CN202579146U - Distributing shaft and manual hydraulic pump provided with same - Google Patents

Abstract

The utility model discloses a distributing shaft and a manual hydraulic pump provided with the same. The technical scheme is as follows: the distributing shaft used for the hydraulic pump comprises a shaft body, a pressure accumulation cavity, and a hole cavity A, a hole cavity B, a hole cavity C which are communicated with the pressure accumulation cavity respectively, wherein by taking the radial section of the shaft body as reference, the hole cavity A, the hole cavity B, and the hole cavity C are arranged in different sections respectively; the angles of the hole cavity A and the hole cavity B are different; the circumferential surface of the shaft body is provided with an oil groove; at least part of the oil groove and the hole cavity A are positioned on the same section, and at least another part of the oil groove and the hole cavity B are positioned on the same section; and by taking the rotation direction of the distributing shaft from the rising position to the lowering position as reference, the oil groove is arranged on the circumferential surface between the hole cavity B and the hole cavity A. The distributing shaft adopts the rigid-flexible sealing mode, the seal cartridge is hard to be scratched by the orifice, so that the sealing property is good and the durability is high.

Description

A kind of distribution shaft and install the hydraulic hand-pump of this distribution shaft

Technical field

The utility model relates to a kind of hydraulic overturn lowering or hoisting gear that is used for lifting automobile cab or similar device, is the hydraulic hand-pump that is used to provide power in the hydraulic overturn lowering or hoisting gear specifically, particularly relates to the distribution shaft of this oil hydraulic pump.

Background technique

Known; If automobile cab need overturn than wide-angle, particularly climb under the situation of center of gravity, operator cabin can not rely on deadweight to descend; Need a kind of two circuit hydraulic overturn lowering or hoisting gear, utilize oil hydraulic cylinder rod member retraction to drive operator cabin and climb over center of gravity realization decline.

In the existing technology, for this double loop hydraulic turning lifting device provides the hydraulic hand-pump of power to comprise fuel tank, the pump housing; (distribution shaft is in engineering practice here, and those skilled in the art are also referred to as selector valve, distributing valve, reversing shaft etc., and its essence is identical to be integrated in plunger, distribution shaft in the pump housing; Only be that title changes; As follows) etc., the sealing between its middle pump body and the distribution axis hole system is a key point, adopts rigid seal or flexible sealing usually.Rigid seal requires very high to the quality of fit between the pump housing and the distribution shaft, not only the component processing and assembling is with high costs, is difficult to reach quality requirement, and the relative wear in the middle of using is difficult to repair, and lets out in easily; The good sealing effect of flexible sealing, but use the short period oil hydraulic pump will decompression or leakage of oil, durability is bad.

The inventor has anatomized the defect cause of existing technology.As shown in Figure 1 is the axial sectional structure schematic representation of distribution shaft of existing technology, and the distribution shaft axis body has filler opening 101, last return opening 102 and following return opening 103 and is communicated with pressure accumulation chamber 11 respectively; Have an annular groove 104 along distribution shaft axis body circumference; Aforesaid distribution axis hole is all to be arranged among the annular groove 104; Said filler opening 101, go up return opening 102 and all offer into step hole with following return opening 103, the stuffing box gland 15 of installing one hollow and exterior edge face camber in the macropore is propped up by O-ring seals 16 bottom it; Distributing axis hole system and sealing between the pump housing is to rely on tight between stuffing box gland and the pump housing wall to contact realization; Because the existence of annular groove 104 and O-ring seals 16 are in the supporting effect of bottom; Stuffing box gland 15 must be given prominence to an aperture part, is conducting or when separating, the seamed edge or the orifice of pump housing hole system must scratch stuffing box gland 15 when distribution shaft rotation makes its hole system and pump housing hole; Stuffing box gland 15 adopts nonmetallic engineering plastics to be made usually; Be easy to damage stuffing box gland 15, as long as and distribute and to have a stuffing box gland impaired in the axis hole system, will cause oil hydraulic pump decompression or leakage of oil; The hydraulic hand-pump of existing technology that Here it is is short service time, the main reason that durability is bad; Secondly this distribution shaft is not because the existence of annular groove 104 even if between the distribution shaft and the pump housing be accurate Spielpassung, has rigid seal between the distribution axis hole system and the pump housing yet; Its sealing must rely on stuffing box gland fully; Sealing means is single, so arbitrary stuffing box gland 15 is impaired, whole oil hydraulic pump had just lost efficacy; This also is that hydraulic hand-pump is short service time, the secondary cause that durability is bad.

