A gear oil pump

Abstract

The utility model relates to the technical field of oil pumps, and in particular to a gear oil pump, which includes an intermediate housing with an inner cavity, a driving gear arranged in the inner cavity, a driven gear arranged in the inner cavity and meshing with the driving gear, a front housing connected to the front end of the intermediate housing, and a rear housing connected to the rear end of the intermediate housing, wherein the intermediate housing is also provided with an oil inlet and an oil outlet, wherein both the driving gear and the driven gear are helical gears, and a sealing groove is provided on at least one of the opposing surfaces of the intermediate housing and the front housing, and a sealing groove is provided on at least one of the opposing surfaces of the intermediate housing and the rear housing, and a sealing ring is provided in each sealing groove. When the gear oil pump of the utility model is in use, the opposing surfaces of the intermediate housing and the front housing and the opposing surfaces of the intermediate housing and the rear housing are sealed by sealing rings to prevent lubricating oil from leaking along the gap between the opposing surfaces of the intermediate housing and the front housing and the gap between the opposing surfaces of the intermediate housing and the rear housing.

Description

Technical Field

[0001] The utility model relates to the technical field of oil pumps, in particular to a gear oil pump. Background Art

[0002] Gear oil pumps generally consist of three parts, such as Figure 1 As shown, the three parts are the front housing 16, the middle housing 18 and the rear housing 17. The housings are connected by bolts, and the joint surfaces are coated with sealant. When the gear oil pump occasionally has high pressure during use, the lubricating oil will leak from the connection interface; a set of spur gears are installed inside the middle housing, such as Figure 2 As shown, the spur gear includes a driving gear 19 and a driven gear 20 meshing together. The motor drives the driving gear 19 to rotate, and the driving gear 19 and the driven gear 20 mesh and rotate to transport the lubricating oil from the low-pressure area to the high-pressure area. The transmission stability of the spur gear mechanism is poor, and it is easy to produce large impacts, vibrations and noises, and the phenomenon of teeth jamming and hitting occurs. Utility Model Content

[0003] The utility model provides a gear oil pump to solve the technical problem of easy oil leakage on the connection surfaces between various parts of the gear oil pump in the prior art.

[0004] In order to solve the above problems, the utility model provides a gear oil pump adopting the following technical solutions:

[0005] A gear oil pump comprises an intermediate housing with an inner cavity, a driving gear arranged in the inner cavity, a driven gear arranged in the inner cavity and meshing with the driving gear, a front housing connected to the front end of the intermediate housing and a rear housing connected to the rear end of the intermediate housing, the intermediate housing is also provided with an oil inlet and an oil outlet, the driving gear and the driven gear are both helical gears, a sealing groove is provided on at least one of the surfaces facing the intermediate housing and the front housing, a sealing groove is provided on at least one of the surfaces facing the intermediate housing and the rear housing, and a sealing ring is provided in each sealing groove.

[0006] The beneficial effects are as follows: when the gear oil pump of the utility model is in use, the sealing ring is used to seal the opposing surfaces of the intermediate housing and the front housing and the opposing surfaces of the intermediate housing and the rear housing, so as to prevent the lubricating oil from leaking along the gap between the opposing surfaces of the intermediate housing and the front housing and the gap between the opposing surfaces of the intermediate housing and the rear housing; the helical gear increases the contact area between the teeth of the active gear and the passive gear, and the helical gear adopts a progressive meshing method, which can effectively reduce noise during operation, reduce vibration, avoid jamming, and reduce the failure rate.

[0007] Furthermore, both end faces of the intermediate housing along the axis direction of the driving gear are provided with intermediate sealing grooves, a front sealing groove corresponding to the intermediate sealing groove is provided on the end face of the front housing opposite to the intermediate housing, and a rear sealing groove corresponding to the intermediate sealing groove is provided on the end face of the rear housing opposite to the intermediate housing; sealing rings are provided between the front sealing groove and the corresponding intermediate sealing groove, and between the rear sealing groove and the corresponding intermediate sealing groove.

