阅读说明：本技术 滚子挺杆及其组装方法 (Roller tappet and method for assembling same ) 是由 沈宇辉 陈泳 于 2019-11-04 设计创作，主要内容包括：一种滚子挺杆及其组装方法,滚子挺杆包括：壳体,具有中空腔,壳体的外周壁上开设有通孔；桥接件,横穿中空腔且与壳体固定连接,桥接件包括桥接件第一端部,桥接件第一端部凸出于通孔。因桥接件与壳体固定连接,桥接件与壳体集成为一体,一方面,可避免桥接件和壳体因上下相对运动导致噪声的出现,从而提高了挺杆的NVH性能；另一方面,壳体和桥接件之间不会产生周向相对运动,还可以减少凸轮和挺杆的滚轮接触面变化的值,也可减少噪声的出现。可见,本发明实施例所提供的滚子挺杆,通过将桥接件与壳体固定连接,壳体与桥接件之间不会产生相对运动,降低了桥接件的活动自由度,减少噪声,提高了挺杆的NVH性能。(A roller tappet and a method of assembling the same, the roller tappet comprising: the shell is provided with a hollow cavity, and a through hole is formed in the peripheral wall of the shell; and the bridge part crosses the hollow cavity and is fixedly connected with the shell, and the bridge part comprises a first bridge part end which protrudes out of the through hole. Because the bridging piece is fixedly connected with the shell, and the bridging piece is integrated with the shell, on one hand, noise caused by relative vertical movement of the bridging piece and the shell can be avoided, and the NVH performance of the tappet is improved; on the other hand, no circumferential relative movement is generated between the housing and the bridge, and the variation value of the roller contact surface of the cam and the tappet can be reduced, and the occurrence of noise can be reduced. Therefore, according to the roller tappet provided by the embodiment of the invention, the bridging piece is fixedly connected with the shell, so that relative movement cannot be generated between the shell and the bridging piece, the moving freedom degree of the bridging piece is reduced, noise is reduced, and the NVH performance of the tappet is improved.)

1. A roller lifter, comprising:

the shell is provided with a hollow cavity, and a through hole is formed in the peripheral wall of the shell;

a bridge traversing the hollow cavity and fixedly connected with the housing, the bridge including a bridge first end portion passing through the through hole and protruding from the through hole.

2. The tappet of claim 1, wherein the bridge first end is fixedly connected to a sidewall of the through-hole.

3. The roller lifter of claim 2, wherein the housing has a raised portion on an inner circumferential wall thereof;

the bridge further includes:

a bridge second end supported by and fixedly connected to the boss.

4. The roller lifter of claim 3, wherein the housing further includes a first stop and a second stop, the first stop and the second stop are symmetrical about a center line of the through hole, the bridge is located below a bottom end of the first stop and a bottom end of the second stop, and both the bottom ends of the first stop and the second stop are fixedly connected to the bridge.

5. The roller lifter according to any one of claims 1 to 4, wherein the bridge member is fixed to the housing by welding or bonding.

6. The roller lifter according to any one of claims 1 to 4, further comprising: a plunger; a plunger mating surface is disposed on the bridge member bottom surface and adapted to mate with the plunger.

7. The roller lifter according to any one of claims 1 to 4, further comprising:

the roller is arranged in the shell and supported on the shell.

8. The roller lifter of claim 7, further comprising:

a pin through which the roller is supported on the housing.

9. A method of assembling a roller tappet, comprising:

obtaining a bridge and a housing according to any one of claims 1-8;

supporting the bridge to the housing with the bridge traversing the hollow cavity;

fixedly connecting the bridge and the housing.

10. The method of assembling according to claim 9, wherein said obtaining a bridge and a housing according to any one of claims 1-8 comprises: obtaining a bridge and a housing according to any one of claims 4-8;

the step of fixedly connecting the bridge and the housing includes:

applying a force to the bridge such that the bridge contacts the first and second stops of the housing, respectively;

welding or bonding the bridge to the housing.

