JP5682687B1 - Hydraulic device - Google Patents

Abstract

A hydraulic device that can be manufactured at low cost and can be easily assembled is provided. A first annular groove is provided on a peripheral surface of a swash plate support. Further, a second annular groove 117 facing the first annular groove 116 is provided on the peripheral surface of the recess 114 into which the swash plate support 106 is fitted. A retaining ring 112 is engaged with each of the first and second annular grooves 116 and 117. Thereby, the movement of the swash plate support member 106 in the axial direction can be restricted without fixing the swash plate support 106 to the recess 114 with the mounting bolt. [Selection] Figure 3

Description

  The present invention relates to a hydraulic device such as a variable displacement hydraulic pump, a fixed displacement hydraulic pump, a variable displacement hydraulic motor, a fixed displacement hydraulic motor, and the like.

  Conventionally, as a hydraulic device, there is a hydraulic pump provided with a swash plate support arranged in a bottomed cylindrical housing (see, for example, JP-A-11-351134 (Patent Document 1)).

  The swash plate support supports the swash plate so as to be tiltable. A piston that reciprocates in the housing faces the swash plate in the axial direction.

  The swash plate support is fitted into a recess provided on the inner surface of the bottom of the housing. More specifically, the swash plate support is inserted into the housing through an opening on the side opposite to the bottom side of the housing and fits into the recess. And an attachment bolt is inserted and tightened in the through-hole provided in the said swash plate support plate, and the movement of the axial direction of a swash plate support plate is controlled.

JP 11-351134 A

  However, in the above-described conventional hydraulic pump, since the axial movement of the swash plate support plate is restricted by the mounting bolt, it is necessary to provide a screw hole on the bottom surface of the recess.

  Therefore, the hydraulic pump has a problem that the processing cost of the housing increases and the manufacturing cost increases.

  Further, when the movement of the swash plate support plate in the axial direction is restricted by a mounting bolt, a long tool is used and the mounting bolt is tightened from the opening opposite to the bottom side of the housing.

  Therefore, the hydraulic pump requires a long tool for tightening the mounting bolt, and there is a problem that the assembly is troublesome.

  Accordingly, an object of the present invention is to provide a hydraulic device that can be manufactured at low cost and that can be easily assembled.

In order to solve the above problems, the hydraulic device of the present invention is:
A bottomed cylindrical housing;
A rotating shaft rotatably provided in the housing;
A plurality of pistons provided in the housing so as to be rotatable around the rotation axis and reciprocating with rotation around the rotation axis;
A reaction force receiving member accommodated in the housing and receiving a reaction force for reciprocating the piston;
The housing has a recess in the bottom surface where the reaction force receiving member is fitted,
The circumferential surface of the reaction force receiving member is provided with a first annular groove,
The peripheral surface of the recess is provided with a second annular groove facing the first annular groove,
The first, wire to each of the second annular groove is engaged,
A through hole penetrating from the outer surface of the housing to the inner surface;
The through hole communicates with the first and second annular grooves,
A first abutting member extending in a radial direction between the circumferential surface of the reaction force receiving member and the circumferential surface of the recess;
A second abutted member inserted into the through hole;
With
One end of the wire is in contact with the first contacted member, while the other end of the wire is in contact with the second contacted member .

  Here, the “reaction force receiving member” refers to, for example, a member having an inclined surface that is inclined with respect to the axial direction, or a member that supports the member in a tiltable manner.

  According to the said structure, when the said wire engages with each of the 1st, 2nd annular groove, the movement of the axial direction of a reaction force receiving member can be controlled, for example, without using a mounting bolt. Accordingly, since it is not necessary to provide a screw hole in the concave portion, the processing of the housing is reduced, and the manufacturing can be performed at low cost.

Further, since the mounting bolts need not be used, a long tool used at the time of assembling the conventional hydraulic pump need not be used, and can be easily assembled.
In addition, since the through hole communicates with the first and second annular grooves, the reaction force receiving member is fitted in the concave portion, and the second annular groove is opposed to the first annular groove, and then the wire is used. A wire rod can be engaged with each of the first and second annular grooves through the through holes into the first and second annular grooves.
Further, one end portion of the wire rod contacts the first contacted member, while the other end portion of the wire rod contacts the second contacted member. Thereby, the movement of the said wire in the circumferential direction can be controlled.

