CN209875351U - Tappet assembly for a high-pressure oil pump and corresponding high-pressure oil pump - Google Patents
Tappet assembly for a high-pressure oil pump and corresponding high-pressure oil pump Download PDFInfo
- Publication number
- CN209875351U CN209875351U CN201920658281.8U CN201920658281U CN209875351U CN 209875351 U CN209875351 U CN 209875351U CN 201920658281 U CN201920658281 U CN 201920658281U CN 209875351 U CN209875351 U CN 209875351U
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- China
- Prior art keywords
- plunger
- tappet
- tappet assembly
- pressure oil
- oil pump
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- 239000000463 material Substances 0.000 claims abstract description 8
- 230000009467 reduction Effects 0.000 claims abstract description 4
- 239000000919 ceramic Substances 0.000 claims description 3
- 239000000446 fuel Substances 0.000 description 6
- 230000007246 mechanism Effects 0.000 description 6
- 230000033001 locomotion Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Abstract
Disclosed is a tappet assembly (12) for a high-pressure oil pump, wherein the high-pressure oil pump comprises a plunger pump (2), the tappet assembly (12) is in contact with a plunger (22) of the plunger pump (2) in an assembled state, and a lateral friction force reducing structure adapted to reduce a lateral friction force between the plunger (22) and the tappet assembly (12) based on a reduction in a material friction coefficient is provided at a contact area between the plunger (22) and the tappet assembly (12). A high-pressure oil pump comprising such a tappet assembly (12) is also disclosed. According to the utility model discloses, high-pressure oil pump can operate more reliably.
Description
Technical Field
The utility model relates to a tappet subassembly and a corresponding high-pressure oil pump for high-pressure oil pump.
Background
The high-pressure oil pump of the engine is used for pressurizing fuel from low pressure to high pressure and then delivering the pressurized fuel to the common rail. At present, the high-pressure oil pump is widely in a plunger pump mode. The plunger pump realizes oil absorption and oil pressing by means of the volume periodic change of the sealed working cavity through the reciprocating motion of the plunger in the plunger sleeve. The plunger pump has the advantages of high rated pressure, compact structure, high efficiency, convenient flow regulation and the like.
In current high pressure oil pumps, the plunger is typically driven in motion by a cam drive mechanism. The cam driving mechanism comprises a cam shaft and a tappet assembly, the tappet assembly reciprocates under the action of the cam shaft, the tappet assembly is in contact with one end of the plunger, and then the plunger can be driven to reciprocate.
However, in practice it has been found that the contact area between the tappet assembly and the plunger presents lateral friction forces which may adversely affect the normal operation of the high pressure oil pump, in particular which may cause the plunger to become stuck in the plunger sleeve.
Therefore, there is a strong need for improvements to existing high pressure oil pumps, particularly tappet assemblies, to improve operational reliability.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a high-pressure oil pump that is used for tappet subassembly of high-pressure oil pump and includes this kind of tappet subassembly.
Therefore, according to a first aspect of the present invention, a tappet assembly for a high pressure oil pump is provided, wherein the high pressure oil pump comprises a plunger pump, the tappet assembly being in contact with a plunger of the plunger pump in an assembled state, a lateral friction force reducing structure adapted to reduce a lateral friction force between the plunger and the tappet assembly based on a reduction of a material friction coefficient being provided at a contact area between the plunger and the tappet assembly.
According to an optional embodiment of the present invention, the lateral friction reducing structure is provided on at least one of the plunger and the tappet assembly.
According to an optional embodiment of the present invention, the tappet assembly includes a tappet body and a tappet roller rotatably installed on the tappet body, the lateral friction force reducing structure is provided on the tappet body.
According to an alternative embodiment of the invention, the lateral friction reducing structure is configured as an insert insertedly fixed to the tappet body.
According to an optional embodiment of the present invention, the insert is a ceramic insert.
According to an alternative embodiment of the invention, the exposed surface of the insert is at least as large as the contact end surface of the plunger so that the plunger is always in contact with the exposed surface.
According to an alternative embodiment of the invention, the exposed surface is circular.
According to an alternative embodiment of the invention, the insert is configured as a cylinder.
According to an alternative embodiment of the invention, the exposed surface is a flat surface; and/or the exposed surface is at least flush with a portion of the tappet body adjacent the insert.
