CN201190640Y

CN201190640Y - Axial plunger type hydraulic motor or pump

Info

Publication number: CN201190640Y
Application number: CNU2008200767526U
Authority: CN
Inventors: 焦正科
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-05-12
Filing date: 2008-05-12
Publication date: 2009-02-04
Anticipated expiration: 2018-05-12

Abstract

An axial plunger hydraulic motor or pump comprises a transmission shaft, a shell body, a tilting tray, a cylinder body, a plunger, a port plate and a spring. The utility model is characterized in that a sealing member arranged at the bottom end of each plunger hole and a lining plate arranged between the cylinder body and the port plate are also included; the lining plate on the port plate is compressed to be fixedly connected with the cylinder body into a whole. The protrusion end of each spring is limited by the sealing member at the bottom end of the corresponding plunger hole, each sealing member has a center hole communicated with the plunger hole, the lining plate at the position corresponding to the center hole of each sealing member is provided with and oil inlet and an outlet protrusion hole, the oil inlet protrusion hole and the outlet protrusion hole on the lining plate correspond to and are communicated with the center holes on each sealing member, the oil inlet and the oil outlet at the bottom end of each plunger hole are the combination of the center hole of the sealing member arranged at the bottom end of the plunger hole and one oil inlet and outlet protrusion hole on the corresponding lining plate. The utility model can simplify the structure of the cylinder body so as to reduce materials and processing costs and improve the processing precision.

Description

Axial-piston hydraulic motor or pump

Technical field

The utility model relates to a kind of axial-piston hydraulic motor or pump.

Background technique

Existing axial-piston hydraulic motor or pump have transmission shaft a, housing g, swash plate b, cylinder body d, plunger c, thrust plate f, spring e, as shown in Figure 1.Have several axial plunger holes on the described cylinder body, an above-mentioned plunger is installed in each plunger hole, described each plunger has an axial bore, and an above-mentioned spring is installed in the axial bore of each plunger.Existing its cylinder body form of axial-piston hydraulic motor (or pump) is an overall structure.All on cylinder body, its technology capability is poor, difficulty is big, cost is high for plunger hole (plunger cooperation endoporus) and oil inlet and outlet (oil distributing hole), precision is difficult to guarantee and improve.And existing structure requires also relatively harsher to cylinder block material.CN101050758A discloses a kind of based on gear-driven inclined shaft type sea water plunger pump, belong to the pump class, relate to a kind of end fluid-distributing axial sea water plunger pump, purpose be to eliminate connecting rod and plunger collision, reduce the plunger lateral force, improve the life-span and the stability of sea water plunger pump.The utility model comprises the forward and backward pump housing and rear end cover, connecting rod one end and be positioned before main shaft disk in the pump housing flexibly connect, the other end cooperates with plunger, becomes with main shaft disk on the cylinder body at inclination angle evenly to have plunger hole, plunger wherein is housed, and cylinder body connects rear end cover by the mandrel location and by thrust plate; (1) the front pump body sidewall has water inlet, pump chamber before being communicated with; (2) spiral bevel gear on the main shaft disk and spiral bevel gear gland engagement; (3) will float liner plate and cylinder body of the floating bushing that is loaded on cylinder base flexibly connects; (4) float to be close to thrust plate under the effect of spring push-rod that liner plate is equipped with and holddown spring in cylinder body.CN1087971A discloses a kind of axial plunger type variable capacity pump, is a kind of dynamical element that mechanical energy is changed into the fluid energy.Major character of the present utility model is: at the back side of floating thrust plate, adopted the unsteady plunger of " C " shape; Adopted corrugated spring in the backhaul mechanism, free-standing ball pivot, the surface of contact of backhaul dish and piston shoes are a toroidal surface, and the piston shoes cylinder circumference has buffer ring; Cylinder surface is provided with the screw thread slot type dynamic pressure pump that pump housing inner fluid is pumped into return opening; Plunger is no dead volume structure; Adopted the hydrostatic support structure of intermittent type oiling between variable swash plate and the supporting base; Between swash plate supporting base and front pump cover, be provided with a rubber damper.These technology all do not provide guiding technological scheme to housing structure is simplified.

Summary of the invention

The purpose of this utility model is the deficiency that will overcome above technology, and a kind of axial-piston hydraulic motor or pump are provided, and it can make housing structure be simplified, thereby reduces material and processing cost, improves machining accuracy.

