CN101166900A

CN101166900A - Eccentric radial piston pump and eccentric radial piston motor

Info

Publication number: CN101166900A
Application number: CNA2006800112636A
Authority: CN
Inventors: 森野健治; 中川忠; 饭谷英史
Original assignee: Komatsu Ltd
Current assignee: Komatsu Ltd
Priority date: 2005-04-08
Filing date: 2006-03-24
Publication date: 2008-04-23
Also published as: GB0718182D0; KR20070116627A; DE112006000850T5; GB2439235A; SE530925C2; SE0702208L; US20090047146A1; JPWO2006109503A1; WO2006109503A1

Abstract

An eccentric radial piston pump and an eccentric radial piston motor. In the eccentric radial piston pump, a rib (12) projected in the radial direction is formed on the delivery side end part inner peripheral surface of an eccentric cam ring (3) over a prescribed range. In the eccentric radial piston motor, a rib (12) projected in the radial direction is formed on the high-pressure side end part inner peripheral surface of the eccentric cam ring (3) over a prescribed range. The rigidity of the eccentric cam ring (3) is increased by the rib (12) formed in the radial direction to prevent the eccentric cam ring from being deformed by a thrust from a piston. Thus, the rigidity of the eccentric cam ring can be increased without increasing the wall thickness of the eccentric cam ring and the outside dimensions of the eccentric cam ring in the radial direction can be reduced in the eccentric radial piston pump and the eccentric radial piston motor.

Description

Core shift type radial piston pump and core shift type radial piston motor

Technical field

The present invention relates to core shift type radial piston pump and core shift type radial piston motor.

Background technique

In core shift type radial piston pump or core shift type radial piston motor, make the rotating center core shift of the housing of the center of core shift cam ring and radial piston pump or core shift type radial piston motor, by changing this core shift amount, change the path increment of the piston in the cylinder body.By the path increment of change piston, the displacement volume of the pressure oil of piston is changed, the volume controlled of core shift type radial piston pump or core shift type radial piston motor can be become variable.

As the core shift type radial piston pump that used in the past, use patent documentation 1 such structure of putting down in writing.In the core shift type radial piston pump that patent documentation 1 is put down in writing, specific core shift cam ring drives the control piston of usefulness and the configuration relation of pilot valve, has reduced the space of occupying of radial direction.

The core shift type radial piston pump that patent documentation 1 is put down in writing is as example in the past of the present invention, and Figure 13 represents its cross-sectional shape.In each cylinder diameter of cylinder body 40, set piston 41.On each piston 41, engage the rotation connecting rod 42 with piston watt 42a is freely arranged.Piston watt 42a slides along the inner peripheral surface of the core shift cam ring 43 of the outer circumferential side that is provided in cylinder body 40.

Be equipped with pivot 44 at the center of cylinder body 40, but the center core shift of the center of pivot 44 and core shift cam ring 43 sets with suction port and exhaust port.Core shift cam ring 43 can carry out core shift and moves while keeping central axis parastate with cylinder body 40.

The core shift amount of core shift cam ring 43 is by control piston 46,47 controls.Each end of control piston 46,47 and core shift cam ring 43 butts, the application of force of utilizing spring 48,49 pushes from both sides core shift cam ring 43.Utilization acts on the pressure oil of control piston 46, can make the central shaft core shift of core shift cam ring 43 relative pistons 44.

Supply to the pressure oil of control piston 46, by pilot valve 50 controls to the circumferencial direction tilted configuration of housing 45.

Patent documentation 1: TOHKEMY 2004-68796 communique

In core shift type radial piston pump and core shift type radial piston motor, the core shift amount of the rotating center of the housing in the center of core shift cam ring and radial piston pump or the core shift type radial piston motor is by the amount of movement control of core shift cam ring.In addition, the thrust of piston generation is by the inner peripheral surface supporting of core shift cam ring.Therefore, be bearing on the lower surface of core shift cam ring from the integral body of the thrust of piston form with the supporting concentrated load.

Therefore, in the lower occasion of the rigidity of core shift cam ring, for example in the thin occasion of the wall thickness of core shift cam ring, the core shift cam ring is deformed into leg-of-mutton prismatic roundness shape because of the thrust of piston.That is, as shown in figure 14, become the thrust (among Figure 15 shown in the arrow) of the piston of high pressure in being subjected to from cylinder diameter for circular core shift cam ring under no load condition, the core shift cam ring is subjected to distortional stress internally and is out of shape thus.Like this, the core shift cam ring is circular under no load condition shown in Figure 14, but is subjected to distortional stress and is deformed into leg-of-mutton prismatic roundness shape shown in Figure 15.

