CN201190641Y - Axial plunger type hydraulic motor or pump - Google Patents
Axial plunger type hydraulic motor or pump Download PDFInfo
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- CN201190641Y CN201190641Y CNU2008200767653U CN200820076765U CN201190641Y CN 201190641 Y CN201190641 Y CN 201190641Y CN U2008200767653 U CNU2008200767653 U CN U2008200767653U CN 200820076765 U CN200820076765 U CN 200820076765U CN 201190641 Y CN201190641 Y CN 201190641Y
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- plunger
- axial bore
- spring seat
- spring
- axial
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Abstract
The utility model relates to an axial plunger type hydraulic motor or pump which comprises a transmission shaft, a shell body, a swash plate, a cylinder body, plungers, a port plate and springs and is characterized in that steel balls and spring seats arranged in axial shaft hole of each plunger are also provided; the extension end of each spring, which extends inside from an axial hole of a corresponding plunger of the spring is limited by one spring seat in the axial hole of the plunger; the left and the right sides of one steel ball in the axial hole of the plunger are respectively limited by a recess at the central part of the bottom of the axial hole and a recess at the central part of the outer lateral wall of the spring seat; the recess at the central part of the bottom of the axial hole takes a symmetric structure with respect to the axial central line of the plunger, and the recess at the central part of the outer lateral wall of the spring seat takes a symmetric structure with respect to the axial central line of the spring seat. The axial plunger type hydraulic motor or pump can allow the springs to act upon the central positions of the plungers all the time so as to reduce the abrasion and improve the mechanical efficiency.
Description
Technical field
The utility model relates to a kind of axial-piston hydraulic motor or pump, especially with described oil hydraulic motor or pump in plunger relevant with this structure of spring to auxiliary connection.
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.When spring reset, act directly on the plunger by spring.Because telescopic spring causes its vary in diameter, the axial bore of spring and plunger must be gapped, makes spring accurately not locate, like this central position that affacts plunger that spring force can not be uniform and stable (being on the longitudinal center line of plunger).And, cylinder body is when rotating with transmission shaft, and the existing to-and-fro motion along the drive shaft axis direction of plunger has again because the rotation that the effect of swash plate frictional force causes, spring can not accurately be located, make the central position that affacts plunger that spring force can not be uniform and stable.Also have, at the spring time rotational, the plane contact of spring end face and plunger causes very big resistance for the rotation of plunger, has increased wearing and tearing, has reduced the mechanical efficiency and the life-span of motor (or pump).CN2523985 Y discloses a kind of high-pressure low-flow plunger pump, swash plate in the housing is by transmission shaft and flat key driven rotary thereof, piston shoes are close to swash plate, the swash plate rotation drives piston shoes one trunk piston set and moves up and down, the central spring compression is housed at interior cover and steel ball in cylinder body, remake and be used on the swash plate, thereby piston shoes and swash plate are fitted tightly, rotate when transmission shaft drives swash plate, when plunger and piston shoes were moved toward low spot by height point at swash plate, action of hydraulic force was on valve, open valve and finish oil extraction, and during toward high some motion, produce vacuum by low spot at swash plate when plunger and piston shoes, thereby oil suction.CN1356466A discloses a kind of low-noise hydraulic planger pump that has accumulator, and it is by cylinder body, flange, and accumulator, plunger, piston shoes, platen, steel ball, interior cover, spring, main shaft, thrust plate is formed.Accumulator is installed in the center small through hole of plunger, near on the big center hole interior edge face of plunger of thrust plate one end the flange that in axial direction has several small through hole is housed.These technology to how making spring can both act on the central position of plunger all the time reduce wear, and all do not provide the technological scheme of directiveness.
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 spring can both act on the central position of plunger all the time, thereby reduces wear, and improves mechanical efficiency.
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, it is spacing by the bottom of (corresponding with it) plunger hole from the external part that the axial bore of the plunger corresponding with it stretches out for described each spring, its technological scheme is that it also has interior steel ball and the spring seat of axial bore that is installed on each plunger, it is spacing by the spring seat in the axial bore of this plunger from the inserting end that the axial bore of the plunger corresponding with it stretches into for described each spring, the left and right sides of the steel ball in the axial bore of each plunger is spacing by the depression in the depression at the axial bore bottom center position of this plunger and spring seat outer side wall center portion respectively, being recessed in of the axial bore bottom center position of each plunger is concyclic and be symplex structure with respect to the longitudinal center line of this plunger with the point of contact of steel ball, being recessed in of spring seat outer side wall center portion is concyclic and be symplex structure, the longitudinal center line conllinear of the longitudinal center line of plunger and spring seat with respect to the longitudinal center line of spring seat with the point of contact of steel ball.
