VE type fuel injection pump system structure suitable for three-cylinder engine

Abstract

The utility model relates to a VE type fuel injection pump system structure suitable for a three-cylinder engine, which comprises a pump body, a distribution shell is arranged on the right side of the pump body, a transmission shaft, a cross block, a cam and a plunger which rotate synchronously are arranged in the pump body, a roller seat is rotatably arranged on the periphery of the cross block, and a roller and a peach head are respectively arranged on opposite surfaces of the roller seat and the cam. And the roller seat drives the plunger to transversely move back and forth through the cam. The device is simple in structure and small in occupied space; through structural optimization, a distribution plunger is provided with six grooves, a roller seat is provided with four supporting roller grooves, four rollers are arranged, a cam is provided with six peach heads, and the oil supply sequence is met. When the fuel passes through the first peach head of the cam, the distribution plunger works normally, and when the fuel passes through the second peach head of the cam, the unloading groove of the distribution plunger is opened, and the fuel flows into a pump cavity through the unloading groove. When the six-peach-head cam is applied to the three-cylinder pump, actually, the distribution plunger moves to an upper dead center at an interval when fuel oil is sprayed once, and a plunger cavity is communicated with a pump cavity.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of fuel injection pump, and relates to VE type fuel injection pump system structure suitable for three cylinder engine. BACKGROUND

[0002] Fuel injection pump is an important component on automobile diesel engine. VE pump system is distribution type rotor pump.

[0003] The working process of VE type fuel injection pump of three cylinder engine is as follows: low pressure fuel flows to the inlet channel of pump body, and enters pump cavity through oil pump. The engine is connected with oil pump drive shaft, drives the drive shaft to rotate, the cross block connects the drive shaft and the cam, the cam also rotates, and through the action of the cam and the plunger spring, the plunger moves in the form of compound rotation and reciprocation, so that the fuel pressure is converted from low pressure to high pressure, and the high pressure fuel flows to the fuel injection nozzle assembly through the oil outlet valve.

[0004] The VE type fuel injection pump of three cylinder engine has the following problems: the distribution plunger has three grooves, the roller seat has three supporting roller groove, there are three rollers, the cam has three peach heads, and the oil supply sequence is met. However, the pump body still needs to be improved, the advancer piston cavity of the pump body needs to be rotated by 90 degrees, and the load of each roller is large. SUMMARY

[0005] The utility model discloses a VE type fuel injection pump system structure suitable for three cylinder engine, can solve the above -mentioned problem, and the load of each roller is greatly reduced.

[0006] According to the technical scheme provided by the utility model: a VE type fuel injection pump system structure suitable for three cylinder engine, including pump body, the pump body right side installs distribution shell, is equipped with synchronous rotation drive shaft, cross block, cam, plunger in the pump body, the cross block periphery is equipped with roller seat and rotates, the roller seat, cam opposite face is equipped with roller and peach head respectively, the roller seat passes through the cam and drives the plunger to move back and forth horizontally, and the plunger is equipped with reset mechanism between the distribution shell, and the plunger periphery is equipped with control sleeve;The right part of plunger is equipped with the axial plunger shaft hole, and the front, middle and rear ends of plunger shaft hole are communicated with first plunger radial hole, second plunger radial hole and third plunger radial hole respectively, and the third plunger radial hole periphery is communicated with oil inlet groove;Second plunger radial hole is communicated with oil outlet valve, and the oil outlet valve is installed on the outside of distribution shell;6 oil inlet grooves are evenly distributed on the periphery of plunger and are respectively first oil inlet groove a, second oil inlet groove b, third oil inlet groove c, fourth oil inlet groove d, fifth oil inlet groove e and sixth oil inlet groove f;Among them, first oil inlet groove a is communicated with second oil inlet groove b, third oil inlet groove c is communicated with fourth oil inlet groove d, and fifth oil inlet groove e is communicated with sixth oil inlet groove f;The right end surface of roller seat is equipped with four rollers, and the left end surface of cam is evenly distributed with six peach heads.