In the hydraulic device of one embodiment,
A contacted member extending in the radial direction is provided between the peripheral surface of the reaction force receiving member and the peripheral surface of the recess,
The wire is bent in an annular shape so as to surround the reaction force receiving member, and one end and the other end are in contact with the contacted member.

  According to the embodiment, the wire is bent in an annular shape so as to surround the reaction force receiving member, and one end and the other end are in contact with the contacted member. Thereby, the movement of the said wire in the circumferential direction can be controlled.

In the hydraulic device of one embodiment,
The wire is bent at one end and the other end, and the one end and the other end are substantially parallel to the radial direction,
A stop tube is provided to surround one end and the other end of the wire.

  According to the embodiment, since the stopper tube surrounds one end and the other end of the wire, it is possible to prevent the one end and the other end of the wire from being separated from the contacted member. Therefore, the effect of regulating the movement of the wire in the circumferential direction can be enhanced.

In the hydraulic device of one embodiment,
The depth of the first annular groove is greater than or equal to the radial width of the wire.

  According to the embodiment, when the radial force inner member of the wire rod is fitted into the first annular groove of the reaction force receiving member and then the reaction force receiving member is fitted into the recess, the reaction force receiving is received in the recess. During the operation of fitting the members, when the first annular groove is not opposed to the second annular groove, the depth of the first annular groove is equal to or greater than the radial width of the wire. The inner and radially outer portions can be accommodated in the second annular groove. As a result, the reaction force receiving member can be smoothly fitted in the recess.

In the hydraulic device of one embodiment,
The depth of the second annular groove is equal to or greater than the radial width of the wire.

  According to the embodiment, after fitting the radially outer portion of the wire in the second annular groove of the recess, and then fitting the reaction force receiving member into the recess, the reaction force receiving member is placed in the recess. During the fitting operation, when the second annular groove is not opposed to the first annular groove, the depth of the second annular groove is equal to or greater than the radial width of the wire. The radially outer portion can be accommodated in the first annular groove. As a result, the reaction force receiving member can be smoothly fitted in the recess.

In the hydraulic device of one embodiment,
The sum of the depth of the first annular groove and the depth of the second annular groove is substantially equal to the radial width of the wire.

  According to the embodiment, since the sum of the depth of the first annular groove and the depth of the second annular groove is substantially equal to the radial width of the wire rod, rattling of the reaction force receiving member can be reduced. .

  According to the hydraulic device of the present invention, the circumferential surface of the reaction force receiving member is provided with the first annular groove, and the circumferential surface of the recess has the second annular groove facing the first annular groove. Since the wire is engaged with each of the first and second annular grooves, the axial movement of the reaction force receiving member can be restricted without using, for example, a mounting bolt. Therefore, since it is not necessary to provide a screw hole in the concave portion into which the reaction force receiving member is fitted, the processing of the housing is reduced, and the manufacturing can be performed at low cost.

  Further, since the mounting bolts need not be used, it is not necessary to use a long tool used in assembling the conventional hydraulic pump, and the assembly can be easily performed.

FIG. 1 is a schematic sectional view of a swash plate type variable displacement hydraulic pump according to a first embodiment of the present invention. FIG. 2 is a schematic sectional view taken along the line II-II in FIG. FIG. 3 is an enlarged view of a portion in a circle C1 in FIG. FIG. 4 is a schematic view for explaining the fitting of the swash plate support material to the recess of the first embodiment. FIG. 5 is another schematic diagram for explaining the fitting of the swash plate support material to the recess of the first embodiment. FIG. 6 is another schematic diagram for explaining the fitting of the swash plate support material to the recess of the first embodiment. FIG. 7 is a schematic sectional view of a swash plate type variable displacement hydraulic pump according to a second embodiment of the present invention. FIG. 8 is a schematic cross-sectional view taken along line VIII-VIII in FIG. FIG. 9 is an enlarged view of a portion in a circle C2 in FIG. FIG. 10 is a schematic view for explaining the fitting of the swash plate support material to the recess of the second embodiment. FIG. 11 is another schematic diagram for explaining the fitting of the swash plate support material to the concave portion of the second embodiment. FIG. 12 is another schematic diagram for explaining the fitting of the swash plate support material to the concave portion of the second embodiment. FIG. 13 is a schematic sectional view of a swash plate type variable displacement hydraulic pump according to a third embodiment of the present invention. FIG. 14 is a schematic sectional view of the fixed displacement hydraulic pump of the first to third modifications.