In the technique scheme, the depression at the axial bore bottom center position of each plunger can be round taper hole, and diameter of a circle can be identical with the diameter of the axial bore of plunger at the bottom of this round taper hole; The depression in spring seat outer side wall center portion can be round taper hole, like this, the part of the left and right sides of the steel ball in the axial bore of each plunger falls in the round taper hole at axial bore bottom center position of this plunger respectively and cooperates with it in the round taper hole in spring seat outer side wall center portion and held spacing by it.The diameter of its outer peripheral surface of spring seat in the axial bore of each above-mentioned plunger can be less than the diameter of the axial bore of this plunger.Its outer peripheral surface of spring seat in the axial bore of each above-mentioned plunger and the axial bore of this plunger can Spielpassung.Its outer peripheral surface of spring seat in the axial bore of each above-mentioned plunger and the best interference fit of axial bore of this plunger.The bottom of each above-mentioned plunger hole preferably has a cylindrical hole, the diameter of this cylindrical hole and the external diameter of spring adapt, and its external part of stretching out from the axial bore of the plunger corresponding with it of described each spring enters that this cylindrical hole cooperates with it and be spacing by it.
The utlity model has steel ball and spring seat in the axial bore that is installed on each plunger, it is spacing by the spring seat in the axial bore of this plunger from the inserting end that the axial bore of the plunger corresponding with it stretches into for described each spring, the left and right sides of the steel ball in the axial bore of each plunger is spacing by the depression in the depression at the axial bore bottom center position of this plunger and spring seat outer side wall center portion respectively, being recessed in of the axial bore bottom center position of each plunger is concyclic and be symplex structure with respect to the longitudinal center line of this plunger with the point of contact of steel ball, being recessed in of spring seat outer side wall center portion is concyclic and be symplex structure, the longitudinal center line conllinear of the longitudinal center line of plunger and spring seat with respect to the longitudinal center line of spring seat with the point of contact of steel ball.It improves plunger and this structure to auxiliary connection of spring of original oil hydraulic motor (or pump) like this, by architecture advances and the way of contact that changes spring and plunger (middle steel ball and the spring seat of increasing to plunger, can also increase position structure at the spring the other end simultaneously), make spring under any circumstance can both act on the central position (being on the longitudinal center line of plunger) of plunger all the time, no matter plunger is to move reciprocatingly or doing spinning motion, the capital is at the center of cylinder inner bore (plunger hole), guaranteed annular gap between the axial bore of plunger and cylinder inner bore (plunger hole) and spring and plunger evenly, make plunger stressed evenly, wearing and tearing have been reduced, reduce leakage, improved efficient.Moreover, because the effect of steel ball, the rotation of plunger or spring is finished along itself and the rotation of above-mentioned depression surface of contact or rolling by steel ball, be spring seat with plunger between relatively rotate all lean on itself with steel ball between cooperate and finish, make the planar slide friction between spring and the plunger become rolling friction, significantly reduce frictional force, improved mechanical efficiency, thereby improved the mechanical efficiency of whole motor (or pump).
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.
Embodiment
As shown in Figure 2, the utlity model has transmission shaft 1, housing 9, swash plate 2, cylinder body 4, plunger 3, thrust plate 8, spring 7.The middle part circular hole that transmission shaft 1 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, and an above-mentioned spring 7 is installed in the axial bore of each plunger, and it is spacing by the bottom of (corresponding with it) plunger hole from the external part that the axial bore of the plunger corresponding with it stretches out for described each spring 7.Structural feature of the present utility model is that it also has interior steel ball 5 and the spring seat 6 of axial bore that is installed on each plunger.Spring seat is the cylinder bodily form of variable cross section, can be processed by round steel.Its inserting end of stretching into from the axial bore of the plunger corresponding with it of described each spring is spacing by the spring seat in the axial bore of this plunger 6 shaft shoulder of madial wall variable cross section ().The left and right sides of the steel ball 5 in the axial bore of each plunger is spacing by the depression in the depression at the axial bore bottom center position of this plunger and spring seat 6 outer side wall center portions respectively.Being recessed in of the axial bore bottom center position of each plunger is concyclic and be symplex structure with respect to the longitudinal center line of this plunger with the point of contact of steel ball, promptly passing through the section line (surface intersection line or intersecting line) of recessed side walls at the axial bore bottom center position of the cutting plane of longitudinal center line of plunger and this plunger, is symmetrical with respect to the longitudinal center line of this plunger.Being recessed in of spring seat 6 outer side wall center portions is concyclic and be symplex structure with respect to the longitudinal center line of spring seat with the point of contact of steel ball, promptly passing through the section line of the recessed side walls in the cutting plane of longitudinal center line of spring seat and spring seat outer side wall center portion, is symmetrical with respect to the longitudinal center line of spring seat.The longitudinal center line conllinear of the longitudinal center line of plunger and spring seat.The axial symmetrical center line at the axial bore bottom center position (center region) of each plunger and the axial symmetrical center line in spring seat outer side wall center portion (center region) overlap (conllinear) with the longitudinal center line (being similar to) of plunger, and the axial symmetrical center line of described (two) depression overlaps with the longitudinal center line (being similar to) of plunger.The depression at the axial bore bottom center position of above-mentioned each plunger (can) be round taper hole, diameter of a circle at the bottom of this round taper hole (can) identical with the diameter of the axial bore of plunger.The depression in spring seat 6 outer side wall center portions (can) be round taper hole (perhaps being the spherical depression that the part with steel ball matches).Described (two) depression can also be other shape, as curvecd surface type (recessed side walls is a curved surface).The part of the left and right sides of the steel ball 5 in the axial bore of each plunger falls in the round taper hole at axial bore bottom center position of this plunger respectively and cooperates with it in the round taper hole in spring seat 6 outer side wall center portions and held spacing by it.Certainly, the depression in the depression at the axial bore bottom center position of each plunger, spring seat outer side wall center portion can also be other shape.Intermediate portion between the left and right sides of steel ball 5 is independently, both do not fallen into the round taper hole interior (in the depression) at the axial bore bottom center position of plunger, also do not fall into the round taper hole interior (in the depression) in spring seat 6 outer side wall center portions, steel ball and spring seat work together and just can not interfere like this.The diameter of spring seat 6 its outer peripheral surfaces in the axial bore of each above-mentioned plunger can be less than the diameter of the axial bore of this plunger, gapped between the two, it or not nested relationship, certainly, also can nested relationship between the two, be interior spring seat 6 its outer peripheral surfaces and the axial bore Spielpassung of this plunger, perhaps spring seat 6 its outer peripheral surfaces in the axial bore of each plunger and the axial bore interference fit of this plunger of axial bore of each plunger.The bottom of each above-mentioned plunger hole has a cylindrical hole, the diameter of this cylindrical hole and the external diameter of spring adapt, and its external part of stretching out from the axial bore of the plunger corresponding with it of described each spring enters that this cylindrical hole cooperates with it and be spacing by it.
