft 3 and is disposed closer to the swash plate 7 than the cylinder block 4. The retainer guide 8 is urged toward the swash plate 7 by a spring 9 incorporated in the cylinder block 4 to support the retainer 10. The retainer guide 8 may be formed integrally with the cylinder block 4. The retainer 10 is supported by the retainer guide 8 and presses the plurality of shoes 6 against the inclined surface 7 a while holding the plurality of shoes 6.

(Retainer structure)
Next, the structure of the retainer 10 is demonstrated based on FIG. 1 and FIG. 2A is a front view of the retainer 10, and FIG. 2B is a right side view of FIG. The retainer 10 is made of a thin metal plate material, and is formed over the entire circumference of the disk portion 11, the extension portion 12 formed on the outer peripheral portion of the disk portion 11, and the outer peripheral edge portion of the extension portion 12. It has a flange 13 that is orthogonal to the plane 10a (hereinafter referred to as plane 10a), and a flange 14 that is formed over the entire inner peripheral edge of the disk portion 11 and intersects the plane 10a.

  The disk portion 11 has a through hole 15 into which the rotary shaft 3 is inserted at the center, and a plurality of shoes 6 are inserted outside the through hole 15 at the same radial position with a fixed angular interval. A shoe insertion hole 16 is formed. An extension portion 12 having the same thickness as the disk portion 11 and extending from the outer periphery along the plane 10 a is provided on the outer periphery of the disk portion 11. And the collar part 13 orthogonal to the plane 10a is provided in the outer peripheral part of the extension part 12. As shown in FIG. The flange 13 extends in a direction opposite to the inclined surface 7a of the swash plate 7 in a state where it is attached to the hydraulic motor 1 (see FIG. 1). In addition, the collar part 13 does not need to be orthogonal to the plane 10a, and may be provided so that it may just cross | intersect the plane 10a.

  Moreover, the collar part 14 which cross | intersects the plane 10a is provided in the inner peripheral part of the disc part 11 over the perimeter of an edge part. The flange portion 14 extends in the direction opposite to the flange portion 13 in the disk portion 11, that is, in the state of being attached to the hydraulic motor 1, in the direction of the inclined surface 7 a of the swash plate 7 (see FIG. 1), and the retainer guide 8. Abut. The retainer 10 configured as described above is manufactured by pressing. First, the disk part 11, the extension part 12, and the collar parts 13 and 14 are integrally formed by pressing from a metal thin plate material, and the through hole 11 and the shoe insertion hole 12 are continuously formed.

  Thus, since the retainer 10 is provided with the collar part 13 orthogonal to the plane 10a, the strength of the retainer 10 as a whole can be increased. Moreover, since the collar part 13 is formed integrally with the extension part 12, sufficient strength can be secured near the boundary between the extension part 12 and the collar part 13, and the thickness of the disk part 11 and the extension part 12 can be increased. It becomes possible to make it thin compared with the conventional retainer (for example, patent document 1). Furthermore, by reducing the thickness of the disk part 11 and the extension part 12, it becomes possible to manufacture a retainer that has been manufactured by conventional turning with a press process that is easy to process, thereby reducing the manufacturing cost of the retainer. it can. In addition, since the collar part 14 is provided also in the inner peripheral part of the disk part 11, the intensity | strength of the retainer 10 whole can be raised more. Furthermore, since the collar part 14 is provided in the disk part 11 in the direction opposite to the collar part 13, the strength of the retainer 10 as a whole can be effectively increased.

  Further, since the thickness of the disk portion 11 and the extension portion 12 can be reduced, the cylinder block 4 can be disposed closer to the swash plate 7 than in the prior art, and the axial length of the hydraulic motor 1 can be increased. Can be shortened. Further, since the flange 13 has the same shape (length h and thickness t) on the entire outer peripheral edge of the extension 12, even if the retainer 10 rotates as the shoe 6 slides, The stirring resistance of the oil filled in the case 2 by the portion 13 does not increase significantly.

  FIG. 3A is an enlarged view of a portion A in FIG. As shown in FIG. 3A, the inner peripheral surface 13 a of the flange portion 13 is disposed outside the outer peripheral surface 4 b of the cylinder block 4. This is because the outer diameter of the retainer 10 is increased by the extension portion 12 provided on the outer peripheral portion of the disk portion 11. Thus, since the inner peripheral surface 13a of the flange portion 13 is disposed outside the outer peripheral surface 4b of the cylinder block 4, for example, the piston 5 enters deep into the cylinder 4a (see FIG. 3A). ) Even if the distance between the retainer 10 and the tip 4c of the cylinder block 4 is closest, the flange 13 and the cylinder block 4 do not interfere with each other.

  FIG. 3B is an enlarged view of a portion B in FIG. As shown in FIG. 3B, the height h of the flange portion 13 is the distance x from the plane 11a including the surface of the disc portion 11 facing the cylinder block 4 to the center point 5b of the spherical portion 5a of the piston 5. Longer than the distance y from the flat surface 11a to the tip of the shoe 6.

  In addition, the collar part 13 may be formed in the shape (wave shape) in which the peak part and the trough part were located in a line with the outer peripheral edge part of the extension part 12 as a center line. By forming the flange 13 in such a wave shape, the strength of the retainer 10 as a whole can be further increased.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made as long as they are described in the claims.

  For example, in the present embodiment, the flange portion 13 is formed on the outer peripheral edge portion of the extension portion 12 provided on the outer peripheral portion of the disc portion 11, but the extension portion 12 may not be provided, and the outside of the disc portion 11 may be omitted. The collar part 13 may be formed in the peripheral part. Moreover, although the collar part 14 is provided in the inner peripheral part of the disc part 11, the collar part 14 does not need to be provided.

1: Hydraulic motor 2: Case 3: Rotating shaft 4: Cylinder block 5: Piston 6: Shoe 7: Swash plate 8: Retainer guide 9: Spring 10: Retainer 11: Disk part 12: Extension part 13, 14: Gutter part 15 : Through hole 16: Shoe insertion hole

Claims (2)

A case filled with oil inside ,
A rotating shaft housed in the case;
A cylinder block attached to the rotating shaft;
A plurality of cylinder holes drilled in the axial direction of the cylinder block around the axis of the cylinder block;
A piston slidably disposed with respect to the inner wall surface of the cylinder hole;
A shoe provided at the tip of the piston;
A swash plate having a slope on which the shoe slides;
An annular retainer that holds the shoes and presses the shoes against the slope;
With
The retainer is
A disk portion into which the rotating shaft and the plurality of shoes are inserted;
An extension formed on the outer periphery of the disk portion;
All around the outer peripheral edge portion of the extension portion, said extension portion and the flange portion that will be formed integrally with crossing the retainer disc unit plane,
With
The inner peripheral surface of the flange portion, and face the outer peripheral surface of the disposed radially outward from the outer peripheral surface of the cylinder block Rutotomoni the cylinder block,
The flange portion in the portion where the inner peripheral surface of the flange portion and the outer peripheral surface of the cylinder block face each other approaches the outer peripheral surface of the cylinder block from the proximal end side to the distal end side of the flange portion,
The shape of the collar part is the same in the entire circumference of the collar part ,
Hydraulic motor or hydraulic pump. The hydraulic motor or hydraulic pump according to claim 1,
The distance from the plane including the surface facing the cylinder block side of the disk part to the tip of the flange part is longer than the distance from the plane to the center point of the spherical part of the piston,
Hydraulic motor or hydraulic pump.

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