CN212359892U

CN212359892U - An externally mounted oil pump with an idler gear

Info

Publication number: CN212359892U
Application number: CN202021672672.4U
Authority: CN
Inventors: 李维顺; 许仲秋; 刘光明; 佘笑梅
Original assignee: Hunan Oil Pump Co Ltd
Current assignee: Hunan Meihu Intelligent Manufacturing Co ltd
Priority date: 2020-08-12
Filing date: 2020-08-12
Publication date: 2021-01-15
Anticipated expiration: 2030-08-12

Abstract

An externally mounted oil pump with an idler gear relates to the technical field of oil pumps, comprising a main casing for mounting on an engine cylinder block, the left side of the main casing is fixedly connected with an intermediate casing for mounting an idler shaft, The left side of the intermediate casing is fixedly connected with the pump body, the idler shaft is provided with a central through hole in the axial direction, and a fixing bolt is passed through the central through hole, and one end of the fixing bolt rod extends upwards from the central through hole and is connected with the intermediate casing. Tightly connected, the outside of the idler shaft is sleeved with a bushing, the outside of the bushing is sleeved with an idler gear, a limit block is annularly arranged on the outer wall of the bottom end of the idler shaft, and the idler gear is located on the bottom end face of the intermediate housing and the limiter Between the top surfaces of the blocks, the upper end of the pump body is provided with a driving gear that meshes with the idler gear. The utility model can facilitate the design of the sealing structure of the oil pump and facilitate the subsequent disassembly and maintenance of the engine.

Description

Externally-mounted oil pump with idle gear

Technical Field

The utility model belongs to the technical field of the oil pump technique and specifically relates to indicate a take idler gear's outer dress formula oil pump.

Background

The existing large-displacement oil pump is usually installed in an oil pan below an engine crankcase, an oil pump transmission gear is driven by a gear on the engine crankshaft, the engine crankcase is very large, the center distance between an oil pump transmission shaft and the crankshaft is relatively large, and on the premise of determining the transmission ratio, if the center distance is matched by simply increasing the diameters of the oil pump transmission gear and the gear on the crankshaft, the gear on the crankshaft and the oil pump transmission gear are necessarily too large, so that the cost is increased, and in addition, the engine does not have enough space for arranging the gear with the very large diameter. Therefore, an idle gear must be added between the transmission gear of the oil pump and the crankshaft gear to transmit the driving force of the gear on the crankshaft to the transmission gear of the oil pump, so that the cost can be reduced, and the structure of the engine is more compact.

The existing oil pump with the idle gear is generally an internal pump arranged in an oil pan, the structure between the existing oil pump and an engine is compact, so that the subsequent disassembly and maintenance of the engine are very troublesome, and even the oil pump needs to be correspondingly disassembled and assembled.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a take idler gear's outer dress formula oil pump can be convenient for follow-up dismantlement maintenance to the engine.

In order to solve the technical problem, the utility model discloses a following technical scheme: an externally-mounted oil pump with an idler gear comprises a main shell body arranged on an engine cylinder body, wherein the left side of the main shell body is fixedly connected with a middle shell body used for installing an idler shaft, the left side of the middle shell body is fixedly connected with a pump body, the idler shaft is axially provided with a central through hole, a fixing bolt penetrates through the central through hole, one end of a rod part of the fixing bolt upwards extends out of the central through hole and is fixedly connected with the middle shell body, a bushing is sleeved outside the idler shaft, the idler gear is sleeved outside the bushing, a limiting block is annularly arranged on the outer wall of the bottom end of the idler shaft, the idler gear is positioned between the bottom end face of the middle shell body and the top end face of the limiting block, a driving gear meshed with the idler gear is arranged at the upper end of the pump body, a pump shaft is arranged in the, the pump comprises a pump body and is characterized in that a flange is annularly arranged at the top end of the pump body along the outer edge of the pump body, a baffle is installed at the top end of the flange, a rotor is connected to a pump shaft located in the pump body, and a pump cover is installed at the bottom end of the pump body.

Furthermore, the middle shell is provided with a shaft hole, the idler shaft is inserted into the shaft hole, a gap is formed between the upper portion of the idler shaft and the inner wall of the shaft hole, the bushing is sleeved on the idler shaft located outside the shaft hole, the middle shell is provided with an oil passage which is communicated with an external oil passage and the shaft hole and enables oil to enter the gap, the central through hole is in clearance fit with the fixing bolt, the upper portion of the idler shaft is provided with an upper oil hole which is used for enabling the oil in the gap to enter the central through hole, and the lower portion of the idler shaft is provided with a lower oil hole which is used for enabling the oil in the central through hole to.