  Hereinafter, the hydraulic apparatus of the present invention will be described in detail with reference to the illustrated embodiments.

[First Embodiment]
FIG. 1 is a schematic view of a cross section of a swash plate type variable displacement hydraulic pump according to a first embodiment of the present invention taken along a plane parallel to the axial direction.

  The swash plate type variable displacement hydraulic pump includes a bottomed cylindrical housing 101, a rotating shaft 102, a cylinder block 103, a plurality of pistons 104, a swash plate 105, and a swash plate support as an example of a reaction force receiving member. And a table 106.

  The housing 101 includes a bottom portion 101a and a peripheral side portion 101b that is provided integrally with the bottom portion 101a and continues to the peripheral edge portion of the bottom portion 101a. An insertion hole 113 for inserting the rotating shaft 102 is provided in the bottom 101a. In addition, a recess 114 into which the swash plate support 106 is fitted is provided on the inner surface of the bottom 101a. That is, the housing 101 has a concave portion 114 into which the swash plate support 106 is fitted on the inner surface of the bottom portion 101a. On the other hand, a support plate 107 is fixed to the outer surface of the bottom 101 a of the housing 101 with bolts 108. The support plate 107 rotatably supports the rotating shaft 102 via a bearing 109.

  The rotating shaft 102 is inserted into the insertion hole 113 and is rotatably supported by the housing 101 via a bearing 109.

  The cylinder block 103 is accommodated in the housing 101 and rotates integrally with the rotating shaft 102. The cylinder block 103 is provided with a plurality of cylinder holes 115 extending in the axial direction.

  Each of the pistons 104 is accommodated in the cylinder hole 115 so as to be slidable in the axial direction. As a result, the piston 104 rotates around the rotating shaft 102 and reciprocates in the cylinder hole 115 as the cylinder block 103 rotates. That is, the piston 104 reciprocates in the cylinder hole 115 as the rotation about the rotation shaft 102 occurs. Further, one end of each piston 104 on the swash plate 105 side is provided in a spherical shape, and a shoe 111 is attached to be tiltable.

  The swash plate 105 is accommodated in the housing 101 and has a sliding surface 105a on which the shoe 111 slides. The sliding surface 105a is inclined with respect to the axial direction. The inclination angle of the sliding surface 105a with respect to the axial direction can be arbitrarily changed by tilting the swash plate 105 with an actuator (not shown). In addition, an insertion hole 151 through which the rotation shaft 102 is inserted is provided at the center of the swash plate 105.

  The swash plate support 106 is provided to receive a reaction force for reciprocating the piston 104, and supports the swash plate 105 so as to be tiltable. An insertion hole 161 through which the rotating shaft 102 is inserted is provided at the center of the swash plate support 106. The swash plate support 106 is fitted in the recess 114.

  FIG. 2 is a schematic sectional view taken along the line II-II in FIG. FIG. 3 is an enlarged view of a portion surrounded by a circle C1 in FIG.

  As shown in FIGS. 2 and 3, a first annular groove 116 is provided on the peripheral surface of the swash plate support 106. On the other hand, a second annular groove 117 facing the first annular groove 116 is provided on the peripheral surface of the recess 114. Further, a tapered surface 118 whose diameter increases as it approaches the swash plate 105 side is provided at the end of the peripheral surface of the recess 114 on the swash plate 105 side.

  The swash plate type variable displacement hydraulic pump includes a retaining ring 112 having elasticity while engaging with each of the first and second annular grooves 116 and 117.

  The retaining ring 112 is made of a metal wire, and is bent in an annular shape so as to surround the swash plate support 106. The retaining ring 112 is bent at the one end 112a side and the other end 112b side, and the one end 112a and the other end 112b are in contact with the plug 119 substantially parallel to the radial direction. The retaining ring 112 has a substantially circular cross-sectional shape, and the radial width is shorter than the depth of the first annular groove 116. In other words, the depth of the first annular groove 116 is deeper than the radial width of the retaining ring 112. On the other hand, the depth of the second annular groove 117 is shallower than the radial width of the retaining ring 112. The retaining ring 112 is an example of a wire. The plug 119 is an example of a contacted member.