Because it is to adopt differential circuit that the oil hydraulic cylinder of this double loop turning lifting device rises; For guaranteeing safety; One fluid-control one-way control valve unit when decompression (be used for that oil hydraulic cylinder is in lifting position and stop oil hydraulic cylinder to descend) is arranged between cavity of resorption oil nozzle 35 and oil hydraulic cylinder cavity of resorption; Have only distribution shaft switching-over back to oil hydraulic cylinder epicoele (rod chamber) people for after suppressing setup pressure value, Pilot operated check valve just can be opened.So before oil hydraulic cylinder cavity of resorption and the conducting of decline return line; Must be the pressure releasing in the cavity of resorption pipeline beyond oil hydraulic cylinder epicoele and the fluid-control one-way control valve unit; Thereby make the fluid-control one-way control valve unit be in closed condition, otherwise the pressure that exists in the pipeline can back down the automatic conducting decline of fluid-control one-way control valve unit loop after the distribution shaft switching-over; Cause the decline of upender moment impact property, jeopardize safety.The pressure release design of existing technology is to open an annular groove 104 along distribution shaft valve body circumference, distributes axis hole system all to be arranged among the annular groove 104, and pump housing hole system is also corresponding within annular groove 104 scopes; Annular groove 104 cooperated formation one annular drainback passage when distribution shaft was assembled into one with the pump housing with the pump wall; When distribution shaft is turned in the lowering position process by lifting position; Distribution axis hole system and pump housing hole system separate and contact with pump housing wall; Be communicated with the E hole section 33, D hole section 32 of oil hydraulic cylinder upper and lower cavity this moment through annular drainback passage and 31 conductings of pump housing return opening, moment realization pressure release turns to lowering position at distribution shaft and makes the fluid-control one-way control valve unit be in closed condition before.

Summary of the invention

Through analyzing, the design deficiency that existing technology exists is: designed distribution axis hole system in order to realize the pressure release function and be opened among the annular groove, and can't rigid seal between the axis hole system and the pump housing thereby cause stuffing box gland to be scratched easily and distribute.The utility model is exactly the further improvement of making to the technical problem of the defective of aforementioned existing technology and existence.

The primary technical problem that solves of the utility model provided a kind of its hole system can and the pump housing between realize the distribution shaft that is applicable to the double loop hydraulic pump of rigid seal.

The technological scheme that the primary technical problem that solves the utility model adopts is: be used for the distribution shaft of oil hydraulic pump, comprise axis body; The pressure accumulation chamber; The A vestibule that is communicated with said pressure accumulation chamber respectively, B vestibule, C vestibule; With said axis body radial cross section is reference, said A vestibule, B vestibule, C vestibule be opened on the different cross section respectively and the A vestibule different with B vestibule angle; Said axis body circumferential surface offers a logical oil groove, and said logical oil groove at least a portion and said A vestibule are positioned on the same cross-sectional, and another partly is positioned on the same cross-sectional with said B vestibule at least; Is reference by lifting position toward decline rotated position direction with distribution shaft, and said logical oil groove is arranged in by the B vestibule on the circumferential surface the A vestibule.

The technique effect of the utility model is: the annular groove that plays the pressure release effect in the existing design has at first been cancelled in new design; Offer the B vestibule and be specifically designed to pressure release; The following return opening of offering the existing design of logical oil groove replacement is used to constitute the drainback passage that oil hydraulic pump descends; The aperture of A vestibule and B vestibule all can directly be opened in circumferential surface like this, has created condition for distributing the rigid seal between the axis hole system and the pump housing, as long as the processing and assembling of component such as distribution shaft, the pump housing reaches design accuracy; The accurate Spielpassung of the distribution shaft and the pump housing just can realize rigid seal.