Produce the occasion of distortion at the core shift cam ring, generation gap between the core shift cam ring inner peripheral surface after the barrel surface of the piston that slides along core shift cam ring inner peripheral surface watt and the distortion and do not carry out contacting of same surface state.Because of this gap, just inhomogeneous with respect to the contact of the piston of core shift cam ring inner peripheral surface watt.

For example, when the piston watt inner peripheral surface along the core shift cam ring slides, if the external diameter of barrel surface of coming piston watt is greater than the place of the internal diameter of core shift cam ring, then only the two circumferential ora terminalis sides and the internal diameter sliding contact of core shift cam ring of piston watt are subjected to bigger face pressure in described two ora terminalis sides.Press because of the bigger face of the two circumferential ora terminalis sides that are applied to piston watt and to make the piston stress that watt bends.In addition, if come the external diameter place littler than the internal diameter of core shift cam ring of the barrel surface of piston watt, then the contact of piston watt diminishes, easily come-up.

For patent documentation 1, as shown in figure 13, in core shift type radial piston pump and core shift type radial piston motor in the past, do the wall thickness of core shift cam ring thicker, prevent the distortion of core shift cam ring.

But if do the wall thickness of core shift cam ring thicker, the boundary dimension that then produces the radial direction in core shift type radial piston pump or the core shift type radial piston motor becomes big problem.Especially in core shift type radial piston pump and core shift type radial piston motor, requirement is done the boundary dimension of radial direction little as far as possible, and the boundary dimension that therefore increases radial direction is run counter to above-mentioned requirements.

Summary of the invention

For solving above-mentioned problem in the past, the invention provides a kind of core shift type radial piston pump and core shift type radial piston motor, even the wall thickness of core shift cam ring is not done the thick rigidity that also can improve the core shift cam ring, and can do the boundary dimension of radial direction little.

Purpose of the present invention can utilize claim 1～10 described each invention to realize.

That is, the core shift type radial piston pump of the 1st invention changes the displacement volume of pressing oil according to the core shift amount of core shift cam ring, and main being characterised in that in the predetermined range of the end inner peripheral surface of the discharge side of core shift cam ring, is provided with to the outstanding rib of direction radially.

The major character of the 2nd invention is, limits the shape of rib.

The major character of the 3rd invention is, the relation of the wall thickness of qualification core shift cam ring and the wall thickness of rib.

Also have, the major character of the 4th invention and the 5th invention is, limits the structure of the side end face of rib.

The core shift type radial piston motor of the 6th invention, core shift amount according to the core shift cam ring changes the displacement volume of pressing oil, its main being characterised in that in the predetermined range of the on high-tension side end of core shift cam ring inner peripheral surface, is provided with to the outstanding rib of direction radially.

The major character of the 7th invention is, limits the shape of rib.

The major character of the 8th invention is, the relation of the wall thickness of qualification core shift cam ring and the wall thickness of rib.

Also have, the major character of the 9th invention and the 10th invention is, limits the structure of the side end face of rib.

In the present invention, in core shift type radial piston pump and core shift type radial piston motor, the wall thickness of core shift cam ring is not done thickly, and formed the rib of radial direction, thereby can improve the rigidity of core shift cam ring at the inner peripheral surface of core shift cam ring.

In core shift type radial piston pump, on the end inner peripheral surface of the discharge side by rib being formed on the core shift cam ring, and in core shift type radial piston motor, on the on high-tension side end inner peripheral surface that rib is formed on the core shift cam ring, thereby can prevent to make the distortion of core shift cam ring because of the thrust of piston.

In the present invention, also can be at Zhou Peishe rib in the end of core shift cam ring inner peripheral surface whole.By Zhou Peishe rib in end inner peripheral surface whole, can prevent the distortion of core shift cam ring more firmly.

Description of drawings

Fig. 1 is the roughly longitudinal section (embodiment 1) of core shift type radial piston pump.

Fig. 2 is the longitudinal section (embodiment 1) of core shift cam ring.

Fig. 3 is the longitudinal section (embodiment 1) of another core shift cam ring.