  The plug 119 extends in the radial direction between the peripheral surface of the swash plate support 106 and the peripheral surface of the recess 114. More specifically, the swash plate support 106 is provided with a notch 120 in which a part of the peripheral edge is notched and the tip of the plug 119 is inserted. Also, a through hole 121 that penetrates from the outer surface to the inner surface of the housing 101 is provided so as to face the notch 120 in the radial direction. As a result, the plug 119 can be inserted into the notch 120 by inserting the plug 119 into the through-hole 121.

  According to the swash plate type variable displacement hydraulic pump configured as described above, when the swash plate support 106 is fitted into the recess 114, first, as shown in FIG. 4, the first annular groove on the peripheral surface of the swash plate support 106 is provided. After the portion inside the retaining ring 112 in the radial direction is fitted to 116, the swash plate support 106 is fitted to the recess 114. At this time, as shown in FIG. 5, the retaining ring 112 slides on the tapered surface 118 of the recess 114. As a result, as shown in FIG. 6, the radially inner and radially outer portions of the retaining ring 112 are accommodated in the first annular groove 116. Then, when the swash plate support 106 is moved from the state of FIG. 6 to the bottom 101a side of the housing 101, the first and second annular grooves 116 and 117 face each other in the radial direction as shown in FIG. Thus, the retaining ring 112 is engaged with each of the first and second annular grooves 116 and 117.

  As described above, the retaining ring 112 is engaged with each of the first and second annular grooves 116 and 117, so that the axial movement of the swash plate support 106 can be restricted without using, for example, a mounting bolt. . Therefore, since it is not necessary to provide the screw hole into which the mounting bolt is screwed in the bottom surface of the recess 114, the processing of the housing 101 is reduced and the manufacturing can be performed at low cost.

  Further, since the mounting bolts need not be used, the mounting bolts need not be tightened with a long tool from the opening opposite to the bottom 101a side of the housing 101. Therefore, the swash plate type variable displacement hydraulic pump can be easily assembled.

  Further, since the axial movement of the swash plate support 106 is restricted without using the mounting bolt, the axial length of the assembly composed of the swash plate 105 and the swash plate support 106 can be shortened.

  If the mounting bolt can be inserted into the swash plate support 106 and the axial movement of the swash plate support 106 is restricted by the mounting bolt, the head of the mounting bolt comes into contact with the swash plate 105. In order to prevent this, it is necessary to increase the distance between the head of the mounting bolt and the swash plate 105. As a result, the axial length of the assembly composed of the swash plate 105 and the swash plate support 106 becomes long.

  Further, since the one end 112a and the other end 112b of the retaining ring 112 abut against the plug 119, the relative movement of the retaining ring 112 in the circumferential direction with respect to the housing 101 and the swash plate support 106 can be restricted.

  Further, since the distal end portion of the plug 119 is inserted into the notch 120 of the swash plate support 106, the relative rotation of the swash plate support 106 with respect to the housing 101 can be restricted.

  Further, since the depth of the first annular groove 116 is deeper than the radial width of the retaining ring 112, the radially inner and radially outer portions of the retaining ring 112 are accommodated in the first annular groove 116. can do. That is, the retaining ring 112 can be brought into the state shown in FIG. Accordingly, the swash plate support 106 can be smoothly fitted into the recess 114.

  In the first embodiment, the retaining ring 112 has a substantially circular cross section, but may have a substantially rectangular shape, a substantially square shape, a substantially oval shape, or the like.

  In the first embodiment, the depth of the first annular groove 116 is deeper than the radial width of the retaining ring 112, but may be the same as the radial width of the retaining ring 112.

  In the first embodiment, the metal retaining ring 112 is used. However, for example, a rubber retaining ring may be used.

  In the above-described embodiment, a convex portion protruding radially inward may be provided on the peripheral surface of the concave portion 114, and the one end 112a and the other end 112b of the retaining ring 112 may be brought into contact with the convex portion.

[Second Embodiment]
FIG. 7 is a schematic view of a cross section of a swash plate type variable displacement hydraulic pump according to a second embodiment of the present invention, taken along a plane parallel to the axial direction. In FIG. 7, the same components as those of the first embodiment are denoted by the same reference numerals as those of the components of the first embodiment.

  The swash plate type variable displacement hydraulic pump is provided with a bottomed cylindrical housing 201, a swash plate support 206 for tiltably supporting the swash plate 105, and a stop tube 222 (shown in FIG. 8). Different from the first embodiment. The swash plate support 206 is an example of a reaction force receiving member.

