JP2012255391A - Variable displacement swash plate type hydraulic rotary machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a variable displacement swash plate type hydraulic rotary machine in which a bearing member such as a bearing metal can be bonded stably to the tilting support surface of a swash plate support part to secure sufficient bonding strength.SOLUTION: A bearing metal 14 made of a band-like body extending in a recessed curve shape along the tilting support surface 11A of a swash plate support body 11 having the leg of the swash plate in sliding contact therewith in a tiltable manner is bonded to the tilting support surface 11A in a plastic flow state. In this case, the bearing metal 14 is bonded to the tilting support surface 11A in the plastic flow state by pressing vertically the tip 16A of a tool 16 for friction stir bonding toward the tilting support surface 11A while turning the same. The surrounding of each bonding portion 14A is formed with an unbonded covered portion 14B covering the tilting support surface 11A from outside in a surface contact state.

Description

  The present invention relates to a variable displacement swash plate type hydraulic rotating machine that is provided in a construction machine such as a hydraulic excavator, a hydraulic crane, a wheel loader, and the like and is suitably used as a hydraulic pump or a hydraulic motor.

  In general, a variable displacement swash plate type hydraulic rotating machine is used as a hydraulic pump that constitutes a hydraulic power source in a construction machine such as a hydraulic excavator. When used as a hydraulic actuator, it constitutes a hydraulic motor for turning or traveling.

  A variable capacity swash plate type hydraulic rotating machine according to this type of prior art includes a cylindrical casing, a rotary shaft rotatably provided on the casing, and the casing so as to rotate integrally with the rotary shaft. A cylinder block having a plurality of cylinders extending in the axial direction and spaced apart in the circumferential direction, a plurality of pistons fitted in the cylinders of the cylinder block so as to be reciprocally movable, and protruding from the cylinders A plurality of shoes mounted on the projecting end side of each piston, and a front surface side is a smooth surface that guides each shoe so as to be slidable, and a rear surface side is tiltably supported by a swash plate support portion on the casing side. And a tilt actuator provided on the casing for tilting the swash plate by supplying and discharging tilt control pressure from the outside.

  Further, on the back side of the swash plate, a pair of legs that are spaced apart from each other across the rotation shaft and project in a convex curve toward the swash plate support are provided. A pair of tilting support surfaces are provided corresponding to the pair of leg portions, and are formed in a concave curved shape and support the swash plate so as to be tiltable via the leg portions. Further, there is known a structure in which a bearing metal as a slide bush is provided on these tilting support surfaces to facilitate the tilting operation of the swash plate (see, for example, Patent Document 1).

  In this case, the bearing metal is formed by using a strip-shaped plate material extending in a concave curve along the tilt support surface with which the leg portion of the swash plate is slidably contacted, and both ends of the plate material in the longitudinal direction are formed. On the side, a bent portion formed by bending in a substantially V shape or L shape is provided. These bent portions are fixed to the swash plate support portion at both ends in the lengthwise direction of the tilt support surface, so that the bearing metal covers the tilt support surface from the outside. In this state, it is positioned and fixed to the swash plate support.

Japanese Utility Model Laid-Open No. 5-1866 (utility model registration No. 2584135)

  By the way, the variable capacity swash plate type hydraulic rotating machine according to the prior art is applied to the tilt sliding surface between the bearing metal provided on each tilt support surface of the swash plate support portion and each leg portion of the swash plate. An oil guide passage for guiding the pressure oil from the supply / discharge passage on the high pressure side of the pair of supply / discharge passages of the hydraulic rotating machine, and the inclined sliding surface is lubricated by the pressure oil from the oil guide passage There is something that is configured to keep. However, the bearing metal only fixes the bent portions at both ends in the length direction to the swash plate support portions in a secured state at both ends in the length direction of the tilt support surface.

  For this reason, a small gap may be formed between the tilt support surface of the swash plate support portion and the bearing metal, and a part of the pressure oil supplied from the oil guide passage to the tilt slide surface There is a risk of leakage to the outside from the gap between the tilt support surface and the bearing metal. And if a part of the pressure oil leaks outside through the gap, a sufficient amount of pressure oil cannot be supplied to the tilting sliding surface between the leg portion of the swash plate and the bearing metal, There is a problem that it is difficult to keep the tilting sliding surface in a lubricated state.

  The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to stably join a bearing member such as a bearing metal to a tilt support surface of a swash plate support portion. It is an object of the present invention to provide a variable capacity swash plate type hydraulic rotating machine capable of smoothly and stably stabilizing a tilting operation of a swash plate with respect to a member.

  Another object of the present invention is to stably supply pressure oil to an inclined sliding surface between a leg portion of a swash plate and a bearing member from an oil guide passage provided in the casing. An object of the present invention is to provide a variable capacity swash plate type hydraulic rotating machine capable of maintaining a rolling sliding surface in a lubricated state over a long period of time.

  In order to solve the above-described problems, the present invention is provided with a cylindrical casing provided with a swash plate support portion on one side and a pair of supply / exhaust passages on the other side, and rotatably provided in the casing. A rotary shaft, a cylinder block provided in the casing so as to rotate integrally with the rotary shaft and having a plurality of cylinders extending in the axial direction and spaced apart in the circumferential direction, and reciprocating to each cylinder of the cylinder block A plurality of pistons inserted into the cylinders, a plurality of shoes mounted on the projecting end sides of the pistons projecting from the cylinders, and a front surface side which is a smooth surface which slidably guides the shoes, and a back surface side A swash plate that is supported by the swash plate in a tiltable manner; and a tilt actuator that is provided on the casing and tilts and drives the swash plate by being supplied and discharged from the outside. Back of swash plate Is provided with a pair of legs that are spaced apart from each other across the rotation shaft and project in a convex curve toward the swash plate support, and the swash plate support corresponds to the pair of legs. The present invention is applied to a variable capacity swash plate type hydraulic rotating machine that is formed in a concave curve and is provided with a pair of tilt support surfaces that tiltably support the swash plate via the legs.

  A feature of the configuration adopted by the invention of claim 1 is that at least one of the tilt support surfaces of the swash plate support portion is slidable on the tilt support surface so that the leg portion of the swash plate can tilt. A bearing member made of a band-like body extending in a concave curved shape is provided along the contacting surface, and the bearing member presses the tilting support surface of the swash plate support portion while rotating the friction stir welding tool. Thus, the configuration is such that the tilt support surface is joined in a plastic flow state.

  According to the invention of claim 2, between the tilt support surface of the swash plate support portion and the bearing member, a belt-like band extending between the tilt support surface and the tilt support surface. The insert member is provided, and the bearing member is joined to the tilt support surface in a plastic flow state together with the insert member using the friction stir welding tool.

  On the other hand, according to the invention of claim 3, the bearing member includes one or a plurality of joints joined to the tilt support surface by the friction stir welding tool, and is positioned around the joints. And it is set as the structure which provides the non-joining coating | coated part which covers the said inclination support surface from the outer side, without being joined with respect to the said inclination support surface.

  According to a fourth aspect of the present invention, the joint for friction stir welding the bearing member to the tilt support surface is a direction parallel to the tilt direction of the swash plate with respect to the swash plate support, the tilt direction It is set as the structure extended in the direction perpendicular | vertical to the direction or slanting with respect to the said inclination direction.

  According to a fifth aspect of the present invention, the joint portion of the bearing member is formed so as to be recessed in a concave shape with respect to the non-joining covering portion located in the periphery thereof.

  Further, according to the invention of claim 6, the casing is provided with an oil guiding passage extending between the swash plate and the swash plate support portion for keeping the inclined sliding surfaces of both in a lubricated state, The bearing member is provided with a communication hole that communicates with the oil guide passage and opens at a tilting sliding surface with the swash plate, and the joining portion is formed so as to surround the opening of the communication hole. It is said.

  As described above, according to the first aspect of the present invention, there is provided a bearing member comprising a belt-like body extending in a concave curve along the tilt support surface of the swash plate support portion in which the leg portion of the swash plate is slidably contacted. By pressing the friction stir welding tool toward the tilting support surface of the swash plate support portion while rotating, the bearing member is stabilized on the tilting support surface in the plastic flow state, that is, in the friction stirrer state. They can be joined, and the joining strength of the bearing member can be increased by a simple method. And the leg part of a swash plate can be smoothly slidably contacted with the inclination support surface of a swash plate support part via a bearing member, and the inclination operation | movement of a swash plate can be stabilized.