[0008] Beneficial effects: simple structure, convenient installation of sealing ring.

[0009] Furthermore, the middle sealing groove is communicated with the inner cavity.

[0010] Beneficial effect: Lubricating oil is prevented from entering the gap between the opposing surfaces of the intermediate housing and the front housing, and the gap between the intermediate housing and the rear housing, thereby reducing the waste of lubricating oil.

[0011] Furthermore, the intermediate shell is provided with a plurality of intermediate connecting holes which penetrate the intermediate shell along the axis direction of the driving gear; the front shell is provided with a plurality of front connecting holes which correspond one-to-one to the intermediate connecting holes and penetrate the front shell; the rear shell is provided with a plurality of rear connecting holes which correspond one-to-one to the intermediate connecting holes and penetrate the rear shell, and the intermediate connecting holes and the corresponding front connecting holes and rear connecting holes are connected by connecting bolts.

[0012] Beneficial effects: simple structure, easy installation and connection, reducing the number of bolts used, and facilitating the installation and removal of the sealing ring, so as to facilitate the maintenance of the sealing ring, while enabling the front shell and the rear shell to clamp the middle shell to compress the rubber sealing ring, thereby ensuring the sealing effect.

[0013] Furthermore, the oil inlet and the oil outlet are both provided with internal threads, and the oil inlet and the oil outlet are both threadedly connected with NPT threaded joints, and the end of the NPT threaded joint away from the inner cavity is used for connecting with the oil pipe.

[0014] Beneficial effect: NPT threaded joint has good sealing effect, which can prevent oil leakage along the connection between the oil pipe and the inner cavity. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] By reading the detailed description below with reference to the accompanying drawings, the above and other purposes, features and advantages of the exemplary embodiments of the present invention will become easy to understand. In the accompanying drawings, several embodiments of the present invention are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0016] Figure 1 It is a structural schematic diagram of a gear oil pump in the prior art;

[0017] Figure 2It is a cross-sectional view of a gear oil pump in the prior art;

[0018] Figure 3 This is a schematic diagram of the structure of a gear oil pump of the utility model;

[0019] Figure 4 This is a schematic diagram of the structure of a gear oil pump of the utility model;

[0020] Figure 5 It is a cross-sectional view of a gear oil pump of the utility model;

[0021] Figure 6 for Figure 5 The enlarged schematic diagram at A in the middle;

[0022] Figure 7 It is a front view of an intermediate housing of a gear oil pump of the utility model.

[0023] Description of reference numerals:

[0024] 1. Intermediate housing; 2. Driving gear; 3. Passive gear; 4. Inner cavity; 5. Front housing; 6. Rear housing; 7. Oil inlet; 8. Oil outlet; 9. Sealing ring; 10. Intermediate sealing groove; 11. Front sealing groove; 12. Intermediate connecting hole; 13. Front connecting hole; 14. Rear connecting hole; 15. Rotating shaft; 16. Front housing; 17. Rear housing; 18. Intermediate housing; 19. Driving gear; 20. Passive gear. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Those skilled in the art should know that the embodiments described below are part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0026] Any number of elements in the drawings is for illustration and not limitation, and any naming is for distinction only and does not have any limiting meaning.

[0027] The principle and spirit of the present invention are explained in detail below with reference to several representative embodiments of the present invention.

[0028] Embodiment 1 of a gear oil pump provided by the utility model:

[0029] like Figures 3 to 7 As shown, a gear oil pump of the utility model comprises an intermediate housing 1 , a front housing 5 and a rear housing 6 .