Technical Field

The embodiment of the invention relates to the technical field of hydraulic pressure, in particular to a roller tappet and an assembling method thereof.

Background

The high-pressure oil pump is actuated by a corresponding cam of a rotating shaft (e.g., a camshaft or a crankshaft) of the internal combustion engine. More specifically, the high-pressure oil pump is provided with a roller tappet, and a plunger of the high-pressure oil pump can reciprocate under the driving action of the roller tappet to provide power for the high-pressure oil pump. The roller tappet is arranged between a plunger of the high-pressure oil pump and a cam of a cam shaft, the cam shaft rotates, the cam drives the roller tappet to do reciprocating motion in a through hole of the cylinder cover, and the roller tappet drives the plunger to do reciprocating motion.

The roller tappet housing is provided with a bridging piece, one end of the bridging piece protrudes out of the roller tappet housing, and the other end of the bridging piece is supported on a convex part of the inner circumferential surface of the roller tappet housing. The portion protruding from the roller lifter housing cooperates with the groove of the cylinder head to prevent rotation of the roller lifter housing during operation.

However, conventional roller tappets have poor Noise, Vibration, and Harshness (NVH) performance.

Therefore, how to improve the NVH performance of the roller tappet is a technical problem to be solved urgently.

Disclosure of Invention

The technical problem solved by the embodiment of the invention is to improve the NVH performance of the roller tappet.

To solve the above problem, an embodiment of the present invention provides a roller tappet including:

the shell is provided with a hollow cavity, and a through hole is formed in the peripheral wall of the shell;

a bridge traversing the hollow cavity and fixedly connected with the housing, the bridge including a bridge first end portion passing through the through hole and protruding from the through hole.

Optionally, the first end of the bridge is fixedly connected to a side wall of the through hole.

Optionally, the inner peripheral wall of the housing has a boss thereon;

the bridge further includes:

a bridge second end supported by and fixedly connected to the boss.

Optionally, the housing further includes a first stopper portion and a second stopper portion, the first stopper portion and the second stopper portion are symmetrical with respect to a center line of the through hole, the bridging member is located below a bottom end of the first stopper portion and a bottom end of the second stopper portion, and both the bottom end of the first stopper portion and the bottom end of the second stopper portion are fixedly connected to the bridging member.

Optionally, the fixing manner of the bridge and the shell is welding or bonding.

Optionally, the roller tappet further comprises: a plunger;

a plunger mating surface is disposed on the bridge member bottom surface and adapted to mate with the plunger.

Optionally, the roller tappet further comprises:

the roller is arranged in the shell and supported on the shell.

Optionally, the roller tappet further comprises:

a pin through which the roller is supported on the housing.

To solve the above problem, an embodiment of the present invention further provides an assembling method of a roller tappet, including:

obtaining the bridge and the shell;

supporting the bridge to the housing with the bridge traversing the hollow cavity;

fixedly connecting the bridge and the housing.

Optionally, the step of fixedly connecting the bridge and the housing comprises:

applying a force to the bridge such that the bridge contacts the first and second stops of the housing, respectively;

welding or bonding the bridge to the housing.

Compared with the prior art, the technical scheme of the embodiment of the invention has the following advantages:

according to the roller tappet provided by the embodiment of the invention, in the working process of the roller tappet, the cam transmits acting force to the shell through the roller and transmits the acting force to the bridging piece through the shell, and the bridging piece is fixedly connected with the shell and is integrated with the shell, so that on one hand, noise caused by up-down relative motion of the bridging piece and the shell can be avoided, and the NVH performance of the tappet is improved; on the other hand, no circumferential relative movement is generated between the housing and the bridge, and the variation value of the roller contact surface of the cam and the tappet can be reduced, and the occurrence of noise can be reduced. It can be seen that, according to the roller tappet provided in the embodiments of the present invention, by fixedly connecting the bridge to the housing, no relative motion is generated between the housing and the bridge, so that the freedom of movement of the bridge is reduced, noise is reduced, and the NVH performance of the tappet is improved.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