  The invention of claim 2 can be provided by inserting a belt-like insert member between the tilt support surface of the swash plate support portion and the bearing member, and at this time, using a tool for friction stir welding The bearing member and the insert member can be joined to the tilt support surface together in a plastic flow state. By using the insert member, it is possible to further increase the bonding strength of the swash plate support portion with respect to the inclined sliding surface while maintaining the properties as a bearing member.

  On the other hand, according to the invention of claim 3, one or a plurality of joints can be formed on the bearing member by pressing the friction stir welding tool against the bearing member while rotating the tool. Can be joined to the tilting support surface. And the non-joining coating | coated part which covers the said inclination support surface from the outer side, without being joined with respect to the said inclination support surface can be provided in the circumference | surroundings of the said junction part among bearing members.

  According to the invention of claim 4, the joint portion of the bearing member is formed to extend in a direction parallel to the tilt direction of the swash plate with respect to the swash plate support portion, or in a direction perpendicular to the tilt direction. It can be formed by extending, or can be formed by extending in a direction inclined obliquely with respect to the tilt direction. Accordingly, it is possible to select the direction in which the joint portion is extended in consideration of the peeling force acting on the bearing member with the tilting operation of the swash plate, that is, the force that peels the bearing member from the tilting support surface. Further, the peeling of the bearing member from the tilt support surface can be effectively suppressed by the shape of the joint portion, and the durability, life, and reliability of the bearing member can be improved.

  In the invention of claim 5, a part of the lubricating oil is held in the concave joint part by forming the joint part of the bearing member in a concave shape rather than the non-joining covering part located around the bearing member. Thus, the oil film can be formed, and the inclined sliding surface between the leg portion of the swash plate and the bearing member can be kept in a lubricated state by the oil film.

  Furthermore, in the invention of claim 6, the communication hole is communicated with the oil guide passage on the back surface side of the bearing member, and the communication hole is opened on the surface side of the bearing member (the inclined sliding surface side with the swash plate). The joint portion of the bearing member can be formed in a shape surrounding the opening portion of the communication hole from the periphery thereof. For this reason, even if a minute gap is formed between the non-bonding covering portion of the bearing member and the tilting support surface of the swash plate support portion, the guide hole surrounds the communication hole with the joint portion. The pressure oil from the oil passage can be prevented from leaking into the gap, and a sufficient amount of pressure oil can be supplied to the inclined sliding surface between the leg portion of the swash plate and the bearing member. it can.

1 is a longitudinal sectional view showing a variable displacement swash plate hydraulic pump according to a first embodiment of the present invention. It is a longitudinal cross-sectional view which shows the swash plate in FIG. 1 as a single unit. It is the right view which looked at the swash plate from the right direction in FIG. It is a left view which shows the swash plate support body in FIG. 1 as a single unit. It is sectional drawing which looked at the swash plate support body from the arrow VV direction in FIG. It is the perspective view which looked at the swash plate support body of FIG. 4 from diagonally upward. It is a left view in the same position as FIG. 4 which shows the swash plate support body by 2nd Embodiment. It is sectional drawing which looked at the swash plate support body from the arrow VIII-VIII direction in FIG. It is sectional drawing which looked at the swash plate support body from the arrow IX-IX direction in FIG. It is sectional drawing which looked at the swash plate support body from the arrow XX direction in FIG. It is a left view in the same position as FIG. 4 which shows the swash plate support body by 3rd Embodiment. It is sectional drawing which looked at the swash plate support body from the arrow XII-XII direction in FIG. It is the fragmentary sectional view which expanded the swash plate support body from the arrow XIII-XIII direction in FIG. It is the perspective view which looked at the swash plate support body of FIG. 11 from diagonally upward. It is a left view in the same position as FIG. 4 which shows the swash plate support body by 4th Embodiment. It is sectional drawing which looked at the swash plate support body from the arrow XVI-XVI direction in FIG. It is a left view in the same position as FIG. 4 which shows the swash plate support body by 5th Embodiment. It is sectional drawing which looked at the swash plate support body from the arrow XVIII-XVIII direction in FIG. It is a left view in the same position as FIG. 4 which shows the swash plate support body by 6th Embodiment. It is a left view in the same position as FIG. 4 which shows the swash plate support body by 7th Embodiment. It is a left view in the same position as FIG. 4 which shows the swash plate support body by 8th Embodiment. It is a left view in the same position as FIG. 4 which shows the swash plate support body by 9th Embodiment. It is sectional drawing which looked at the swash plate support body from the arrow XXIII-XXIII direction in FIG. It is sectional drawing which looked at the swash plate support body from the arrow XXIV-XXIV direction in FIG.

  Hereinafter, a variable displacement swash plate type hydraulic rotating machine according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings, taking as an example a case of using it as a hydraulic pump, for example.

  Here, FIG. 1 to FIG. 6 show a first embodiment of the present invention. In the figure, reference numeral 1 denotes a swash plate type hydraulic pump as a variable capacity swash plate type hydraulic rotating machine. This hydraulic pump 1 includes a casing 2, a rotating shaft 4, a cylinder block 5, a plurality of cylinders 6, a piston 7 and a shoe which will be described later. 8, the valve plate 10, the swash plate support 11, the swash plate 12, and the like.

  2 is a cylindrical casing that is an outer shell of the hydraulic pump 1, and as shown in FIG. The rear casing 2C is used. The casing body 2A may be formed integrally with either the front casing 2B or the rear casing 2C.

  A swash plate support 11, which will be described later, is provided on the front casing 2B located on one side of the casing body 2A so as to face the back side of the swash plate 12. A pair of supply / discharge passages 3A and 3B indicated by dotted lines in FIG. 1 are provided in the rear casing 2C located on the other side of the casing body 2A. One of the supply / discharge passages 3A and 3B is connected to a tank (not shown) as a suction passage on the low pressure side, and the other supply / discharge passage 3B serves as a discharge passage on the high pressure side. Connected to a discharge pipe (not shown).

  Reference numeral 4 denotes a rotating shaft rotatably provided in the casing 2, and the rotating shaft 4 is rotatably supported by the front casing 2B and the rear casing 2C via bearings. One end side of the rotating shaft 4 is a protruding end 4A protruding in the axial direction from the front casing 2B, and a prime mover such as an engine is connected to the protruding end 4A via a power transmission mechanism (none of which is shown). Is.

  Reference numeral 5 denotes a cylinder block provided in the casing 2 so as to rotate integrally with the rotary shaft 4. The cylinder block 5 includes a plurality of cylinders 6, 6,. Is provided. The number of cylinders 6 provided in the cylinder block 5 is usually an odd number, for example, 7 or 9.

  7, 7,... Are a plurality of pistons slidably fitted in the cylinders 6 of the cylinder block 5. The pistons 7 reciprocate in the cylinders 6 as the cylinder block 5 rotates. The suction stroke and the discharge stroke are repeated.

  8, 8,... Are a plurality of shoes respectively provided on each piston 7. Each shoe 8 is one end side (protruding end side) of the piston 7 protruding from the cylinder 6 of the cylinder block 5 in the axial direction of the rotary shaft 4. ) Are swingably mounted.

  9 is an annular shoe presser that holds each shoe 8 against the swash plate 12. The shoe presser 9 presses the shoe 8 toward the smooth surface 12C of the swash plate 12 described later, as shown in FIG. This compensates the sliding displacement of each shoe 8 on the smooth surface 12C of the swash plate 12 so as to draw an annular locus.

  A valve plate 10 is provided in the casing 2 so as to be fixed between the rear casing 2C and the cylinder block 5. The valve plate 10 rotatably supports the cylinder block 5 that rotates integrally with the rotary shaft 4 together with the rear casing 2C, and in this state, is in sliding contact with the end face of the cylinder block 5. The valve plate 10 is formed with a pair of supply / discharge ports 10A, 10B having an eyebrow shape, and these supply / discharge ports 10A, 10B communicate with the supply / discharge passages 3A, 3B of the rear casing 2C.

  The supply / discharge ports 10 </ b> A and 10 </ b> B of the valve plate 10 communicate with each cylinder 6 intermittently when the cylinder block 5 rotates. At this time, the pistons 7 reciprocating in the respective cylinders 6 sucked the hydraulic oil into the respective cylinders 6 from the one supply / discharge passage 3A side in the intake stroke, and became in a high pressure state in the respective cylinders 6 in the discharge stroke. Pressure oil is discharged from the other supply / discharge passage 3B.