For solving the problems of the technologies described above, the technical solution adopted in the utility model is as follows:

A kind of axial-piston hydraulic motor or pump, has transmission shaft, housing, swash plate, cylinder body, plunger, thrust plate, spring, have several axial plunger holes on the described cylinder body, an above-mentioned plunger is installed in each plunger hole, described each plunger has an axial bore, an above-mentioned spring is installed in the axial bore of each plunger, described each spring has the external part that stretches out from the axial bore of the plunger corresponding with it, the bottom of each plunger hole has oil inlet and outlet, has suction on the thrust plate in order to be connected with described oil inlet and outlet, oil extraction waist shape window, its technological scheme is that it also has the seal that is installed on each plunger hole bottom, be located between cylinder body and the thrust plate and have intermediate hole by above-mentioned transmission shaft pass liner plate, the liner plate and the cylinder body that are pressed on the thrust plate are fixedly connected on one, the external part of described each spring is spacing by the seal of the plunger hole bottom corresponding with it, each seal has a center hole that is communicated with plunger hole, liner plate all has an oily elongated hole of turnover at the center hole opposite position with each seal, turnover on described liner plate oil elongated hole is corresponding one by one respectively with center hole on each seal and be connected, and the oil inlet and outlet of each above-mentioned plunger hole bottom is the center hole of seal of this plunger hole bottom installation and a combination that passes in and out oily elongated hole on the liner plate corresponding with it.

O-ring seals and back-up ring in the toroidal cavity on the outer peripheral surface that in the technique scheme, the described seal that is installed on each plunger hole bottom can have the stuffing box gland that is installed on this plunger hole bottom, be set in stuffing box gland.Above-mentioned liner plate and cylinder body preferably are fixedly connected on one by several pins that pass the attachment hole on liner plate and the cylinder body.The external part of each above-mentioned spring by the spacing concrete structure of the seal of the plunger hole bottom corresponding with it can be, the sealing body has a cylindrical hole in the sidewall center portion of its spacing end, and the external part of spring enters that the described cylindrical hole of sealing body cooperates with it and be spacing by it.Above-mentioned liner plate preferably is ring.

The utlity model has the seal that is installed on each plunger hole bottom, be located between cylinder body and the thrust plate and have intermediate hole by above-mentioned transmission shaft pass liner plate, the liner plate and the cylinder body that are pressed on the thrust plate are fixedly connected on one.It improves original housing structure like this, and middle liner plate and the seal of increasing makes the integral form of cylinder body change combining form into, makes housing structure be able to further simplification, and difficulty of processing reduces, and greatly reduces material and processing cost, has improved machining accuracy.The existence of liner plate had both guaranteed to join the function of oil drag pair, made the range of choice of joining oily auxiliary material more extensive again.Thereby be easy to be extended and applied.Simultaneously seal has guaranteed the sealing between liner plate and the cylinder body and the location of spring.

Description of drawings

Fig. 1 is the structural representation of a kind of axial-piston hydraulic motor (or pump) in the prior art.

Fig. 2 is a structural representation of the present utility model.

Fig. 3 is along the sectional view of A-A line among Fig. 2.

Embodiment

As Fig. 2, shown in Figure 3, the utlity model has transmission shaft 2, housing 10, swash plate 1, cylinder body 4, plunger 3, thrust plate 8, spring 5.The middle part circular hole that transmission shaft 2 passes cylinder body 4 is connected with key or spline with cylinder body.Have several axial plunger holes on the described cylinder body 4, an above-mentioned plunger 3 (being that plunger is placed in along in the uniform plunger hole of cylinder body) is installed in each plunger hole.Described each plunger 3 has an axial bore, an above-mentioned spring 5 is installed in the axial bore of each plunger, and it is spacing by the bottom (the perhaps rotating support device in bottom) of this axial bore from the inserting end that the axial bore of the plunger corresponding with it stretches into for described each spring.Described each spring 5 has the external part that stretches out from the axial bore of the plunger corresponding with it, and the bottom of each plunger hole has oil inlet and outlet (waist shaped hole), has suction, oil extraction waist shape window in order to be connected with described oil inlet and outlet on the thrust plate 8.Structural feature of the present utility model be it also have the seal 6 that is installed on each plunger hole bottom, be located between cylinder body 4 and the thrust plate 8 and have intermediate hole by above-mentioned transmission shaft pass liner plate 7, liner plate 7 is fixedly connected on one with cylinder body 4, thereby guarantees that liner plate rotates with cylinder body.The external part of described each spring is spacing by the seal 6 of the plunger hole bottom corresponding with it, each seal 6 has a center hole that is communicated with plunger hole, liner plate 7 all has an oily elongated hole 71 of turnover at the center hole opposite position with each seal 6, and turnover on the described liner plate 7 oil elongated hole is corresponding one by one respectively with center hole on each seal and be connected.The oil inlet and outlet of each above-mentioned plunger hole bottom is the combination of the center hole and the oily elongated hole 71 of turnover on the liner plate 7 corresponding with it of the seal 6 installed of this plunger hole bottom.The exterior edge face of seal (following in other words stuffing box gland) (closely contact with liner plate and) compresses liner plate, by liner plate location (spacing).Liner plate 7 is pressed on the thrust plate 8 by spring and working medium (by cylinder body and seal).Like this, cylinder body original (being positioned at each plunger hole bottom) oil inlet and outlet becomes the combination of the center hole and the oil of the turnover on the liner plate elongated hole 71 of seal 6 of the present utility model, and suction, the oil extraction waist shape window in order to be connected with described oil inlet and outlet on the thrust plate is 71 corresponding with the oily elongated hole of above-mentioned turnover when work, match and be communicated with.Above-mentioned turnover oil elongated hole 71 also is a waist shaped hole, and the suction on its width and the thrust plate, the width of oil extraction waist shape window are corresponding.