Fig. 4 is the longitudinal section (embodiment 1) of another core shift cam ring.

Fig. 5 is the stereogram (embodiment 1) of core shift cam ring.

Fig. 6 is another stereogram (embodiment 1) of core shift cam ring.

Fig. 7 is the another stereogram (embodiment 1) of core shift cam ring.

Fig. 8 is the illustraton of model (embodiment 1) that the rigidity of core shift cam ring is resolved.

Fig. 9 is the diagrammatic sketch (embodiment 1) of the stress distribution of expression analytical model.

Figure 10 is the table (embodiment 1) of expression analysis result.

Figure 11 is the roughly longitudinal section (embodiment 2) of core shift type radial piston pump.

Figure 12 is the roughly longitudinal section (embodiment 3) of core shift type radial piston motor.

Figure 13 is the roughly longitudinal section (example in the past) of core shift type radial piston pump.

Figure 14 is the shape figure (illustrative examples) of the core shift cam ring under the no load condition.

Figure 15 is the deformation pattern (illustrative examples) of core shift cam ring when having applied load.

Symbol description

The 1st, core shift type radial piston pump, the 3rd, core shift cam ring, the 4th, cylinder body, the 5th, piston, the 8th, pivot, the 10th, suction port, the 11st, exhaust port, the 12nd, rib, 15a, 15b are pistons, the 22, the 23rd, and actuating mechanism, 25a, 25b are pistons, 28a, 28b are the pushing members, 30, the 31st, fastened component, the 32nd, core shift type radial piston motor, the 33rd, pivot, the 34, the 35th, gateway, the 40th, cylinder body, the 41st, piston, the 43rd, core shift cam ring, the 44th, pivot, the 46, the 47th, control piston, the 50th, pilot valve

Embodiment

For preferred embodiment of the present invention, carry out following specifying with reference to the accompanying drawings.The structure of core shift type radial piston pump of the present invention and core shift type radial piston motor except that the shape of following explanation, configuration structure, if be shape, the configuration structure that can realize the object of the invention also, then can adopt these shapes and configuration structure.Therefore, the invention is not restricted to the embodiment of following explanation, can make numerous variations.

In addition, core shift type radial piston pump of the present invention or core shift type radial piston motor also comprise core shift type radial piston pump, the motor that can use pumping action and motor effect in the lump.

Embodiment 1

Fig. 1 represents the roughly longitudinal section of the core shift type radial piston pump 1 of embodiments of the invention.Fig. 2 represents the longitudinal section of core shift cam ring 3.As shown in Figure 1, in housing 2, set core shift cam ring 3, set rotatable cylinder body 4 in the inboard of core shift cam ring 3.In cylinder body 4, radially form a plurality of cylinder diameters 7, in each cylinder diameter 7, set slip piston 5 freely.

At piston 5 upper supports swing piston freely watts 6 is arranged.The camming surface 3A sliding contact of piston watts 6 and core shift cam ring 3 is slided on camming surface 3A along with the rotation of cylinder body 4.By the slip of piston watts 6 on camming surface 3A, piston 5 is moved back and forth.

The pivot 8 that sets on the housing 2 is embedded in the pivot insertion part 9 of cylinder body 4, and cylinder body 4 is supported in rotation freely.On pivot 8, form suction port 10 and exhaust port 11.By the rotation of cylinder body 4, piston 5 carries out inhalation process repeatedly and discharges operation.

In inhalation process, piston 5 to sliding from cylinder diameter 7 outstanding directions, will press oil to be attracted in the cylinder diameter 7 from suction port 10 to lower dead centre from upper dead center.In discharging operation, piston 5 slides to upper dead center from lower dead centre, and the pressure oil pressure in the cylinder diameter 7 are contracted.The compressed pressure oil that becomes high pressure is discharged from exhaust port 11.

As shown in Figure 2, the inner peripheral surface of core shift cam ring 3 forms the rib 12 of ring-type.The cyclic rib 12 that forms on the inner peripheral surface of core shift cam ring 3 is represented to extend the shape that is provided with from camming surface 3A to the central side of core shift cam ring 3 in Fig. 1.

About housing 2,

form cylinder chamber

14a, 14b, in each

cylinder chamber

14a, 14b, set respectively slidably, with piston 15a, the 15b of core shift cam ring 3 outer circumferential face butts.Each

piston

15a, 15b are respectively by spring 16a, the 16b application of force, and the front end of each

piston

15a, 15b pushes the outer circumferential face of core shift cam ring 3 all the time and becomes the butt state.