Bright to further releasing of " being reference by lifting position toward decline rotated position direction with distribution shaft, and said logical oil groove is arranged in by the B vestibule on the circumferential surface the A vestibule " in the claim 1: can be with reference to Fig. 7,8,9 for the ease of explanation." rotation " of so-called distribution shaft; Must be for certain reference point beyond the distribution shaft; We suppose to exist beyond the selector valve so fixed reference point Z; " by the B vestibule to the circumferential surface the A vestibule " should be when distribution shaft " rotation " so, and the center line of " B vestibule " is to be introduced into or through reference point Z, and a part of then circumferential surface gets into or through reference point Z successively; Be that the center line of " A vestibule " gets into or through reference point Z at last, aforementioned get into successively or through reference point Z and be positioned at " B vestibule " with " A vestibule " between this part circumferential surface be furnished with " circumferential surface " of " leading to oil groove " exactly.So confirm in the distribution shaft sense of rotation, and " B vestibule " and " A vestibule " gets into or through under the definite situation of the sequencing of reference point Z, is clear and definite and unique its " circumferential surface " that limits.

Technical problem that the utility model secondly solves has provided that a kind of rigid seal and flexible sealing combine, and can to avoid flexible gland be the distribution shaft that is applicable to the double loop hydraulic pump that scratches by pump housing hole.

The technological scheme that the less important technical problem that solves the utility model adopts is: be used for the distribution shaft of oil hydraulic pump, comprise axis body; The pressure accumulation chamber; The A vestibule that is communicated with said pressure accumulation chamber respectively, B vestibule, C vestibule; With said axis body radial cross section is reference, said A vestibule, B vestibule, C vestibule be opened on the different cross section respectively and the A vestibule different with B vestibule angle; Said axis body circumferential surface offers a logical oil groove, and said logical oil groove at least a portion and said A vestibule are positioned on the same cross-sectional, and another partly is positioned on the same cross-sectional with said B vestibule at least; Is reference by lifting position toward decline rotated position direction with distribution shaft, and said logical oil groove is arranged in by the B vestibule on the circumferential surface the A vestibule; Said A vestibule is all offered into step hole with the B vestibule, and wherein the macropore section is installed the stuffing box gland of hollow and exterior edge face camber, and its bottom is propped up by O-ring seals.

The further technique effect of the utility model is: because new design has the rigid seal function; At the A vestibule, after the B vestibule installing stuffing box gland, making not only has rigid seal to also have dynamic flexible sealing between the distribution shaft and the pump housing; The double-sealing of its formation not only makes sealing effect better; And arbitrary sealing means inefficacy, also have another sealing effect to guarantee that hydraulic pump works is normal, obviously durability is better; Secondly; The accurate Spielpassung of the distribution shaft vestibule and the pump housing; Its exterior edge face was limited by pump housing wall among stuffing box gland was installed in vestibule, can not stretch out the aperture, had avoided the seamed edge or the orifice of pump housing hole system to scratch stuffing box gland; Thereby make the oil hydraulic pump durability better, prolonged the working life of oil hydraulic pump greatly.

Further optimal technical scheme: said logical oil groove comprises the logical oil groove of axially offering along said axis body of arc that axially leads to oil groove and offer along circumferential circumferential surface; Said axially logical oil groove at least partly is connected with the logical oil groove of said arc.

Further technique effect: the logical oil groove of the utility model has multiple embodiment and can solve the technical problem of claiming; This is wherein preferable a kind of embodiment; It is not only processed relatively easily, and it offers the less rigid seal that helps between the distribution shaft and the pump housing of area.

Further optimal technical scheme: said axially logical oil groove is a breach that forms along the axial one section circumferential surface of excision of axis body.

Further technique effect: the axially logical oil groove that this excision forms does not have trough rim up and down; Handle through the processing rounding; Just can not scratch each other when pump housing hole system cooperates, thereby the aperture of having protected pump housing hole to be helps the rigid seal of the pump housing with the aperture of pump housing hole system.

Further optimal technical scheme: said logical oil groove is an arc skew curve groove that the said axis body axis rotation in edge is offered.

Further technique effect: the another kind of preferred embodiment of the logical oil groove of the utility model, it offers the less rigid seal that also helps between the distribution shaft and the pump housing of area.