FIG. 1 is an exploded view of a roller tappet provided in accordance with an embodiment of the present invention;

FIG. 2 is a schematic diagram of an assembled roller lifter configuration provided by an embodiment of the present invention;

FIG. 3 is a bottom view of a roller tappet provided in accordance with an embodiment of the present invention;

fig. 4 is a flow chart of a method of assembling a roller tappet according to an embodiment of the present invention;

fig. 5 is an alternative flow chart of a method of assembling a roller lifter according to an embodiment of the present invention.

Wherein: 10-a housing; 100-a through hole; 20-a boss; 30-a bridge member; 300-plunger mating surface; 31-bridge first end; 32-bridge second end; 41-a first stop; 42-a second stop; 50-a roller; 60-pin.

Detailed Description

As is clear from the background art, the conventional roller lifter is inferior in NVH performance.

In order to improve NVH performance of the roller tappet, an embodiment of the present invention provides a roller tappet, and the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that the indication of the direction or the positional relationship referred to in the present specification is based on the direction or the positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and it is not intended to indicate or imply that the indicated device must have a specific direction, be configured in a specific direction, and thus, should not be construed as limiting the present invention.

Referring to fig. 1 to 3, fig. 1 is an exploded view of a roller tappet according to an embodiment of the present invention. FIG. 2 is a schematic diagram of an assembled roller lifter configuration provided by an embodiment of the present invention; fig. 3 is a bottom view of a roller tappet provided in accordance with an embodiment of the present invention.

As shown, an embodiment of the present invention provides a roller tappet including:

a housing having a hollow cavity (not shown) and having a through hole 100 formed in an outer circumferential wall thereof;

a bridge 30 crossing the hollow cavity and fixedly connected to the housing, wherein the bridge 30 includes a bridge first end 31, and the bridge first end 31 passes through the through hole and protrudes from the through hole 100.

It should be noted that the bridge 30 crosses the hollow cavity and is fixedly connected to the housing, where the fixed connection means that the bridge 30 and the housing do not move relatively.

Specifically, to facilitate the fixing, in one embodiment, the bridge 30 may be fixed to the housing by welding. In another embodiment, the bridge 30 can be fixed to the housing by adhesion. Of course, in other embodiments, the bridge 30 may be fixed to the housing in other manners as long as the bridge 30 can be fixed without relative movement with respect to the housing.

To facilitate the fixed connection of the bridge 30 to the housing, in a specific embodiment, the first end 31 of the bridge is fixedly connected to the sidewall of the through hole 100. Since the first end 31 of the bridge protrudes from the through hole 100, and other areas of the bridge 30 are located inside the housing, the first end 31 of the bridge and the housing can be easily fixed outside the housing.

Of course, with continued reference to FIG. 3 in conjunction with FIG. 1, in another embodiment, the housing has a boss 20 on the inner peripheral wall thereof; the bridge 30 further comprises: a bridge second end 32, said bridge second end 32 supported to said boss 20. In order to achieve a fixed connection of the bridge 30 to the housing, it is also possible to achieve a fixed connection of the bridge second end 32 to said boss 20. The fixing position of the bridge 30 to the housing is not limited, and the bridge 30 may be fixed to the housing as a single body.

Specifically, the protrusion 20 and the through hole 100 may be disposed opposite to each other, ensuring stability of support of the bridge 30. Of course, in other embodiments, the protrusion may be located at other positions as long as it can function to support the bridge.

Further, in order to ensure that the bridge 30 is more stably and fixedly connected to the housing, in a specific embodiment, the first end 31 of the bridge is welded to the housing, and the second end 32 of the bridge is also welded to the housing.

