GB2583128A - A hydraulic pump - Google Patents

A hydraulic pump Download PDF

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Publication number
GB2583128A
GB2583128A GB1905524.3A GB201905524A GB2583128A GB 2583128 A GB2583128 A GB 2583128A GB 201905524 A GB201905524 A GB 201905524A GB 2583128 A GB2583128 A GB 2583128A
Authority
GB
United Kingdom
Prior art keywords
contact surface
vane
inner contact
cavity
fluid chamber
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
GB1905524.3A
Other versions
GB201905524D0 (en
Inventor
Zhou Quanbao
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Chongqing Changan Automobile Co Ltd
Changan UK R&D Centre Ltd
Original Assignee
Chongqing Changan Automobile Co Ltd
Changan UK R&D Centre Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Chongqing Changan Automobile Co Ltd, Changan UK R&D Centre Ltd filed Critical Chongqing Changan Automobile Co Ltd
Priority to GB1905524.3A priority Critical patent/GB2583128A/en
Publication of GB201905524D0 publication Critical patent/GB201905524D0/en
Priority to CN201910777784.1A priority patent/CN111173739B/en
Publication of GB2583128A publication Critical patent/GB2583128A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/30—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
    • F04C2/34—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members
    • F04C2/344—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member
    • F04C2/3441—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member the inner and outer member being in contact along one line or continuous surface substantially parallel to the axis of rotation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/30—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
    • F04C2/34—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members
    • F04C2/344—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/30—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
    • F04C2/34—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members
    • F04C2/344—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member
    • F04C2/3441—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member the inner and outer member being in contact along one line or continuous surface substantially parallel to the axis of rotation
    • F04C2/3442—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member the inner and outer member being in contact along one line or continuous surface substantially parallel to the axis of rotation the surfaces of the inner and outer member, forming the working space, being surfaces of revolution
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
    • F01C21/00—Component parts, details or accessories not provided for in groups F01C1/00 - F01C20/00
    • F01C21/10—Outer members for co-operation with rotary pistons; Casings
    • F01C21/104—Stators; Members defining the outer boundaries of the working chamber
    • F01C21/106—Stators; Members defining the outer boundaries of the working chamber with a radial surface, e.g. cam rings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
    • F01C21/00—Component parts, details or accessories not provided for in groups F01C1/00 - F01C20/00
    • F01C21/08—Rotary pistons
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
    • F04C18/30—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
    • F04C18/34—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F04C18/08 or F04C18/22 and relative reciprocation between the co-operating members
    • F04C18/344—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F04C18/08 or F04C18/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Rotary Pumps (AREA)

Abstract

A hydraulic pump comprising a fluid chamber housing 12 and rotor assembly, being movable relative to one another arranged to move fluid along an inner contact surface 34 (chamber circumference) from an inlet to an outlet. The rotor assembly comprising a vane to push the fluid via a fluid contact surface with a chamber contact surface 32 configured to slide over the inner contact surface, the inner contact surface comprising a cavity 40’ (a circumferential groove) located between adjacent outer edges 44a, 44b, defining a non-contact portion 42 between the vane and inner contact surface. The outer end portions (edges) 46a, 46b of the vane may remain in contact with the circumferential chamber wall (inner contact surface) when sliding over the cavity, or may remain in contact while sliding over the entire inner contact surface. The fluid chamber housing may include a sealing portion 50, the cavity positioned outside of the sealing portion. The cavity may be an elongate groove, and there may be a plurality of cavities on the inner contact surface.

