Internal gear pump and vehicle

Abstract

The utility model discloses an internal gear pump and a vehicle, the internal gear pump comprises a casing, a gear assembly arranged in the casing and sealing plates arranged on the two sides of the gear assembly, sealing rings are arranged between the sealing plates and the casing, the casing is provided with sealing grooves corresponding to the sealing rings, and the sealing grooves correspond to the sealing rings. At least part of the sealing ring is installed in the sealing groove, at least one of the inner groove face of the sealing groove and the inner circumferential face of the sealing ring is provided with a flow guide groove, and the flow guide groove is communicated with an oil liquid channel in the machine shell. According to the internal gear pump disclosed by the embodiment of the utility model, oil liquid in the shell flows into the flow guide groove, and force is applied to the sealing ring by the oil liquid, so that the tightness of matching of the sealing ring and the sealing groove and contact of the sealing plate is improved, and the sealing performance is further improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to hydraulic transmission equipment technical field especially relates to a kind of internal meshing gear pump and vehicle. BACKGROUND

[0002] Internal meshing gear pump is widely used in vehicle hydraulic system (such as steering assist, transmission hydraulic control and lubrication system) due to its compact structure, output stable, low noise and other characteristics. With the demand of vehicle lightening and high pressure, the working pressure and speed range of such pump are significantly improved, and higher requirements are put forward for the sealing reliability of key components.

[0003] In the related art, the sealing between the sealing plate on both sides of the gear and the pump body / pump cover leaks more prominently. Specifically, the sealing between the sealing plate and the pump body / pump cover only relies on the compression spring of the sealing ring. In actual operation, the sealing performance of the sealing ring decreases due to the decrease in compression amount caused by the long-term wear and temperature change of the sealing plate, resulting in oil leakage and reduced volumetric efficiency. SUMMARY

[0004] The utility model aims at at least one of the technical problems in the related art.

[0005] To this end, the embodiment of the utility model provides an internal meshing gear pump to solve the problem of sealing performance in the related art.

[0006] The embodiment of the utility model also provides a vehicle.

[0007] The internal meshing gear pump of the embodiment of the utility model comprises a casing, a gear assembly arranged in the casing, and a sealing plate arranged on both sides of the gear assembly. A sealing ring is arranged between the sealing plate and the casing. A sealing groove corresponding to the sealing ring is arranged on the casing. At least part of the sealing ring is arranged in the sealing groove. At least one of the inner groove surface of the sealing groove and the inner circumferential surface of the sealing ring is provided with a flow guide groove. The flow guide groove is in communication with the oil passage in the casing.

[0008] In the internal meshing gear pump of the embodiment of the utility model, the oil in the casing flows into the flow guide groove, and the force of the oil applied to the sealing ring is increased, thereby improving the tightness of the sealing ring and the sealing groove and the sealing plate, and further improving the sealing performance.

[0009] In some embodiments, the flow guide groove has a plurality of flow guide grooves, and the plurality of flow guide grooves are arranged at equal intervals along the path of the sealing groove.

[0010] In some embodiments, the flow guide groove has a plurality of flow guide grooves, and the number of flow guide grooves in the high-pressure area of the sealing groove is greater than the number of flow guide grooves in the low-pressure area.

[0011] In some embodiments, the sealing ring comprises a first segment and a second segment arranged along an axial direction of the casing, an inner contour size of the first segment is greater than an inner contour size of the second segment, an end surface of the first segment away from the second segment abuts against a groove bottom surface of the sealing groove, an end surface of the second segment away from the first segment abuts against a back surface of the sealing plate, and an inner circumferential surface of the second segment abuts against an inner groove surface of the sealing groove.

[0012] In some embodiments, an outer contour size of the first segment is the same as an outer contour size of the second segment, and an outer circumferential surface of the sealing ring abuts against an outer groove surface of the sealing groove.

[0013] In some embodiments, the inner groove surface of the sealing groove is provided with the flow guide groove, and a length of the flow guide groove is the same as a depth of the sealing groove.

[0014] In some embodiments, the inner circumferential surface of the second segment of the sealing ring is provided with the flow guide groove, and a length of the flow guide groove is the same as an axial length of the second segment of the sealing ring.