  Reference numeral 11 denotes a swash plate support as a swash plate support provided on the front casing 2B around the rotating shaft 4, and the swash plate support 11 includes the swash plate support 11 as shown in FIGS. A pair of tilt support surfaces 11A and 11B are integrally formed on the left and right sides, for example, with the rotary shaft 4 interposed therebetween. The tilt support surfaces 11A and 11B of the swash plate support 11 support the swash plate 12 through tilting bearing metals 14 and 15 described later so as to be tiltable.

  Tilt support surfaces 11A and 11B of the swash plate support 11 are formed in a concave curved shape corresponding to legs 12A and 12B of the swash plate 12 described later, and the swash plate 12 is indicated by arrows A and B in FIG. It is guided so as to be tiltable (slidable) in the direction. The swash plate support 11 is provided with a shaft insertion hole 11C (see FIG. 4) located between the left and right tilt support surfaces 11A and 11B. As shown in FIG. 1, the rotating shaft 4 is inserted with a gap.

  A swash plate 12 is provided in the casing 2 so as to be tiltable via a swash plate support 11. On the back side of the swash plate 12, as shown in FIGS. 1 to 3, a pair of left and right legs 12A projecting in a convex curve toward the tilting support surfaces 11A and 11B of the swash plate support 11, 12B is provided. The leg portions 12A and 12B of the swash plate 12 are slidably fitted to the tilting support surfaces 11A and 11B of the swash plate support 11 which is spaced apart, for example, left and right across the rotation shaft 4 and has a concave curved shape. It is to be combined.

  On the other hand, the surface side of the swash plate 12 is a smooth surface 12C that guides each shoe 8 slidably as shown in FIG. Further, the swash plate 12 is provided with a through hole 12D that extends through in the plate thickness direction. The through hole 12D is located between the leg portions 12A and 12B, and the rotary shaft 4 is inserted with a gap. The swash plate 12 is tilted in the directions indicated by arrows A and B shown in FIG. The discharge capacity (pressure oil discharge flow rate) of the hydraulic pump 1 is variably controlled according to the tilt angle of the swash plate 12.

  Reference numerals 13 and 13 denote arc-shaped concave grooves provided in the leg portions 12A and 12B of the swash plate 12, and each arc-shaped concave groove 13 is formed as a shallow groove extending in an arc shape along the surface of the leg portions 12A and 12B. ing. The circular arc-shaped groove 13 functions as a hydrostatic bearing when, for example, pressure oil is guided from oil guide passages 19 and 20 described later. That is, the pressure oil supplied into the arc-shaped concave groove 13 generates a separation force (hydraulic pressure) between the tilt support surfaces 11A and 11B (bearing metals 14 and 15 described later) and the leg portions 12A and 12B. In addition, the contact surfaces of both are kept in a lubricated state.

  Reference numerals 14 and 15 denote bearing metals as bearing members provided on the tilt support surfaces 11A and 11B of the swash plate support 11, and the bearing metals 14 and 15 are, for example, high / medium carbon steel, case-hardened steel, Formed as a thin strip-shaped body made of a metal plate material such as steel, corrosion-resistant steel, cast iron, copper alloy, aluminum or titanium alloy, and the surfaces of the legs 12A and 12B of the swash plate 12 that are slidably contactable (tilt It extends in a concave curve along the supporting surfaces 11A, 11B). The bearing metals 14 and 15 are joined to the tilt support surfaces 11A and 11B of the swash plate support 11 in a plastic flow state by the joint portions 14A and 15A, and the leg portions 12A and 12B of the swash plate 12 are tilted and supported. It functions as a slide bush for smoothly sliding (tilting) displacement along 11A and 11B.

  The bearing metals 14 and 15 employed in the first embodiment are one representative example of a bearing member. For example, a bearing member may be formed using a polymer resin material in addition to a metal material. Is. This also applies to second to ninth embodiments described later.

  Here, one bearing metal 14 of the bearing metals 14 and 15 shown in FIG. 4 is formed by using a plurality of (for example, a total of six) joints 14A formed by using friction stir welding means. It joins so that it may closely_contact | adhere to 11A of inclination support surfaces. That is, on one bearing metal 14, a total of six joints 14A are formed as circular joint traces by the friction stir welding tool 16 shown in FIGS. 5 and 6, and each of these joints 14A, The swash plate 12 is arranged in a line along the tilt support surface 11A extending in the tilt direction.

  In this case, the friction stir welding tool 16 shown in FIGS. 5 and 6 is rotated in the direction indicated by arrow C by a dedicated machine (not shown), and the bearing metal 14 is tilted to the swash plate support 11. Press toward the support surface 11A so as to strongly press in the direction indicated by the arrow D (that is, the direction perpendicular to the tilt support surface 11A). As a result, the contact portion of the bearing metal 14 with which the tip 16A of the tool 16 abuts becomes a high temperature due to heat input accompanying frictional stirring and becomes a plastic flow state. In this state, the contact portion 11A partially melts into the tilt support surface 11A. In this way, they are joined.

  For this reason, a circular joint 14 </ b> A corresponding to the tip shape of the tool 16 is formed at the contact portion of the bearing metal 14. Further, the friction stir welding operation as described above by the tip portion 16A of the tool 16 is repeated on the bearing metal 14 at intervals along the arc surface of the tilt support surface 11A, for example, a total of six joint portions. 14A is formed in a state of being arranged in a row at intervals. Further, the bearing metal 14 is formed with a non-bonding coating portion 14B located around each of the bonding portions 14A, and the non-bonding coating portion 14B is bonded to the tilt support surface 11A of the swash plate support 11. The tilt support surface 11A is covered in a surface contact state from the outside without any contact.

  On the other hand, the joint 15A of the bearing metal 15 is tilted by gradually moving the tip 16A of the tool 16 that performs the friction stir welding as described above along the tilt support surface 11B of the swash plate support 11. It is formed in a shape that is elongated and linearly extended along the rolling support surface 11B. The joint 15A extends in parallel to the tilting direction of the swash plate 12 (the directions indicated by arrows A and B shown in FIG. 1). Further, the bearing metal 15 is formed with a non-bonding coating portion 15B located around the bonding portion 15A, and the non-bonding coating portion 15B is bonded to the tilt support surface 11B of the swash plate support 11. The tilt support surface 11B is covered in a surface contact state from the outside without any problem.

  As described above, after a plurality of joints 14A are formed on one bearing metal 14 by the friction stir welding tool 16, and one elongated joint 14A is formed on the other bearing metal 15, for example, grinding is performed. Finishing using means, polishing means or the like is performed on the surface side of the bearing metals 14 and 15. As a result, the surfaces of the bearing metals 14 and 15 (surfaces on which the leg portions 12A and 12B of the swash plate 12 are slidably contacted so as to be tilted) are formed to have a uniform smooth surface including the joint portions 14A and 15A.

  Reference numerals 17 and 18 denote a pair of tilting actuators for tilting the swash plate 12. The tilting actuators 17 and 18 are formed on the casing main body 2A so as to be positioned radially outside the cylinder block 5 as shown in FIG. Cylinder bores 17A, 18A, and tilted pistons 17C, which are slidably inserted into the cylinder holes 17A, 18A and define hydraulic chambers 17B, 18B between the cylinder holes 17A, 18A. 18C and control pressure passages 17D and 18D formed in the casing body 2A for supplying and discharging the tilt control pressure into the hydraulic pressure chambers 17B and 18B.

  The tilting actuators 17 and 18 are disposed at positions facing each other in the radial direction of the cylinder block 5 with respect to the casing body 2A, and the tilting pistons 17C and 18C drive the swash plate 12 in the directions indicated by arrows A and B. To do. That is, the tilt control pressure is supplied and discharged from the outside to the hydraulic pressure chambers 17B and 18B of the tilt actuators 17 and 18 through the control pressure passages 17D and 18D shown in FIG.

  With this tilt control pressure, when the tilt piston 17C of the tilt actuator 17 extends from the cylinder hole 17A as shown in FIG. 1 and the tilt piston 18C of the tilt actuator 18 contracts into the cylinder hole 18A, the tilt piston 17C is tilted. The plate 12 is driven to tilt in the direction indicated by the arrow A (that is, the positive direction in which the tilt angle increases) by the tilt piston 17C. Further, when the tilting piston 18C extends from the cylinder hole 18A and the tilting piston 17C contracts into the cylinder hole 17A, the swash plate 12 is moved in the direction indicated by the arrow B (ie, the tilting angle is changed by the tilting piston 18C). It is tilted and driven in the reverse direction.