By the handover operation of switching valve 18, Pressure oil feeder to a cylinder chamber 14a or the cylinder chamber 14b from oil pressure pump 19 can be discharged to fuel tank 20 with the pressure oil in another cylinder chamber 14b or the cylinder chamber 14a.

In addition, the outer circumferential face of core shift cam ring 3 and guide surface 13 sliding contacts that are formed on the position up and down of housing 2.Switch motion according to switching valve 18 makes

piston

15a, 15b action, and core shift cam ring 3 is moved along guide surface 13, thereby can adjust the core shift amount with respect to the rotating center of cylinder body 4.

As shown in Figure 2, on the inner peripheral surface of the end of core shift cam ring 3, form rib 12, utilize rib 12 to improve the rigidity of core shift cam rings 3 to the inboard ring-type of direction radially.

By forming rib 12, the rigidity that can improve core shift cam ring 3 prevents its distortion, thereby can remain definite shape as the camming surface 3A of core shift cam ring 3.Thus, can keep the sliding contact state of piston watts 6 and camming surface 3A all the time well, can prevent that piston watts 6 from floating from camming surface 3A.

As rib 12, constitute one with core shift cam ring 3, also can separate formation with core shift cam ring 3.When separately constituting rib 12, rib 12 is utilized on the chimeric inner peripheral surface that is fixed on core shift cam ring 3 such as method of press-fitting, also fixing means such as available welding is fixed on rib 12 on the core shift cam ring 3.

As the overhang of the radial direction of rib 12, must be to have the overhang of rigidity that can prevent to make the degree of core shift cam ring distortion because of thrust from piston 5.In addition, also can adjust the overhang of radial direction by the relation of the material of rib 12 and wall thickness.

As the rib on the two end part that are configured in core shift cam ring 3 respectively 12, as shown in Figure 3, a rib and core shift cam ring 3 are constituted one, another rib 12 and core shift cam ring 3 are separated formation.Separately the rib 12 that constitutes makes the structure that has to the side-prominent lip part of the inner peripheral surface of core shift cam ring 3 as shown in Figure 3, and as shown in Figure 4, also can make the structure that has respectively to the side-prominent lip part of the inner peripheral surface side of core shift cam ring 3 and outer circumferential face.Separately the rib 12 that constitutes can utilize the fixation method of the chimeric fixation method that is pressed into etc., welding etc. and be fixed on the core shift cam ring 3.

As the structure of rib 12, except the rib shape of ring-type, also can make the represented such shape of the stereogram of using core shift cam ring 3 among Fig. 5～Fig. 7 respectively.The shape of the rib of representing among Fig. 5～Fig. 7 12 is illustrations, and the present invention is not limited to above-mentioned shape.So long as can improve the rib shape of the rigidity of core shift cam ring 3, and can be with these shapes as rib of the present invention, in addition, the rib shape of this moment is in the present invention involved.

As shown in Figure 5, can on the part of the end of core shift cam ring 3 inner peripheral surface, set rib 12 in advance.In this occasion, this rib 12 can be pre-configured in and be subjected to bigger position from the thrust that is provided in the piston 5 in the cylinder body 4.That is, can in advance rib 12 be configured on the end inner peripheral surface of discharge side of core shift cam ring 3.

Structure as described rib 12 being configured in the end inner peripheral surface comprises following two structures: rib 12 is configured in the structure in the inner peripheral surface of core shift cam ring 3; The structure that the end face of the side of rib 12 and core shift cam ring 3 is close to.

As shown in Figure 6, also can be provided in the position that the thrust from piston 5 acts on significantly respectively is the two end part of core shift cam ring 3.In addition, as shown in Figure 7, also rib 12 can be provided in respectively on the end inner peripheral surface of scene 2 inlet side of core shift cam ring.

Like this, can be in the zone of the end inner peripheral surface of the core shift cam ring 3 that is subjected to moderate finite deformation load formation rib 12.By making structure like this, utilize the rib 12 that is provided in the necessary minimal scope just can effectively prevent the distortion of core shift cam ring.

