CN207111329U - Plunger assembly, plunger pump and hydraulic transmission - Google Patents

Plunger assembly, plunger pump and hydraulic transmission Download PDF

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Publication number
CN207111329U
CN207111329U CN201721126381.3U CN201721126381U CN207111329U CN 207111329 U CN207111329 U CN 207111329U CN 201721126381 U CN201721126381 U CN 201721126381U CN 207111329 U CN207111329 U CN 207111329U
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CN
China
Prior art keywords
plunger
hole
cylinder
valve plate
oil
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Active
Application number
CN201721126381.3U
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Chinese (zh)
Inventor
叶清
袁瑞康
崔英丽
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HANGZHOU LILONG HYDRAULIC CO LTD
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HANGZHOU LILONG HYDRAULIC CO LTD
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Priority to CN201721126381.3U priority Critical patent/CN207111329U/en
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Publication of CN207111329U publication Critical patent/CN207111329U/en
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Abstract

The utility model discloses a kind of plunger assembly, plunger pump and hydraulic transmission, is related to hydraulic plunger pump technical field.The plunger assembly includes plunger, and plunger includes first and second, and first is column structure, and second is chondritic.First offers first through hole, and second is provided with the second through hole, and first through hole penetrates with the second through hole.Plunger pump includes valve plate, cylinder body and plunger assembly.Cylinder body offers multiple cylinder bores, and plunger assembly is embedded in cylinder bore correspondingly, and valve plate is arranged at the bottom of cylinder body.Valve plate includes oil-feed portion and fuel-displaced portion, and cylinder body drives plunger assembly to suck low pressure oil from the oil-feed portion of valve plate relative to flow disc spins, discharged from the fuel-displaced portion of valve plate with hydraulic oil.The plunger pump is ingenious in design, simple in construction, and plunger uses hollow-core construction good heat dissipation effect, improves suction oiliness energy, reduces noise, reduces production cost.