Description

A HYDRAULIC PUMP
This invention relates to a hydraulic pump.
It is known to use a hydraulic pump to provide a flow of fluid so as to maintain a pressure requirement of associated downstream equipment in a hydraulic control system, for example an internal combustion engine or automatic transmission of a motor vehicle.
According to a first aspect of the invention there is provided a hydraulic pump comprising a fluid chamber housing and a rotor assembly, the fluid chamber housing and rotor assembly cooperating with one another to define a fluid chamber therebetween, the fluid chamber housing and the rotor assembly being moveable relative to one another to move fluid in the fluid chamber along an inner contact surface of the fluid chamber housing from an inlet to an outlet of the hydraulic pump, the rotor assembly including a vane configured to push the fluid via a fluid contact surface of the vane when the rotor assembly and fluid chamber housing are moving relative to one another, the vane further including a chamber contact surface configured to slide over the inner contact surface of the fluid chamber housing when the rotor assembly and fluid chamber housing are moving relative to one another, the inner contact surface including a cavity disposed thereon defining a non-contact portion between the fluid chamber housing and the vane, wherein the cavity is located between adjacent outer edges of the inner contact surface.
The fluid chamber housing having a cavity disposed on the inner contact surface which defines a non-contact portion between the fluid chamber housing and the vane means that the sliding contact surface area between the chamber contact surface of the vane and the inner contact surface of the fluid chamber housing is reduced. As a result, the friction between the vane and the fluid chamber housing is also reduced, which improves the overall efficiency of the hydraulic pump.
Moreover, the cavity being located between adjacent outer edges of the inner contact surface means that a larger area of the inner contact surface can be selected for the cavity, thus increasing the area of non-contact between the vane and the fluid chamber housing, while still providing the vane with adequate support.
The inclusion of such a cavity therefore improves the efficiency of the hydraulic pump while maintaining stable operation of the pump.
Preferably, the inner contact surface is configured to permit both outer end portions of the chamber contact surface to remain in contact with the inner contact surface when the vane slides over the cavity.
The inner contact surface being so configured means that the vane is supported at both outer end portions when the vane slides over the cavity. The vane being so supported helps to prevent the vane oscillating during operation of the hydraulic pump, which might otherwise happen if the vane was not supported at the end portions of its chamber contact surface, e.g. because the inner contact surface has cavities formed at its outer edges so that the vane is only supported at a middle portion of its chamber contact surface.
Preferably, the inner contact surface is configured to permit both outer end portions of the chamber contact surface to remain in contact with the inner contact surface when the vane slides over the entire inner contact surface.
Such arrangement means that the inner contact surface provides continuous support to both outer end portions of the vane as the vane slides over the entire inner contact surface. In other words, there are no cavities (and thus no non-contact points) present at the outer edges of the inner contact surface. Thus, the stability of the hydraulic pump is improved throughout operation of the hydraulic pump.
The fluid chamber housing includes a sealing portion and the cavity may be positioned outside of the sealing portion.
The cavity being located outside of the sealing portion means that the cavity is not present in the sealing portion and so it does not interfere with operation of the hydraulic pump.
Optionally the cavity is an elongate groove.
The cavity being an elongate groove provides a continuous non-contact portion along the length of the groove, thus maximising the reduction on friction between the vane and the fluid chamber housing.
Optionally the inner contact member includes a plurality of cavities.
Having a plurality of cavities means that the reduction in friction (i.e. due to the non-contact portions provided by the cavities) can be balanced with providing adequate support to the vane (i.e. via the contact surface between the cavities which is in slidable contact with the vane).
Preferred embodiments of the invention will now be described, by way of non-limiting examples, with reference to the accompanying drawings in which: Figure 1 shows a schematic of a hydraulic pump according to the invention; Figure 2 shows a schematic of a cavity of the hydraulic pump according to a first embodiment of the invention; Figure 3 shows a schematic of a cavity of the hydraulic pump according to a second embodiment of the invention; and Figure 4 shows a schematic of a cavity of the hydraulic pump according to a third embodiment of the invention.
A hydraulic pump 10 is shown in Figure 1. The hydraulic pump 10 includes a fluid chamber housing 12 and a rotor assembly 14 located within the fluid chamber housing 12. The fluid chamber housing 12 and the rotor assembly 14 cooperate with one another to define a fluid chamber 16 therebetween.
The rotor assembly 14 includes a rotor 18 and a plurality of vanes 20 extending radially from the rotor 18. The rotor 18 has a plurality of slots 22 to which a respective vane 20 is moveably coupled. Each of the vanes 20 is cooperable with the fluid chamber housing 12 so as to define a corresponding fluid chamber portion 24 that lies between adjacent vanes 20.