From the above, both can be formed on as the rib 12 on the end inner peripheral surface that is provided in core shift cam ring 3 on full week of end inner peripheral surface of core shift cam ring 3, also can be formed on pressure oil in the cylinder diameter 7 becomes high pressure, becomes from the thrust of piston 5 in the zone of end inner peripheral surface of core shift cam ring 3 of bigger distortion load.

Occasion on the part of the end inner peripheral surface that rib 12 is provided in core shift cam ring 3, at the position that is equipped with rib 12 with do not set the border at the position of rib 12, i.e. border between the end face of rib 12 and core shift cam ring 3, the shape that must constitute rib 12 is not to be subjected to concentrated load.

Occasion on the two end part inner peripheral surface that rib 12 is provided in core shift cam ring 3 respectively, separate formation with being configured in a distolateral rib 12 at least with segmented shape and core shift cam ring 3, perhaps also can be as shown in Figure 6, the overhang that is provided in the radial direction of a distolateral rib 12 is constituted lower than the overhang of the radial direction of the rib 12 that is provided in the other end side.

By making structure like this, when assembling core shift type radial piston pump 1, piston inserted assembling in cylinder body after, can pack into successively is divided into a plurality of separately fins of formation.

Perhaps constitute, the periphery of the piston watts 6 when piston 5 is inserted into upper dead center position is respectively directly become the overhang of the radial direction of rib 12 can be inserted into by doing directly than the periphery of the formed opening of inner peripheral surface of the upper end of the rib 12 of downside and core shift cam ring 3.

Thus, can set rib, can easily carry out piston 5 is installed in assembling work on the cylinder body 4 that is equipped in the core shift cam ring 3 at the two ends of core shift cam ring.

The wall thickness of rib 12 preferably make with the wall thickness of core shift cam ring 3 about equally.Fig. 8 is the wall thickness t1 of expression core shift cam ring 3 and the parsing illustraton of model of the wall thickness t2 relation of rib 12, represents the cross-sectional shape of the periphery of core shift cam ring 3.

Using core shift cam ring 3 shown in Figure 8, internal diameter, flange internal diameter and the cam width of core shift cam ring 3 are made under the condition of fixed dimension, making is carried out the parsing of finite element method with the wall thickness t1 of core shift cam ring 3 and each model of the core shift cam ring 3 of the ratio change of the wall thickness t2 of rib 12 according to the cam stress of each model.In addition, when resolving with finite element method, the ratio of wall thickness t1 and wall thickness t2 is that the quality at core shift cam ring 3 makes under roughly certain condition and changes.

The stress distribution of carrying out the cam stress that computing obtains with finite element method is a stress distribution shown in Figure 9.Fig. 9 is a core shift cam ring 3 with the butt position with the guide surface 13 of housing 2 is the stereogram of the major component at center.Learn from Fig. 9,, maximum stress σ takes place at the position of the core shift cam ring 3 of discharging side with guide surface 13 butts of housing 2 ₁In addition, as can be known, along with the position of leaving with guide surface 13 butts, stress is from σ ₂Be reduced to σ ₃, σ ₄

In addition, learn, for maximum stress σ takes place at least from Fig. 9 ₁The position or the stress bigger than required stress (σ for example takes place ₃Above stress) position also forms rib in addition by the end at core shift cam ring 3, and can suppress the stress that takes place less.That is, Fig. 9 is illustrated in the example of the one-sided formation rib 12 of core shift cam ring 3, but for example as shown in Figure 6, forms rib 12 by the two end part at core shift cam ring 3, can make core shift cam ring 3 and more be difficult to deformed configurations.

The table of the analysis result of the cam stress of Fig. 9 described each model that to be expression try to achieve with finite element method according to above-mentioned condition.Learn that from Fig. 9 when the ratio with the wall thickness t1 of core shift cam ring 3 and the wall thickness t2 of rib 12 made 1: 1, cam stress was minimum.And the maximum cam stress that take place this moment can be controlled in the admissible scope.In addition, when the ratio with wall thickness t1 and wall thickness t2 makes 1: 1, the profile of core shift cam ring 3 can be constituted minimum dimension.

Thus, by wall thickness t1 was made 1: 1 with the ratio of wall thickness t2, thereby can be configured the size of the radial direction of core shift type radial piston pump 1 less.And, the rigidity of core shift cam ring 3 can be made enough rigidity that can prevent 3 distortion of core shift cam ring.