Preferably, the bottom end of the idler shaft is provided with a stepped hole into which the head of the fixing bolt can extend, and the screwing direction of the fixing bolt when the fixing bolt is connected to the middle shell is opposite to the rotating direction of the idler gear.

More preferably, a pump shaft bolt penetrates through the center of the driving gear, and one end of the rod part of the pump shaft bolt is inserted downwards into the pump shaft and is in threaded connection with the pump shaft, so that the head part of the pump shaft bolt presses the driving gear on the top end of the pump shaft.

More preferably, the bottom end face of the driving gear is further provided with a step face matched with the outer edge of the top end of the pump shaft.

More preferably, a sealing ring is clamped between the side end of the baffle and the inner wall surface of the flange.

More preferably, the right part of the baffle is provided with a channel for the idler gear to extend into.

More preferably, the main housing, the intermediate housing and the pump body are integrally formed by aluminum.

The beneficial effects of the utility model reside in that: the middle shell is fixedly connected to the left side of the main shell and used for mounting the idler shaft and the idler gear, and the pump body is fixedly connected to the left side of the middle shell, so that the driving gear of the oil pump can be meshed with the idler gear, the position of the oil pump can be moved to one side of the engine cylinder body, and the purpose of mounting the oil pump to the outside of the oil pan is achieved, and therefore, when the engine needs to be dismounted and maintained in the later period, the oil pump does not need to be dismounted and mounted, and the oil pump mounting device is very convenient; moreover, after the engine oil pump is connected with the engine cylinder body, the part of the middle shell is equivalent to a dark cavity, and the idler gear can easily obtain a better sealing effect in the dark cavity, so that the sealing design of the oil pump is correspondingly facilitated.

Drawings

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

FIG. 2 is a schematic sectional view of a part of the embodiment without a fixing bolt;

FIG. 3 is a perspective view of the bottom view of the overall structure in the embodiment;

FIG. 4 is a perspective view of the top view of the overall structure of the embodiment;

FIG. 5 is a schematic structural diagram of the main housing, the intermediate housing and the pump body in the embodiment;

fig. 6 is a schematic cross-sectional structure diagram of a pump cover in an embodiment.

The reference signs are:

1-main shell 2-idler shaft 2 a-central through hole

2b, upper oil hole 2c, lower oil hole 3 and intermediate housing

3 a-shaft hole 4-pump body 5-fixing bolt

6-bush 7-idler gear 8-drive gear

9-limiting block 10-baffle 11-rotor

12-pump cover 13-pump shaft bolt 14-sealing ring

15-flange 16-oil duct 17-pump shaft

18-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. 1-5, an externally-mounted oil pump with an idler gear comprises a main housing 1 for mounting on an engine cylinder, a middle housing 3 for mounting an idler shaft 2 is fixedly connected to the left side of the main housing 1, a pump body 4 is fixedly connected to the left side of the middle housing 3, the idler shaft 2 is axially provided with a central through hole 2a, a fixing bolt 5 penetrates through the central through hole 2a, one end of a rod portion of the fixing bolt 5 extends upwards out of the central through hole 2a and is fixedly connected with the middle housing 3, a bushing 6 is sleeved outside the idler shaft 2, the idler gear 7 is sleeved outside the bushing 6, a limit block 9 is annularly arranged on an outer wall of the bottom end of the idler shaft 2, the idler gear 7 is located between a bottom end face of the middle housing 3 and a top end face of the limit block 9, a drive gear 8 meshed with the idler gear 7 is arranged at the upper end of the pump body 4, a pump shaft 17 is mounted in the, a flange 15 is annularly arranged at the top end of the pump body 4 along the outer edge of the pump body, a baffle 10 is installed at the top end of the flange 15, a rotor 11 is connected to a pump shaft 17 located in the pump body 4, and a pump cover 12 is installed at the bottom end of the pump body 4.

The external oil pump with the idle gear provided by the embodiment is characterized in that after the main shell 1 is connected with the engine cylinder block, the power gear on the output shaft of the engine can be positioned in the main shell 1 and meshed with the idle gear 7 in the middle shell 3, so that the power transmission is realized, because the idle gear shaft 2 and the idle gear 7 are arranged in the middle shell 3 at one side of the main shell 1, and then the pump body 4 is fixedly connected at the left side of the middle shell 3, the driving gear 8 of the oil pump can be meshed with the idle gear 7, so that the position of the oil pump can be moved to one side of the engine cylinder block, so that the purpose of mounting the oil pump on the oil pan is realized, when the engine needs to be disassembled and maintained in the later period, the oil pump is not required to be disassembled and assembled, the operation is very convenient, and not only, after the oil pump is connected with the engine, the idler gear 7 can easily achieve a good sealing effect in the dark chamber, and both the idler gear 7 and the driving gear 8 are invisible in appearance.