[0007] As a further improvement of the utility model, the roller seat is driven by an advancer piston, and the advancer piston is installed below the roller seat; a roller rod is arranged at the lower part of the roller seat, a piston hole is arranged in the advancer piston, and the roller rod is located in the piston hole; the advancer piston is axially moved to drive the roller seat to rotate.

[0008] As a further improvement of the utility model, the transmission shaft extends out of the pump body at the left end and is connected with the engine.

[0009] As a further improvement of the utility model, the cross block is uniformly provided with transmission grooves around the periphery, the transmission shaft right end and the cam left end are provided with transmission bosses, the transmission bosses are located in the transmission grooves, and the cam and the plunger complete rotary transmission through the pin shaft.

[0010] As a further improvement of the utility model, the reset mechanism comprises a plunger spring and a spring seat, the spring seat is sleeved on the plunger, spring posts are symmetrically arranged on the left end face of the distribution shell, the plunger spring is sleeved on the spring posts, one end of the plunger spring abuts against the left end face of the distribution shell, and the other end of the plunger spring abuts against the left end part of the plunger.

[0011] As a further improvement of the utility model, the pump body is provided with a pump body oil injection hole A, the distribution shell is provided with a shell oil hole B, and the oil outlet valve is provided with an oil outlet hole C; the distribution shell is provided with a pressurizing cavity in the middle part, and the right end part of the plunger extends into the pressurizing cavity.

[0012] The positive progress effect of the application is that:

[0013] The utility model has the advantages of simple structure, small space occupation, structural optimization, six grooves of the distribution plunger, four supporting roller grooves of the roller seat, four rollers, six peach heads of the cam, and satisfied oil supply sequence. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a sectional view of the utility model.

[0015] Figure 2 It is an exploded view of the utility model.

[0016] Figure 3 It is a structural schematic view of the plunger of the utility model.

[0017] Figure 4 It is Figure 3 Q view.

[0018] Figure 5 It is a structure schematic view of the roller seat of the utility model.

[0019] Figure 6 It is a structure schematic view of the cam of the utility model. DETAILED DESCRIPTION

[0020] It should be noted that the embodiments in the utility model and the features in the embodiments can be combined with each other without conflict. The utility model will be described in detail below with reference to the drawings and in combination with the embodiments.

[0021] In order that those skilled in the art can better understand the utility model scheme, the technical scheme in the embodiments of the utility model will be described clearly and completely below in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only a part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor should belong to the protection scope of the utility model.

[0022] It should be noted that the terms "first", "second" and the like in the specification and claims of the utility model and the above drawings are used to distinguish similar objects, and do not have to be used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the utility model described herein can be implemented. In addition, "including" and "having" and the like, means that in addition to those listed in "including" and "having", other contents not listed can also be "including" and "having"; for example, a process, method, system, product or device that can include a series of steps or units, does not have to be limited to those steps or units that have been clearly listed, but can include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0023] Due to the angle problem of the drawing, part of the components may not be drawn, but its position and connection relationship can be understood according to the text expression part.

[0024] As Figures 1-2 The utility model discloses a VE type fuel injection pump system structure suitable for three-cylinder engine, including pump body 1, pump body 1 right side installs distribution shell 10, is equipped with synchronous rotation transmission shaft 2, cross block 3, cam 6, plunger 7 in pump body 1, cross block 3 outer periphery is equipped with roller seat 4, and the opposite surface of roller seat 4, cam 6 is equipped with roller 5 and button head 12 respectively, and plunger 7 is driven to move back and forth horizontally by cam 6 through roller seat 4, and reset mechanism is equipped between plunger 7 and distribution shell 10, and control sleeve 13 is equipped on the outer periphery of plunger 7. Figures 3-4As shown, the right part of the plunger 7 is provided with an axially arranged plunger shaft hole, the front, middle and rear ends of which are respectively communicated with the first, second and third plunger radial holes, and the outer periphery of the third plunger radial hole is communicated with the oil inlet groove. The second plunger radial hole is communicated with the oil outlet valve 11, and the oil outlet valve 11 is installed on the outside of the distribution housing 10.