[0015] In some embodiments, the sealing ring comprises a first sealing ring and a second sealing ring, and the first sealing ring and the second sealing ring are mirror arranged with a center axis of the casing as a symmetric axis.

[0016] In some embodiments, the sealing ring is in a shape of a crescent.

[0017] The vehicle of the embodiment of the utility model comprises the internal gear pump in any one of the above embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is the explosion schematic view of the internal gear pump of the embodiment of the utility model.

[0019] Figure 2 is the schematic view of the sealing groove and the flow guide groove of the embodiment of the utility model.

[0020] Figure 3 is the structural schematic view of the sealing ring of the embodiment of the utility model.

[0021] Figure 4 is the sectional view schematic view of part structure of the embodiment of the utility model.

[0022] Figure 5 is Figure 4 is the enlarged schematic view of part A (the schematic view of the flow guide groove arranged on the inner groove surface of the sealing groove).

[0023] Figure 6 is the schematic view of the flow guide groove arranged on the inner circumferential surface of the sealing ring.

[0024] Figure 7 This is a schematic diagram showing that the guide channel is simultaneously located on the inner surface of the sealing groove and the inner circumferential surface of the sealing ring.

[0025] Figure label:

[0026] 1-Housing, 11-Pump body, 12-Pump cover, 101-Sealing groove, 102-Guide groove, 2-Gear assembly, 3-Sealing plate, 4-Sealing ring, 41-First section, 42-Second section, 401-First sealing ring, 402-Second sealing ring. Detailed Implementation

[0027] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0028] The internal gear pump of this utility model embodiment is described below with reference to the accompanying drawings.

[0029] like Figures 1 to 7 As shown, the internal gear pump of this utility model embodiment includes a housing 1, a gear assembly 2 disposed inside the housing 1, and sealing plates 3 disposed on both sides of the gear assembly 2.

[0030] The housing 1 includes a detachably connected pump body 11 and pump cover 12. The detachable design facilitates assembly and maintenance. A sealing ring 4 is provided between the sealing plate 3 on one side of the gear assembly 2 and the pump body 11, and between the sealing plate 3 on the other side of the gear assembly 2 and the pump cover 12. The pump body 11 and the pump cover 12 are respectively provided with sealing grooves 101 corresponding to the sealing rings 4. At least a portion of the sealing rings 4 is installed in the sealing grooves 101.

[0031] The sealing plates 3 on both sides are used to seal the gear cavity and directly bear the oil pressure. They need to be tightly fitted with the gear assembly 2. The sealing ring 4 is arranged between the sealing plate 3 and the pump body 11 / pump cover 12 to prevent oil from flowing out from the gap between the sealing plate 3 and the housing 1.

[0032] At least one of the inner groove surface of the sealing groove 101 and the inner circumferential surface of the sealing ring 4 is provided with a guide groove 102, which communicates with the oil passage inside the housing 1 to form a pressure transmission path. It should be noted that the sealing structure (sealing ring 4, sealing groove 101 and guide groove 102) on one side of the pump body 11 is the same as the sealing structure on one side of the pump cover 12.

[0033] Understandably, the oil enters the back area of ​​the sealing ring 4 through the guide groove 102, creating back pressure. This back pressure acts on the inner circumferential surface of the sealing ring 4, generating an outward expanding force that forces the sealing ring 4 to simultaneously press against the wall of the sealing groove 101 and the end face of the sealing plate 3. This compensates for the decrease in the initial interference fit of the sealing ring 4 caused by assembly errors or wear.

[0034] When the oil pressure fluctuates, the back pressure adjusts the sealing contact force in real time to avoid high pressure leakage or low pressure air suction. For example, under high pressure working condition, the guide groove 102 transmits higher back pressure to prevent the sealing ring 4 from being crushed by oil pressure. Under low pressure or vacuum working condition, the back pressure maintains minimum contact force to prevent the sealing ring 4 from being separated.

[0035] Therefore, the internal gear pump of the embodiment of the utility model guides the oil pressure inside the gear cavity to the back of the sealing ring 4, actively extrudes the sealing ring 4 by using the oil pressure, makes it tightly adhere to the sealing groove 101 and the sealing plate 3, and the elastic force and the hydraulic back pressure synergistically act to significantly improve the sealing contact pressure. When the system pressure rises, the oil pressure in the guide groove 102 synchronously strengthens, real-time increases the sealing contact pressure, and offsets the deformation of the sealing ring 4 caused by high pressure.

