CN212272340U

CN212272340U - External oil pump with idle gear

Info

Publication number: CN212272340U
Application number: CN202021672712.5U
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 Oil Pump Co Ltd
Priority date: 2020-08-12
Filing date: 2020-08-12
Publication date: 2021-01-01
Anticipated expiration: 2030-08-12

Abstract

The externally-mounted oil pump with the idler gear comprises a main shell body which is used for being mounted on an engine cylinder body, wherein a middle shell body which is used for mounting an idler shaft is fixedly connected to the left side of the main shell body, a pump body is fixedly connected to the left side of the middle shell body, the middle shell body comprises an upper shell body and a lower shell body, the idler gear is arranged between the upper shell body and the lower shell body, the upper end surface and the lower end surface of the idler gear are in clearance fit with the bottom surface of the upper shell body and the top surface of the lower shell body respectively, the top end of the idler shaft penetrates through the lower shell body and the idler gear upwards in sequence and is inserted into the upper shell body, a lining is further arranged between the idler shaft and the idler gear, the bottom end surface of the idler shaft can be in clearance fit with the. The utility model discloses can be convenient for the oil pump design seal structure, be convenient for follow-up dismantlement maintenance to the engine.

Description

External 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 oil pump of adorning.

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 oil pump of adorning 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 external oil pump with an idler gear comprises a main shell body arranged on an engine cylinder body, wherein a middle shell body used for installing an idler shaft is fixedly connected to the left side of the main shell body, a pump body is fixedly connected to the left side of the middle shell body, the middle shell body comprises an upper shell part and a lower shell part, the idler gear is arranged between the upper shell part and the lower shell part, the upper end surface and the lower end surface of the idler gear are in clearance fit with the bottom surface of the upper shell part and the top surface of the lower shell part respectively, the top end of the idler shaft sequentially penetrates through the lower shell part and the idler gear upwards and is inserted into the upper shell part, a bushing is further arranged between the idler shaft and the idler gear, the bottom end surface of the idler shaft can be in clearance fit with the engine cylinder body, a driving gear meshed with the idler gear is arranged at the upper end of the pump body, a, 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.

Preferably, the idler shaft is connected with the upper shell part and the lower shell part in an interference fit mode.

Further, the idler shaft is provided with a central through hole along the axial direction, the upper 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 positioned outside the shaft hole, the middle shell is provided with an oil duct which is communicated with an external oil duct and the shaft hole and can enable oil to enter the shaft hole, the upper portion of the idler shaft is provided with an upper oil hole used for enabling oil supply liquid to enter the central through hole, and the lower portion of the idler shaft is provided with a lower oil hole used for enabling the oil in the central through hole.

Or a fixing bolt penetrates through the middle of the idler shaft along the axial direction and is in clearance fit with the idler shaft, one end of the rod part of the fixing bolt extends upwards out of the idler shaft and is fixedly connected with the upper shell part, and a stepped hole for the head part of the fixing bolt to extend into is formed in the bottom end of the idler shaft.

Further, a first oil inlet hole is formed in the head of the fixing bolt in the axial direction, a second oil inlet hole communicated with the first oil inlet hole is formed in the rod of the fixing bolt in the radial direction, the first oil inlet hole is used for being communicated with an oil inlet channel in the engine cylinder body, the second oil inlet hole is used for being communicated with a gap between the fixing bolt and an idler shaft, and an idler shaft oil hole used for allowing oil in the gap to enter the space between the idler shaft and the lining is further formed in the idler shaft.

Preferably, a protrusion is annularly arranged on the outer wall of the bottom end of the idler shaft, and a step surface for accommodating the protrusion is correspondingly arranged on the bottom end surface of the lower shell part.

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 view of the overall structure in embodiment 1 of the present invention;

FIG. 2 is a partial structural view in example 1;

FIG. 3 is a perspective view from the top of the overall structure in example 1;

fig. 4 is a schematic view of the overall structure in embodiment 2 of the present invention;

FIG. 5 is a partial structural view in example 2;

fig. 6 is the utility model discloses a cross-sectional structure schematic diagram of pump cover.

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-upper shell part 3 b-lower shell part 3 c-shaft hole

4-pump body 5-idle gear 6-bush

7-engine cylinder block 8-driving gear 9-pump shaft

10-flange 11-baffle 12-rotor

13-pump cover 14-fixing bolt 15-oil duct

16-projection 17-pump shaft bolt 18 a-first oil hole

18 b-second oil hole 18 c-oil inlet channel 19-sealing ring

20-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.