  Next, reference numeral 19 denotes a first oil guide passage provided in the casing 2. The first oil guide passage 19 has one side in the length direction on the rear casing 2C side as shown by a dotted line in FIG. The other side in the length direction (hereinafter referred to as the front end side of the oil guide passage 19) is connected to the high pressure side supply / discharge passage 3B and extends toward the swash plate support 11 in the front casing 2B. Further, a second oil guide passage 20 is formed in the swash plate support 11, for example, as shown by a two-dot chain line in FIG.

  The second oil guide passage 20 is formed such that the base end side thereof is connected to the tip end side of the first oil guide passage 19 and the tip end side opens to the surfaces of the bearing metals 14 and 15. As a result, the first and second oil guide passages 19 and 20 tilt the pressure oil supplied from the supply / discharge passage 3B between the bearing metals 14 and 15 and the leg portions 12A and 12B of the swash plate 12, for example. It leads to a sliding surface (for example, in the arcuate groove 13 shown in FIG. 3).

  When a material having self-lubricating properties (for example, a copper-based material) is used as the material for the bearing metals 14 and 15, lubricating oil is provided between the leg portions 12A and 12B of the swash plate 12 and the bearing metals 14 and 15. It is not always necessary to supply. In such a case, the first oil guide passage 19 provided in the casing 2 and the second oil guide passage 20 provided in the swash plate support 11 may be omitted.

  The variable displacement swash plate hydraulic pump 1 according to the present embodiment has the above-described configuration, and the operation thereof will be described next.

  First, when the discharge capacity of the hydraulic pump 1 is increased, the tilt control pressure is supplied from the outside to the hydraulic chamber 17B of the tilt actuator 17 through the control pressure passage 17D, and the control is performed from the hydraulic chamber 18B of the tilt actuator 18. The tilt control pressure is discharged to the outside through the pressure passage 18D. As a result, the tilting piston 17C of the tilting actuator 17 extends from within the cylinder hole 17A, and the tilting piston 18C of the tilting actuator 18 contracts into the cylinder hole 18A, so that the tilt angle of the swash plate 12 increases. Thus, it is tilted and driven in the direction of arrow A in FIG.

  Further, when the discharge capacity of the hydraulic pump 1 is reduced to a small value, the tilt control pressure is supplied from the outside to the hydraulic chamber 18B of the tilt actuator 18 through the control pressure passage 18D, and from the hydraulic chamber 17B of the tilt actuator 17 The tilt control pressure is discharged to the outside through the control pressure passage 17D. Accordingly, the tilt piston 18C of the tilt actuator 18 extends from the cylinder hole 18A, and the tilt piston 17C of the tilt actuator 17 contracts into the cylinder hole 17A. Therefore, the swash plate 12 has a small tilt angle. In this way, it is tilted and driven in the direction of arrow B in FIG.

  In this way, when the swash plate 12 is tilted and driven in the directions indicated by arrows A and B by the tilt actuators 17 and 18, the legs 12 A and 12 B of the swash plate 12 are tilted and supported by the tilt support surfaces 11 A and 11 B of the swash plate support 11. Tilt so as to slide and displace on the bearing metals 14 and 15 along 11B. However, with the tilting operation of the swash plate 12, a force is applied to the bearing metals 14 and 15 to peel the bearing metals 14 and 15 from the tilt support surfaces 11A and 11B of the swash plate support 11, and this peeling is performed. There is a possibility that the bearing metals 14 and 15 may fall off the tilt support surfaces 11A and 11B due to the force.

  Therefore, in the first embodiment, the strips 12A, 12B of the swash plate 12 extend in a concave curve along the tilting support surfaces 11A, 11B of the swash plate support 11 in which the legs 12A, 12B are slidably contacted. While rotating the friction stir welding tool 16, the bearing metal 14, 15 is made to push the tip end 16 </ b> A toward the tilt support surfaces 11 </ b> A, 11 </ b> B in the vertical direction, thereby causing the tilt support surfaces 11 </ b> A, 11B is joined in a plastic flow state.

  In this case, one bearing metal 14 out of the bearing metals 14 and 15 has a plurality of joint portions 14A joined to the tilt support surface 11A of the swash plate support 11 by a friction stir welding tool 16 in a row. A non-bonding covering portion 14B that covers the tilt support surface 11A from the outside in a surface contact state without being bonded to the tilt support surface 11A is formed around each joint portion 14A. be able to.

  Further, the other bearing metal 15 has a joint 15A that is joined to the tilt support surface 11B of the swash plate support 11 by the tool 16 in a shape that is elongated and linear along the tilt support surface 11B. A non-bonding covering portion 15B that covers the tilt support surface 11B from the outside in a surface contact state without being bonded to the tilt support surface 11B is formed around the joint portion 15A. Can do.

  Thereby, one bearing metal 14 can be stably joined to the tilt support surface 11A of the swash plate support 11 in a plastic flow state by friction stirring, and the other one to the tilt support surface 11B. The bearing metal 15 can be stably joined in a plastic flow state. As a result, it is possible to prevent the bearing metals 14 and 15 from being separated from the tilting support surfaces 11A and 11B of the swash plate support 11 along with the tilting operation of the swash plate 12 over a long period of time. 15 durability, life, and reliability can be improved.

  Therefore, according to the present embodiment, the bearing metals 14 and 15 formed of the band-like bodies extending in a concave curve along the tilt support surfaces 11A and 11B of the swash plate support 11 are used as the tilt support surfaces 11A and 11B. By using the friction stir welding means when joining to the bearing, it becomes possible to join in a short time with a small-scale facility, and to increase the joining strength of the bearing metals 14 and 15 to the tilt support surfaces 11A and 11B by a simple method. Can do.

  In addition, the leg portions 12A and 12B of the swash plate 12 can be smoothly slidably brought into sliding contact with the tilt support surfaces 11A and 11B of the swash plate support 11 via the bearing metals 14 and 15, so that the swash plate 12 can be tilted. The operation can be stabilized. As a result, the reliability of the variable displacement swash plate hydraulic pump 1 can be improved, and the durability and lifespan thereof can be increased.

  In the first embodiment, the bearing metal 14 is provided on one tilt support surface 11A side of the tilt support surfaces 11A and 11B of the swash plate support 11, and the other tilt support surface is provided. The case where the bearing metal 15 is provided on the 11B side is described as an example. However, the present invention is not limited to this. For example, a bearing metal 15 having one joint 15A is provided on one tilt support surface 11A side, and a plurality of joints 14A are provided on the other tilt support surface 11B side. It is good also as a structure which provides the bearing metal 14 which has.

  That is, which of the tilt support surfaces 11A and 11B is to be bonded to which of the bearing metals 14 and 15, the shape, the number, etc. of the joint portions 14A and 15A formed on the bearing metals 14 and 15 are as follows. The load applied from the legs 12A and 12B of the swash plate 12 toward the tilt support surfaces 11A and 11B of the swash plate support 11 (that is, the hydraulic pressure generated in each cylinder 6), the swash plate 12 is tilted. The structure may be appropriately selected according to the sliding resistance, torsional force, and the like when rolling.

  Next, FIG. 7 to FIG. 10 show a second embodiment of the present invention. The feature of the present embodiment is that a band-like insert member is provided between the tilt support surface of the swash plate support portion and the bearing member. The configuration is such that it is provided by insertion. In the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  In the figure, reference numerals 31 and 32 denote bearing metals as bearing members employed in the second embodiment. The bearing metals 31 and 32 are substantially the same as the bearing metals 14 and 15 described in the first embodiment. It is configured. However, the bearing metals 31 and 32 in this case are the first embodiment in that insert metals 33 and 34 (described later) are interposed between the tilt support surfaces 11A and 11B of the swash plate support 11. It is different from the form.

  For this reason, the joint portions 31A and 32A of the bearing metals 31 and 32 are formed on the tilt support surfaces 11A and 11B of the swash plate support 11 together with the insert metals 33 and 34, which will be described later, as shown in FIGS. On the other hand, it is joined in a plastic flow state. That is, on one bearing metal 31, a total of six joints 31A are formed as circular joint marks by the friction stir welding tool 16 shown in FIG. 8, and each of these joints 31A is formed on the swash plate 12. Are arranged in a line along the tilt support surface 11A extending in the tilt direction. In addition, around each joint 31A, the tilt support surface 11A is inserted from the outside together with the insert metal 33 without being joined to the insert metal 33 described later and the tilt support surface 11A of the swash plate support 11. A non-bonding covering portion 31 </ b> B that covers the surface contact state is formed.