So, by the wall thickness t1 of core shift cam ring 3 and the wall thickness t2 of rib 12 are made roughly the same wall thickness, have the core shift cam ring 3 that can prevent thereby can constitute, and can constitute the size shape that makes core shift cam ring 3 and be minimum size shape from the rigidity of the caused distortion of thrust of piston.

In addition, the sliding stability of piston watts 6 can be obtained, the stabilized driving of core shift type radial piston pump 1 can be carried out.In addition, the wall thickness t1 of core shift cam ring 3 is not done thickly, can improve the rigidity of core shift cam ring 3 yet.Thus, can do the boundary dimension of the radial direction of core shift type radial piston pump 1 less, and can improve volumetric efficiency.

In addition, even actuating mechanism of core shift cam ring 3 etc. is provided in the core shift type radial piston pump 1, also can reduce the boundary dimension of the radial direction of core shift type radial piston pump 1.

When the actuating mechanism that will give the core shift amount to core shift cam ring 3 etc. was provided in the axial outside of core shift cam ring 3, the axial length of core shift type radial piston pump 1 was elongated.Yet can reduce the boundary dimension of the radial direction of core shift type radial piston pump 1, therefore, the result can be configured longitudinal and transverse, the high overall dimensions that constitutes by core shift type radial piston pump 1 less.

And, the boundary dimension of the radial direction by reducing core shift type radial piston pump 1, thus can reduce to carry the space (Japanese: field boundary Plot), also can carry effectively on small-sized oil pressure machinery etc. of core shift type radial piston pump 1.

Embodiment 2

Figure 11 represents other the roughly longitudinal section of core shift type radial piston pump 1 of embodiments of the invention.As the structure that makes core shift cam ring 3 core shifts, in embodiment 1, by be located at housing 2 about on piston 15a, the action of 15b, make core shift cam ring 3 core shifts.

On the contrary, in embodiment 2, form fastened

component

30,31, act on the fastened

component

30,31 by making the

actuating mechanism

22,23 of giving the core shift amount, and make core shift cam ring 3 core shifts in the side that is provided in the rib 12 on the core shift cam ring 3.

In this structure, embodiment 2 structure is different from embodiment's 1 structure.Other structure is identical with embodiment 1.Therefore,, put on identical member symbol, and omit explanation for the structure identical with embodiment 1.

Be formed on that fastened

component

30,31 on rib 12 sides both can be used as the member that engages with hole 12a shown in Figure 2 and the side that is provided in rib 12 also can form as one with rib 12.Actuating mechanism 22 has: accept from the pressure oil of oil pressure pump 19 and pair of

pistons

25a, 25b that fastened component 30 is pushed; Spring 26a, 26b that pair of

pistons

25a, 25b are pressed to fastened component 30 thrusters respectively.Actuating mechanism 23 has: a pair of pushing member 28a, the 28b that push from the two ends of fastened component 31; A pair of pushing

member

28a, 28b are applied spring 29a, the 29b of pushing force.

The pair of pistons 25a of

actuating mechanism

22,25b and spring 26a, 26b are provided in respectively in cylinder chamber 24a, the 24b.By the switching of switching valve 18, will be from the Pressure oil feeder of oil pressure pump 19 to cylinder chamber 24b, when the pressure oil in the 24a of cylinder chamber was discharged to fuel tank 20, the left of piston 25b in Figure 11 slided, and the core shift cam ring 3 also left in Figure 11 moves.In addition, when switching valve 18 from this switching position when the switching position of opposition side is switched, can make right-hand move of core shift cam ring 3 in Figure 11.

A pair of pushing member 28a, the 28b of actuating mechanism 23 is subjected to being provided in the application of force to direction near each other of

spring

29a, 29b in the 27a of spring housing, the 27b respectively.Utilize a pair of pushing

member

28a, 28b and obtain the rotation stopping function of core shift cam ring 3.

When core shift cam ring 3 utilize actuating mechanism 22 pair of

pistons

25a, 25b action and when mobile,

spring

29a, 29b are out of shape respectively and can make core shift cam ring 3 parallel moving.

The equipping position of allocation position that sets cylinder chamber 24b and the 27a of spring housing be can turn around, actuating mechanism 22 and actuating mechanism 23 constituted with pushing member 28a.At this moment, comprise that as actuating mechanism 22 cylinder chamber 24a with piston 25a and the 27a of spring housing with the pushing member 28a that replaces cylinder chamber 24b and set, actuating mechanism 23 comprise the cylinder chamber 24b with the piston 25b that replaces the 27a of spring housing and set and have the 27b of spring housing that pushes member 28b.