Description

Plunger assembly, plunger pump and hydraulic transmission
Technical field
Hydraulic plunger pump technical field is the utility model is related to, in particular to a kind of plunger assembly, plunger pump and liquid Press transmission device.
Background technology
Plunger pump is an important device of hydraulic system.It is moved back and forth by plunger in cylinder body, makes seal operation The volume of cavity volume changes to realize oil suction, force feed, is widely used in the field that high pressure, big flow and flow need to adjust Close, in such as hydraulic press, engineering machinery and ship.
The plunger radiating of existing inclined disc type hydraulic axial plunger pump is slow so that locking easily occurs between plunger and cylinder body Failure, valve plate are provided with off-load slot structure so that and the difficulty of processing of the inclined disc type hydraulic axial plunger pump is high, complex process, And the characteristic of suction oil is poor.
In summary, design a kind of good heat dissipation and the suction oiliness energy of existing plunger pump can be improved, be the skill of this area Art personnel technical problem urgently to be resolved hurrily.
Utility model content
The purpose of this utility model is to provide a kind of plunger assembly, ingenious in design, simple in construction, and hollow-core construction design makes Its radiating effect is preferable, and the frictional force of plunger and cylinder body reduces, and effectively improves locking phenomenon.
The purpose of this utility model, which also resides in, provides a kind of plunger pump, includes above-mentioned plunger assembly, improves rate of heat dissipation, Suction oiliness energy is improved, mitigates weight, reduces noise, reduces production cost.
The purpose of this utility model, which also resides in, provides a kind of hydraulic transmission, has the beneficial effect of above-mentioned plunger pump Fruit.
What embodiment of the present utility model was realized in:
Based on above-mentioned purpose, embodiment of the present utility model provides a kind of plunger assembly, including plunger, the plunger Including first and second, described first is column structure and for being embedded in plunger pumping cylinder body, described second For chondritic;
Described first offers first through hole, and described second is provided with the second through hole, the first through hole with it is described Second through hole penetrates.
In addition, the plunger assembly provided according to embodiment of the present utility model, can also have technology additional as follows Feature:
In optional embodiment of the present utility model, the plunger assembly also includes piston shoes, and the piston shoes include coordinating Portion and flat end, the auxiliary section are provided with mating holes, and the mating holes can be engaged with second of the plunger;
The flat end opens up the third through-hole of the mating holes extension of the oriented auxiliary section, and the third through-hole can Connected with the second through hole of the plunger.
In optional embodiment of the present utility model, described first is integrally formed with described second, the plunger First be cylindrical structure, the first through hole is cylindrical hole, the axis of the first through hole and the axis of described first Overlap, the axis of the first through hole overlaps with the axis of second through hole.
It is of the present utility model that embodiment further provides a kind of plunger pump, including valve plate, cylinder body and above-mentioned post Plug assembly;
The cylinder body uniformly offers multiple cylinder bores, and the quantity of the plunger assembly is multiple and one-to-one It is embedded in the cylinder bore, the cylinder body includes bottom and top, and the valve plate is arranged at the bottom of the cylinder body;
The valve plate includes oil-feed portion and fuel-displaced portion, and the cylinder body drives the plunger assembly relative to the flow Disc spins, low pressure oil can be sucked from the oil-feed portion of the valve plate, discharged from the fuel-displaced portion of the valve plate with hydraulic oil.
In optional embodiment of the present utility model, the valve plate includes relative the first side and the second side, described First side is set relative to second side close to the cylinder body;
The valve plate offers central through hole, and the circumference of the oil-feed portion and the fuel-displaced portion along the central through hole is set Put, the fuel-displaced portion offers the first oil outlet and the second oil outlet, and the fuel-displaced portion is arc groove, first oil outlet The bottom land of the arc groove is may be contained within second oil outlet.
In optional embodiment of the present utility model, the valve plate is additionally provided with least one oilhole, the oilhole It can be penetrated with the side wall of first oil outlet.
In optional embodiment of the present utility model, the valve plate is additionally provided with throttle orifice and logical oil groove, the section Discharge orifice can penetrate with the lateral wall of the valve plate;
The logical oil groove is arranged at the first side of the valve plate, and the throttle orifice is located at the bottom land of the logical oil groove.
In optional embodiment of the present utility model, the plunger pump also includes return plate;