Of course, in order to reduce the welding points, only the first end 31 of the bridge and the housing may be welded and fixed.

As shown in fig. 2, in a specific embodiment, the case further includes a first stopping portion 41 and a second stopping portion 42, where first stopping portion 41 and second stopping portion 42 are symmetrical with respect to a center line where through hole 100 is located, bridge 30 is located below a bottom end of first stopping portion 41 and a bottom end of second stopping portion 42, and both the bottom end of first stopping portion 41 and the bottom end of second stopping portion 42 are in contact with the bridge.

It should be noted that first stopping portion 41 and second stopping portion 42 are symmetrical with respect to a center line of through hole 100, the center line is shown by a dotted line in fig. 1, and the positions of first stopping portion 41 and second stopping portion 42 are different from the positions of through hole 100 and boss 20, that is, first stopping portion 41 and second stopping portion 42 are respectively in contact with other areas of bridge member 30 different from bridge member first end 31 and bridge member second end 32. First stopping portion 41 and second stopping portion 42 may be symmetrical with respect to a vertical plane in which through hole 100 and boss 20 are located.

To further fix bridge 30 and the housing, in a specific embodiment, a bottom end of first stopping portion 41 and a bottom end of second stopping portion 42 may be fixedly connected to bridge 30.

Specifically, bridge 30 may be brought into contact with first stopper portion 41 and second stopper portion 42 by applying a force thereto, or bridge 30 may be directly welded or adhesively fixed to first stopper portion 41 and second stopper portion 42.

With reference to fig. 1 and 2, in a specific embodiment, first blocking portion 41 and second blocking portion 42 are respectively formed by stamping, so that after bridge 30 is assembled to the housing, lower ends of first blocking portion 41 and second blocking portion 42 (taking the placement direction of the roller tappet in fig. 2 as an example) can contact bridge 30 to prevent bridge 30 from moving upward. Of course, in other embodiments, the first stopping portion and the second stopping portion may be fixed on the housing in other manners or in other structures, and it is all right if they can play a role of stopping the upward movement of the bridge.

Referring to fig. 2 and 3, the roller lifter further includes: a plunger (not shown in the figures);

a plunger mating surface 300 is provided on the bottom surface of the bridge 30, the plunger mating surface 300 being adapted to mate with the plunger.

The roller tappet further comprising:

and the roller 50 is arranged in the shell, and the roller 50 is supported on the inner annular surface of the shell.

The roller tappet further comprising:

a pin 60, wherein the roller 50 is supported on the inner ring surface of the shell through the pin 60.

During the operation of the roller tappet, the cam generates a downward acting force on the roller 50, and the pin 60 is supported on the housing through the roller 50, so that the acting force of the cam on the roller 50 is transmitted to the housing through the pin 60, and then the housing transmits the acting force to the bridge 30 fixedly connected with the housing, and the acting force is transmitted to the plunger through the plunger matching surface 300 of the bridge 30, so that the rotation motion of the cam is converted into the reciprocating linear motion of the follower.

It can be seen that, according to the roller tappet provided in the embodiment of the present invention, since the bridge is fixedly connected to the housing, and the bridge is integrated with the housing, on one hand, noise caused by relative movement between the bridge and the housing in the vertical direction can be avoided, so as to improve NVH performance of the tappet; on the other hand, no circumferential relative movement is generated between the housing and the bridge, and the variation value of the roller contact surface of the cam and the tappet can be reduced, and the occurrence of noise can be reduced. It can be seen that, according to the roller tappet provided in the embodiments of the present invention, by fixedly connecting the bridge to the housing, no relative motion is generated between the housing and the bridge, so that the freedom of movement of the bridge is reduced, noise is reduced, and the NVH performance of the tappet is improved. .

In order to solve the above problem, an embodiment of the present invention further provides an assembly method of a roller tappet, where the roller tappet is the above roller tappet; referring to fig. 4 in conjunction with fig. 1 and 3, the assembling method includes the steps of:

step S1: obtaining the bridge and the shell;

the bridge and the housing are used for subsequent assembly of the roller tappet.