[0030] like Figure 3 and Figure 4 As shown, the interior of the intermediate housing 1 has an inner cavity 4 and both the front and rear ends are provided with openings communicating with the inner cavity 4. A driving gear 2 and a passive gear 3 meshing with the driving gear 2 are rotatably assembled in the inner cavity 4. The driving gear 2 is coaxially connected with a rotating shaft 15, and the rotating shaft 15 is used to connect with the output shaft of the motor, thereby driving the driving gear 2 to rotate. In order to reduce the noise generated when the driving gear 2 and the passive gear 3 are meshed, the driving gear 2 and the passive gear 3 are both helical gears. The meshing of the helical gears can increase the contact area between the teeth of the driving gear 2 and the passive gear 3, and the helical gears adopt a progressive meshing method, which can effectively reduce the noise during operation, reduce vibration, avoid the occurrence of jamming, and reduce the failure rate.

[0031] like Figure 7 As shown, the end surfaces of the front and rear ends of the intermediate housing 1 are also provided with intermediate sealing grooves 10, which extend to the inner wall of the inner cavity 4 and are connected to the inner cavity 4. The intermediate housing 1 is provided with a plurality of intermediate connecting holes 12 extending in the front-to-back direction, each of which is disposed outside the intermediate sealing groove 10 and penetrates the intermediate housing 1 in the front-to-back direction.

[0032] An oil inlet 7 is provided on the left side of the intermediate shell 1, and an oil outlet 8 is provided on the right side of the intermediate shell 1. Both the oil inlet 7 and the oil outlet 8 are connected to the inner cavity 4 and are provided with internal threads. Both the oil inlet 7 and the oil outlet 8 are threadedly connected with NPT threaded joints, and the end of the NPT threaded joint away from the inner cavity 4 is used for connection with the oil pipe.

[0033] like Figure 5 and Figure 6 As shown, a front sealing groove 11 corresponding to the middle sealing groove 10 is provided on the end surface of the front housing 5 opposite to the middle housing 1, and the front sealing groove 11 and the corresponding middle sealing groove 10 form a front sealing cavity, and a sealing ring 9 is provided in the front sealing cavity to seal the gap between the front housing 5 and the middle housing 1. The front housing 5 is also provided with a plurality of front connecting holes corresponding to the middle connecting holes 12 one by one and penetrating the front housing 5.

[0034] A rear sealing groove corresponding to the middle sealing groove 10 is formed on the end surface of the rear housing 6 opposite to the middle housing 1, and the rear sealing groove and the corresponding middle sealing groove 10 form a rear sealing cavity, and a sealing ring 9 is provided in the rear sealing cavity to seal the gap between the rear housing 6 and the middle housing 1. The rear housing 6 is also provided with a plurality of rear connection holes 13 corresponding to the middle connection holes 12 one by one and penetrating the rear housing 6. Front connection holes; 14.

[0035] In this embodiment, the middle connection hole 12, the front connection hole and the rear connection hole 13. The front connection hole; 14 are all threaded holes, and the middle connection hole 12 and the corresponding front connection hole and the rear connection hole 13. The front connection hole; 14 are threadedly connected together by bolts.

[0036] In this embodiment, to ensure the sealing effect between the intermediate shell 1 and the front shell 5 and the rear shell 6, sealant is applied to the end surface opposite to the intermediate shell 1 and the front shell 5 and the end surface opposite to the intermediate shell 1 and the rear shell 6.

[0037] In this embodiment, the sealing ring 9 is a rubber sealing ring.

[0038] When a gear oil pump of the utility model is used, firstly, sealant is applied on the opposite sides of the intermediate housing 1 and the front housing 5, and the opposite sides of the intermediate housing 1 and the rear housing 6, and then the driving gear 2 and the driven gear 3 are arranged in the inner cavity 4, and the sealing ring 9 is arranged in the middle sealing groove 10, at this time, the front housing 5 and the rear housing 6 are both tightly attached to the intermediate housing 1, and then the intermediate housing 1 and the front housing 5, and the intermediate housing 1 and the rear housing 6 are connected together by bolts, and then the NPT threaded joint is threadedly connected at the oil outlet 8 and the oil inlet 7, and finally the oil pipe is connected to the NPT threaded joint.