The return plate is circular ring structure, including centre bore and multiple fourth holes, the centre bore are located at the backhaul The center of disk, the fourth hole are uniformly distributed around the circumference of the centre bore, the quantity of the fourth hole and the post The quantity of plug assembly is identical and corresponds;
The side wall of the centre bore is the conical surface, and the fourth hole is engaged with the piston shoes of the plunger assembly.
In optional embodiment of the present utility model, the plunger pump also includes ball hinge, the appearance of the ball hinge Face is minor arc, the ball hinge be arranged at one end of the remote valve plate of the cylinder body and with the center of the return plate Hole is engaged.
It is of the present utility model that embodiment further provides a kind of hydraulic transmission, including above-mentioned plunger pump.
The beneficial effect of the utility model embodiment is:It is reasonable in design, simple in construction, rate of heat dissipation is improved, improves suction Oil extraction performance, mitigate weight, reduce noise, reduce production cost, applied widely, practicality is preferable.
Brief description of the drawings
, below will be to required in embodiment in order to illustrate more clearly of the technical scheme of the utility model embodiment The accompanying drawing used is briefly described, it will be appreciated that the following drawings illustrate only some embodiments of the present utility model, therefore The restriction to scope is not construed as, for those of ordinary skill in the art, is not paying the premise of creative work Under, other related accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is the schematic diagram of plunger assembly provided by the utility model;
Fig. 2 is Fig. 1 sectional view;
Fig. 3 is the schematic diagram at the first visual angle of piston shoes in Fig. 1;
Fig. 4 is the schematic diagram at Fig. 3 the second visual angle;
Fig. 5 is the schematic diagram for the plunger pump that the utility model embodiment 2 provides;
Fig. 6 is the schematic diagram of valve plate in Fig. 5;
Fig. 7 is in Fig. 6 VII partial enlarged drawing;
Fig. 8 is the schematic diagram of Fig. 5 middle cylinder bodies;
Fig. 9 is the schematic diagram of return plate in Fig. 5;
Figure 10 is the schematic diagram of ball hinge in Fig. 5.
Icon:100- plunger pumps;10- plunger assemblies;102- plungers;1023- first;1024- first through hole;1025- Second;The through holes of 1026- second;104- piston shoes;1043- auxiliary sections;1044- mating holes;1045- flat ends;1057- the 3rd Through hole;13- valve plates;132- oil-feeds portion;The fuel-displaced portions of 134-;The oil outlets of 1342- first;The oil outlets of 1346- second;136- oil Hole;137- throttle orifices;138- leads to oil groove;15- cylinder bodies;152- cylinder bores;17- return plates;172- centre bores;175- four-ways Hole;19- ball hinges.
Embodiment
To make the purpose, technical scheme and advantage of the utility model embodiment clearer, below in conjunction with this practicality Accompanying drawing in new embodiment, the technical scheme in the utility model embodiment is clearly and completely described, shown So, described embodiment is a part of embodiment of the utility model, rather than whole embodiments.
Therefore, below the detailed description of the embodiment of the present utility model to providing in the accompanying drawings be not intended to limit will The scope of the utility model of protection is sought, but is merely representative of selected embodiment of the present utility model.Based on the utility model In embodiment, the every other implementation that those of ordinary skill in the art are obtained under the premise of creative work is not made Mode, belong to the scope of the utility model protection.
It should be noted that:Similar label and letter represents similar terms in following accompanying drawing, therefore, once a certain Xiang Yi It is defined, then it further need not be defined and explained in subsequent accompanying drawing in individual accompanying drawing.
, it is necessary to which explanation, term " first ", " second ", " the 3rd " etc. are only used for area in description of the present utility model Divide description, and it is not intended that instruction or hint relative importance.
In description of the present utility model, it is also necessary to which explanation, unless otherwise clearly defined and limited, term " are set Put ", " connection " should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected, or be integrally connected;Can To be mechanical connection or electrical connection;Can be joined directly together, can also be indirectly connected by intermediary, Ke Yishi The connection of two element internals.For the ordinary skill in the art, with concrete condition above-mentioned term can be understood at this Concrete meaning in utility model.
Embodiment of the present utility model is described in detail below in conjunction with accompanying drawing, but the utility model can be by weighing Profit requires to limit and the multitude of different ways of covering is implemented.
Wherein Fig. 1-Fig. 4 corresponds to embodiment 1 of the present utility model, and Fig. 5-Figure 10 corresponds to embodiment party of the present utility model Formula 2, the technical scheme of the utility model embodiment is described in detail below in conjunction with accompanying drawing.
