CN212869308U - Oil pump cover capable of avoiding gap leakage of pump cover shaft hole - Google Patents

Abstract

The utility model provides a can avoid oil pump cover of pump cover shaft hole clearance leakage, including the pump cover main part, the pump cover main part includes the shaft hole, the low-pressure area faying face that corresponds with pump body oil inlet and the high-pressure area faying face that corresponds with pump body oil-out, low-pressure area faying face and high-pressure area faying face are with on a terminal surface, the low-pressure area faying face is equipped with first off-load groove, the high-pressure area faying face is equipped with second off-load groove, the shaft hole is the blind hole, be equipped with the inclined hole between shaft hole and the first off-load groove, be equipped with the spread groove between shaft hole and the second off-load groove, the shaft hole is linked together through the inclined hole with first off-load groove, the opening direction in shaft hole and first off-load groove and second off. The utility model discloses not only can effectively avoid pump cover shaft hole clearance to leak, improve the volumetric efficiency of oil pump, can also guarantee better lubricated effect.

Description

Oil pump cover capable of avoiding gap leakage of pump cover shaft hole

Technical Field

The utility model relates to an oil pump cover technical field especially relates to an oil pump cover that can avoid pump cover shaft hole clearance to leak.

Background

The volumetric efficiency of the oil pump is a very key performance index, and the higher the volumetric efficiency of the pump is, the smaller the engine power consumed by the pump is, the higher the fuel economy is and the lower the discharge amount is under the same condition.

The loss of volumetric efficiency in the oil pump is generally dominated by internal leakage, which mainly has the influence factors of end face clearance leakage, tooth crest clearance leakage, shaft hole clearance leakage and the like. Shaft hole clearance leaks generally including pump body shaft hole clearance and pump cover shaft hole clearance, the shaft hole is the kinematic pair, need bear the high load of assaulting of high rotational speed, it lubricates to need guide lubricating oil, general shaft hole is the through-hole, the high nip of pump is connected to one end, the air is connected to one end, because pressure differential between the two for the oil stream of high nip plays the purpose in lubricated shaft hole to the low-pressure zone, such structure must lead to the leakage that oil can appear in shaft hole and the communicating one end of air.

The leakage amount of the shaft hole can be reduced by reducing the clearance value between the shaft and the shaft hole in general, but the smaller the clearance value is, the higher the required machining precision is, the cost is inevitably increased, and the optimal oil film thickness between the shaft hole and the shaft surface can not be formed due to too small clearance, so that the lubricating condition of the shaft can be directly influenced, and the eccentric wear failure of the shaft hole is caused. Therefore, how to solve the problem of the gap leakage of the shaft hole of the pump cover is a problem which needs to be solved urgently at present.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that a can avoid pump cover shaft hole clearance to leak oil pump cover is provided for solve the problem that shaft hole clearance leaked.

In order to achieve the purpose of the invention, the utility model adopts the following scheme: the utility model provides a can avoid oil pump cover of pump cover shaft hole clearance leakage, includes the pump cover main part, the pump cover main part includes the shaft hole, the low-pressure region faying face that corresponds with pump body oil inlet and the high-pressure region faying face that corresponds with pump body oil-out, low-pressure region faying face and high-pressure region faying face are on same terminal surface, the low-pressure region faying face is equipped with first off-load groove, the high-pressure region faying face is equipped with second off-load groove, the shaft hole is the blind hole, be equipped with the inclined hole between shaft hole and the first off-load groove, be equipped with the spread groove between shaft hole and the second off-load groove, the shaft hole is linked together through the inclined hole with first off-load groove, the shaft hole is linked together through the spread groove with.

Preferably, one end of the inclined hole is positioned at the bottom of the first unloading groove, and the other end of the inclined hole is close to the bottom of the shaft hole.

More preferably, the connecting groove has a depth corresponding to a depth of the second relief groove.

More preferably, the depth of the first relief groove coincides with the depth of the second relief groove.

The utility model has the advantages that: through establishing the shaft hole into the blind hole, can not communicate with the air, can effectively avoid pump cover shaft hole clearance to leak, improve the volumetric efficiency of oil pump. Meanwhile, the shaft hole is communicated with the connecting groove, the first unloading groove, the inclined hole and the second unloading groove through the arrangement of the first unloading groove, the second unloading groove, the inclined hole and the connecting groove, so that lubricating oil can be in a flowing state all the time, and a better lubricating effect is ensured.

Drawings

Fig. 1 is a schematic overall structure diagram in an embodiment of the present invention;

FIG. 2 is a schematic sectional view in the direction A-A in the example.

In the figure:

1-pump cover main body 2-first unloading groove 3-inclined hole

4-shaft hole 5-connecting groove 6-second unloading groove.

Detailed Description

In order to facilitate understanding of those skilled in the art, the present invention will be further described with reference to the following examples and drawings, which are not intended to limit the present invention.

