CN219034886U

CN219034886U - Limiting structure of double-cylinder fuel injection pump

Info

Publication number: CN219034886U
Application number: CN202222396437.4U
Authority: CN
Inventors: 马春燕
Original assignee: Nanjing Weifu Jinning Co ltd
Current assignee: Nanjing Weifu Jinning Co ltd
Priority date: 2022-09-07
Filing date: 2022-09-07
Publication date: 2023-05-16
Anticipated expiration: 2032-09-07

Abstract

The utility model provides a limit structure of a double-cylinder fuel injection pump, which comprises the following components: the hydraulic tappet comprises an oil pump shell, two tappet bodies arranged in parallel at the inner bottom end of the oil pump shell, and a limiting structure arranged between the tappet bodies and the shell, wherein the limiting structure is used for limiting the lower limit of the stroke of the tappet bodies, a notch is formed in the outer wall of the oil pump shell between the two tappet bodies, and a chute with an opening facing the tappet bodies is formed in the inner wall of the oil pump shell along the height direction; the limit structure comprises: one end of the fixing piece is arranged in a notch which is arranged on the outer wall of the tappet body and is formed along the radial direction of the tappet body, and the other end of the fixing piece extends into the sliding groove; the limiting piece is arranged on the oil pump shell below the fixing piece, and when the tappet body moves to the lower limit position, the fixing piece on the tappet body can be connected with the limiting piece on the inner wall of the oil pump shell. Through the utility model, the hidden danger that the tappet body is easy to fall off in the installation process is eliminated, and the stability of the pump body in the operation process is improved.

Description

Limiting structure of double-cylinder fuel injection pump

Technical Field

The utility model relates to the technical field of fuel injection systems of internal combustion engines, in particular to a limit structure of a double-cylinder fuel injection pump.

Background

At present, a guide pin is adopted in the double-cylinder pump, a clamp spring is arranged outside the guide pin for fixation, the clamp spring and the guide pin are not standard components and are difficult to process, the clamp spring easily protrudes out of a pump body, and is easy to interfere when an oil injection pump is installed, so that the clamp spring is fallen off, the guide pin and a tappet body are fallen off, and an engine is seriously damaged;

meanwhile, a pin hole for inserting a guide pin and a clamp spring groove for accommodating a clamp spring are formed in the shell, and a tappet body groove is formed in the tappet body, so that the situation that all traditional guide pins are limited by different matched tappet body groove structures and different matched pump body structures is considered, the shape and the size of the traditional guide pins are different, and the traditional guide pins are difficult to standardize, as shown in the reference figures 1-5.

In view of this, there is a need for an improvement in the prior art limit structure to solve the above-mentioned problems.

Disclosure of Invention

The utility model aims to disclose a limit structure of a double-cylinder fuel injection pump, which solves the problems that in the prior art, a clamp spring easily protrudes out of a pump body, interference easily occurs when the fuel injection pump is installed, the clamp spring easily falls off, and a guide pin and a tappet body fall off.

In order to achieve the above object, the present utility model provides a limit structure of a dual-cylinder fuel injection pump, comprising: the oil pump shell, two tappet bodies arranged in parallel at the bottom end inside the oil pump shell, a plunger spring arranged at the top end of the tappet body, and a limiting structure arranged between the tappet body and the shell, wherein the limiting structure is used for limiting the lower limit of the stroke of the tappet body,

the oil pump shell is provided with a notch on the outer wall between the two tappet bodies, and the inner wall of the oil pump shell is provided with a chute with an opening facing the tappet bodies along the height direction;

the limit structure comprises:

one end of the fixing piece is arranged in a notch which is arranged on the outer wall of the shell of the tappet body and is formed along the radial direction of the tappet body, and the other end of the fixing piece extends into the sliding groove;

and the limiting piece is arranged on the oil pump shell below the fixing piece, and when the tappet body moves to the lower limit position, the fixing piece on the tappet body can be connected with the limiting piece on the inner wall of the oil pump shell.

As a further improvement of the utility model, a through hole parallel to the axis direction of the roller is arranged on the oil pump housing, and the limiting piece extends into the chute through the through hole.