Embodiment 1
As depicted in figs. 1 and 2, the plunger assembly 10 that the utility model embodiment 1 provides includes plunger 102 and piston shoes 104, plunger 102 is connected with piston shoes 104 by mating spherical surfaces.
The concrete structure to all parts of the plunger assembly 10 and mutual corresponding relation are carried out specifically below It is bright.
Plunger 102 includes first 1023 and second 1025, and first 1023 for cylindrical-shaped structure and for being embedded In the cylinder body 15 of plunger pump 100, first 1023 offers first through hole 1024, the axle of the first through hole 1024 along cylinder To setting.
Optionally, the first through hole 1024 can be the cylindrical hole of rule, or irregular through hole, in this practicality In new embodiment 1, the first through hole 1024 is cylindrical hole, and the axis of the first through hole 1024 and first 1023 Axis overlaps so that first 1023 of the plunger 102 is the hollow-core construction for waiting wall thickness.
Optionally, second 1025 is chondritic, the second through hole 1026 is provided with second 1025, second through hole 1026 penetrate with the first through hole 1024 of first 1023, in embodiment 1 of the present utility model, the axle of the second through hole 1026 Line overlaps with the axis of first through hole 1024, and the diameter of the second through hole 1026 is less than the diameter of first through hole 1024.
First 1023 one end is provided with chamfering in the second through hole 1026 so that the port of export of plunger 102 Size is more than the diameter dimension of the second through hole 1026.
Specifically, piston shoes 104 include auxiliary section 1043 and flat end 1045, the piston shoes 104 are step-like cylinder knot Structure, i.e. flat end 1045 are discoideus, and auxiliary section 1043 is located at the side of flat end 1045, and the outer surface of auxiliary section 1043 Diameter dimension be less than flat end 1045 outer surface diameter size.
It refer to shown in Fig. 3 and Fig. 4, the side of the remote flat end 1045 of the auxiliary section 1043 is provided with mating holes 1044, optionally, the mating holes 1044 is shaped as dome shape and can be engaged with second 1025 of plunger 102 so that Second 1025 of plunger 102 can be in the internal rotation of auxiliary section 1043 of piston shoes 104.
Flat end 1045 offers third through-hole 1057, and the third through-hole 1057 is located at the centre bit of flat end 1045 Put and extend to the mating holes 1044 of auxiliary section 1043, after the piston shoes 104 combine assembling with plunger 102, third through-hole 1057 It can be connected with the second through hole 1026 of plunger 102.
In embodiment 1 of the present utility model, one end of the close auxiliary section 1043 of third through-hole 1057 is provided with down Angle.
The plunger assembly 10 that embodiment 1 of the present utility model provides, ingenious in design, simple in construction, hollow-core construction design So that the radiating effect of plunger 102 is preferable, while weight reduces so that the frictional force of plunger 102 and cylinder body 15 reduces, effectively The generation for improving locking failure between existing plunger 102 and cylinder body 15, improve the suction oiliness energy of plunger pump 100.
Embodiment 2
The utility model embodiment 2 provides a kind of plunger pump 100, refer to shown in Fig. 5, including valve plate 13, cylinder The plunger assembly 10 that body 15, return plate 17, ball hinge 19 and embodiment 1 provide, is described as follows:
First, the concrete structure of valve plate 13 is discussed in detail, refer to shown in Fig. 6, the valve plate 13 is discoideus structure And central through hole is provided with, the valve plate 13 includes relative the first side and the second side, and the He of oil-feed portion 132 is provided with the first side Fuel-displaced portion 134, the oil-feed portion 132 and fuel-displaced portion 134 are along the circumferentially disposed of central through hole.
In the utility model embodiment 2, oil-feed portion 132 penetrates from the first side to the second side and set, and fuel-displaced portion 134 is Arc groove, the first oil outlet 1342 and the second oil outlet 1346 are offered in the arc groove, first oil outlet 1342 It is through hole with the second oil outlet 1346, optionally, the oil outlet 1346 of the first oil outlet 1342 and second may be contained within arc The bottom land of connected in star.
Optionally, at least one oilhole 136 is additionally provided with the valve plate 13, the oilhole 136 is close to the first oil outlet 1342 set and can be penetrated with the side wall of the first oil outlet 1342.In the utility model is embodiment 2, oilhole 136 Quantity is three, and the side wall of the first oil outlet 1342 offers a hole, three oilholes 136 Kong Lian with the side wall respectively It is logical.
Optionally, the valve plate 13 is additionally provided with throttle orifice 137 and logical oil groove 138, refer to shown in Fig. 7, the throttle orifice 137 can penetrate with the lateral wall of valve plate 13, and the logical oil groove 138 is arranged at the first side of valve plate 13 and causes throttle orifice 137 positioned at logical oil groove 138 bottom land, in embodiment 2 of the present utility model, whole oilholes 136, throttle orifice 137 and logical Oil groove 138 is respectively positioned on the first side of valve plate 13.