It should be noted that, since the idle gear 7 is located between the stopper 9 and the bottom end of the middle housing 3, the gap between the end surface of the idle gear 7 and the bottom end surface of the middle housing 3 can be controlled by changing the thickness of the stopper 9, and in addition, as shown in fig. 5, a boss with a thickness of 2mm can be designed at the bottom end of the middle housing 3, and the diameter of the boss is slightly larger than that of the end surface of the idle gear 7, so that the idle gear 7 can be conveniently contacted or supported.

Furthermore, the middle shell 3 is provided with a shaft hole 3a, the idler shaft 2 is inserted into the shaft hole 3a, a gap is arranged between the upper part of the idler shaft and the inner wall of the shaft hole 3a, the bush 6 is sleeved on the idler shaft 2 positioned outside the shaft hole 3a, the middle shell 3 is provided with an oil duct 16 which is communicated with an external oil path and the shaft hole 3a and can enable oil to enter the gap, the central through hole 2a is in clearance fit with the fixing bolt 5, the upper part of the idler shaft 2 is provided with an upper oil hole 2b for enabling the oil in the gap to enter the central through hole 2a, the lower part of the idler shaft 2 is provided with a lower oil hole 2c for enabling the oil in the central through hole 2a to enter the space between the idler shaft 2 and the bush 6, and the technical personnel in the field should, by introducing oil between the idler shaft 2 and the bushing 6, good lubrication of the outer surface of the idler shaft 2 and the inner surface of the bushing 6 is achieved.

Preferably, the bottom end of the idler shaft 2 is provided with a stepped hole into which the head of the fixing bolt 5 can extend, the screwing direction of the fixing bolt 5 when the fixing bolt 5 is connected to the intermediate housing 3 is opposite to the rotating direction of the idler gear 7, the length of the connecting part of the fixing bolt 5 and the intermediate housing 3 is at least twice of the rod diameter of the fixing bolt 5, and the part of the intermediate housing 3 into which the fixing bolt 5 extends is of a blind hole structure, so that additional redesign of a sealing structure can be avoided.

More preferably, a pump shaft bolt 13 is inserted through the center of the driving gear 8, one end of the shaft portion of the pump shaft bolt 13 is inserted downwards into the pump shaft 17 and is in threaded connection with the pump shaft 17, so that the driving gear 8 is pressed on the top end of the pump shaft 17 by the head of the pump shaft bolt 13, the screwing direction of the pump shaft bolt 13 is opposite to the rotating direction of the driving gear 8, the pump shaft bolt 13 is used for fastening and connecting, rework and repair can be facilitated, and furthermore, the connection reliability can be improved by using the pump shaft bolt 13, and the problem of insufficient holding force caused by the fact that the driving gear 8 is in interference fit with the pump shaft 17 when being too thin is solved. Wherein, the bottom end face of the driving gear 8 is also provided with a step face matched with the outer edge of the top end of the pump shaft 17.

It should be noted that the oil pump in this embodiment is a rotor type oil pump, an inner rotor is connected to the pump shaft 17, an outer rotor is further connected to the outside of the inner rotor, and the inner rotor and the pump shaft 17 are in interference fit.

More preferably, a sealing ring 14 is clamped between the side end of the baffle 10 and the inner wall surface of the rib 15, and a passage for the idle gear 7 to extend into is formed at the right part of the baffle 10. Of course, a sealing ring may be disposed at the connection portion between the pump body 4 and the pump cover 12, so as to further improve the sealing effect of the external pump structure.

In addition, in this embodiment, as shown in fig. 5, the main housing 1, the middle housing 3 and the pump body 4 are integrally formed by aluminum, which has a good sealing effect, and the idle gear 7 is screwed to the aluminum by the fixing bolt 5, which effectively improves the firmness and is more suitable for the aluminum structure.

In addition, the pump cover 12 of the oil pump in the above embodiment may be provided with a groove 18 into which the bottom end of the pump shaft 17 extends, as shown in fig. 6, the pump cover 12 is provided with an oil inlet, and then an oil drainage channel communicating with the oil inlet may be designed at the bottom of the groove 18, so that the lubricating oil between the groove 18 and the pump shaft 17 can be drained into the low-pressure chamber of the oil pump.