As Fig. 2, shown in Figure 3, O-ring seals (being O shape circle or O shape rubber seal) 62 and back-up ring (support ring) 63 in the toroidal cavity on the outer peripheral surface that the above-mentioned seal that is installed on each plunger hole bottom 6 has the stuffing box gland 61 that is installed on this plunger hole bottom, be set in stuffing box gland.O-ring seals becomes to be set up in parallel with back-up ring, and O-ring seals is in the inboard, and back-up ring is in the outside, and back-up ring is notch-cut type (open type) back-up ring.Back-up ring can be processed by teflon or nylon 1010.Stuffing box gland can be processed by round steel.Certainly, seal can also be other structure.Above-mentioned liner plate 7 is fixedly connected on one with cylinder body 4 by several pins 9 that pass the attachment hole on liner plate and the cylinder body, and liner plate 7 can be ring, and liner plate can be processed by steel plate.The external part of each above-mentioned spring 5 by the seal 6 spacing concrete structures of the plunger hole bottom corresponding with it is, sealing body 6 has a cylindrical hole in the sidewall center portion of its spacing end, the diameter of this cylindrical hole and the external diameter of spring adapt, and the external part of spring enters that the described cylindrical hole of sealing body cooperates with it and be spacing by it.

The perpendicularity of cylinder body of the present utility model and liner plate surface of contact and cylinder inner bore (transmission shaft mounting hole and plunger hole) requires to be preferably 0.002～0.003mm.Liner plate both ends of the surface parallelism requires to be preferably 0.001～0.002mm, and liner plate will have enough hardness, planeness and degree of finish, and wear resistance is good.Liner plate and cylinder body are installed the back coaxality and are required to be preferably 0.002～0.003mm.Stuffing box gland in the seal will meet GB with cooperating of cylinder inner bore, and it and liner plate counterface will have enough hardness, degree of finish and planeness, with the spring fitting surface enough hardness and perpendicularity will be arranged.The utility model is applicable to various axial piston motors and pump, for example utilizes this technology, can produce emulsion motor and rig.

Claims

1, a kind of axial-piston hydraulic motor or pump, has transmission shaft, housing, swash plate, cylinder body, plunger, thrust plate, spring, have several axial plunger holes on the described cylinder body, an above-mentioned plunger is installed in each plunger hole, described each plunger has an axial bore, an above-mentioned spring is installed in the axial bore of each plunger, described each spring has the external part that stretches out from the axial bore of the plunger corresponding with it, the bottom of each plunger hole has oil inlet and outlet, has suction on the thrust plate in order to be connected with described oil inlet and outlet, oil extraction waist shape window, it is characterized in that it also has the seal (6) that is installed on each plunger hole bottom, be located between cylinder body (4) and the thrust plate (8) and have intermediate hole by above-mentioned transmission shaft pass liner plate (7), the liner plate (7) that is pressed on the thrust plate is fixedly connected on one with cylinder body (4), the external part of described each spring is spacing by the seal (6) of the plunger hole bottom corresponding with it, each seal (6) has a center hole that is communicated with plunger hole, liner plate (7) all has a turnover oily elongated hole (71) at the center hole opposite position with each seal (6), turnover on the described liner plate (7) oil elongated hole is corresponding one by one respectively with center hole on each seal and be connected, and the oil inlet and outlet of each above-mentioned plunger hole bottom is the center hole of seal (6) of this plunger hole bottom installation and a combination that passes in and out oily elongated hole (71) on the liner plate (7) corresponding with it.

2, oil hydraulic motor according to claim 1 or pump is characterized in that the above-mentioned seal that is installed on each plunger hole bottom (6) has the stuffing box gland (61) that is installed on this plunger hole bottom, O-ring seals (62) and back-up ring (63) in the toroidal cavity on the outer peripheral surface that is set in stuffing box gland.

3, oil hydraulic motor according to claim 1 or pump is characterized in that above-mentioned liner plate (7) and cylinder body (4) are fixedly connected on one by several pins (9) that pass the attachment hole on liner plate and the cylinder body.

4, oil hydraulic motor according to claim 1 or pump, the external part that it is characterized in that above-mentioned each spring (5) by the spacing concrete structure of seal (6) of the plunger hole bottom corresponding with it is, sealing body (6) has a cylindrical hole in the sidewall center portion of its spacing end, and the external part of spring enters that the described cylindrical hole of sealing body cooperates with it and be spacing by it.

5, oil hydraulic motor according to claim 1 or pump is characterized in that above-mentioned liner plate (7) is ring.