Equally, also can turn the equipping position of allocation position that sets cylinder chamber 24b and the 27b of spring housing around, constitute actuating mechanism 22 and actuating mechanism 23 with pushing member 28b.

If make this structure, by will supplying to cylinder chamber 24a and cylinder chamber 24b selectively from the pressure oil of switching valve 18 outputs, thus the moving of may command core shift cam ring 3.

In addition, as embodiment 2 structure, also can the both sides of each fastened

component

30,31 will be provided in respectively with the pair of pistons of the both sides butt of fastened

component

30,31 shown in Figure 11 respectively.

As shown in figure 11, as the position that sets of

actuating mechanism

22,23, owing to can be provided in the axial outside of core shift cam ring 3 and the internal side diameter of core shift cam ring 3, so can be configured the profile of the radial direction of core shift type radial piston pump 1 less.

In this occasion, because the

actuating mechanism

22,23 of giving core shift amount 3 to the core shift cam ring is provided in the axial outside of core shift cam ring 3, so the axial length of core shift type radial piston pump 1 is elongated.

But owing to can reduce the boundary dimension of the radial direction of core shift type radial piston pump 1, therefore, the result can will do lessly by the overall dimensions longitudinal and transverse, that height constitutes of core shift type radial piston pump 1.

Also hole 12a shown in Figure 2 can be used as the spline member that the spline of core shift cam ring 3 is used, replace being used as the hole that the fastened

component

30,31 that engages with

actuating mechanism

22,23 is installed.In addition, also spline member and core shift cam ring can be constituted one, replace forming hole 12a in the side of rib 12.

Embodiment 3

Figure 12 represents the roughly longitudinal section of the core shift type radial piston motor 32 of embodiments of the invention.In embodiment 3, except the structure this point of expression core shift type radial piston motor 32, other structure is identical with the structure of core shift type radial piston pump 1 among the embodiment 1.Therefore, for the identical structure of structure of core shift type radial piston pump 1, with the employed member symbol of Fig. 1, and omit explanation.

In core shift type radial piston motor 32, cylinder body 4 is structures of one rotation with pivot 33.Therefore, the path that is formed on the pressure oil on the pivot 33 that is communicated with

gateway

34,35 respectively forms the path of same diameter respectively.

By the way, in core shift type radial piston pump 1, cylinder body 4 be rotated and pivot 8 for non-rotating.Therefore, be formed on the path of the pressure oil on the pivot 33, its passage diameters that is communicated with suction port 10 is configured bigger than the passage diameters that is communicated with exhaust port 11.

In core shift type radial piston pump 1, also the passage diameters with suction port 10 connections can be made the identical diameter of passage diameters that is communicated with exhaust port 11.Especially, in core shift type radial piston pump, motor, the passage diameters that is communicated with suction port 10 must make the identical diameter of passage diameters that is communicated with exhaust port 11.

In addition, in Fig. 1, represented with suction port 10 be configured in figure downside, exhaust port 11 is configured in the configuration example of the upside of figure, but also can constitute the allocation position of suction port 10 and exhaust port 11 on the contrary with Fig. 1.

In core shift type radial piston motor 32 shown in Figure 12, the gateway 34 that for example is positioned at downside in Figure 12 is communicated with on high-tension side oil pressure, and the gateway 35 that is positioned at upside is communicated with the oil pressure of low voltage side.By the rotation of cylinder body 4 and pivot 33, when downside was come in the gateway 35 that is communicated with low voltage side at upside, then this was communicated with on high-tension side oil pressure.

Simultaneously, in gateway that downside once was communicated with the high pressure side 34 be communicated with the oil pressure of low voltage side.That is,

gateway

34,35 alternately is communicated with the pressure oil of on high-tension side pressure oil and low voltage side along with the rotation of cylinder body 4 and pivot 33 respectively.

The pressure oil of high pressure supplies in the cylinder diameter 7 from gateway 34 or the gateway 35 that is communicated with on high-tension side oil pressure.Utilization is fed into the pressure oil of the high pressure in the cylinder diameter 7, and the piston 5 in the pushing cylinder diameter 7 makes cylinder body 4 rotations.