As a further improvement of the utility model, the limiting piece is a cotter pin, and the open end of the cotter pin extends into the chute from the through hole until extending out of the notch and bending downwards, and is fixed relative to the oil pump housing.

As a further improvement of the utility model, the limiting piece is a cotter pin.

As a further improvement of the utility model, the fixing piece is a cylindrical pin, one end of the cylindrical pin is inserted into the notch, and the other end of the cylindrical pin extends out of the notch and is positioned in the chute.

Compared with the prior art, the utility model has the beneficial effects that:

(1) The utility model provides a limit structure of double-cylinder fuel injection pump, adopts the structure of seting up the spout in the pump body inboard, presses the mounting on the tappet body, and the locating part activity inserts in the through-hole that the axial direction that is on a parallel with the gyro wheel link up of tappet body is arranged in, and with oil pump body fixed connection, and can accept the mounting of tappet body in the down-going process, realizes the assembly of tappet body, makes its and oil pump body fixed connection through the spacing part and the bending part of locating part, and this assembly method is simple, and has improved the stability of tappet body operation in-process, avoids tappet body to take place to break away in the stroke of falling, causes the whereabouts of tappet body;

(2) Compared with the assembly of jump ring and guide pin to tappet body that adopts among the prior art, on the one hand, the stability of assembly can be improved to the structure of this application, interference problem when having solved the injection pump installation, avoid tappet body emergence to drop, cause serious harm to the engine, on the other hand, cotter pin and cylindrical cylindric lock are standard component, low price, easily purchase, the assembly is simple, repeatedly usable, but the fixed form of guide pin and jump ring that uses among the prior art, on the one hand, need set up jump ring groove and pinhole on the oil pump shell, and set up tappet body groove on tappet body, processing technology is many, waste time and energy, on the other hand jump ring and guide pin are not standard component, difficult processing, and the fixed structure stability of jump ring is not high, and the jump ring outstanding pump body produces the interference when the injection pump installation easily, lead to the jump ring to drop, guide pin and tappet body drop.

Drawings

FIG. 1 is a tappet structure of a dual cylinder fuel injection pump of the prior art;

FIG. 2 is a schematic diagram of the oil pump housing of a dual-cylinder fuel injection pump of the prior art;

FIG. 3 is a cross-sectional view taken along the direction E-E in FIG. 2, illustrating the positional relationship between the guide pin holes and the snap spring slots;

FIG. 4 is a schematic diagram of a snap spring in a dual-cylinder fuel injection pump in the prior art;

FIG. 5 is a schematic diagram showing the cooperation of a snap spring and a guide pin of a dual-cylinder fuel injection pump in the prior art;

FIG. 6 is a schematic diagram showing the assembly relationship between the tappet body and the fixing member in the limit structure of the double-cylinder fuel injection pump;

FIG. 7 is a schematic diagram of a cotter pin in a spacing structure of a dual-cylinder fuel injection pump of the present utility model;

FIG. 8 is a schematic diagram illustrating assembly of a limiter in a limit structure of a dual-cylinder fuel injection pump according to the present utility model;

fig. 9 is a schematic sectional view taken along the direction B-B in fig. 8, and illustrates the positional relationship between the stopper and the fixing member.

In the figure: 1. a tappet body; 10', tappet body grooves; 2. a roller; 3. an oil pump housing; 10. a cylindrical pin; 30. a notch; 31. a cotter pin; 300. a chute; 311. a limit part; 312. a bending part; 30 'snap spring grooves, 31' and guide pins; 310', pin holes; 301', snap springs.

Detailed Description

The present utility model will be described in detail below with reference to the embodiments shown in the drawings, but it should be understood that the embodiments are not limited to the present utility model, and functional, method, or structural equivalents and alternatives according to the embodiments are within the scope of protection of the present utility model by those skilled in the art.

In order that the utility model may be readily understood, a more complete description of the utility model will be rendered by reference to the appended drawings. The drawings illustrate preferred embodiments of the utility model. This utility model may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

Please refer to fig. 1 to 9 for a specific embodiment of a limit structure of a dual-cylinder fuel injection pump according to the present utility model.