[0025] In this embodiment, the six oil inlet grooves are evenly distributed on the outer periphery of the plunger 7, which are respectively the first, second, third, fourth, fifth and sixth oil inlet grooves a, b, c, d, e and f. Among them, the first oil inlet groove a is communicated with the second oil inlet groove b, the third oil inlet groove c is communicated with the fourth oil inlet groove d, and the fifth oil inlet groove e is communicated with the sixth oil inlet groove f.

[0026] As shown, Figures 5-6 The right end face of the roller seat 4 is provided with four rollers 5, and the left end face of the cam 6 is evenly provided with six mushroom heads 12. When the roller seat 4 rotates, the rollers 5 contact the mushroom heads 12 to move the cam 6 to the right.

[0027] The roller seat 4 is driven by the advancer piston 14, which is installed below the roller seat 4. The lower part of the roller seat 4 is provided with a roller rod, and the advancer piston 14 is provided with a piston hole, and the roller rod is located in the piston hole. The axial movement of the advancer piston 14 drives the rotation of the roller seat 4.

[0028] The left end of the transmission shaft 2 extends out of the pump body 1 and is connected to the engine.

[0029] The outer periphery of the cross block 3 is evenly provided with a transmission groove, and the right end of the transmission shaft 2 and the left end of the cam 6 are provided with a transmission boss, which is located in the transmission groove, to complete the rotational transmission of the transmission shaft 2, the cross block 3 and the cam 6. The cam 6 and the plunger 7 are rotationally transmitted through the pin shaft.

[0030] The function of the reset mechanism is to reset the plunger 7 to the left side. The reset mechanism includes a plunger spring 9 and a spring seat 8, and the spring seat 8 is sleeved on the plunger 7. The left end face of the distribution housing 10 is symmetrically provided with a spring column, and the plunger spring 9 is sleeved on the spring column. One end of the plunger spring 9 abuts against the left end face of the distribution housing 10, and the other end abuts against the left end of the plunger 7.

[0031] The pump body 1 is provided with a pump body oil injection hole A, the distribution housing 10 is provided with a housing oil hole B, and the oil outlet valve 11 is provided with an oil outlet hole C. The middle part of the distribution housing 10 is provided with a pressurizing cavity, and the right end of the plunger 7 extends into the pressurizing cavity.

[0032] The engine connects the oil pump drive shaft 2, drives the drive shaft 2 to rotate, the cross block 3 connects the drive shaft 1 and the cam 6, the cam and the plunger 7 also rotate, at the same time, the advancer piston 14 drives the roller seat 4 to rotate, the cam 6 has six studs, the studs of the cam 6 are in line contact with the rollers 5 on the roller seat 4, the cam 6 drives the axial reciprocating movement of the plunger 7 through the action of the plunger spring 9.

[0033] The fuel enters the pump cavity from the pump body injection hole A of the pump body 1, flows into the outer casing oil hole B of the distribution casing 10, enters the pressurizing cavity in the distribution casing 10 through the plunger 7 outer peripheral oil inlet groove, forms high-pressure fuel under the extrusion of the right end of the plunger 7 and enters the plunger 7 from the plunger shaft hole, the control sleeve 13 is controlled by the electromagnetic mechanism, when the electromagnetic mechanism drives the control sleeve to be located outside the first plunger radial hole, the high-pressure fuel flows into the oil outlet valve 11 through the second plunger radial hole and is discharged from the oil outlet hole C. When the electromagnetic mechanism drives the control sleeve to be away from the outer periphery of the first plunger radial hole, the high-pressure fuel flows into the pump cavity through the third plunger radial hole.