Further optimal technical scheme: said logical oil groove is the arc-shaped cavity offered at the axis body circumferential surface.

Further technique effect: the another kind of preferred embodiment of the logical oil groove of the utility model, this design has reduced the difficulty of processing of logical oil groove.

Further optimal technical scheme: said axis body circumference also has an annular oil groove, and said C vestibule is opened in wherein.

Further technique effect: this design makes the connected state of maintenance of C vestibule and pump housing E hole section but does not influence the rigid seal between the distribution shaft and the pump housing.

Further optimal technical scheme: said axially logical oil groove axial length can be connected with the logical oil groove of said arc, and circumferential width equals or is slightly larger than said pump housing return opening diameter; The logical oil groove circumferential lengths of said arc can be connected with said axially logical oil groove, and axial width equals or is slightly larger than said pump housing D hole section diameter.

Further optimal technical scheme: said axially logical oil groove axial length is connected with the logical oil groove of said arc, and circumferential width and said pump housing return opening diameter are suitable; The logical oil groove circumferential lengths of said arc is connected with said axially logical oil groove, and axial width and said pump housing D hole section diameter are suitable.

Further technique effect: the embodiment's of this logical oil groove width is guaranteeing that hydraulic oil under the flow in the middle of the system of hole, situation that speed reaches designing requirement, reduces to offer area as far as possible and helps the rigid seal between the distribution shaft and the pump housing.

Further optimal technical scheme: said arc skew curve well width equals or is slightly larger than said pump housing D hole section diameter; Perhaps, said logical oil groove width equals or is slightly larger than described pump housing return opening diameter.

Further optimal technical scheme: said arc skew curve well width and said pump housing D hole section diameter are suitable; Perhaps, said arc skew curve well width and described pump housing return opening diameter are suitable.

Further technique effect: the embodiment of this logical oil groove, its width helps the rigid seal between the distribution shaft and the pump housing guaranteeing that hydraulic oil under the flow in the middle of the system of hole, situation that speed reaches designing requirement, reduces to offer area as far as possible.

The 3rd technical problem that the utility model solves has provided a kind of hydraulic hand-pump that can realize rigid seal between the axis hole system and the pump housing that distributes.

The technological scheme that the 3rd technical problem that solves the utility model is adopted is: hydraulic hand-pump comprises the pump housing, pump housing return opening, pump housing D hole section, pump housing E hole section; This hydraulic hand-pump is equiped with aforementioned newly-designed distribution shaft; The corresponding B vestibule of said pump housing return opening rotate path; Said pump housing D hole section corresponding A vestibule rotate path; The rotate path of the corresponding annular oil groove of said pump housing E hole section.

Further technique effect: because newly-designed distribution axis hole system is opened in the axis body circumferential surface, the accurate Spielpassung of the axis body body and the pump housing realizes rigid seal between the distribution shaft and the pump housing.

The 4th technical problem that the utility model solves has provided between a kind of distribution shaft and the pump housing can realize the hard and soft sealing that combines, and stuffing box gland is difficult for being scratched the better hydraulic hand-pump of durability by pump housing hole system.

The technological scheme that the 4th technical problem that solves the utility model adopts is: hydraulic hand-pump comprises the pump housing, pump housing return opening, pump housing D hole section, pump housing E hole section; This hydraulic hand-pump is equiped with this aforementioned newly-designed distribution shaft; The corresponding B vestibule of said pump housing return opening rotate path; Said pump housing D hole section corresponding A vestibule rotate path; The rotate path of the corresponding annular groove of said pump housing E hole section; Said A vestibule is all offered into step hole with the B vestibule, and wherein the macropore section is installed the stuffing box gland of hollow and exterior edge face camber, and its bottom is propped up by O-ring seals.

Further technique effect: thus distribute axis hole system installing stuffing box gland to realize that with the pump housing hard and soft sealing combines, and stuffing box gland has been avoided stuffing box gland to be scratched by the restriction of pump housing wall, makes this hydraulic hand-pump better tightness, longer service life.

Description of drawings

Fig. 1 is the axial sectional structure schematic representation of existing technology distribution shaft.