  The housing 201 has a bottom part 201a and a peripheral side part 201b which is provided integrally with the bottom part 201a and is continuous with the peripheral part of the bottom part 201a. A concave portion 214 into which the swash plate support 106 is fitted is provided on the inner surface of the bottom portion 201a. That is, the housing 201 has a recess 214 on the inner surface of the bottom 201a in which the swash plate support 206 is fitted.

  FIG. 8 is a schematic cross-sectional view taken along line VIII-VIII in FIG. FIG. 9 is an enlarged view of a portion surrounded by a circle C2 in FIG.

  As shown in FIGS. 8 and 9, a first annular groove 216 is provided on the peripheral surface of the swash plate support 206. On the other hand, a second annular groove 217 facing the first annular groove 216 is provided on the peripheral surface of the recess 214. Further, a tapered surface 223 whose diameter decreases as it approaches the bolt 108 is provided at the end of the peripheral surface of the swash plate support 206 on the bolt 108 side. In addition, an insertion hole 261 through which the rotation shaft 102 is inserted is provided at the center of the swash plate support 206.

  A retaining ring 112 is engaged with each of the first and second annular grooves 216 and 217. The depth of the first annular groove 216 is shallower than the radial width of the retaining ring 112. On the other hand, the depth of the second annular groove 217 is greater than the radial width of the retaining ring 112.

  The retaining tube 222 surrounds one end 112 a and the other end 112 b of the retaining ring 112. In other words, the one end 112 a and the other end 112 b of the retaining ring 112 are located between the plug 119 and the retaining tube 222.

  According to the swash plate type variable displacement hydraulic pump configured as described above, when the swash plate support 206 is fitted into the recess 214, first, as shown in FIG. 10, the retaining ring 112 is inserted into the second annular groove 217 of the recess 214. After fitting the radially outer portion, the swash plate support 206 is fitted into the recess 214. At this time, as shown in FIG. 11, the retaining ring 112 slides on the tapered surface 223 of the swash plate support 206. Thereby, as shown in FIG. 12, the radially inner and radially outer portions of the retaining ring 112 are accommodated in the second annular groove 217. Then, when the swash plate support 206 is moved to the bottom 201a side of the housing 201 from the state of FIG. 12, the first and second annular grooves 216 and 217 face each other in the radial direction as shown in FIG. Thus, the retaining ring 112 is engaged with each of the first and second annular grooves 216 and 217.

  As described above, the retaining ring 112 is engaged with each of the first and second annular grooves 216 and 217, so that the axial movement of the swash plate support 206 can be restricted without using, for example, a mounting bolt. . Therefore, since it is not necessary to provide the screw hole into which the mounting bolt is screwed on the bottom surface of the recess 214, the processing of the housing 201 is reduced, and the manufacturing can be performed at low cost.

  Further, since the mounting bolts need not be used, the mounting bolts need not be tightened with a long tool from the opening opposite to the bottom 201a side of the housing 201. Therefore, the swash plate type variable displacement hydraulic pump can be easily assembled.

  Further, since the axial movement of the swash plate support 206 is restricted without using the mounting bolt, the axial length of the assembly comprising the swash plate 105 and the swash plate support 206 can be shortened.

  If the mounting bolt can be inserted into the swash plate support 206 and the axial movement of the swash plate support 206 is restricted by the mounting bolt, the head of the mounting bolt contacts the swash plate 105. In order to prevent this, it is necessary to increase the distance between the head of the mounting bolt and the swash plate 105. As a result, the axial length of the assembly composed of the swash plate 105 and the swash plate support 206 becomes long.

  Further, since the one end 112a and the other end 112b of the retaining ring 112 abut against the plug 119, relative movement of the retaining ring 112 in the circumferential direction with respect to the housing 201 and the swash plate support 206 can be restricted.

  Further, since the distal end portion of the plug 119 is inserted into the cutout portion 120 of the swash plate support 206, the relative rotation of the swash plate support 206 with respect to the housing 201 can be restricted.

  In addition, since the depth of the second annular groove 217 is deeper than the radial width of the retaining ring 112, the radially inner and radially outer portions of the retaining ring 112 are accommodated in the second annular groove 217. can do. That is, the retaining ring 112 can be brought into the state shown in FIG. Therefore, the swash plate support 206 can be smoothly fitted into the recess 214.