The hydraulic pump 10 also includes an inlet 26 and an outlet 28 through which a fluid enters and exits the fluid chamber 16. The rotor assembly 14 is moveable relative to the fluid chamber housing 12 so as to move fluid between the inlet 26 and outlet 28. More specifically, the rotor 18 is rotatable relative to the fluid chamber housing 12, and such rotation permits lateral movement of the vanes 20 outwards (i.e. due to centrifugal force) towards the fluid chamber housing 12. The vanes 20 each have a fluid contact surface 30 which pushes the fluid when the rotor 18 rotates relative to the fluid chamber housing 12. Moreover, the vanes 20 each have a chamber contact surface 32 which slides over an inner contact surface 34 of the fluid chamber housing 12.
The chamber contact surface 32 of each vane 20 and the inner contact surface 34 of the fluid chamber housing 12 therefore define contact portions 36, 36a, 36b where the two surfaces are in sliding contact with one another, as shown more clearly in Figures 2 to 4.
In other embodiments, the fluid chamber housing 12 may be moveable relative to the rotor assembly 14 or both the fluid chamber housing 12 and the rotor assembly 14 may be moveable relative to one another.
The fluid chamber housing 12 includes an outer cam ring 38 whose inner surface defines to the inner contact surface 34 over which the vanes 20 slide.
Figures 2 to 4 show the inner contact surface 34 of the fluid chamber housing 12 as if it has been rolled out flat. The inner contact surface 34 includes a cavity 40', 40", 40"' disposed thereon to define a non-contact portion 42, 42a, 42b between the fluid chamber housing 12 and each vane 20 as the vane 20 passes over the cavity 40', 40", 40"'.
Figure 2 shows the cavity 40' according to a first embodiment of the invention. The inner contact surface 34 includes a single cavity 40' which is located inward from both outer edges 44a, 44b of the inner contact surface 34. Thus, outer end portions 46a, 46b of each chamber contact surface 32 of each vane 20 remain in contact with the inner contact surface 34 as the vane 20 slides over the cavity 40'. Meanwhile, an intermediate portion 48 located between the outer end portions 46a, 46b of each chamber contact surface 32 of each vane 20 has no contact with the inner contact surface 34 as it slides over the cavity 40' (i.e. as it slides over the non-contact portion 42).
Moreover, there are no other cavities present at either outer edge 44a, 44b of the inner contact surface 34 so that the chamber contact surface 32 of each vane 20 remains in contact with the inner contact surface 34 as the vane 20 slides over the entire inner contact surface 34.
The inner contact surface 34 includes a sealing portion 50 which is devoid of any cavities 40' so that the entire length of each chamber contact surface 32, i.e. the outer end portions 46a, 46b and the intermediate portion 48, is in contact with the inner contact surface 34 as vane 20 passes over the sealing portion 50.
In this embodiment, the cavity 40' is an elongate groove. The groove has a substantially rectangular cross-sectional shape, but it may take another shape such as oval. As can be seen, the groove has an area that defines a majority of the inner contact surface 34. Preferably, the groove defines 80% of the inner contact surface 34.
The groove is shallow, for example it may have a depth of around 10pm.
Figure 3 shows the cavity 40" according to a second embodiment of the invention. In this embodiment, the cavity 40" is made up of a plurality of discrete cavity portions 54 each defining a discrete non-contact portion 42a. There are three cavity portions 54 shown, but there may be more or fewer than three.
The cavity portions 54 are spaced from one another to define intermediate contact portions 36a located between the discrete non-contact portions 42a. Each of the cavity portions 54 is located inward from both outer edges 44a, 44b of the inner contact surface 34. Thus, the outer end portions 46a, 46b of each chamber contact surface 32 of each vane 20 remain in contact with the inner contact surface 34 as the vane 20 slides over the cavity portions 54. Meanwhile, the intermediate portion 48 of each chamber contact surface 32 of each vane 20 contacts the inner contact surface 34 at each intermediate contact portion 36a and does not contact the inner contact surface 34 at each discrete non-contact portion 42a as it slides over the cavity portions 54. The vanes 20 are therefore supported at both outer end portions 46a, 46b and at discrete points 36a along the intermediate portion 48.
Moreover, there are no other cavities present at either outer edge 44a, 44b of the inner contact surface 34 so that the chamber contact surface 32 of each vane 20 remains in contact with the inner contact surface 34 as the vane 20 slides over the entire inner contact surface 34.
As before, the inner contact surface 34 includes a sealing portion 50 which is devoid of any cavities 40" so that the entire length of each chamber contact surface 32, i.e. the outer end portions 46a, 46b and the intermediate portion 48, is in contact with the inner contact surface 34 as the vane 20 slides over the sealing portion 50.
Each cavity portion 54 is an elongate groove 56 having a substantially rectangular cross-sectional shape. As can be seen, the overall area defined by the grooves 56 defines a majority of the inner contact surface 34. Preferably, the overall area of the grooves 56 define 80% of the inner contact surface 34.
Figure 4 shows the cavity 40"' according to a third embodiment of the invention. In this embodiment, the cavity 40"' is made up of a plurality of discrete cavity portions 58 each defining a discrete non-contact portion 42b. There are three cavity portions 58 shown, but there may be more or fewer than three.