Fig. 2 is the surface structure schematic representation that the utility model and the pump housing are assembled together.

Fig. 3 is the A-A sectional structure schematic representation of Fig. 2.

Fig. 4 is axial sectional structure schematic representation of the utility model embodiment one.

Fig. 5 is the utility model embodiment one perspective view.

Fig. 6 is the structure for amplifying schematic representation of I shown in Figure 3 portion.

Fig. 7 is one of B-B (step profile) partial sectional view of Fig. 3, is the matching relationship of the utility model and pump housing hole when being in lifting position system.

Fig. 8 be Fig. 3 B-B (step profile) partial sectional view two, the matching relationship of when being the utility model pressure release state and pump housing hole system.

Fig. 9 be Fig. 3 B-B (step profile) partial sectional view three, be the matching relationship of the utility model and pump housing hole when being in lowering position system.

Figure 10 is axial sectional structure schematic representation of the utility model embodiment four.

10. axis body, 11. pressure accumulation chambeies, the 12.A vestibule, the 13.B vestibule, the 14.C vestibule, 15. stuffing box glands, 16.O shape seal ring, 17. axially logical oil grooves, 18. arcs lead to oil groove, 19. annular oil grooves.

30. the pump housing, 31. pump housing return openings, 32.D hole section, 33.E hole section, 34. epicoele oil nozzles, 35. cavity of resorption oil nozzles.

40. plunger.

50. fuel tank

101. filler opening, return opening on 102., 103. times return openings, 104. annular grooves.

Embodiment

Elaborate below in conjunction with the embodiment of accompanying drawing to the utility model, the advantage of further illustrating the utility model reaches the contribution with respect to existing technology.Understandable, following embodiment should not be construed as the restriction to the utility model technological scheme.

Embodiment one:

Like Fig. 2, shown in 3, the pump housing 30 inside are integrated with distribution shaft, plunger 40 etc., the integrated fuel tank 50 of side.Pump housing return opening 31 is communicated with fuel tank 50, and D hole section 32 is opened in inside, the pump housing 30 lower ends with E hole section 33, and its outer end is communicated with cavity of resorption oil nozzle that is threaded in the pump housing 30 bottoms 35 and epicoele oil nozzle 34 respectively.Said upper and lower chamber oil nozzle 34,35 is communicated with oil hydraulic cylinder (not shown) epicoele (rod chamber) and cavity of resorption (rodless cavity) through high-pressure oil pipe.

Like Fig. 4, shown in 5, distribution shaft axis body 10 is whole to become cylindrical, and an axle core has pressure accumulation chamber 11, and the hole is that A vestibule 12, B vestibule 13, C vestibule 14 are opened in axis body 10 circumferential surfacies respectively and are communicated with pressure accumulation chamber 11.C vestibule 14 is opened among the annular oil groove 19, and E hole section 33 is positioned on the rotation path of annular oil groove 19, guarantees that with this C vestibule 14 is on state with the oil hydraulic cylinder epicoele all the time.The rotation path of D hole section 32 corresponding A vestibules 12; The rotation path of pump housing return opening 31 corresponding B vestibules 13; With axis body 10 radial cross sections is reference; It is different that A, B vestibule 12,13 are opened in different cross sections and distribution angle, so that arbitrary vestibule and pump housing hole be when being conducting, another vestibule is in closed condition.Offer the logical oil groove 18 of an arc along axis body 10 circumferential circumferential surfaces, itself and A vestibule 12 are positioned at same radial cross section, and logical oil groove 18 degree of depth of said arc can be preferable between the 0.5mm-2mm according to the design of hydraulic pump flow usually, and present embodiment is 1mm; Axial width is slightly larger than the diameter of D hole section 32, if axial width is less than or equal to the diameter of D hole section 32, the trough rim of the logical oil groove 18 of the arc D hole section 32 that can scratch influences the rigid seal between the distribution shaft and the pump housing; Axially logical oil groove 17 is breach that form along axis body 10 axial one section circumferential surface of excision; The one of which end is connected with the logical oil groove 18 of arc; The other end extends to B vestibule 13 and is positioned on the same radial cross section, when promptly distribution shaft turns to correct position axially logical oil groove 17 can with 31 conductings of pump housing return opening, axially logical oil groove 17 circumferential width are slightly larger than the diameter of pump housing return opening 31; It does not circumferentially have trough rim; With breach jointing place rounding, can not scratch the aperture seamed edge when making it to intersect with pump housing hole system, help the rigid seal between the distribution shaft and the pump housing 30.Axially logical oil groove 17 also can be split into flute profile, but owing to circumferentially trough rim is arranged, so there is not present embodiment preferred.