  On the other bearing metal 32, two joint portions 32A are formed in a shape that is elongated in a straight line parallel to each other along the tilt support surface 11B. However, the friction stir welding tool for forming the joint portion 32A in this case has a shape that is narrower than the tip portion 16A of the tool 16 shown in FIG. 8, and for this reason, each joint portion 32A has its The width dimension is narrow. Further, the bearing metal 32 is formed with a non-bonding coating portion 32B located around the bonding portion 32A, and the non-bonding coating portion 32B includes an insert metal 34 and a tilt support surface 11B of the swash plate support 11 which will be described later. The tilt support surface 11B is covered in a surface contact state from the outside together with the insert metal 33 without being bonded to.

  33 and 34 are insert metals as insert members provided between the tilting support surfaces 11A and 11B of the swash plate support 11 and the bearing metals 31 and 32, respectively. The insert metals 33 and 34 are formed of a thin metal plate (for example, including a thin metal foil and a metal sheet such as an aluminum foil) made of an alloy of iron and nickel, a copper alloy, or the like. That is, the insert metals 33 and 34 contain an element that improves the bondability between the tilting support surfaces 11A and 11B and the bearing metals 31 and 32, and enhances the bondability between them. The insert metals 33 and 34 are formed as belt-like sheets that are interposed between the tilt support surfaces 11A and 11B and the bearing metals 31 and 32 and extend in a concave curve along the tilt support surfaces 11A and 11B.

  Here, when one joining metal 33 forms each joining part 31A in the bearing metal 31 using the tool 16 for friction stir welding as shown in FIG. 11 tilt support surfaces 11A are joined in a plastic flow state. Further, the other insert metal 34 supports the swash plate together with the bearing metal 32 when each joint portion 32A is formed in the bearing metal 32 using a tool (not shown) similar to the tool 16 shown in FIG. The body 11 is joined to the tilt support surface 11B in a plastic flow state.

  Thus, also in the second embodiment configured as described above, the bearing metals 31 and 32 can be joined to the tilt support surfaces 11A and 11B of the swash plate support 11 by using the friction stir welding means. It is possible to obtain substantially the same operational effects as those of the first embodiment. Particularly, in the second embodiment, the insert metals 33 and 34 are inserted between the tilt support surfaces 11A and 11B of the swash plate support 11 and the bearing metals 31 and 32.

  Therefore, the bearing metals 31 and 32 and the insert metals 33 and 34 are joined together in the plastic flow state to the tilting support surfaces 11A and 11B of the swash plate support 11 using the friction stir welding tool 16 or the like. In addition, the insert metal 33, 34 can enhance the joining property between the tilt support surfaces 11A, 11B and the bearing metals 31, 32. Thus, by using the insert metals 33 and 34, it is possible to further increase the bonding strength to the tilt support surfaces 11A and 11B while maintaining the properties as the bearing metals 31 and 32. Moreover, workability | operativity when forming junction part 31A, 32A can be improved.

  For the bearing metals 31 and 32 described in the second embodiment, for example, the bearing metal 32 having two joint portions 32A is supported by a swash plate, as in the modification of the first embodiment described above. It is good also as a structure which provides the bearing metal 31 which has a several junction part 31A in the one inclination support surface 11A side of the body 11, and the other inclination support surface 11B side.

  Next, FIG. 11 to FIG. 14 show a third embodiment of the present invention. The feature of this embodiment is that each joint portion formed in the bearing member is recessed more concavely than the surrounding non-joint covering portion. It is in the structure which does not form. Note that in the third embodiment, the same components as those in the first embodiment described above are denoted by the same reference numerals, and description thereof is omitted.

  In the figure, reference numerals 41 and 42 denote bearing metals as bearing members employed in the third embodiment. The bearing metals 41 and 42 are substantially the same as the bearing metals 14 and 15 described in the first embodiment. It is configured. However, the bearing metals 41 and 42 in this case are the same as those in the first embodiment in that joint portions 41A and 42A described later are formed to be recessed more concave than the surrounding non-joint coating portions 41B and 42B. Is different.

  That is, one bearing metal 41 has a total of four joint portions 41A by a friction stir welding tool (not shown), and the tilt direction of the swash plate 12 (ie, the direction along the tilt support surface 11A). ) In the shape of an ellipse extending in a direction perpendicular to the vertical direction. However, the friction stir welding tool for forming the joint portion 41A in this case has a shape that is thinner than the tip portion 16A of the tool 16 shown in FIG. The width dimension is narrow.

  On one bearing metal 41, each of the joint portions 41A having an oval shape as described above is disposed at a distance from each other in the direction along the tilt support surface 11A. Further, a non-bonding covering portion 41B that covers the tilt support surface 11A from the outside in a surface contact state without being bonded to the tilt support surface 11A of the swash plate support 11 is formed around each joint portion 41A. Has been.

  Then, as shown in FIG. 12 and FIG. 14, each joint 41A is formed to be recessed in a concave shape from the surrounding non-joining covering part 41B, and thereby, on the surface side of each joint 41A. Recessed portions 41C that are recessed in a concave shape with respect to the surrounding non-bonded covering portion 41B are formed. These concave portions 41 </ b> C have a function of holding, as lubricating oil, the pressure oil supplied through, for example, the oil guide passage 20 formed in the swash plate support 11.

  Further, a total of five joint portions 42A are formed as circular joint marks on the other bearing metal 42 by a tool (not shown) similar to the friction stir welding tool 16 illustrated in FIG. 42A are arranged in a line along the tilt support surface 11B extending in the tilt direction of the swash plate 12. Further, the bearing metal 42 is formed with a non-bonding covering portion 42B located around each of the bonding portions 42A, and the non-bonding covering portion 42B is bonded to the tilt support surface 11B of the swash plate support 11. Without tilting, the tilting support surface 11B is covered in a surface contact state from the outside.

  Further, as shown in FIGS. 13 and 14, each joint 42A is formed to be recessed in a concave shape rather than the surrounding non-joining covering part 42B, and thus, on the surface side of each joint 42A. The concave portions 42C that are recessed in a concave shape with respect to the surrounding non-bonding covering portions 42B are formed. These concave portions 42 </ b> C have a function of holding, for example, pressure oil supplied via the oil guide passage 20 formed in the swash plate support 11 as lubricating oil.

  Further, even in the third embodiment, as described above, a plurality of joints 41A and recesses 41C are formed in one bearing metal 41 using the friction stir welding tool, and the other bearing metal 42 is also formed. After the plurality of joint portions 42A and the concave portions 42C are formed, a finishing process using, for example, a grinding means or a polishing means is performed on the surface side of the bearing metals 41 and 42. As a result, the surfaces of the bearing metals 41 and 42 (surfaces on which the leg portions 12A and 12B of the swash plate 12 are slidably contacted so as to be tiltable) are formed as uniform smooth surfaces leaving the recesses 41C and 42C.

  Thus, also in the third embodiment configured as described above, the bearing metals 41 and 42 can be joined to the tilting support surfaces 11A and 11B of the swash plate support 11 using the friction stir welding means. It is possible to obtain substantially the same operational effects as those of the first embodiment. In particular, in the third embodiment, the joint portions 41A and 42A of the bearing metals 41 and 42 are recessed in a concave shape with respect to the surrounding non-joint covering portions 41B and 42B to form the recess portions 41C and 42C.

  Therefore, for example, a part of the lubricating oil supplied through the oil guide passage 20 shown by a two-dot chain line in FIG. 12 is moved into the concave portions 41C and 42C of the joint portions 41A and 42A. The lubricating oil can be held in the recesses 41C and 42C to form an oil film, and the sliding between the leg portions 12A and 12B of the swash plate 12 and the bearing metals 41 and 42 can be performed. The moving surface can be kept in a lubricated state by the oil film.

  For the bearing metals 41 and 42 described in the third embodiment, for example, the bearing metal 42 having a plurality of joints 42A is replaced by a swash plate support, as in the modification of the first embodiment described above. 11 is provided on one tilt support surface 11A side, and the other tilt support surface 11B side may be provided with a bearing metal 41 having a plurality of joint portions 41A.

  Next, FIG. 15 and FIG. 16 show a fourth embodiment of the present invention. The feature of this embodiment is that each joint formed on the bearing member is inclined obliquely with respect to the inclination direction of the swash plate. In other words, the structure is formed so as to extend in a certain direction. Note that in the fourth embodiment, the same components as those in the first embodiment described above are denoted by the same reference numerals, and description thereof is omitted.

