Novel roller tappet body with improved diameter-height ratio

Abstract

The utility model discloses a novel roller tappet body with an improved diameter-height ratio, which belongs to the field of roller tappet bodies and comprises a tappet body, a round hole is arranged on the tappet body, a fixed seat is arranged at a position close to the upper end in the tappet body, a plunger contact surface is arranged on the fixed seat, and a spring seat component is mounted at the upper end of the tappet body. The spring seat assembly is arranged, the assembly groove is formed in the tappet body, the assembly insertion plate is arranged on the installation plate at the lower end of the spring seat body, the anti-rotation function after the spring seat assembly and the tappet body are installed is achieved through cooperation of the assembly insertion plate and the assembly groove, the area of the installation plate formed by punching of the spring seat assembly is increased, and punching forming is facilitated; and the limiting matching position is improved, the matching limiting length of the spring seat assembly and the tappet body is increased, the height of the tappet body can be increased, limiting matching points are increased to four positions and dispersed on the periphery of the tappet body, matching is stable after assembly, and the precision and stability of the fuel injection pump are guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to a roller tappet body field, in particular to a new roller tappet body with improved diameter-height ratio. BACKGROUND

[0002] The roller tappet body is a key component of the roller tappet, and is a component inside the fuel injection pump. The main function is to convert the rotary motion of the camshaft into linear reciprocating motion of the roller tappet, thereby driving the plunger to operate and supply oil. The existence of the roller tappet body can make the output of the fuel injection pump more stable, reduce noise and vibration, and improve the accuracy and stability of the fuel injection pump. It plays a very important role for high-performance engines.

[0003] During use of the roller tappet body, the cam rotates under the drive of the driving mechanism, and periodically pushes the plunger to reciprocate, thereby realizing the processes of oil intake, oil compression and oil return. However, in the existing roller tappet body, the spring seat is stamped into a flat slot, which cooperates with the flat boss of the roller body to realize the anti-rotation function. The spring seat stamping flat slot increases the difficulty of mold forming, and is prone to stretching and tearing. The length of the spring seat and the roller body is too small, and after assembly, it is easy to disengage and cause displacement, disengagement and jamming during movement, resulting in poor accuracy and stability of the fuel injection pump. UTILITY MODEL CONTENTS

[0004] The main purpose of the utility model is to provide a new roller tappet body with improved diameter-height ratio, which can effectively solve the problems in the background art.

[0005] To achieve the above purpose, the technical scheme adopted by the utility model is as follows:

[0006] A new roller tappet body with improved diameter-height ratio, comprising a tappet body, a circular hole is formed in the tappet body, and a fixed seat is arranged at the position close to the upper end of the inner part of the tappet body, a plunger contact surface is arranged on the fixed seat, and a spring seat assembly is installed at the upper end of the tappet body.

[0007] Preferably, a roller assembly is arranged at the bottom end of the inner part of the tappet body, and the components in the roller assembly are connected in the circular hole of the tappet body.

[0008] Preferably, the spring seat assembly is fixedly connected with the tappet body, and the upper end of the spring seat assembly is higher than the tappet body.

[0009] Preferably, the spring seat assembly comprises an assembly groove, a spring seat body, a mounting plate, an assembly plug plate and a through hole, the assembly groove is arranged at the upper end of the tappet body and is symmetrically arranged on the tappet body, the spring seat body and the mounting plate are fixedly connected, the assembly plug plate is arranged on the mounting plate and is symmetrically arranged on the mounting plate, the spring seat body and the mounting plate are clamped at the upper end of the tappet body, the assembly plug plate is clamped in the assembly groove on the tappet body, and the through hole is arranged on the spring seat body.

[0010] Preferably, the roller assembly comprises a roller body, a roller inner ring, a roller pin shaft, a steel wire retainer and an annular groove, the roller body and the roller inner ring are sleeved together, the roller pin shaft is inserted into the inside of the roller inner ring, the annular groove is arranged at the end of the roller pin shaft, and the steel wire retainer is connected in the annular groove on the roller pin shaft.