Example 1

As shown in fig. 1-3, the external oil pump with an idler gear comprises a main housing 1 for being mounted on an engine cylinder 7, 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 middle housing 3 comprises an upper housing part 3a and a lower housing part 3b, the idler gear 5 is arranged between the upper housing part 3a and the lower housing part 3b, the upper end surface and the lower end surface of the idler gear 5 are respectively in clearance fit with the bottom surface of the upper housing part 3a and the top surface of the lower housing part 3b, the top end of the idler shaft 2 sequentially penetrates through the lower housing part 3b and the idler gear 5 and is inserted into the upper housing part 3a, a lining 6 is further arranged between the idler shaft 2 and the idler gear 5, the bottom end surface of the idler shaft 2 can be in clearance fit with the engine cylinder 7, a driving gear 8 meshed with the idler gear 5 is arranged at the upper end of the pump body The pump is characterized in that a flange 10 is annularly arranged at the top end of the pump body 4 along the outer edge of the pump body, a baffle 11 is installed at the top end of the flange 10, a rotor 12 is connected to a pump shaft 9 located in the pump body 4, and a pump cover 13 is installed at the bottom end of the pump body 4.

After the main shell 1 and the engine cylinder 7 are installed and connected, the power gear on the output shaft of the engine can be positioned in the main shell 1 and meshed with the idle gear 5 in the middle shell 3, so that the power transmission is realized, because the idle gear shaft 2 and the idle gear 5 are installed in the middle shell 3 on one side of the main shell 1, and then the pump body 4 is fixedly connected on the left side of the middle shell 3, the driving gear 8 of the oil pump can be meshed with the idle gear 5, so that the position of the oil pump can be moved to one side of the engine cylinder 7, so that the purpose of installing the oil pump on the outer part of an oil pan is realized, when the engine needs to be disassembled and maintained in the later period, the oil pump does not need to be disassembled and assembled, the operation is very convenient, and after the oil pump is connected with the engine cylinder 7, the part of the middle shell 3 is equivalent to a dark, the idler gear 5 can easily achieve a good sealing effect in the dark chamber, and both the idler gear 5 and the driving gear 8 are invisible in appearance.

In the embodiment, the idler shaft 2 is connected with the upper shell part 3a and the lower shell part 3b in an interference fit manner, the top end of the idler shaft 2 can be contacted with the upper shell part 3a after being inserted into the upper shell part 3a, the bottom end of the idler shaft can be limited by the engine cylinder 7, and when the oil pump works, a gap between the bottom end of the idler shaft 2 and the engine cylinder 7 can be filled with high-pressure oil, so that certain help is provided for preventing the idler shaft 2 from loosening, and the reliability is improved.

Furthermore, the idler shaft 2 is provided with a central through hole 2a along the axial direction, the upper shell part 3a is provided with a shaft hole 3c, the idler shaft 2 is inserted into the shaft hole 3c, a gap is arranged between the upper part of the idler shaft and the inner wall of the shaft hole 3c, the bush 6 is sleeved on the idler shaft 2 positioned outside the shaft hole 3c, the middle shell 3 is provided with an oil duct 15 which is communicated with an external oil path and the shaft hole 3c and can enable oil to enter the shaft hole 3c, the upper part of the idler shaft 2 is provided with an upper oil hole 2b used for enabling oil to enter the central through hole 2a, the lower part of the idler shaft 2 is provided with a lower oil hole 2c used 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, 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 outer wall of the bottom end of the idler shaft 2 is annularly provided with a bump 16, the bottom end surface of the lower shell portion 3b is correspondingly provided with a step surface for accommodating the bump 16, and the bump 16 is arranged to increase the area of the bottom end of the idler shaft 2, so that high-pressure oil in a gap between the bottom end of the idler shaft 2 and the engine block 7 can be in contact with the idler shaft 2 in a larger area, thereby further improving reliability and preventing the idler shaft 2 from loosening.