The cavity portions 58 are spaced from one another to define intermediate contact portions 36b located between the discrete non-contact portions 42b. This time, two of the cavity portions 58 are located at a respective outer edge 44a, 44b of the inner contact surface 34. Thus, a new "outer edge" 44'a, 44'b of the inner contact surface 34 is formed which is to indented from the outermost edge 44a, 44b of the inner contact surface 34. The other cavity portion 58 is located between the new outer edges 44'a, 44'b of the contact surface 34, i.e. it is located between the outer cavity portions 58. Thus, the outer end portions 46a, 46b of each chamber contact surface 32 of each vane 20 are not in contact with the inner contact surface 34 as the vane 20 slides over the cavity portions 58. Instead, the intermediate portion 48 of the chamber contact surface 32 contacts the inner contact surface 34 at each intermediate contact portion 36b as the vane 20 slides over the cavity portions 58. The vanes 20 are therefore supported only at discrete points 36b within the intermediate portion 48 of the chamber contact surface 32 as the vane 20 passes over the cavity 40"'. Thus, the discrete points 36b are located inboard of the outer end portions 46a, 46b of the chamber contact surface 32.
As before, the inner contact surface 34 includes a sealing portion 50 which is devoid of any cavities 40"' so that the entire length of each chamber contact surface 32, i.e. the outer end portions 46a, 46b and the intermediate portion 48, is in contact with the inner contact surface 34 as the vane 20 slides over the sealing portion 50.
Each cavity portion 58 is an elongate groove 56 having a substantially rectangular cross-sectional shape. As can be seen, the overall area defined by the grooves 56 defines a majority of the inner contact surface 34. Preferably, the overall area of the grooves 56 define 80% of the inner contact surface 34.
In use, the hydraulic pump 10 may be connected to a hydraulic control system (not shown) in a motor vehicle. In such an embodiment, the inlet 26 and outlet 28 are connected to downstream equipment, for example equipment associated with the automatic transmission or engine of the motor vehicle.
A fluid, such as oil, enters the fluid chamber housing 12 via the inlet 26. The rotor 18 is rotated and the fluid contact surface 30 of each vane 20 pushes the fluid in the direction of rotation (i.e. anti-clockwise in this embodiment). As the rotor 18 rotates, each vane 20 moves into and out of its associated slot 22 in the rotor 18 so that the chamber contact surface 32 of each vane 20 continually abuts and slides over the inner contact surface 34 of the fluid chamber housing 12. Thus, the vanes 20 urge a respective portion of fluid within each fluid chamber portion 24 from the inlet 26 to the outlet 28.
In the arrangement shown in Figures 2 and 3, as the rotor 18 rotates and the vanes 20 to slide over the inner contact surface 34, the outer end portions 46a, 46b of the chamber contact surface 32 of each vane 20 remain in contact with the inner contact surface 34, i.e. at its outer edges 44a, 44b, throughout the entire rotation of movement.
In the arrangement shown in Figure 2, the intermediate portion 48 of the chamber contact surface 32 of each vane 20 passes over the non-contact portion 42 of the inner contact surface, as defined by the cavity 40'. Thus, there is no friction between the intermediate portion 48 of each chamber contact surface 32 and the inner contact surface 34 as the vane 20 slides over the cavity 40'. Moreover, the chamber contact surface 32 of each vane 20 is supported at both outer end portions 46a, 46b as the vane 20 slides over the cavity 40'.
In the arrangement shown in Figure 3, the intermediate portion 48 of the chamber contact surface 32 of each vane 20 passes over discrete non-contact portions 42a and intermediate contact portions 36a, as defined by the cavity portions 54. Thus, there is no friction between the intermediate portion 48 of each chamber contact surface 32 and the inner contact surface 34 at the non-contact portions 42a as the vane 20 slides over the cavity portions 54. Moreover, the chamber contact surface 32 of each vane 20 is supported at both outer end portions 46a, 46b and at each intermediate contact portion 36a as the vane 20 slides over the cavity portions 54.
In the arrangement shown in Figure 4, the intermediate portion 48 of the chamber contact surface 32 of each vane 20 passes over discrete non-contact portions 42b and discrete contact portions 36b as defined by the cavity portions 54. This time, the discrete contact portions 36b are located inboard from the outermost edges 44a, 44b of the inner contact surface 34. Thus, there is no friction between the outer end portions 46a, 46b of the chamber contact surface 32 of each vane 20 and the inner contact surface 34. Moreover, there is no friction between the intermediate portion 48 of each chamber contact surface 32 and the inner contact surface 34 at the non-contact portion 42b defined by the middle cavity portion 58.
In each of the embodiments shown in Figures 2 to 4, the entire length of each chamber contact surface 32, i.e. the outer end portions 46a, 46b and the intermediate portion 48, contacts the inner contact surface 34 as the vane 20 slides over the sealing portion 50. The sealing portion 50 therefore traps the given volume of oil so it can be transported between the inlet and outlet.
The cavity 40', 40", 40"' may be formed in the fluid chamber housing 12 by machining, casting, sintered or 3D printing, or other methods such as corrosion or etching etc.