The oil-feed portion 132 is separate disconnected state with fuel-displaced portion 134, and first positioned at fuel-displaced portion 134 is fuel-displaced Hole 1342 can be connected with the second oil outlet 1346 by arc groove.Cylinder body 15 drives plunger assembly 10 relative to valve plate 13 rotations, can enter low pressure oil from the oil-feed portion 132 of valve plate 13, the valve plate 13 coordinates with above-mentioned plunger assembly 10 Use so that hydraulic oil is from first oil outlet 1342 in the fuel-displaced portion 134 of valve plate 13 and the second oil outlet 1346 with high pressure oily State is discharged, and can reduce noise, while is prevented from cavitating, reduced high-voltage oil liquid the bottom of cylinder body 15 is washed away.
Then, the concrete structure of cylinder body 15 is discussed in detail, refer to shown in Fig. 8, cylinder body 15 is column structure, is opened up There is central through hole, circumferentially uniform in central through hole offers multiple cylinder bores 152, the quantity and plunger of the cylinder bore 152 The quantity of component 10 is identical and corresponds, and the cylinder bore 152 is used to be embedded plunger assembly 10, makes first of plunger assembly 10 1023 are arranged in cylinder bore 152, and the piston shoes 104 of plunger assembly 10 are located at outside cylinder bore 152.
The cylinder body 15 includes bottom and top, and the cylinder bore 152 of bottom is shaped as oval poroid, the cylinder bore at top 152 is cylindric, and valve plate 13 is arranged at the bottom of cylinder body 15, and the first side of valve plate 13 is relative to the second side close to cylinder Body 15 is set, and specially the oilhole 136 of valve plate 13, throttle orifice 137 and logical oil groove 138 both face towards cylinder body 15 and set.
Cylinder body 15 drives plunger assembly 10 relative to the rotary motion of valve plate 13, can be by low pressure oil from valve plate 13 Oil-feed portion 132 sucks, and is discharged from the fuel-displaced portion 134 of valve plate 13 in the form of hydraulic oil.
Then, return plate 17 and the concrete structure of ball hinge 19 are introduced, refer to shown in Fig. 9 and Figure 10, the return plate 17 For annular shape, including centre bore 172 and multiple fourth holes 175, wherein, centre bore 172 is located at the center of return plate 17, Whole fourth holes 175 are uniformly distributed around the circumference of centre bore 172, meanwhile, quantity and the plunger assembly 10 of fourth hole 175 Quantity it is identical and correspond.
Optionally, centre bore 172 is the small conical surface shape in the big one end in one end, is coordinated with the outer surface of ball hinge 19, In assembling, the piston shoes 104 of the plunger assembly 10 can be connected after being passed through from fourth hole 175 with plunger 102, so as to cylinder Body 15 drives plunger assembly 10 and the rotary motion of return plate 17.
Ball hinge 19 is spherical calotte, and its vertical sectional shape is minor arc, and the ball hinge 19 is arranged at the remote of cylinder body 15 One end of valve plate 13, and the ball hinge 19 can be engaged with the centre bore 172 of return plate 17, ball hinge 19 and return plate 17 Between be linear contact lay, change the existing face way of contact, play a part of support return plate 17, oil shock can be reduced, Improve oil suction and oil extraction and performance.
The beneficial effect of plunger pump 100 that the utility model embodiment 2 provides is:Reasonable in design, clever structure, not only Noise can be reduced, also improves the rate of heat dissipation of plunger assembly 10, alleviates the weight of plunger assembly 10, is effectively improved plunger group The situation of locking occurs between part 10 and cylinder body 15, meanwhile, the suction oiliness energy of the plunger pump 100 is improved, reduces post Production, the difficulty of processing of pump 100 are filled in, reduces production cost.
Embodiment 3
The utility model embodiment 3 provides the plunger pump in a kind of hydraulic transmission, including above-mentioned embodiment 2 100, it is described as follows:
The plunger pump 100 can realize high pressure, high speed and big flow, can be widely used in engineering machinery, lifting The fields such as transport, metallurgical, ship and aviation.
Because plunger 102 employs hollow-core construction in the plunger pump 100, heat dissipation capacity is improved in use, effectively The probability for improving existing plunger 102 and cylinder body 15 and locking failure occurring, coordinate the plunger assembly 10 to valve plate 13 Structure is improved, can noise-decreasing, prevent from cavitating, reduce high-voltage oil liquid the bottom of cylinder body 15 is washed away, further Noise is reduced, improves the suction oiliness energy of plunger pump 100.
It should be noted that in the case where not conflicting, the feature in embodiment in the utility model can be mutual With reference to.
Preferred embodiment of the present utility model is the foregoing is only, is not limited to the utility model, for For those skilled in the art, the utility model can have various modifications and variations.It is all in spirit of the present utility model and former Within then, any modification, equivalent substitution and improvements made etc., it should be included within the scope of protection of the utility model.