[0036] Optionally, as shown in the figure, the sealing ring 4 comprises a first section 41 and a second section 42 arranged along the axial direction of the casing 1. The inner contour size of the first section 41 is larger than that of the second section 42, that is, the inner side of the sealing ring 4 is stepped. Figures 2 to 7 The end face of the first section 41 away from the second section 42 abuts against the groove bottom face of the sealing groove 101, the end face of the second section 42 away from the first section 41 abuts against the back face of the sealing plate 3, and the inner peripheral surface of the second section 42 abuts against the inner groove surface of the sealing groove 101. The outer contour size of the first section 41 is the same as that of the second section 42, and the outer peripheral surface of the sealing ring 4 abuts against the outer groove surface of the sealing groove 101.

[0037] Through the oil liquid of the guide groove 102, the axial force extrudes the stepped surface of the sealing ring 4 and is transmitted to the back face of the sealing plate 3 to form axial sealing; the radial force extrudes the inner peripheral surface of the first section 41 and is transmitted to the outer groove surface of the sealing groove 101 to form radial sealing. Through the structural design of the sealing ring 4, the sealing performance is further improved.

[0038] Optionally, as shown in the figure, the guide groove 102 can be arranged on the casing 1 (the inner groove surface of the sealing groove 101) or on the sealing ring 4.

[0039] Figures 4 to 7 For example, as shown in the figure, only the inner groove surface of the sealing groove 101 is provided with the guide groove 102, and the length of the guide groove 102 is the same as the depth of the sealing groove 101. Alternatively, as shown in the figure, only the inner peripheral surface of the second section 42 of the sealing ring 4 is provided with the guide groove 102, and the length of the guide groove 102 is the same as the axial length of the second section 42 of the sealing ring 4. Alternatively, as shown in the figure, the inner groove surface of the sealing groove 101 and the inner peripheral surface of the second section 42 of the sealing ring 4 are simultaneously provided with the guide groove 102.

[0040] For example, as shown in the figure, only the inner groove surface of the sealing groove 101 is provided with the guide groove 102, and the length of the guide groove 102 is the same as the depth of the sealing groove 101. Alternatively, as shown in the figure, only the inner peripheral surface of the second section 42 of the sealing ring 4 is provided with the guide groove 102, and the length of the guide groove 102 is the same as the axial length of the second section 42 of the sealing ring 4. Alternatively, as shown in the figure, the inner groove surface of the sealing groove 101 and the inner peripheral surface of the second section 42 of the sealing ring 4 are simultaneously provided with the guide groove 102. Figure 5 Figure 6 For example, as shown in the figure, only the inner groove surface of the sealing groove 101 is provided with the guide groove 102, and the length of the guide groove 102 is the same as the depth of the sealing groove 101. Alternatively, as shown in the figure, only the inner peripheral surface of the second section 42 of the sealing ring 4 is provided with the guide groove 102, and the length of the guide groove 102 is the same as the axial length of the second section 42 of the sealing ring 4. Alternatively, as shown in the figure, the inner groove surface of the sealing groove 101 and the inner peripheral surface of the second section 42 of the sealing ring 4 are simultaneously provided with the guide groove 102. Figure 7 ​​​

[0041] In some embodiments, as shown in Figure 2 The flow guide groove 102 has multiple, multiple flow guide grooves 102 are arranged at equal intervals along the path of the sealing groove 101.

[0042] It can be understood that multiple flow guide grooves 102 are arranged at equal intervals on the path of the sealing groove 101 to form a distributed pressure transmission channel. The flow guide grooves 102 are equally spaced to ensure uniform distribution of oil pressure and avoid local pressure concentration or loss.

[0043] In other embodiments, the flow guide groove 102 has multiple, the number of flow guide grooves 102 in the high-pressure area of the sealing groove 101 is greater than the number of flow guide grooves 102 in the low-pressure area.