As shown in Figure 6, A vestibule 12 is offered into step hole, and the stuffing box gland 15 of exterior edge face camber cooperates with the intersegmental crack of macropore, and its bottom is propped up by O-ring seals 16, and stuffing box gland 15 hollow spaces and aperture section form hydraulic oil channel.Can clearly find out among the figure; Be accurate Spielpassung between the distribution shaft and the pump housing 30; A vestibule 12 is directly opened the circumferential surface at axis body 10, and stuffing box gland 15 is limited within the macropore section of A vestibule 12 by the hole wall of the pump housing 30 under by the support of O-ring seals 16, so not only has the sealing of hard and soft combination; And distribution shaft is when rotating, and stuffing box gland can not given prominence to the aperture and scratched and damage by the seamed edge of D hole section 32.A, B vestibule the 12, the 13rd, identical setting.

As shown in Figure 7 and combine Fig. 3, distribution shaft is in lifting position, A vestibule 12 and section 32 conductings of D hole, and swing rocking arm traction plunger 40 suctions-pressure hydraulic oil, one road hydraulic oil is through C vestibule 14, E hole section 33 entering oil hydraulic cylinder epicoeles; Another road hydraulic oil gets into the oil hydraulic cylinder cavity of resorption through A vestibule 12, D hole section 32; After force value reached setting value in the pipeline, fluid-control one-way control valve unit (not shown) was opened, oil hydraulic cylinder upper and lower cavity conducting simultaneously pressure oil, thus form differential circuit between the oil hydraulic cylinder upper and lower cavity, realize the lifting of operator cabin.When stopping swinging plunger 40 or up plunger 40, the fluid-control one-way control valve unit is in closed condition.

As shown in Figure 8 and combine Fig. 3; Distribution shaft rotates in the direction of the clock; To the decline rotated position, the pressure moment beyond the B vestibule 13 and 31 conductings of pump housing return opening, oil hydraulic cylinder epicoele and Pilot operated check valve in the pipeline releases by lifting position; This moment, Pilot operated check valve kept shut, and oil hydraulic cylinder keeps state of rest.

As shown in Figure 9 and combine Fig. 3, distribution shaft to continue rotation in the direction of the clock, logical oil groove 18 of circumferential arc and section 32 conductings of D hole, axially logical simultaneously oil groove 17 and 31 conductings of pump housing return opening; Swing rocking arm traction plunger 40 suction-pressure hydraulic oil, one road hydraulic oil gets into the oil hydraulic cylinder epicoele through C vestibule 14, E hole section 33; Section 32, arc lead to oil groove 18 to cavity of resorption hydraulic oil through the D hole, axially logical oil groove 17, pump housing return opening 31 return fuel tank 50, realize that operator cabin climbs over center of gravity and descends.

Present embodiment employing rigid seal combines with flexible dynamic seal (packing), and stuffing box gland is limited in inside, distribution shaft aperture by pump housing wall, the difficult aperture scratch that is by pump housing hole, thereby realization oil hydraulic pump better tightness, more durable technical purpose.

Embodiment two:

Present embodiment and embodiment's one difference are that the design of logical oil groove is different; Logical oil groove of the embodiment one is combined into the shape of similar " L " by the logical oil groove 18 of axially logical oil groove 17 and arc; The logical oil groove of present embodiment is a curve bath around the rotation of axis spiral on axis body 10 circumferential surfacies; If launch to regard as the plane to this part circumferential surface; This curve bath is an oblique trunking, and its length two ends are conducting pump housing return opening 31 and D hole section 32 respectively, just as from the projection of line on the valve body circumferential surface pump housing return opening 31 to the D hole sections 32.This design of the logical oil groove of present embodiment circumferential surface to offer area less, help the rigid seal between the distribution shaft and the pump housing, but in engineering practice to requirement on machining accuracy than higher, and trough rim may scratch the aperture of pump housing hole system.