[0039] When the gear oil pump of the utility model is in use, the intermediate housing and the opposite surfaces of the front housing and the intermediate housing and the opposite surfaces of the rear housing are sealed by a sealing ring to prevent lubricating oil from leaking along the gap between the intermediate housing and the opposite surfaces of the front housing and the gap between the intermediate housing and the opposite surfaces of the rear housing.

[0040] Embodiment 2 of a gear oil pump provided by the utility model:

[0041] The main difference between it and Example 1 is that in Example 1, the middle sealing groove is connected to the inner cavity.

[0042] In this embodiment, the middle sealing groove is not connected to the inner cavity.

[0043] Embodiment 3 of a gear oil pump provided by the utility model:

[0044] The main difference between the embodiment 1 and the first embodiment is that in the first embodiment, sealant is applied to the end surface of the intermediate shell and the front shell opposite to each other, and the end surface of the intermediate shell and the rear shell opposite to each other.

[0045] In this embodiment, no sealant is applied to the end surface of the intermediate housing and the front housing opposite to each other, and no sealant is applied to the end surface of the intermediate housing and the rear housing opposite to each other.

[0046] According to the above description of this specification, those skilled in the art may also understand that the terms used below, such as "front", "rear", "left", "right", "inside", "outside" and other terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings of this specification, which are only for the purpose of facilitating the explanation of the scheme of the utility model and simplifying the description, rather than explicitly or implicitly indicating that the device or element involved must have the specific orientation, be constructed and operate in a specific orientation. Therefore, the above-mentioned orientation or positional relationship terms cannot be understood or interpreted as limitations on the scheme of the utility model.

[0047] In addition, in the description of this specification, “plurality” means at least two, for example, two, three or more, etc., unless otherwise clearly and specifically defined.

Claims

1. A gear oil pump, comprising an intermediate housing with an inner cavity, a driving gear disposed in the inner cavity, a driven gear disposed in the inner cavity and meshing with the driving gear, a front housing connected to the front end of the intermediate housing, and a rear housing connected to the rear end of the intermediate housing, wherein the intermediate housing is also provided with an oil inlet and an oil outlet, characterized in that: The driving gear and the driven gear are both helical gears, a sealing groove is provided on at least one of the opposing surfaces of the intermediate housing and the front housing, and a sealing groove is provided on at least one of the opposing surfaces of the intermediate housing and the rear housing, and a sealing ring is provided in each sealing groove.

2. A gear oil pump according to claim 1, characterized in that: The two end faces of the intermediate housing along the axis direction of the driving gear are both provided with intermediate sealing grooves, the end face of the front housing opposite to the intermediate housing is provided with a front sealing groove corresponding to the intermediate sealing groove, and the end face of the rear housing opposite to the intermediate housing is provided with a rear sealing groove corresponding to the intermediate sealing groove; sealing rings are provided between the front sealing groove and the corresponding intermediate sealing groove, and between the rear sealing groove and the corresponding intermediate sealing groove.

3. A gear oil pump according to claim 2, characterized in that: The middle sealing groove is communicated with the inner cavity.

4. A gear oil pump according to claim 3, characterized in that: The intermediate housing is provided with a plurality of intermediate connecting holes penetrating the intermediate housing along the axis direction of the driving gear; the front housing is provided with a plurality of front connecting holes corresponding one-to-one to the intermediate connecting holes and penetrating the front housing; the rear housing is provided with a plurality of rear connecting holes corresponding one-to-one to the intermediate connecting holes and penetrating the rear housing, and the intermediate connecting holes and the corresponding front connecting holes and rear connecting holes are connected by connecting bolts.

5. A gear oil pump according to any one of claims 1 to 4, characterized in that: The oil inlet and the oil outlet are both provided with internal threads, and the oil inlet and the oil outlet are both threadedly connected with NPT threaded joints, and the end of the NPT threaded joint away from the inner cavity is used for connecting with the oil pipe.

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