[0044] It can be understood that the non-uniform flow guide groove 102 is distributed, and more flow guide grooves 102 are arranged in the high-pressure area (such as near the oil port) of the sealing groove 101, and the number of flow guide grooves 102 in the low-pressure area (such as away from the oil port) is less, forming a pressure gradient adapted flow guide groove 102 density distribution. The number of flow guide grooves 102 in the high-pressure area is increased, so that more high-pressure oil enters the back of the sealing ring 4, generating a stronger hydraulic thrust, significantly improving the sealing contact pressure in the high-pressure area. The oil pressure in the low-pressure area is low, and reducing the number of flow guide grooves 102 can reduce the processing cost, while avoiding the weakening of the strength of the sealing groove 101 caused by redundant design.

[0045] Thus, the density of the flow guide groove 102 is dynamically configured according to the pressure level of the sealing area, and the resource allocation is optimized. The back pressure is concentrated in the high-pressure area with the highest leakage risk to improve the reliability under critical working conditions. Reducing the number of redundant flow guide grooves 102 in the low-pressure area reduces the energy loss caused by the circulation of invalid oil.

[0046] In some embodiments, as shown in Figure 1 The sealing ring 4 includes a first sealing ring 401 and a second sealing ring 402, and the first sealing ring 401 and the second sealing ring 402 are mirror images arranged with the center axis of the casing 1 as the symmetry axis, and the two have consistent structure sizes but clear functional partitions, and can be applicable to bidirectional pumps.

[0047] Further, as shown in Figure 3 The sealing ring 4 is crescent-shaped or waist-shaped. The wide end resists high pressure, and the narrow end prevents negative pressure, covering the sealing requirements in the full pressure range.

[0048] The vehicle of the embodiment of the utility model comprises the internal gear pump in any one of the above embodiments.

[0049] In the description of the utility model, it is understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like is the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.

[0050] In addition, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the utility model, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0051] In the utility model, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected or in communication with each other; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the internal communication or interaction relationship of two elements, unless otherwise specifically limited. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0052] In the utility model, unless otherwise specifically defined and limited, the first feature "on" or "under" the second feature can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "above" and "above" of the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" of the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0053] In the present application, the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" mean that the specific feature, structure, material or characteristic being described with reference to the embodiment or example is included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, the person skilled in the art can combine and combine the features of different embodiments or examples described in the specification and the features of different embodiments or examples without contradiction.

[0054] Although the above embodiments have been shown and described, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application, and the changes, modifications, replacements and modifications of the above embodiments made by the person skilled in the art are within the protection scope of the present application.

Claims

1. An internal gear pump characterized by, The sealing ring is arranged in the sealing groove, and at least one of an inner groove surface of the sealing groove and an inner circumferential surface of the sealing ring is provided with a flow guide groove in communication with an oil passage in the casing.

2. The internal gear pump of claim 1, wherein, The flow guide grooves are arranged at equal intervals along a path of the sealing groove.

3. The internal gear pump of claim 1, wherein, The flow guide grooves are arranged at equal intervals along a path of the sealing groove.

4. The internal gear pump of any one of claims 1-3, wherein, The sealing ring comprises a first segment and a second segment arranged along an axial direction of the casing, an inner contour size of the first segment is greater than that of the second segment, an end surface of the first segment away from the second segment is in abutment with a groove bottom surface of the sealing groove, an end surface of the second segment away from the first segment is in abutment with a back surface of the sealing plate, and an inner circumferential surface of the second segment is in abutment with an inner groove surface of the sealing groove.

5. The internal gear pump of claim 4, wherein, The outer contour size of the first segment is the same as that of the second segment, and an outer circumferential surface of the sealing ring is in abutment with an outer groove surface of the sealing groove.

6. The internal gear pump of claim 4, wherein, The flow guide groove is arranged on the inner groove surface of the sealing groove, and a length of the flow guide groove is the same as a depth of the sealing groove.

7. The internal gear pump of claim 4 wherein, The flow guide groove is arranged on the inner circumferential surface of the second segment of the sealing ring, and a length of the flow guide groove is the same as an axial length of the second segment of the sealing ring.

8. The internal gear pump of claim 1, wherein, The sealing ring comprises a first sealing ring and a second sealing ring, and the first sealing ring and the second sealing ring are arranged in mirror image with a central axis of the casing as a symmetric axis.

9. The internal gear pump of claim 1, wherein, The sealing ring is in a shape of a crescent.

10. A vehicle characterized by comprising: The internal gear pump comprises the internal gear pump according to any one of claims 1-9.

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