  In the figure, reference numerals 51 and 52 denote bearing metals as bearing members employed in the fourth embodiment. The bearing metals 51 and 52 are substantially the same as the bearing metals 14 and 15 described in the first embodiment. It is configured. However, the bearing metal 51, 52 in this case is different from the first embodiment in that each of the joints 51A, 52A described later is formed so as to extend obliquely.

  That is, one bearing metal 51 has a total of five joints 51A by a friction stir welding tool (not shown), and the tilt direction of the swash plate 12 (that is, the direction along the tilt support surface 11A). ) In an obliquely inclined direction and is formed in an oval shape. And each joint part 51A which makes an ellipse shape is arrange | positioned at intervals in parallel with each other. Further, a non-bonding covering portion 51B that covers the tilt support surface 11A from the outside in a surface contact state without being bonded to the tilt support surface 11A of the swash plate support 11 is formed around each joint portion 51A. Has been.

  Similarly, the other bearing metal 52 is provided with an oblong joint portion 52A inclined obliquely and a non-joining covering portion 52B positioned around each joint portion 52A. However, the joint portions 51A of the bearing metal 51 and the joint portions 52A of the bearing metal 52 are arranged in a positional relationship that is symmetrical left and right with the shaft insertion hole 11C of the swash plate support 11 interposed therebetween as shown in FIG. Has been.

  Thus, also in the fourth embodiment configured as described above, the bearing metals 51 and 52 can be joined to the tilting support surfaces 11A and 11B of the swash plate support 11 using the friction stir welding means. It is possible to obtain substantially the same operational effects as those of the first embodiment. In particular, in the fourth embodiment, the joint portions 51A and 52A of the bearing metals 51 and 52 can be formed to extend in a direction inclined obliquely with respect to the inclination direction of the swash plate 12.

  Accordingly, the peeling force acting on the bearing metals 51 and 52 accompanying the tilting operation of the swash plate 12, that is, the force for peeling the bearing metals 51 and 52 from the tilting support surfaces 11A and 11B is taken into consideration. The inclination direction in which the portions 51A and 52A extend can be appropriately selected. As a result, the bearing metal 51, 52 can be prevented from peeling off from the tilt support surfaces 11A, 11B by selecting the shape or the like of each joint 51A, 52A. Durability, life, and reliability can be improved.

  Next, FIG. 17 and FIG. 18 show a fifth embodiment of the present invention. The feature of this embodiment is that the joint formed on the bearing member is extended in a direction parallel to the tilting direction of the swash plate. The configuration is to be formed. Note that in the fifth embodiment, the same components as those in the first embodiment described above are denoted by the same reference numerals, and description thereof is omitted.

  In the figure, 61 and 62 are bearing metals as bearing members employed in the fifth embodiment, and the bearing metals 61 and 62 are substantially the same as the bearing metals 14 and 15 described in the first embodiment. It is configured. However, the bearing metals 61 and 62 in this case are different from the first embodiment in that joints 61A and 62A described later are formed extending in a direction parallel to the tilting direction of the swash plate 12. ing.

  That is, on one bearing metal 61, one joint 61A is tilted by a tool for friction stir welding (not shown), and the tilt direction of the swash plate 12 (that is, the direction along the tilt support surface 11A). It is elongated and formed. Further, there is a non-bonding covering portion 61B that covers the tilt support surface 11A in a surface contact state from the outside without being bonded to the tilt support surface 11A of the swash plate support 11 around one joint portion 61A. Is formed.

  Further, the other bearing metal 62 is formed with two joint portions 62 </ b> A parallel to the tilting direction of the swash plate 12 and shifted in the same direction. Further, a non-bonding covering portion 62B that covers the tilt support surface 11B from the outside in a surface contact state without being bonded to the tilt support surface 11B of the swash plate support 11 is formed around each joint portion 62A. Has been.

  Thus, also in the fifth embodiment configured as described above, the bearing metals 61 and 62 can be joined to the tilt support surfaces 11A and 11B of the swash plate support 11 using the friction stir welding means. It is possible to obtain substantially the same operational effects as those of the first embodiment. In particular, in the fifth embodiment, the joint portions 61A and 62A of the bearing metals 61 and 62 can be formed to extend in a direction parallel to the tilting direction of the swash plate 12.

  Accordingly, the leg portions 12A and 12B of the swash plate 12 can be tilted in the extending direction of the joint portions 61A and 62A, and the tilting operation at this time can be performed smoothly. As a result, the separation of the bearing metals 61 and 62 from the tilt support surfaces 11A and 11B can be suppressed by selecting the shape of each joint 61A and 62A. Durability, life, and reliability can be improved.

  For the bearing metals 61 and 62 described in the fifth embodiment, for example, the bearing metal 62 having the joint 62A is replaced with the swash plate support 11 in the same manner as the change in the first embodiment described above. It is good also as a structure which provides the bearing metal 61 which has 61 A of junction parts in the one inclination support surface 11A side and the other inclination support surface 11B side.

  Next, FIG. 19 shows a sixth embodiment of the present invention. The feature of this embodiment is that a joint formed on the bearing member is extended in a direction perpendicular to the tilting direction of the swash plate. The configuration is to be formed. Note that in the sixth embodiment, the same components as those in the first embodiment described above are denoted by the same reference numerals, and descriptions thereof are omitted.

  In the figure, reference numerals 71 and 72 denote bearing metals as bearing members employed in the sixth embodiment. The bearing metals 71 and 72 are substantially the same as the bearing metals 14 and 15 described in the first embodiment. It is configured. However, the bearing metals 71 and 72 in this case are the first embodiment in that each of the joints 71A and 72A described later is formed in an oval shape extending in a direction perpendicular to the tilting direction of the swash plate 12. It is different from the form.

  That is, on one bearing metal 71, three joints 71A are tilted by a tool for friction stir welding (not shown), and the tilt direction of the swash plate 12 (that is, the direction along the tilt support surface 11A). The joining portions 71A are arranged at intervals in the direction along the tilt support surface 11A. Further, a non-bonding covering portion 71B that covers the tilt support surface 11A from the outside in a surface contact state without being bonded to the tilt support surface 11A of the swash plate support 11 is formed around each joint portion 71A. Has been.

  The other bearing metal 72 is formed with a plurality of (for example, a total of four) joints 72A that are elongated in a direction perpendicular to the tilting direction of the swash plate 12, and each of the joints 72A is also formed of the swash plate 12. They are spaced apart from each other in the tilt direction. Further, a non-bonding covering portion 72B that covers the tilt support surface 11B from the outside in a surface contact state without being bonded to the tilt support surface 11B of the swash plate support 11 is formed around each joint portion 72A. Has been.

  Thus, also in the sixth embodiment configured as described above, the bearing metals 71 and 72 can be joined to the tilting support surfaces 11A and 11B of the swash plate support 11 by using the friction stir welding means. It is possible to obtain substantially the same operational effects as those of the first embodiment. In particular, in the sixth embodiment, the joint portions 71A, 72A of the bearing metals 71, 72 can be formed to extend in a direction perpendicular to the tilting direction of the swash plate 12.

  For the bearing metals 71 and 72 described in the sixth embodiment, for example, the bearing metal 72 having the joining portion 72A is replaced with the swash plate support 11 in the same manner as the modification of the first embodiment described above. It is good also as a structure which provides the bearing metal 71 which has 71 A of joining parts in the one inclination support surface 11A side and the other inclination support surface 11B side.

  Next, FIG. 20 shows a seventh embodiment of the present invention. The feature of this embodiment is that a plurality of joints formed on the bearing member are formed in a circular spot shape, for example. It is in. Note that in the seventh embodiment, the same components as those in the first embodiment described above are denoted by the same reference numerals, and descriptions thereof are omitted.

  In the figure, reference numerals 81 and 82 denote bearing metals as bearing members adopted in the seventh embodiment, and the bearing metals 81 and 82 are substantially the same as the bearing metals 14 and 15 described in the first embodiment. It is configured. However, the bearing metals 81 and 82 in this case are different from those of the first embodiment in that joints 81A, 81B, and 82A described later are formed in a circular spot shape.

  That is, a total of four joints 81A and a total of four joints 81B are provided on one bearing metal 81 by a friction stir welding tool (not shown). In the direction along the tilting support surface 11A) and arranged with a space between each other, and each joint 81A and each joint 81B are separated from each other in a direction perpendicular to the tilting direction of the swash plate 12. Are arranged.