More preferably, a pump shaft bolt 17 is inserted through the center of the driving gear 8, one end of the rod portion of the pump shaft bolt 17 is inserted into the pump shaft 9 and is in threaded connection with the pump shaft 9, so that the driving gear 8 is pressed on the top end of the pump shaft 9 by the head portion of the pump shaft bolt 17, the screwing direction of the pump shaft bolt 17 is opposite to the rotating direction of the driving gear 8, rework and repair can be facilitated by adopting a mode of fastening and connecting the pump shaft bolt 17, furthermore, the connection reliability can be improved by utilizing the pump shaft bolt 17, and the problem of insufficient holding force caused by an interference fit mode with the pump shaft 9 when the driving gear 8 is too thin is avoided. 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 9.

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 9, an outer rotor is further connected to the outside of the inner rotor, and the inner rotor and the pump shaft 9 are in interference fit.

More preferably, a sealing ring 19 is clamped between the side end of the baffle 11 and the inner wall surface of the rib 10, and a passage for the idle gear 5 to extend into is formed at the right part of the baffle 11. Of course, a sealing ring may be disposed at the connection portion between the pump body 4 and the pump cover 13, so as to further improve the sealing effect of the external pump structure.

In addition, in the present embodiment, as shown in fig. 3, the main housing 1, the middle housing 3 and the pump body 4 are integrally formed by aluminum, and the sealing effect is good.

In addition, the pump cover 13 of the oil pump in the above embodiment may be provided with a groove 20 into which the bottom end of the pump shaft 9 extends, as shown in fig. 6, the pump cover 13 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 20, so that the lubricating oil between the groove 20 and the pump shaft 9 can be drained into the low-pressure cavity of the oil pump.

Example 2

The embodiment is different from the embodiment 1 only in the connection manner of the idler shaft 2 and the intermediate housing 3, specifically, as shown in fig. 4 to 5, a fixing bolt 14 is axially inserted through the middle portion of the idler shaft 2, the fixing bolt 14 is in clearance fit with the idler shaft 2, one end of a rod portion of the fixing bolt 14 extends upward out of the idler shaft 2 and is tightly connected with the upper housing portion 3a, and a stepped hole into which a head portion of the fixing bolt 14 can extend is formed at the bottom end of the idler shaft 2.

Further, the head of the fixing bolt 14 is axially provided with a first oil inlet 18a, the rod of the fixing bolt 14 is radially provided with a second oil inlet 18b communicated with the first oil inlet 18a, the first oil inlet 18a is used for communicating with an oil inlet channel 8c on the engine cylinder 7, the second oil inlet 18b is used for communicating a gap between the fixing bolt 14 and the idler shaft 2, the idler shaft 2 is further provided with an idler shaft oil hole for allowing oil in the gap to enter between the idler shaft 2 and the bush 6, the oil is introduced through the oil inlet channel 8c designed on the engine cylinder 7, oil can be made to enter the inside of the fixing bolt 14 and be discharged into the gap between the fixing bolt 14 and the idler shaft 2 through the first oil inlet hole 18a and the second oil inlet hole 18b, and then discharged into the space between the idler shaft 2 and the bush 6 through the idler shaft oil hole so as to lubricate the bush 6.

In fact, the idler shaft 2 in this embodiment may be in clearance fit with both the upper casing part 3a and the lower casing part 3b, and the positioning length of the clearance fit between the idler shaft 2 and the upper casing part 3a may be 3-4mm, and the positioning length of the clearance fit between the idler shaft 2 and the lower casing part 3b may also be 3-4mm, so as to improve reliability. Furthermore, the tightening direction of the fixing bolt 14 in the present embodiment may be the same as or opposite to the rotation direction of the idle gear 5, so that the disassembly and rework and maintenance are more convenient, and for the overall structure using the aluminum product, the firmness can be improved by screwing the fixing bolt 14 to the idle gear 5 and other components.