[0011] Compared with the prior art, the improved novel roller tappet body has the following beneficial effects: the spring seat assembly is arranged on the tappet body, the assembly plug plate is arranged on the mounting plate at the lower end of the spring seat body, the anti-rotation function of the spring seat assembly after installation is realized by cooperation of the assembly plug plate and the assembly groove, the area of the mounting plate stamped and formed by the spring seat assembly is increased, which is beneficial to stamping and forming, reduces the scrap rate of forming and the cost, improves the limiting cooperation position, the length of the cooperation limiting position of the spring seat assembly and the tappet body is lengthened, the height of the tappet body can be increased, the limiting cooperation points are increased to four and are dispersed around the tappet body, the cooperation is stable after assembly, and the precision and stability of the fuel injection pump are ensured. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 It is a schematic view of the overall structure of the utility model;

[0013] Figure 2 It is a schematic view of the internal structure of the tappet body of the utility model;

[0014] Figure 3 It is a schematic view of the structure of the spring seat assembly of the utility model;

[0015] Figure 4 It is a schematic view of the structure of the roller assembly of the utility model.

[0016] In the drawing: 1, tappet body; 2, round hole; 3, fixed seat; 4, plunger contact surface; 5, spring seat assembly; 501, assembly groove; 502, spring seat body; 503, mounting plate; 504, assembly plug plate; 505, through hole; 6, roller assembly; 601, roller body; 602, roller inner ring; 603, roller pin shaft; 604, steel wire retainer; 605, annular groove. DETAILED DESCRIPTION

[0017] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0018] like Figures 1-4 As shown, an improved roller tappet with a higher diameter-to-height ratio includes a tappet 1 with a circular hole 2. A fixing seat 3 is located near the upper end of the tappet 1, and a plunger contact surface 4 is provided on the fixing seat 3. A spring seat assembly 5 is mounted on the upper end of the tappet 1. A roller assembly 6 is located at the lower end of the tappet 1, and components of the roller assembly 6 are connected to the circular hole 2 on the tappet 1. The spring seat assembly 5 is fixedly connected to the tappet 1, and its upper end is higher than that of the tappet 1.

[0019] During the assembly of the roller tappet, the spring seat assembly 5 is installed at the upper end of the tappet 1, and the spring seat assembly 5 is aligned with the plunger contact surface 4 on the fixed seat 3. The roller assembly 6 is installed at the lower end of the tappet 1 through the round hole 2, thus completing the assembly of the entire roller tappet. The assembled roller tappet is then installed on the fuel injection pump, and the roller tappet is fixedly connected to the pump body. At the same time, the end of the plunger passes through the spring seat assembly 5 and contacts the plunger contact surface 4. During the operation of the fuel injection pump, the drive mechanism rotates the cam, and the outer peripheral surface of the cam contacts the roller assembly 6. When the protruding part of the cam rotates and approaches the roller tappet, the roller assembly 6 rotates on the tappet 1 and applies force under the action of the cam protruding part. The entire roller tappet moves inside the pump body, thereby moving the plunger. The plunger pushes the liquid in the pump body out, achieving the purpose of fuel injection. When the protruding part of the cam gradually moves away from the roller assembly 6, the plunger slowly moves down under the push of the spring on the spring seat assembly 5, which expands the oil chamber volume and reduces the fuel pressure. At this time, the fuel inlet opens in time to guide the fuel into the pump chamber. This process is repeated to achieve the process of fuel suction and fuel injection.

[0020] According to the above implementation scheme, the spring seat assembly 5 includes an assembly groove 501, a spring seat body 502, a mounting plate 503, an assembly insert plate 504, and a through hole 505. The assembly groove 501 is opened at the upper end of the pusher body 1, and the assembly groove 501 is symmetrically arranged on the pusher body 1. The spring seat body 502 and the mounting plate 503 are fixedly connected. The assembly insert plate 504 is arranged on the mounting plate 503, and the assembly insert plate 504 is symmetrically arranged on the mounting plate 503. The spring seat body 502 and the mounting plate 503 are snapped into the upper end of the pusher body 1. The assembly insert plate 504 is snapped into the assembly groove 501 on the pusher body 1. The through hole 505 is opened in the spring seat body 502.

[0021] When installing the spring seat assembly 5, the spring seat body 502 and the mounting plate 503 are arranged on the upper end of the tappet body 1 close to the fixed seat 3, the assembly plug plates 504 at both ends of the mounting plate 503 are connected into the assembly grooves 501 on the tappet body 1, thereby completing the installation of the spring seat body 502. In use, the plunger passes through the through hole 505 on the spring seat body 502 to abut against the plunger contact surface 4. In the process of movement of the plunger, the spring seat assembly 5 has the effect of clamping and preventing rotation with the tappet body 1, thereby ensuring the stability of use. Meanwhile, the entire tappet body 1 is high in height, thereby increasing the use effect.