[0034] It can be understood that the above embodiments are only exemplary embodiments for illustrating the principles of the present application, but the present application is not limited to this. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the present application, and these modifications and improvements are also regarded as the protection scope of the present application.

Claims

1. A VE type fuel injection pump system structure suitable for a three-cylinder engine, characterized by, The pump body (1) is provided with a transmission shaft (2), a cross block (3), a roller seat (4), a cam (6) and a plunger (7) which rotate synchronously, the cross block (3) is provided with the roller seat (4) which rotates around the outer periphery of the cross block (3), the roller seat (4) and the cam (6) are respectively provided with a roller (5) and a mushroom head (12) on the opposite surfaces, the roller seat (4) drives the plunger (7) to move transversely back and forth through the cam (6), a reset mechanism is arranged between the plunger (7) and the distribution shell (10), and the plunger (7) is provided with a control sleeve (13) which is sleeved on the outer periphery of the plunger (7).

2. The VE type fuel injection pump system structure for a three-cylinder engine according to claim 1, characterized in that, The plunger (7) is provided with a plunger shaft hole which is arranged in an axial direction, the front, middle and rear ends of the plunger shaft hole are respectively communicated with a first plunger radial hole, a second plunger radial hole and a third plunger radial hole, and the outer periphery of the third plunger radial hole is communicated with an oil inlet groove; the second plunger radial hole is communicated with an oil outlet valve (11), and the oil outlet valve (11) is arranged on the outer side of the distribution shell (10); six oil inlet grooves are uniformly distributed on the outer periphery of the plunger (7) and are respectively a first oil inlet groove a, a second oil inlet groove b, a third oil inlet groove c, a fourth oil inlet groove d, a fifth oil inlet groove e and a sixth oil inlet groove f; the first oil inlet groove a is communicated with the second oil inlet groove b, the third oil inlet groove c is communicated with the fourth oil inlet groove d, and the fifth oil inlet groove e is communicated with the sixth oil inlet groove f; the right end surface of the roller seat (4) is provided with four rollers (5), and the left end surface of the cam (6) is uniformly provided with six mushroom heads (12).

3. The VE type fuel injection pump system structure for a three-cylinder engine according to claim 1, characterized in that, The roller seat (4) is driven by an advancer piston (14), and the advancer piston (14) is arranged below the roller seat (4); the roller seat (4) is provided with a roller rod, the advancer piston (14) is provided with a piston hole, and the roller rod is located in the piston hole; the advancer piston (14) drives the roller seat (4) to rotate through axial movement.

4. The VE type fuel injection pump system structure for a three-cylinder engine according to claim 1, characterized in that, The left end of the transmission shaft (2) extends out of the pump body (1) and is connected with an engine.

5. The VE type fuel injection pump system structure for a three-cylinder engine according to claim 1, characterized in that, The cross block (3) is uniformly provided with a transmission groove around the outer periphery, the right end of the transmission shaft (2) and the left end of the cam (6) are provided with a transmission boss, the transmission boss is located in the transmission groove, and the cam (6) and the plunger (7) are driven to rotate through a pin shaft.

6. The VE type fuel injection pump system structure for a three-cylinder engine according to claim 1, characterized in that, The reset mechanism comprises a plunger spring (9) and a spring seat (8), the spring seat (8) is sleeved on the plunger (7), the left end surface of the distribution shell (10) is symmetrically provided with a spring column, the plunger spring (9) is sleeved on the spring column, one end of the plunger spring (9) abuts against the left end surface of the distribution shell (10), and the other end abuts against the left end of the plunger (7). The pump body (1) is provided with a pump body oil injection hole A, the distribution shell (10) is provided with a shell oil hole B, and the oil outlet valve (11) is provided with an oil outlet hole C; the middle part of the distribution shell (10) is provided with a pressurizing cavity, and the right end of the plunger (7) extends into the pressurizing cavity.

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