It should be noted that, in the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

Furthermore, in the present disclosure, unless explicitly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact of the first and second features, or may comprise contact of the first and second features not directly but through another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature. The terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

As shown in fig. 1-2, an oil pump cover capable of avoiding leakage of a gap between a shaft hole of the pump cover comprises a pump cover body 1, wherein the pump cover body 1 comprises a shaft hole 4, a low-pressure area joint surface corresponding to an oil inlet of a pump body and a high-pressure area joint surface corresponding to an oil outlet of the pump body, the low-pressure area joint surface and the high-pressure area joint surface are arranged on the same end surface, the low-pressure area joint surface is provided with a first unloading groove 2, the high-pressure area joint surface is provided with a second unloading groove 6, the shaft hole 4 is a blind hole, an inclined hole 3 is arranged between the shaft hole 4 and the first unloading groove 2, a connecting groove 5 is arranged between the shaft hole 4 and the second unloading groove 6, the shaft hole 4 is communicated with the first unloading groove 2 through the inclined hole 3, the shaft hole 4 is communicated with the second unloading groove 6.

When the oil pump cover capable of avoiding the gap leakage of the shaft hole of the pump cover is arranged on the pump body, the shaft hole 4 on the pump cover is a blind hole, and the gap leakage cannot be caused by the communication with air, so that the gap leakage of the shaft hole 4 of the pump cover can be avoided, and the volumetric efficiency of the oil pump is improved. Lubricating oil in the oil-out high pressure district in the pump body gets into shaft hole 4 counter shaft through second off-load groove 6 along spread groove 5 and lubricates, through inclined hole 3 intercommunication shaft hole 4 and first off-load groove 2 for high-pressure oil in shaft hole 4 flows to the first off-load groove 2 that corresponds with pump body oil inlet low pressure district through inclined hole 3, makes lubricating oil be in the mobile state always, thereby guarantees that the axle can carry out abundant lubrication.

It should be noted that, the pump cover shaft hole 4 is set as the blind hole, so that the influence of the clearance value between the shaft hole 4 and the shaft on the clearance leakage is reduced to the minimum, the clearance value can be set by considering the optimal oil film thickness, the shaft hole 4 is fully lubricated, the friction work consumption between the shaft and the shaft hole 4 is minimum, the eccentric wear failure of the shaft hole 4 is effectively improved, the clearance leakage of the pump cover shaft hole 4 can be eliminated, and the volumetric efficiency of the oil pump is improved. Moreover, because the clearance value between the shaft hole 4 and the shaft does not need to be smaller, the machining precision is not higher relatively, and the cost can be saved to a certain extent. In addition, the first relief groove 2 and the second relief groove 6 can be used for relieving partial pressure, and excessive pressure is prevented. However, it is conceivable for those skilled in the art that the pump cover structure listed in this embodiment is a pump cover structure including two shaft holes in a gear pump, and is also applicable to other oil pump types, such as a pump cover structure having only one shaft hole, such as a rotor type pump and a vane type pump.

In the present embodiment, as a preferable mode, one end of the inclined hole 3 is located at the bottom of the first relief groove 2, and the other end is close to the bottom of the shaft hole 4.

More preferably, the depth of the coupling groove 5 and the depth of the second relief groove 6 may be the same. In addition, in the present embodiment, as more preferable, the depth of the first relief groove 2 and the depth of the second relief groove 6 may be uniform.

The above description is only for the preferred embodiment of the present invention, and the present invention is not limited thereto in any way, and although the present invention has been disclosed for the preferred embodiment, it is not intended to limit the form and style of the product of the present invention, and those skilled in the art can make some modifications or modifications to the equivalent embodiment without departing from the scope of the present invention, but all that does not depart from the technical solution of the present invention still fall within the scope of the patent of the present invention.

Claims (4)

1. The utility model provides a can avoid oil pump cover of pump cover shaft hole clearance leakage, includes pump cover main part (1), pump cover main part (1) includes shaft hole (4), the low-pressure area faying face that corresponds with pump body oil inlet and the high-pressure area faying face that corresponds with the pump body oil-out, the low-pressure area faying face is with high-pressure area faying face on a terminal surface, its characterized in that: the low-pressure area faying face is equipped with first off-load groove (2), the high-pressure area faying face is equipped with second off-load groove (6), shaft hole (4) are the blind hole, be equipped with inclined hole (3) between shaft hole (4) and first off-load groove (2), be equipped with spread groove (5) between shaft hole (4) and second off-load groove (6), shaft hole (4) are linked together through inclined hole (3) with first off-load groove (2), shaft hole (4) are linked together through spread groove (5) with second off-load groove (6), shaft hole (4) are unanimous with the opening direction of first off-load groove (2) and second off-load groove (6).

2. The oil pump cover capable of avoiding the gap leakage of the shaft hole of the pump cover according to claim 1, characterized in that: one end of the inclined hole (3) is positioned at the bottom of the first unloading groove (2), and the other end of the inclined hole is close to the bottom of the shaft hole (4).

3. The oil pump cover capable of avoiding the gap leakage of the shaft hole of the pump cover according to claim 2, characterized in that: the depth of the connecting groove (5) is consistent with that of the second unloading groove (6).

4. The oil pump cover capable of avoiding the gap leakage of the shaft hole of the pump cover according to claim 3, characterized in that: the depth of the first unloading groove (2) is consistent with that of the second unloading groove (6).

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