[0022] Through the above embodiment, the roller assembly 6 comprises a roller body 601, a roller inner ring 602, a roller pin shaft 603, a steel wire retainer 604 and an annular groove 605. The roller body 601 and the roller inner ring 602 are sleeved together. The roller pin shaft 603 is inserted into the inside of the roller inner ring 602. The annular groove 605 is arranged at the end of the roller pin shaft 603. The steel wire retainer 604 is connected into the annular groove 605 on the roller pin shaft 603.

[0023] When installing the roller assembly 6, the roller inner ring 602 and the roller body 601 are installed and sleeved together. Then, the structure composed of the roller body 601 and the roller inner ring 602 is arranged on the lower end of the tappet body 1. The roller pin shaft 603 penetrates through the round hole 2 and the roller inner ring 602. The steel wire retainer 604 is arranged in the annular groove 605 at the end of the roller pin shaft 603, thereby completing the installation of the roller assembly 6. In the process of using the fuel injection pump, the cam contacts the roller body 601. With the rotation of the cam, the roller body 601 exerts force on the tappet body 1 through the roller inner ring 602 and the roller pin shaft 603, so that the tappet body 1 moves inside the pump body to realize the process of oil suction and oil compression. In this process, the roller body 601 rotates through the roller inner ring 602, which does not affect the normal operation of the cam. The structure is simple and the use effect is excellent.

[0024] It should be noted that the spring seat assembly 5 is arranged on the tappet body 1. The assembly plug plate 504 is arranged on the mounting plate 503 at the lower end of the spring seat body 502. The anti-rotation function after the installation of the spring seat assembly 5 and the tappet body 1 is realized by the assembly plug plate 504 and the assembly groove 501. The area of the stamping formed mounting plate 503 of the spring seat assembly 5 is increased, which is beneficial to stamping forming, reduces the scrap rate of forming tearing and reduces the cost. The length of the limiting and cooperating position of the spring seat assembly 5 and the tappet body 1 is lengthened, which can increase the height of the tappet body 1. The limiting and cooperating points are increased to four and dispersed around the tappet body 1. After assembly, the cooperation is stable, thereby ensuring the precision and stability of the fuel injection pump.

[0025] The basic principle and main features of the present application and the advantages of the present application are shown and described above. Those skilled in the art should understand that the present application is not limited by the above examples, and the above examples and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A novel roller tappet with improved diameter-to-height ratio, comprising a tappet (1), wherein a circular hole (2) is provided on the tappet (1), and a fixing seat (3) is provided inside the tappet (1) near the upper end, wherein a plunger contact surface (4) is provided on the fixing seat (3), characterized in that: The upper end of the tappet body (1) is provided with a spring seat assembly (5), the spring seat assembly (5) comprises an assembly groove (501), a spring seat body (502), a mounting plate (503), an assembly plug plate (504) and a through hole (505), the assembly groove (501) is opened in the upper end of the tappet body (1), and the assembly groove (501) is symmetrically arranged on the tappet body (1), the spring seat body (502) and the mounting plate (503) are fixedly connected, the assembly plug plate (504) is arranged on the mounting plate (503), and the assembly plug plate (504) is symmetrically arranged on the mounting plate (503), the spring seat body (502) and the mounting plate (503) are clamped on the upper end of the tappet body (1), the assembly plug plate (504) is clamped in the assembly groove (501) on the tappet body (1), and the through hole (505) is opened on the spring seat body (502).

2. A new roller lifter body with improved height-diameter ratio according to claim 1, characterized in that: The inner bottom end of the tappet body (1) is provided with a roller assembly (6), and the components in the roller assembly (6) are connected in the circular hole (2) on the tappet body (1).

3. A new roller lifter body with improved height-diameter ratio according to claim 2, characterized in that: The spring seat assembly (5) is fixedly connected with the tappet body (1), and the upper end of the spring seat assembly (5) is higher than the tappet body (1).

4. A new type of roller plunger body with improved diameter-height ratio, according to claim 3, characterized in that: The roller assembly (6) comprises a roller body (601), a roller inner ring (602), a roller pin shaft (603), a steel wire retainer (604) and an annular groove (605), the roller body (601) and the roller inner ring (602) are sleeved together, the roller pin shaft (603) is inserted into the inner part of the roller inner ring (602), the annular groove (605) is opened at the end of the roller pin shaft (603), and the steel wire retainer (604) is connected in the annular groove (605) on the roller pin shaft (603).

Images