Claims (10)

1. a kind of plunger assembly (10), it is characterised in that including plunger (102), the plunger (102) includes first (1023) With second (1025), described first (1023) are column structure and are used to be embedded the cylinder body (15) in plunger pump (100) Interior, described second (1025) are chondritic;
First (1023) offer first through hole (1024), and second (1025) are provided with the second through hole (1026), the first through hole (1024) penetrates with second through hole (1026).
2. plunger assembly (10) according to claim 1, it is characterised in that the plunger assembly (10) also includes piston shoes (104), the piston shoes (104) include auxiliary section (1043) and flat end (1045), and the auxiliary section (1043), which is provided with, matches somebody with somebody Close hole (1044), the mating holes (1044) can be engaged with second (1025) of the plunger (102);
The flat end (1045) opens up the third through-hole of mating holes (1044) extension of the oriented auxiliary section (1043) (1057), the third through-hole (1057) can connect with the second through hole (1026) of the plunger (102).
3. plunger assembly (10) according to claim 1, it is characterised in that first (1023) and described second (1025) it is integrally formed, first (1023) of the plunger (102) are cylindrical structure, and the first through hole (1024) is cylinder Hole, the axis of the first through hole (1024) overlap with the axis of first (1023), the first through hole (1024) Axis overlaps with the axis of second through hole (1026).
4. a kind of plunger pump (100), it is characterised in that any including valve plate (13), cylinder body (15) and claim 1-3 Plunger assembly (10) described in one;
The cylinder body (15) uniformly offers multiple cylinder bores (152), the quantity of the plunger assembly (10) to be multiple and It is embedded at correspondingly in the cylinder bore (152), the cylinder body (15) includes bottom and top, the valve plate (13) It is arranged at the bottom of the cylinder body (15);
The valve plate (13) includes oil-feed portion (132) and fuel-displaced portion (134), and the cylinder body (15) drives the plunger assembly (10) rotate, low pressure oil can be sucked from the oil-feed portion (132) of the valve plate (13) relative to the valve plate (13), from The fuel-displaced portion (134) of the valve plate (13) is discharged with hydraulic oil.
5. plunger pump (100) according to claim 4, it is characterised in that the valve plate (13) includes relative first Side and the second side, first side are set relative to second side close to the cylinder body (15);
The valve plate (13) offers central through hole, and the oil-feed portion (132) and the fuel-displaced portion (134) lead to along the center Hole it is circumferentially disposed, the fuel-displaced portion (134) offers the first oil outlet (1342) and the second oil outlet (1346), described fuel-displaced Portion (134) is arc groove, and first oil outlet (1342) and second oil outlet (1346) may be contained within the arc The bottom land of groove.
6. plunger pump (100) according to claim 5, it is characterised in that the valve plate (13) is additionally provided with least one Individual oilhole (136), the oilhole (136) can penetrate with the side wall of first oil outlet (1342).
7. plunger pump (100) according to claim 5, it is characterised in that the valve plate (13) is additionally provided with throttle orifice (137) can be penetrated with logical oil groove (138), the throttle orifice (137) with the lateral wall of the valve plate (13);
The logical oil groove (138) is arranged at the first side of the valve plate (13), and the throttle orifice (137) is located at the logical oil groove (138) bottom land.
8. plunger pump (100) according to claim 4, it is characterised in that the plunger pump (100) also includes return plate (17);
The return plate (17) is circular ring structure, including centre bore (172) and multiple fourth holes (175), the centre bore (172) it is located at the center of the return plate (17), the fourth hole (175) is around the circumferential uniform of the centre bore (172) Distribution, the quantity of the fourth hole (175) is identical with the quantity of the plunger assembly (10) and corresponds;
The side wall of the centre bore (172) is the conical surface, the fourth hole (175) and the piston shoes of the plunger assembly (10) (104) it is engaged.
9. plunger pump (100) according to claim 8, it is characterised in that the plunger pump (100) also includes ball hinge (19), the outer surface of the ball hinge (19) is minor arc, and the ball hinge (19) is arranged at the remote institute of the cylinder body (15) State one end of valve plate (13) and be engaged with the centre bore (172) of the return plate (17).
10. a kind of hydraulic transmission, it is characterised in that including the plunger (100) described in claim 4-9 any one.
CN201721126381.3U 2017-09-04 2017-09-04 Plunger assembly, plunger pump and hydraulic transmission Active CN207111329U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201721126381.3U CN207111329U (en) 2017-09-04 2017-09-04 Plunger assembly, plunger pump and hydraulic transmission

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201721126381.3U CN207111329U (en) 2017-09-04 2017-09-04 Plunger assembly, plunger pump and hydraulic transmission

Publications (1)

Publication Number Publication Date
CN207111329U true CN207111329U (en) 2018-03-16

Family

ID=61574530

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201721126381.3U Active CN207111329U (en) 2017-09-04 2017-09-04 Plunger assembly, plunger pump and hydraulic transmission

Country Status (1)

Country Link
CN (1) CN207111329U (en)

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