Step S2: the bridge 30 is supported to the housing and the bridge 30 traverses the hollow cavity.

The bridge first end 31 passes through the through hole 100 of the housing and protrudes from the through hole 100, and the bridge second end 32 is supported by the protrusion 20 of the inner peripheral wall of the housing, so that the bridge 30 crosses the hollow cavity of the housing and is supported on the housing.

When the bridge 30 is supported on the housing, the bridge 30 can move relatively along the housing, and in order to improve the NVH performance of the housing, the following steps are required:

step S3: fixedly connecting the bridge 30 and the housing.

By fixedly connecting the bridge 30 with the housing, the bridge 30 is integrated with the housing, so that the strength of the tappet is improved in the working process of the tappet, the freedom degree of movement of the bridge 30 is reduced, noise caused by relative movement of the housing and the bridge 30 can be avoided, and the NVH performance of the tappet is improved.

Specifically, referring to fig. 5 in conjunction with fig. 1 and fig. 2, when the housing includes a first stopper and a second stopper, the step of fixedly connecting the bridge 30 and the housing includes:

step S21, applying a force to the bridge 30, so that the bridge 30 contacts with the first stopping portion 41 and the second stopping portion 42 of the housing respectively;

in fact, during the operation of the roller tappet, the cam applies a downward force (downward in fig. 2) to the roller 50, the roller 50 in turn transmits the force to the pin 60 and the housing, the housing transmits the downward force to the bridge 30 due to the contact between the bridge 30 and the first and second stops 41 and 42 of the housing, and at the same time, the plunger mating surface 300 of the bridge 30 cooperates with the plunger, which generates an upward force (upward in fig. 2) to the bridge, and the first and second stops 41 and 42 serve to stop the upward movement of the bridge 30 during the operation. It can be seen that the roller 50 plunger is subjected to both upward and downward forces during actual operation. Then, during the process of assembling bridge 30 and the housing, by applying a force to the bridge so that bridge 30 is in contact with first and second stops 41 and 42 of the housing, respectively, the operating state of the roller tappet can be simulated more realistically.

Step S22, welding or bonding the bridge 30 to the housing.

According to step S21, by applying a downward force to the roller 50 to simulate the force of the cam to the roller 50 and simultaneously applying an upward force to the plunger mating surface 300 of the bridge 30 to simulate the force of the plunger to the bridge 30, the bridge 30 in this state is welded or adhered to the housing when the upper end surfaces of the bridge 30 are respectively in contact with the first and second stoppers 41 and 42 of the housing.

To facilitate the fixed connection of the bridge 30 to the housing, in a specific embodiment, the first end 31 of the bridge is fixedly connected to the sidewall of the through hole 100. Since the first end 31 of the bridge protrudes from the through hole 100, and other areas of the bridge 30 are located inside the housing, the first end 31 of the bridge and the housing can be easily fixed outside the housing.

Of course, in another embodiment, in order to fixedly connect the bridge 30 to the housing, the bridge second end 32 can be fixedly connected to the boss 20. The fixing position of the bridge 30 to the housing is not limited, and the bridge 30 may be fixed to the housing as a single body.

In order to ensure a more stable fixed connection of the bridge 30 to the housing, in a specific embodiment, the first end 31 of the bridge may be welded to the housing, while the second end 32 of the bridge is welded to the housing.

Of course, in order to reduce the welding points, only the first end 31 of the bridge and the housing may be welded.

According to the assembling method of the roller tappet provided by the embodiment of the invention, the bridging piece is fixedly connected with the shell, so that relative motion cannot be generated between the shell and the bridging piece, the moving freedom degree of the bridging piece is reduced, noise is reduced, and the NVH performance of the tappet is improved.

Although the embodiments of the present invention have been disclosed, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.