Claims (6)

  1. CLAIMS: 1. A hydraulic pump comprising a fluid chamber housing and a rotor assembly, the fluid chamber housing and rotor assembly cooperating with one another to define a fluid chamber therebetween, the fluid chamber housing and the rotor assembly being moveable relative to one another to move fluid in the fluid chamber along an inner contact surface of the fluid chamber housing from an inlet to an outlet of the hydraulic pump, the rotor assembly including a vane configured to push the fluid via a fluid contact surface of the vane when the rotor assembly and fluid chamber housing are moving relative to one another, the vane further including a chamber contact surface configured to slide over the inner contact surface of the fluid chamber housing when the rotor assembly and fluid chamber housing are moving relative to one another, the inner contact surface including a cavity disposed thereon defining a non-contact portion between the fluid chamber housing and the vane, wherein the cavity is located between adjacent outer edges of the inner contact surface.
  2. 2. A hydraulic pump according to Claim 1 wherein the inner contact surface is configured to permit both outer end portions of the chamber contact surface to remain in contact with the inner contact surface when the vane slides over the cavity.
  3. 3. A hydraulic pump according to Claim 1 or Claim 2 wherein the inner contact surface is configured to permit both outer end portions of the chamber contact surface to remain in contact with the inner contact surface when the vane slides over the entire inner contact surface.
  4. 4. A hydraulic pump according to any preceding claim wherein the fluid chamber housing includes a sealing portion, the cavity being positioned outside of the sealing portion.
  5. 5. A hydraulic pump according to any preceding claim wherein the cavity is an elongate groove.
  6. 6. A hydraulic pump according to any preceding claim wherein the inner contact surface includes a plurality of cavities.
GB1905524.3A 2019-04-18 2019-04-18 A hydraulic pump Withdrawn GB2583128A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB1905524.3A GB2583128A (en) 2019-04-18 2019-04-18 A hydraulic pump
CN201910777784.1A CN111173739B (en) 2019-04-18 2019-08-22 Hydraulic pump

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1905524.3A GB2583128A (en) 2019-04-18 2019-04-18 A hydraulic pump

Publications (2)

Publication Number Publication Date
GB201905524D0 GB201905524D0 (en) 2019-06-05
GB2583128A true GB2583128A (en) 2020-10-21

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Family Applications (1)

Application Number Title Priority Date Filing Date
GB1905524.3A Withdrawn GB2583128A (en) 2019-04-18 2019-04-18 A hydraulic pump

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CN (1) CN111173739B (en)
GB (1) GB2583128A (en)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4073608A (en) * 1975-04-02 1978-02-14 Christy Charles A Positive displacement vane type rotary pump
US4123205A (en) * 1976-01-15 1978-10-31 Wibau Rotary vane pump with sealing means
JP2008223631A (en) * 2007-03-13 2008-09-25 Matsushita Electric Works Ltd Vane pump
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