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 external oil pump with an idle gear, characterized in that: the engine idle gear comprises a main shell (1) arranged on an engine cylinder body (7), wherein the left side of the main shell (1) is fixedly connected with a middle shell (3) used for installing an idle gear shaft (2), the left side of the middle shell (3) is fixedly connected with a pump body (4), the middle shell (3) comprises an upper shell (3 a) and a lower shell (3 b), an idle gear (5) is arranged between the upper shell (3 a) and the lower shell (3 b), the upper end surface and the lower end surface of the idle gear (5) are respectively in clearance fit with the bottom surface of the upper shell (3 a) and the top surface of the lower shell (3 b), the top end of the idle gear shaft (2) sequentially penetrates through the lower shell (3 b) and the idle gear (5) and is inserted into the upper shell (3 a), a lining (6) is further arranged between the idle gear shaft (2) and the idle gear (5), and the bottom end surface of the idle gear shaft (2) can be in clearance fit with the engine cylinder, the upper end of the pump body (4) is provided with a driving gear (8) meshed with the idle gear (5), one end of the pump shaft (9) and the pump shaft (9) installed in the pump body (4) upwards extends out of the pump body (4) and is coaxially and fixedly connected with the driving gear (8), the top end of the pump body (4) is provided with a flange (10) along the outer edge of the pump body in an annular mode, a baffle (11) is installed at the top end of the flange (10) and located on the pump shaft (9) in the pump body (4) and connected with a rotor (12), and the pump cover (13) is installed at the bottom end of the pump body (4.

2. An external oil pump with an idler gear according to claim 1, characterized in that: the idler shaft (2) is connected with the upper shell part (3 a) and the lower shell part (3 b) in an interference fit mode.

3. An external oil pump with an idler gear according to claim 2, characterized in that: the idler shaft (2) is provided with a central through hole (2 a) along the axial direction, the upper shell (3 a) is provided with a shaft hole (3 c), the idler shaft (2) is inserted into the shaft hole (3 c), a gap is formed between the upper portion of the idler shaft and the inner wall of the shaft hole (3 c), the bushing (6) is sleeved on the idler shaft (2) located outside the shaft hole (3 c), the middle shell (3) is provided with an oil duct (15) which is communicated with an external oil path and the shaft hole (3 c) and can enable oil to enter the shaft hole (3 c), the upper portion of the idler shaft (2) is provided with an upper oil hole (2 b) used for enabling oil to enter the central through hole (2 a), and the lower portion of the idler shaft (2) is provided with a lower oil hole (2 c) used for enabling the oil in the central through hole (2 a) to enter the space between the idler shaft.

4. An external oil pump with an idler gear according to claim 1, characterized in that: the middle of the idler shaft (2) is axially provided with a fixing bolt (14) in a penetrating mode, the fixing bolt (14) is in clearance fit with the idler shaft (2), one end of the rod portion of the fixing bolt (14) extends upwards out of the idler shaft (2) and is fixedly connected with the upper shell portion (3 a), and the bottom end of the idler shaft (2) is provided with a step hole for the head portion of the fixing bolt (14) to extend into.

5. An external oil pump with an idler gear according to claim 4, characterized in that: the oil inlet structure is characterized in that a first oil inlet hole (18 a) is formed in the head of the fixing bolt (14) in the axial direction, a second oil inlet hole (18 b) communicated with the first oil inlet hole (18 a) is formed in the rod of the fixing bolt (14) in the radial direction, the first oil inlet hole (18 a) is used for being communicated with an oil inlet channel (18 c) in the engine cylinder body (7), the second oil inlet hole (18 b) is used for being communicated with a gap between the fixing bolt (14) and the idler shaft (2), and an idler shaft oil hole used for enabling oil in the gap to enter the space between the idler shaft (2) and the bush (6) is formed in the idler shaft (2).

6. An external oil pump with an idler gear according to claim 3 or 5, characterized in that: the outer wall of the bottom end of the idler shaft (2) is annularly provided with a convex block (16), and the bottom end face of the lower shell portion (3 b) is correspondingly provided with a step face for accommodating the convex block (16).

7. An external oil pump with an idler gear according to claim 6, characterized in that: a pump shaft bolt (17) penetrates through the center of the driving gear (8), one end of the rod part of the pump shaft bolt (17) is downwards inserted into the pump shaft (9) and is in threaded connection with the pump shaft (9), and therefore the head of the pump shaft bolt (17) presses the driving gear (8) on the top end of the pump shaft (9).

8. An external oil pump with an idler gear according to claim 7, characterized in that: and a step surface matched with the outer edge of the top end of the pump shaft (9) is also arranged on the bottom end surface of the driving gear (8).

9. An external oil pump with an idler gear according to claim 8, characterized in that: a sealing ring (19) is clamped between the side end of the baffle plate (11) and the inner wall surface of the flange (10), and a channel for the idler gear (5) to extend into is formed in the right part of the baffle plate (11).

10. An external oil pump with an idler gear according to claim 9, characterized in that: the main shell body (1), the middle shell body (3) and the pump body (4) are of an integrally formed structure made of aluminum parts.