  Further, since the retaining tube 222 surrounds the one end 112 a and the other end 112 b of the retaining ring 112, it is possible to prevent the one end 112 a and the other end 112 b of the retaining ring 112 from being separated from the plug 119. Therefore, the effect of restricting the movement of the retaining ring 112 in the circumferential direction can be enhanced.

  In the second embodiment, the depth of the second annular groove 217 is deeper than the radial width of the retaining ring 112, but may be the same as the radial width of the retaining ring 112.

[Third Embodiment]
FIG. 13 is a schematic cross-sectional view of a swash plate type variable displacement hydraulic pump according to a third embodiment of the present invention cut along a plane perpendicular to the axial direction. In FIG. 13, the same components as those of the first embodiment are denoted by the same reference numerals as those of the components of the first embodiment. Also in the following description, the same components as those of the first embodiment are denoted by the same reference numerals as those of the components of the first embodiment.

  The swash plate type variable displacement hydraulic pump includes a bottomed cylindrical housing 301, a swash plate support 306 that supports the swash plate 105 so as to be tiltable, and a retaining ring 312. Different. The swash plate support 306 is an example of a reaction force receiving member.

  The housing 301 has a bottom portion 301a and a peripheral side portion that is provided integrally with the bottom portion 301a and that is continuous with the peripheral edge portion of the bottom portion 301a. A concave portion 314 into which the swash plate support 306 is fitted is provided on the inner surface of the bottom portion 301a. That is, the housing 301 has a recess 314 in which the swash plate support 306 is fitted on the inner surface of the bottom 301a. The housing 301 is also provided adjacent to the through hole 121 and has a through hole 324 that penetrates from the outer surface to the inner surface of the housing 301.

  The through hole 324 communicates with the first and second annular grooves 316 and 317. A plug 325 is inserted into the through hole 324. The plug 325 is an example of a second contacted member.

  A first annular groove 316 is provided on the peripheral surface of the swash plate support 306. On the other hand, a second annular groove 317 facing the first annular groove 316 is provided on the peripheral surface of the recess 314. Further, an insertion hole 361 through which the rotation shaft 102 is inserted is provided at the center of the swash plate support 306.

  The swash plate type variable displacement hydraulic pump is provided with a retaining ring 312 having elasticity while engaging with each of the first and second annular grooves 316 and 317.

  The retaining ring 312 is made of a metal wire, and is bent in an annular shape so as to surround the swash plate support 106. In addition, the retaining ring 312 has one end 312 a in contact with the plug 119 and the other end 312 b in contact with the plug 325. The retaining ring 312 has a substantially circular cross-sectional shape. The radial width of the retaining ring 312 is substantially equal to the sum of the depth of the first annular groove 316 and the depth of the second annular groove 317. More specifically, the depths of the first and second annular grooves 316 and 317 are substantially equal to half the radial width of the retaining ring 312. The plug 119 is an example of a first contacted member. The retaining ring 312 is an example of a wire.

  According to the swash plate type variable displacement hydraulic pump configured as described above, the retaining ring 312 is engaged with each of the first and second annular grooves 316 and 317, so that, for example, without using a mounting bolt, the swash plate support 306 is provided. Can be controlled in the axial direction. Therefore, since it is not necessary to provide a screw hole into which the mounting bolt is screwed on the bottom surface of the recess 314, the processing of the housing 301 is reduced, and the manufacturing can be performed at low cost.

  Further, since the mounting bolts need not be used, the mounting bolts need not be tightened with a long tool from the opening opposite to the bottom 301a side of the housing 301. Therefore, the swash plate type variable displacement hydraulic pump can be easily assembled.

  Further, since the axial movement of the swash plate support 306 is restricted without using the mounting bolt, the axial length of the assembly comprising the swash plate 105 and the swash plate support 306 can be shortened.

  If the mounting bolt can be inserted into the swash plate support 306 and the axial movement of the swash plate support 306 is restricted by the mounting bolt, the head of the mounting bolt comes into contact with the swash plate 105. In order to prevent this, it is necessary to increase the distance between the head of the mounting bolt and the swash plate 105. As a result, the axial length of the assembly composed of the swash plate 105 and the swash plate support 306 becomes long.

  The retaining ring 312 has one end 312a abutting against the plug 119 and the other end 312b abutting against the plug 325. Can be regulated.