  Here, each joining part 81A and each joining part 81B are formed in a circular shape with mutually different diameter dimensions, and are arranged in a spot shape as a whole. Further, there is a non-joining covering portion 81C that covers the tilt support surface 11A in a surface contact state from the outside without being bonded to the tilt support surface 11A of the swash plate support 11 around each of the joint portions 81A and 81B. Is formed.

  The other bearing metal 82 has a plurality of (for example, a total of three) joint portions 82A arranged in a direction perpendicular to the tilting direction of the swash plate 12, and each of the one set of these sets. A plurality of sets (for example, four sets) of the joint portions 82A are arranged at intervals in the tilting direction of the swash plate 12. In addition, a non-bonding covering portion 82B that covers the tilt support surface 11B in a surface contact state from the outside without being bonded to the tilt support surface 11B of the swash plate support 11 is formed around each joint portion 82A. Has been.

  Thus, also in the seventh embodiment configured as described above, the bearing metals 81 and 82 can be joined to the tilting support surfaces 11A and 11B of the swash plate support 11 using the friction stir welding means. It is possible to obtain substantially the same operational effects as those of the first embodiment. In particular, in the seventh embodiment, a plurality of joints 81A and 81B can be formed on one bearing metal 81 in a spot shape with a space between each other, and the other bearing metal 82 can also be formed with a plurality of joints. It is possible to form the joining portions 82A in a row by arranging them in a spot shape at intervals.

  For the bearing metals 81 and 82 described in the seventh embodiment, for example, the bearing metal 82 having the joining portion 82A is replaced with the swash plate support 11 in the same manner as the change in the first embodiment described above. It is good also as a structure which provides in the one inclination support surface 11A side, and provides the bearing metal 81 which has joining part 81A, 81B in the other inclination support surface 11B side.

  Next, FIG. 21 shows an eighth embodiment of the present invention. The feature of this embodiment is that the joint portion formed on the bearing member is formed in a rectangular frame shape, for example. is there. In the eighth embodiment, the same components as those in the first embodiment described above are denoted by the same reference numerals, and description thereof is omitted.

  In the figure, 91 and 92 are bearing metals as bearing members employed in the eighth embodiment, and the bearing metals 91 and 92 are substantially the same as the bearing metals 14 and 15 described in the first embodiment. It is configured. However, the bearing metals 91 and 92 in this case are different from those of the first embodiment in that joints 91A and 92A, which will be described later, are formed in a rectangular frame shape.

  That is, on one bearing metal 91, a joining portion 91A having a rectangular frame shape by a friction stir welding tool (not shown), and a tilting direction of the swash plate 12 located inside the joining portion 91A are provided. A total of two joining portions 91B extending vertically and one joining portion 91C having a circular spot shape located between the joining portions 91B are formed. Further, on the inner side and the outer side of the joint portion 91A, the tilt support surface 11A is faced from the outside without being joined to the tilt support surface 11A of the swash plate support 11 located around the joint portions 91B and 91C. A non-bonding covering portion 91D that covers the contact state is formed.

  Further, the other bearing metal 92 includes a joint portion 92A having a quadrangular frame shape, and a total of three narrow portions located inside the joint portion 92A and extending perpendicularly to the tilting direction of the swash plate 12. A junction 92B is formed. Further, on the inner side and the outer side of the joint portion 92A, the tilt support surface 11B is in surface contact from the outside without being joined to the tilt support surface 11B of the swash plate support 11 located around each joint portion 92B. A non-bonding covering portion 92C that is covered with is formed.

  Thus, also in the eighth embodiment configured as described above, the bearing metals 91 and 92 can be joined to the tilt support surfaces 11A and 11B of the swash plate support 11 using the friction stir welding means. It is possible to obtain substantially the same operational effects as those of the first embodiment. In particular, in the eighth embodiment, one bearing metal 91 has a rectangular frame-shaped joint portion 91A, and is positioned inside the joint portion 91A and extends perpendicular to the tilting direction of the swash plate 12. A narrow joint portion 91B and a joint portion 91C having a small circular spot shape can be formed.

  Also, the other bearing metal 92 includes a joint portion 92A having a quadrangular frame shape, and a narrow joint portion 92B located inside the joint portion 92A and extending perpendicularly to the tilting direction of the swash plate 12. Can be easily formed. Accordingly, the leg portions 12A and 12B of the swash plate 12 can be tilted in the extending direction of the joint portions 91A and 92A, and the tilting operation at this time can be performed smoothly. Further, the bearing metals 91 and 92 can be prevented from peeling off from the tilting support surfaces 11A and 11B by selecting the shape of each joint, and the durability and life of the bearing metals 91 and 92 can be suppressed. , Reliability can be improved.

  Note that, for the bearing metals 91 and 92 described in the eighth embodiment, for example, the bearing metal 92 having the joint portions 92A and 92B is replaced with the swash plate support, similarly to the modification of the first embodiment described above. 11 may be provided on one tilt support surface 11A side, and a bearing metal 91 having joints 91A, 91B, 91C may be provided on the other tilt support surface 11B side.

  Next, FIG. 22 to FIG. 24 show a ninth embodiment of the present invention. The feature of this embodiment is that the opening side of the oil guide passage is surrounded from the outside by a joint formed on the bearing member. It is to have done. Note that, in the ninth embodiment, the same components as those in the first embodiment described above are denoted by the same reference numerals, and description thereof is omitted.

  In the figure, reference numerals 101 and 102 denote bearing metals as bearing members employed in the ninth embodiment. The bearing metals 101 and 102 are substantially the same as the bearing metals 14 and 15 described in the first embodiment. It is configured. However, the bearing metals 101 and 102 in this case are different from the first embodiment in the shapes of joints 101A, 101B, 102A, and 102B described later.

  That is, one bearing metal 101 has two thin joint portions 101A extending in a direction parallel to the tilting direction of the swash plate 12 by a friction stir welding tool (not shown), A small-diameter cylindrical joint portion 101B that is disposed at an intermediate position between the joint portions 101A and surrounds a communication hole 103B described later from the outside is formed. Further, a non-bonding covering portion 101C that covers the tilt support surface 11A from the outside in a surface contact state without being bonded to the tilt support surface 11A of the swash plate support 11 is formed around each of the joint portions 101A and 101B. Has been.

  Further, the other bearing metal 102 includes a joint portion 102A having a rectangular frame shape, and a total of three narrow portions located inside the joint portion 102A and extending perpendicularly to the tilting direction of the swash plate 12. A junction 102B is formed. Further, on the inner side and the outer side of the joint portion 102A, the tilt support surface 11B is in surface contact from the outside without being joined to the tilt support surface 11B of the swash plate support 11 located around each joint portion 102B. A non-bonding covering portion 102 </ b> C covered with is formed.

  103 and 104 are oil guide passages formed in the swash plate support 11, and the oil guide passages 103 and 104 are the second oil guide passages 20 described in the first embodiment (two-dot chain lines in FIG. 5). The base end side of the first oil guide passage 19 (see FIG. 1) serves as connection ends 103A and 104A. Note that the oil guide passages 103 and 104 may be configured such that, for example, the connection ends 103A and 104A communicate with each other through a single passage, or may be configured to be connected to the first oil guide passage 19 separately. .

  Further, the leading end side of the oil guide passage 103 is a communication hole 103B formed in the bearing metal 101 so as to open on the surface of the bearing metal 101 as shown in FIG. The communication hole 103B is surrounded by a joint 101B of the bearing metal 101 as shown in FIG. For this reason, the pressure oil (lubricating oil) flowing in the oil guide passage 103 is a superposed surface (contact surface) between the tilt support surface 11A of the swash plate support 11 and the non-bonding covering portion 101C of the bearing metal 101. Can be prevented by a small-diameter cylindrical joint 101B.

  On the other hand, the leading end side of the oil guide passage 104 is a communication hole 104B formed in the bearing metal 102 so as to open to the surface of the bearing metal 102 as shown in FIG. As shown in FIG. 22, the communication hole 104B is surrounded by a joint 102A of the bearing metal 102 and two joints 102B. For this reason, the pressure oil (lubricating oil) flowing in the oil guide passage 104 is a superposed surface (contact surface) between the tilt support surface 11B of the swash plate support 11 and the non-bonding coating portion 102C of the bearing metal 102. Can be prevented by the joints 102A and 102B.