Embodiment three:

Present embodiment and embodiment's one, two differences are that the design of logical oil groove is different.Is reference with the rotated position direction with distribution shaft downwards by lifting position; The logical oil groove of present embodiment is the arc-shaped cavity of on the circumferential surface of B vestibule 13 to A vestibules 12 scopes, offering; It is offered area and guarantees that D hole section 32, pump housing return opening 31 are in its coverage area; It is bigger that this kind design makes logical oil groove offer area, is unfavorable for the rigid seal between the distribution shaft and the pump housing.

Embodiment four:

Present embodiment and embodiment's one difference are that the design of A, B vestibule 12,13 is different; Shown in figure 10; A, B vestibule 12,13 are directly offered into the consistent through hole of radial cross section but not step hole; And do not install stuffing box gland additional, distributing between the axis hole system and the pump housing is the rigid seal of precision-fit fully.The present embodiment cost is lower, but sealing means is single, and it is preferred to be not so good as embodiment one.

Claims (11)

1. a distribution shaft comprises axis body (10); Pressure accumulation chamber (11); Radially offer the A vestibule (12) that is communicated with said pressure accumulation chamber (11), B vestibule (13), C vestibule (14) along said axis body (10); It is characterized in that: with said axis body (10) radial cross section is reference, said A vestibule (12), B vestibule (13), C vestibule (14) be opened on the different cross section respectively and A vestibule (12) different with B vestibule (13) distribution angle; Is reference by lifting position toward decline rotated position direction with distribution shaft; Offer a logical oil groove by B vestibule (13) to the circumferential surface the A vestibule (12); Its at least a portion and said A vestibule (12) are positioned on the same cross-sectional, and another partly is positioned on the same cross-sectional with said B vestibule (13) at least.

2. distribution shaft according to claim 1 is characterized in that: said A vestibule (12) is all offered into step hole with B vestibule (13), and wherein the macropore section is installed hollow and exterior edge face stuffing box gland (15) in the arc-shaped, and its bottom is propped up by O-ring seals (16).

3. distribution shaft according to claim 1 and 2 is characterized in that: said logical oil groove comprises along what said axis body (10) was axially offered and axially leads to oil groove (17) and lead to oil groove (18) along the arc of circumferentially offering; Said axially logical oil groove (17) at least partly is connected with the logical oil groove (18) of said arc.

4. distribution shaft according to claim 3 is characterized in that: said axially logical oil groove (17) is a breach that forms along the axial one section circumferential surface of excision of axis body.

5. distribution shaft according to claim 1 and 2 is characterized in that: said logical oil groove is the arc skew curve groove of a said axis body in edge (10) axis rotation.

6. distribution shaft according to claim 1 and 2 is characterized in that: said logical oil groove is the arc-shaped cavity offered at axis body (10) circumferential surface.

7. distribution shaft according to claim 1 and 2 is characterized in that: said axis body (10) circumference also has an annular oil groove (19), and said C vestibule (14) is opened in wherein.

8. distribution shaft according to claim 3 is characterized in that: said axially logical oil groove axial length is connected with the logical oil groove (18) of said arc, and circumferential width and said pump housing return opening (31) diameter are suitable; The logical oil groove circumferential lengths of said arc is connected with said axially logical oil groove (17), and axial width and said pump housing D hole section (32) diameter are suitable.

9. distribution shaft according to claim 5 is characterized in that: said arc skew curve well width and said pump housing D hole section (32) diameter are suitable; Perhaps, said arc skew curve well width and described pump housing return opening (31) diameter are suitable.

10. hydraulic hand-pump comprises the pump housing (30), pump housing return opening (31), D hole section (32), E hole section (33); It is characterized in that: this hydraulic hand-pump is equiped with distribution shaft as claimed in claim 1.

11. hydraulic hand-pump according to claim 10 is characterized in that: said distribution shaft is the described distribution shaft of claim 2.

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