Identical with the explanation of among the embodiment 1 occasion of core shift type radial piston pump 1 being done, as the structure of rib 12, can constitute to radially direction is outstanding in the predetermined range of the on high-tension side end inner peripheral surface of core shift cam ring 3 at least.By constituting rib 12, can improve the rigidity of core shift cam ring 3 so that core shift cam ring 3 is indeformable.

As the structure of rib 12, can form and structure that Fig. 2～structure shown in Figure 7 is identical.In addition, as described in embodiment 1 the explanation, if can improve the rib shape of the rigidity of core shift cam ring 3, can be with these shapes as rib of the present invention.

By rib 12 is set, can obtain to be used for the embodiment's 1 of core shift type radial piston pump 1 the identical effect of situation with the core shift cam ring 3 that will have rib 12 on core shift cam ring 3.In addition, the parsing that describes with Fig. 8～Figure 10 is with the result of model, and is still applicable in the occasion of core shift type radial piston motor 32.

As the structure of core shift type radial piston motor 32, except structure shown in Figure 12, also can make the structure identical with core shift type radial piston pump shown in Figure 11 1.At this moment, the passage diameters that preferably will be formed on respectively on the pivot that is communicated with suction port 10 and exhaust port 11 constitutes identical passage diameters.

In addition, with among the embodiment 2 explanation identical, in the side that is provided in the rib 12 on the core shift cam ring 3, the spline fastened component of spline when making core shift cam ring core shift or the fastened component that engages with the actuating mechanism of the core shift cam ring being given the core shift amount can be set also.

In the above-described embodiments, the structure of core shift type radial piston pump 1 and the structure of core shift type radial piston motor 32 are described, as the structure of core shift type radial piston pump illustrated among the embodiment or core shift type radial piston motor, also comprise the structure of core shift type radial piston pump, motor.

Utilize possibility on the industry

The present invention can be applied to technological thought of the present invention the device that can use the technology of the present invention thought etc.

Claims

1. core shift type radial piston pump changes the displacement volume of pressing oil according to the core shift amount of core shift cam ring, it is characterized in that,

In the predetermined range of the end inner peripheral surface of the discharge side of core shift cam ring, be provided with to the outstanding rib of direction radially.

2. core shift type radial piston pump as claimed in claim 1 is characterized in that, described rib was provided on the complete interior week of described end inner peripheral surface.

3. core shift type radial piston pump as claimed in claim 1 or 2 is characterized in that the wall thickness of described core shift cam ring and the wall thickness of described rib are roughly the same wall thickness.

4. core shift type radial piston pump as claimed in claim 1 or 2, it is characterized in that, at the outer side surface of the described rib parallel, be provided with the spline fastened component of spline when making described core shift cam ring core shift and/or the fastened component that engages with the actuating mechanism of giving the core shift amount to described core shift cam ring with the core shift direction of described core shift cam ring.

5. core shift type radial piston pump as claimed in claim 3, it is characterized in that, at the outer side surface of the described rib parallel, be provided with the spline fastened component of spline when making described core shift cam ring core shift and/or the fastened component that engages with the actuating mechanism of giving the core shift amount to described core shift cam ring with the core shift direction of described core shift cam ring.

6. core shift type radial piston motor changes the displacement volume of pressing oil according to the core shift amount of core shift cam ring, it is characterized in that,

In the predetermined range of the on high-tension side end of core shift cam ring inner peripheral surface, be provided with to the outstanding rib of direction radially.

7. core shift type radial piston motor as claimed in claim 6 is characterized in that, described rib was provided on the complete interior week of described end inner peripheral surface.

8. as claim 6 or 7 described core shift type radial piston motor, it is characterized in that the wall thickness of described core shift cam ring and the wall thickness of described rib are roughly the same wall thickness.

9. as claim 6 or 7 described core shift type radial piston motor, it is characterized in that, at the outer side surface of the described rib parallel, be provided with the spline fastened component of spline when making described core shift cam ring core shift and/or the fastened component that engages with the actuating mechanism of giving the core shift amount to described core shift cam ring with the core shift direction of described core shift cam ring.

10. core shift type radial piston motor as claimed in claim 8, it is characterized in that, at the outer side surface of the described rib parallel, be provided with the spline fastened component of spline when making described core shift cam ring core shift and/or the fastened component that engages with the actuating mechanism of giving the core shift amount to described core shift cam ring with the core shift direction of described core shift cam ring.