The round taper hole at the axial bore bottom center position of each plunger of the present utility model (depression, i.e. steel ball nest) wants high with the plunger outer circles, is preferably 0.002～0.01mm.The round taper hole in spring seat outer side wall center portion (depression, i.e. steel ball nest) wants high with the coaxality of the outer peripheral surface of spring seat, is preferably 0.002～0.01mm.The spring the other end is also wanted corresponding accurate positioning.In same motor (pump), this combination (being the combination of steel ball, spring seat, spring) total length error is not more than 0.1mm.
The utility model is applicable to various axial piston motors and pump, for example utilizes this technology, can produce emulsion motor and rig.
Claims (6)
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, it is spacing by the bottom of plunger hole from the external part that the axial bore of the plunger corresponding with it stretches out for described each spring, it is characterized in that it also has interior steel ball (5) and the spring seat (6) of axial bore that is installed on each plunger, it is spacing by the spring seat in the axial bore of this plunger (6) from the inserting end that the axial bore of the plunger corresponding with it stretches into for described each spring, the left and right sides of the steel ball (5) in the axial bore of each plunger is spacing by the depression in the depression at the axial bore bottom center position of this plunger and spring seat (6) outer side wall center portion respectively, being recessed in of the axial bore bottom center position of each plunger is concyclic and be symplex structure with respect to the longitudinal center line of this plunger with the point of contact of steel ball, being recessed in of spring seat (6) outer side wall center portion is concyclic and be symplex structure, the longitudinal center line conllinear of the longitudinal center line of plunger and spring seat with respect to the longitudinal center line of spring seat with the point of contact of steel ball.
2, oil hydraulic motor according to claim 1 or pump is characterized in that the depression at the axial bore bottom center position of above-mentioned each plunger is round taper hole, and diameter of a circle is identical with the diameter of the axial bore of plunger at the bottom of this round taper hole; The depression in spring seat (6) outer side wall center portion is round taper hole, and the part of the left and right sides of the steel ball (5) in the axial bore of each plunger falls in the round taper hole at axial bore bottom center position of this plunger respectively and cooperation and held spacing by it with it in the round taper hole in spring seat (6) outer side wall center portion.
3, oil hydraulic motor according to claim 1 or pump is characterized in that the diameter of the diameter of its outer peripheral surface of spring seat (6) in the axial bore of each above-mentioned plunger less than the axial bore of this plunger.
4, oil hydraulic motor according to claim 1 or pump is characterized in that its outer peripheral surface of spring seat (6) in the axial bore of each above-mentioned plunger and the axial bore Spielpassung of this plunger.
5, oil hydraulic motor according to claim 1 or pump is characterized in that its outer peripheral surface of spring seat (6) in the axial bore of each above-mentioned plunger and the axial bore interference fit of this plunger.
6, oil hydraulic motor according to claim 1 or pump, the bottom that it is characterized in that each above-mentioned plunger hole has a cylindrical hole, and its external part of stretching out from the axial bore of the plunger corresponding with it of described each spring enters that this cylindrical hole cooperates with it and be spacing by it.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200767653U CN201190641Y (en) | 2008-05-13 | 2008-05-13 | Axial plunger type hydraulic motor or pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200767653U CN201190641Y (en) | 2008-05-13 | 2008-05-13 | Axial plunger type hydraulic motor or pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201190641Y true CN201190641Y (en) | 2009-02-04 |
Family
ID=40334801
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008200767653U Expired - Fee Related CN201190641Y (en) | 2008-05-13 | 2008-05-13 | Axial plunger type hydraulic motor or pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201190641Y (en) |
-
2008
- 2008-05-13 CN CNU2008200767653U patent/CN201190641Y/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090204 Termination date: 20110513 |