Referring to fig. 6-9, a limit structure of a dual-cylinder fuel injection pump comprises an oil pump housing 3, two tappet bodies 1 arranged in parallel at the bottom end inside the oil pump housing 3, a plunger spring arranged at the top end of the tappet bodies 1, and a limit structure arranged between the tappet bodies 1 and the oil pump housing 3, wherein the limit structure is used for limiting the lower limit of the stroke of the tappet bodies 1, and a notch 30 is formed in the outer wall of the oil pump housing 3 between the two tappet bodies 1; the limit structure comprises: the fixing piece is horizontally and fixedly arranged in a mounting hole which is formed in the outer wall of the tappet body 1 and is formed along the radial direction of the tappet body, and the outer end of the fixing piece extends into a chute 300 which is formed in the inner wall of the oil pump housing 3 along the height direction and is in sliding fit with the chute 300; the limiting piece is movably inserted into the through hole which is formed in the oil pump housing 3 in a penetrating manner along the axial direction parallel to the roller 2, is fixedly connected with the oil pump housing 3, and can be used for bearing the fixing piece of the tappet body 1 in the descending process. Referring to fig. 8, a bending portion 312 is formed at the extending end of the limiting member in the notch 30, and a limiting portion 311 is formed at the other end, so that the limiting member is fixedly connected with the oil pump housing 3; through adopting the structure that the chute 300 is formed in the inner side of the pump body, the fixing piece is pressed on the tappet body 1, the limiting piece is movably inserted into the through hole which is formed in the oil pump housing 3 in a penetrating manner along the axial direction parallel to the roller 2 and is fixedly connected with the oil pump housing 3, and the fixing piece of the tappet body 1 in the descending process can be received, as shown in fig. 9, the assembling of the tappet body 1 is realized, and the tappet body 1 is fixedly connected with the oil pump housing 3 through the limiting part 311 and the bending part 312 of the limiting piece;

the stopper portion is disposed through the chute 300. Referring to fig. 7, the stopper is a cotter pin 31. Referring to fig. 6, the fixing member is a cylindrical pin 10. The limiting piece is detachably connected with the oil pump housing 3. Compared with the prior art that the clamp spring 301' and the guide pin 31' are adopted for assembling the tappet body 1, on one hand, the structure of the clamp spring can improve the stability of the assembly, the interference problem when an injection pump is installed is solved, the tappet body 1 is prevented from falling off, serious damage is caused to an engine, on the other hand, the split pin 31 and the cylindrical pin 10 are standard components, the clamp spring is low in price and easy to purchase, the clamp spring is easy to assemble and can be reused, the guide pin 31' and the clamp spring 301' used in the prior art are fixed, on the one hand, the clamp spring 301' groove 30 and the pin hole 310' are required to be formed in the oil pump housing 3, and the tappet body 1 is provided with the tappet body groove 10', the processing technology is more, time and labor are wasted, on the other hand, the clamp spring 301' and the guide pin 31' are not standard components, the processing is difficult, the fixed structure of the clamp spring 301' is not high in stability, and the clamp spring 301' protrudes out of the pump body, interference is easy to occur when the injection pump is installed, the clamp spring 301' falls off, and the guide pin 31' falls off from the tappet body 1.

Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.

Claims

1. A limit structure of a double-cylinder fuel injection pump, comprising: the oil pump shell, two tappet bodies arranged in parallel at the bottom end inside the oil pump shell, a plunger spring arranged at the top end of the tappet body, and a limiting structure arranged between the tappet body and the shell, wherein the limiting structure is used for limiting the lower limit of the stroke of the tappet body,

the limit structure comprises:

2. The limit structure of the double-cylinder fuel injection pump according to claim 1, wherein the oil pump housing is provided with a through hole parallel to the axial direction of the roller, and the limit piece extends into the chute through the through hole.

3. The limit structure of the double-cylinder fuel injection pump according to claim 2, wherein the limit member is a cotter pin, and the open end of the cotter pin extends into the chute from the through hole until extending out of the notch to be bent downwards, and is fixed relative to the oil pump housing.

4. The limit structure of a dual cylinder fuel injection pump of claim 1, wherein said limit member is a cotter pin.

5. The limit structure of the double-cylinder fuel injection pump according to claim 1, wherein the fixing piece is a cylindrical pin, one end of the cylindrical pin is inserted into the notch, and the other end of the cylindrical pin extends out of the notch and is located in the sliding groove.