  Thus, also in the ninth embodiment configured as described above, the bearing metals 101 and 102 can be joined to the tilting support surfaces 11A and 11B of the swash plate support 11 using the friction stir welding means. It is possible to obtain substantially the same operational effects as those of the first embodiment.

  In particular, in the ninth embodiment, the lubricating oil from the oil guide passage 103 is surrounded by surrounding the communication hole 103B of the oil guide passage 103 formed in one bearing metal 101 with a small-diameter cylindrical joint portion 101B. Can be prevented from entering and leaking between the tilting support surface 11A and the bearing metal 101. On the other side of the bearing metal 102, the communication hole 104B of the oil guide passage 104 is surrounded by the joint 102A and the two joints 102B from the outside, so that the lubricating oil from the oil guide passage 104 is tilted and supported. Intrusion and leakage between the surface 11B and the bearing metal 102 can be prevented.

  As a result, even if a minute gap is formed between the non-bonding covering portions 101C and 102C of the bearing metals 101 and 102 and the tilt support surfaces 11A and 11B of the swash plate support portion 11, the communication holes 103B and 104B are formed. Is surrounded by a joint portion, so that the pressure oil from the oil guide passages 103 and 104 can be prevented from leaking into the gap, and the leg portions 12A and 12B of the swash plate 12 and the bearing metals 101 and 102 are A sufficient amount of pressure oil (lubricating oil) can be supplied to the inclined sliding surface. Further, the bearing metal 101, 102 can be prevented from peeling off from the tilt support surfaces 11A, 11B by selecting the shape of each joint, etc., and the durability and life of the bearing metal 101, 102 can be suppressed. , Reliability can be improved.

  In the bearing metals 101 and 102 described in the ninth embodiment, for example, the bearing metal 102 having the joint portions 102A and 102B is replaced by a swash plate support, as in the modification of the first embodiment described above. 11 may be provided on the one tilt support surface 11A side and the other tilt support surface 11B side may be provided with a bearing metal 101 having joint portions 101A and 101B.

  In the first embodiment, the case where the bearing metals 14 and 15 are provided on the tilt support surfaces 11A and 11B of the swash plate support 11 has been described as an example. However, the present invention is not limited to this, and for example, a bearing member formed as a strip from a polymer resin material is joined to the tilt support surfaces 11A and 11B of the swash plate support 11 in a plastic flow state. It is good also as a structure. This also applies to the second to ninth embodiments.

  In the second embodiment, the case where the insert metals 33 and 34 are interposed between the tilt support surfaces 11A and 11B of the swash plate support 11 and the bearing metals 31 and 32 will be described as an example. did. However, the present invention is not limited to this. For example, an insert member formed as a strip from a resin material is provided between the tilt support surfaces 11A and 11B of the swash plate support 11 and the bearing metals 31 and 32. It is good also as a structure. The first to third to ninth embodiments may also be configured to be provided with insert members such as the insert metals 33 and 34 interposed therebetween.

  As for the first, second, and fourth to ninth embodiments, similarly to the joint portions 41A and 42A and the surrounding non-joining covering portions 41B and 42B described in the third embodiment, It is good also as a structure which forms a junction part indented rather than the surrounding non-joining coating | covering part.

  In the first embodiment, the case where one side of the first oil guide passage 19 provided in the casing 2 is connected to the supply / discharge passage 3B on the high pressure side on the rear casing 2C side is described as an example. . However, the present invention is not limited to this. For example, one side of the oil guide passage 19 is connected to another hydraulic pump including a low-pressure pilot pump, and the swash plate 12 is tilted and slid by the pressure oil supplied from these pumps. It is good also as a structure which lubricates a moving surface. This also applies to the second to ninth embodiments.

  Further, in each of the above-described embodiments, the case where the variable displacement swash plate type hydraulic rotating machine is applied to the swash plate type hydraulic pump 1 has been described as an example. However, the application target of the present invention is not limited to the variable displacement swash plate hydraulic pump, and may be applied to a variable displacement swash plate hydraulic rotary machine such as a swash plate hydraulic motor.

1 Hydraulic pump (variable displacement swash plate type hydraulic rotating machine)
2 Casing 3A, 3B Supply / exhaust passage 4 Rotating shaft 5 Cylinder block 6 Cylinder 7 Piston 8 Shoe 10 Valve plate 11 Swash plate support (swash plate support)
11A, 11B Tilt support surface 12 Swash plate 12A, 12B Leg 12C Smooth surface 12D Through hole 14, 15, 31, 32, 41, 42, 51, 52, 61, 62, 71, 72, 81, 82, 91 , 92, 101, 102 Bearing metal (bearing member)
14A, 15A, 31A, 32A, 41A, 42A, 51A, 52A, 61A, 62A, 71A, 72A, 81A, 81B, 82A, 91A, 91B, 91C, 92A, 92B, 101A, 101B, 102A, 102B Joint 14B , 15B, 31B, 32B, 41B, 42B, 51B, 52B, 61B, 62B, 71B, 72B, 81C, 82B, 91D, 92C, 101C, 102C Non-bonded coating 16 Tool for friction stir welding 17, 18 Tilt Actuator 17B, 18B Hydraulic chamber 17C, 18C Tilt piston 19 First oil guide passage 20 Second oil guide passage 33, 34 Insert metal (insert member)
41C, 42C Concave portion 103, 104 Oil guide passage 103B, 104B Communication hole

Claims (6)

A cylindrical casing provided with a swash plate support on one side and a pair of supply / exhaust passages on the other side, a rotary shaft rotatably provided on the casing, and a rotary shaft that rotates integrally with the rotary shaft A cylinder block having a plurality of cylinders extending in the axial direction and spaced apart in the circumferential direction, a plurality of pistons removably fitted in the cylinders of the cylinder block, and the cylinders A plurality of shoes mounted on the projecting end side of each piston projecting from the front surface, and a front surface side which is a smooth surface for slidably guiding each shoe, and a rear surface side which is tiltably supported by the swash plate support portion. A plate and a tilt actuator that tilts and drives the swash plate by supplying and discharging a tilt control pressure from outside.
A pair of legs are provided on the rear surface side of the swash plate so as to be spaced apart from each other across the rotation shaft and project in a convex curve toward the swash plate support, and the swash plate support is provided with the pair of legs. In a variable capacity swash plate type hydraulic rotating machine that is provided with a pair of tilt support surfaces that are formed in a concave curved shape corresponding to the leg portions and support the swash plate so as to be tiltable via the leg portions,
At least one tilt support surface of the tilt support surfaces of the swash plate support portion is formed of a belt-like body extending in a concave curve along the surface in which the leg portion of the swash plate is slidably contacted. A bearing member,
The bearing member is configured to be joined to the tilted support surface in a plastic flow state by pressing toward the tilted support surface of the swash plate support portion while rotating the friction stir welding tool. Variable capacity swash plate type hydraulic rotating machine.   Between the tilt support surface of the swash plate support portion and the bearing member, a belt-like insert member is provided that extends between the two and extends in a concave curve along the tilt support surface. 2. The variable capacity swash plate type hydraulic rotating machine according to claim 1, wherein the friction stir welding tool is used to join the tilt support surface together with the insert member in a plastic flow state.   The bearing member has one or a plurality of joints joined to the tilt support surface by the friction stir welding tool, and is located around the joint and joined to the tilt support surface. The variable capacity type swash plate type hydraulic rotating machine according to claim 1 or 2, wherein a non-bonding covering portion that covers the tilting support surface from the outside without being provided is provided.   The joint for friction stir welding the bearing member to the tilt support surface is a direction parallel to the tilt direction of the swash plate relative to the swash plate support, a direction perpendicular to the tilt direction, or the tilt. The variable capacity swash plate type hydraulic rotating machine according to claim 3, wherein the variable capacity swash plate type hydraulic rotating machine is configured to extend in a direction inclined obliquely with respect to the rolling direction.   5. The variable capacity swash plate type hydraulic rotating machine according to claim 3, wherein the joint portion of the bearing member is formed so as to be recessed in a concave shape with respect to the non-joining covering portion positioned around the bearing member.   The casing is provided with an oil guide passage extending between the swash plate and the swash plate support portion to keep the inclined sliding surfaces thereof in a lubricated state, and the bearing member includes the oil guide passage. A communication hole that opens in a tilting sliding surface with the swash plate is provided, and the joint portion is formed so as to surround the periphery of the opening portion of the communication hole. The variable capacity swash plate type hydraulic rotating machine described.

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