The above-mentioned embodiment is the utility model discloses the implementation scheme of preferred, in addition, the utility model discloses can also realize by other modes, any obvious replacement is all within the protection scope of the utility model under the prerequisite that does not deviate from this technical scheme design.

In order to make it easier for those skilled in the art to understand the improvement of the present invention over the prior art, some drawings and descriptions of the present invention have been simplified, and in order to clarify, some other elements have been omitted from this document, those skilled in the art should recognize that these omitted elements may also constitute the content of the present invention.

Claims

1. An externally mounted oil pump with an idler gear, characterized in that it comprises a main casing (1) for being installed on an engine block, and the left side of the main casing (1) is fixedly connected with a main casing (1) for installation The intermediate casing (3) of the idler shaft (2), the left side of the intermediate casing (3) is fixedly connected with the pump body (4), and the idler shaft (2) is provided with a central through hole (2a) in the axial direction ) and the central through hole (2a) is provided with a fixing bolt (5), one end of the rod of the fixing bolt (5) protrudes upwards from the central through hole (2a) and is tightly connected with the intermediate housing (3), A bushing (6) is sleeved on the outside of the idler shaft (2), an idler gear (7) is sleeved on the outside of the sleeve (6), and an annular arrangement is limited on the outer wall of the bottom end of the idler shaft (2). The position block (9), the idler gear (7) is located between the bottom end face of the intermediate housing (3) and the top end face of the limit block (9), and the upper end of the pump body (4) is provided with the idler gear (7) The meshing drive gear (8), the pump shaft (17) is installed in the pump body (4), and one end of the pump shaft (17) protrudes upward from the pump body (4) and is connected with the drive gear (8). Coaxially and fixedly connected, the top of the pump body (4) is annularly provided with a baffle (15) along its outer edge, and a baffle (10) is installed on the top of the baffle (15), located in the pump body (4). A rotor (11) is connected to the pump shaft (17) inside the pump body (4), and a pump cover (12) is installed at the bottom end of the pump body (4).

2. The externally mounted oil pump with an idler gear according to claim 1, characterized in that: the intermediate housing (3) is provided with a shaft hole (3a), and the idler shaft (2) is inserted into the shaft hole (3a) ) and there is a gap between its upper part and the inner wall of the shaft hole (3a), the bushing (6) is sleeved on the idler shaft (2) outside the shaft hole (3a), and the intermediate housing (3) There is an oil passage (16) connecting the external oil passage and the shaft hole (3a) and allowing the oil to enter the gap. The central through hole (2a) is in clearance fit with the fixing bolt (5). The idler shaft (2) ) is provided with an upper oil hole (2b) for the oil in the clearance to enter the central through hole (2a), and the lower part of the idler shaft (2) is provided with an upper oil hole (2b) for the oil in the central through hole (2a) Enter the lower oil hole (2c) between the idler shaft (2) and the bushing (6).

3. The externally mounted oil pump with an idler gear according to claim 2, characterized in that: the bottom end of the idler shaft (2) is provided with a stepped hole into which the head of the fixing bolt (5) can extend, so When the fixing bolt (5) is connected to the intermediate housing (3), the tightening direction is opposite to the rotation direction of the idler gear (7).

4. The externally mounted oil pump with an idler gear according to claim 3, characterized in that: a pump shaft bolt (13) is passed through the center of the driving gear (8), and the pump shaft bolt (13) One end of the rod is inserted downward into the pump shaft (17) and is screwed with the pump shaft (17), so that the head of the pump shaft bolt (13) presses the drive gear (8) against the pump shaft (17) the top of the.

5. The externally mounted oil pump with an idler gear according to claim 4, characterized in that: the bottom end surface of the driving gear (8) is further provided with a stepped surface that matches the outer edge of the top end of the pump shaft (17). .

6. The externally mounted oil pump with an idler gear according to claim 5, characterized in that a sealing ring (14) is clamped between the side end of the baffle plate (10) and the inner wall surface of the baffle (15). ).

7. The externally mounted oil pump with an idler gear according to claim 6, characterized in that: a channel for the idler gear (7) to extend into is opened on the right portion of the baffle plate (10).

8. The externally mounted oil pump with an idler gear according to any one of claims 1-7, characterized in that: the main casing (1), the intermediate casing (3) and the pump body (4) are One-piece construction made of aluminum parts.