  Further, since the distal end portion of the plug 119 is inserted into the cutout portion 120 of the swash plate support 306, relative rotation of the swash plate support 306 with respect to the housing 301 can be restricted.

  Further, since the through hole 324 communicates with the first and second annular grooves 316 and 317, the swash plate support 306 is fitted into the recess 314 and the second annular groove 317 is fitted into the first annular groove 316. , The wire rod made of the material of the retaining ring 312 is inserted into the first and second annular grooves 316 and 317 from the through hole 324, and the retaining ring is inserted into each of the first and second annular grooves 316 and 317. 312 can be engaged.

  Further, since the sum of the depth of the first annular groove 316 and the depth of the second annular groove 317 is substantially equal to the radial width of the retaining ring 312, rattling of the swash plate support 306 can be reduced. .

  In the third embodiment, the retaining ring 312 is formed of a metal wire having elasticity, but may be formed of a metallic wire having plasticity, for example.

  Instead of the swash plate 105 and the swash plate support bases 106, 206, and 306 of the first to third embodiments, a member in which the swash plate and the swash plate support base are integrally provided may be used.

  That is, the fixed displacement hydraulic pump according to the embodiment of the present invention may include a swash plate combined member 426 as an example of a reaction force receiving member as shown in FIG. In FIG. 14, the same components as those of the first embodiment are denoted by the same reference numerals as those of the components of the first embodiment.

  The swash plate combined member 426 has a sliding surface 426a on which the shoe 111 slides. The sliding surface 426a is inclined with respect to the axial direction. An annular groove similar to the first annular groove 116 of the first embodiment is provided at the end of the peripheral surface of the swash plate combined member 426 on the bottom 101a side. Further, an insertion hole 427 through which the rotating shaft 102 is inserted is provided at the center of the swash plate combined member 426.

  Although specific embodiments of the present invention have been described, the present invention is not limited to the first to third embodiments, and can be implemented with various modifications within the scope of the present invention. For example, a combination of the first to third embodiments and the modifications thereof may be used as an embodiment of the present invention. The present invention may also be applied to variable displacement hydraulic pumps, fixed displacement hydraulic pumps, variable displacement hydraulic motors, fixed displacement hydraulic motors, and the like that use liquids other than oil.

101, 201, 301 Housing 102 Rotating shaft 104 Piston 105 Swash plate 106, 206, 306 Swash plate support 112, 312 Retaining ring 114, 214, 314 Recess 116, 216, 316 First annular groove 117, 217, 317 First Two annular grooves 119 Plug 222 Stop tube 426 Swash plate combined member

Claims (2)

A bottomed cylindrical housing (101, 201, 301);
A rotating shaft (102) rotatably provided in the housing (101, 201, 301);
A plurality of pistons (104) provided in the housing (101, 201, 301) so as to be rotatable around the rotation axis (102) and reciprocating with rotation around the rotation axis (102);
A reaction force receiving member (106, 206, 306, 426) received in the housing (101, 201, 301) and receiving a reaction force for reciprocating the piston (104);
The housing (101, 201, 301) has recesses (114, 214, 314) in which the reaction force receiving members (106, 206, 306, 426) are fitted on the inner surface of the bottom (101a, 201a, 301a). And
On the circumferential surface of the reaction force receiving member (106, 206, 306, 426), a first annular groove (116, 216, 316) is provided,
A second annular groove (117, 217, 317) facing the first annular groove (116, 216, 316) is provided on the peripheral surface of the recess (114, 214, 314),
The first, the wire to each of the second annular groove (116,216,316,117,217,317) (112, 312) is engaged,
A through hole (324) penetrating from the outer surface to the inner surface of the housing (301),
The through hole (324) communicates with the first and second annular grooves (316, 317),
A first abutting member (119) extending in a radial direction between a peripheral surface of the reaction force receiving member (306) and a peripheral surface of the concave portion (114, 214, 314);
A second abutting member (325) inserted into the through hole (324);
With
One end (312a) of the wire (312) abuts on the first abutted member (119), while the other end (312b) of the wire (312) is abutted on the second abutted member (325). A hydraulic device characterized by contacting the The hydraulic device according to claim 1 ,
The hydraulic device characterized in that the sum of the depth of the first annular groove (316) and the depth of the second annular groove (317) is substantially equal to the radial width of the wire (312).

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