According to a second aspect of the present invention, a high-pressure oil pump is provided, wherein the high-pressure oil pump comprises a tappet assembly as described above.
According to the utility model discloses, can reduce side direction frictional force to make high-pressure oil pump work more reliably.
Drawings
The principles, features and advantages of the present invention may be better understood by describing the invention in more detail below with reference to the accompanying drawings. The drawings comprise:
fig. 1 shows a side sectional view of a high-pressure oil pump according to an exemplary embodiment of the present invention.
Fig. 2 shows a detail of the tappet assembly region of the high-pressure oil pump from fig. 1.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings and a plurality of exemplary embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the scope of the invention.
Fig. 1 shows a side sectional view of a high-pressure oil pump according to an exemplary embodiment of the present invention.
As shown in fig. 1, the high-pressure oil pump includes a cam drive mechanism 1 and a plunger pump 2 driven by the cam drive mechanism 1. More specifically, the cam driving mechanism 1 includes a cam shaft 11 and a tappet assembly 12, and the plunger pump 2 includes a plunger sleeve 21 and a plunger 22 reciprocating in the plunger sleeve 21. The oil feed valve 3 is provided above the plunger 22 in the plunger barrel 21 to draw fuel to be pressurized from a low-pressure fuel pump (not shown). The oil outlet valve 4 is provided adjacent to the oil inlet valve 3 to deliver the fuel pressurized by the plunger pump 2 to a common rail (not shown).
The tappet assembly 12 is disposed between the camshaft 11 and the plunger 22. Specifically, the tappet assembly 12 is disposed between the camshaft 11 and an end portion of the plunger 22 adjacent to the camshaft 11, i.e., the bottom portion 221. When the camshaft 11 is driven to rotate by a driving device (not shown), such as an electric motor, the rotation of the camshaft 11 causes the tappet assembly 12 to linearly reciprocate, and the linear reciprocating movement of the tappet assembly 12 causes the plunger 22 to reciprocate in the plunger sleeve 21, so that the suction and pressurization of fuel can be realized. The tappet assembly 12 can be reset under the action of the spring 5.
During operation, lateral friction may be generated by contact of the bottom 221 of the plunger 22 with a corresponding portion of the tappet assembly 12. Such lateral friction is highly undesirable and may, for example, cause the plunger 22 to become jammed within the plunger sleeve 21, or at least one of the reasons why the plunger 22 becomes jammed within the plunger sleeve 21. Therefore, there is a need to reduce this lateral friction.
According to an exemplary embodiment of the present invention, the contact area between the bottom 221 of the plunger 22 and the tappet assembly 12 is provided with a lateral friction force reducing structure adapted to reduce the lateral friction force due to a reduction of the material friction coefficient.
According to an exemplary embodiment of the present invention, the contact area of at least one of the bottom 221 of the plunger 22 and the tappet assembly 12 is at least partially provided with a lateral friction reducing structure. It will be apparent to those skilled in the art that the lateral friction force can be reduced to some extent by locally providing the lateral friction force reducing structure.
As shown in fig. 1, the tappet assembly 12 generally includes a tappet body 121 and a tappet roller 122 rotatably mounted on the tappet body 121, wherein the tappet roller 122 is in contact with the camshaft 11, and a side of the tappet body 121 facing away from the tappet roller 122 is in contact with a bottom 221 of the plunger 22.
According to an exemplary embodiment of the present invention, the lateral friction force reducing structure is configured as an insert provided at a corresponding portion of at least one of the bottom 221 of the plunger 22 and the tappet body 121.
As shown in fig. 1, the insert 123 is embedded in the tappet body 121 and may be considered as a part of the tappet body 121. For this purpose, a recess 124 is provided in the tappet body 121, and the insert 123 is inserted into said recess 124. In this case, it is not necessary to make the tappet body 121 entirely of a material having a low friction coefficient, so that the material of the insert 123 can be flexibly selected.
The insert 123 may be made of a material having a relatively low coefficient of friction, such as ceramic. For those skilled in the art, the relatively low coefficient of friction is primarily referred to relative to the material of the remainder of tappet body 121.
FIG. 2 shows an enlarged partial view of the area near the tappet assembly 12, which more clearly shows the placement of the insert 123.
According to an exemplary embodiment of the present invention, the exposed surface of the insert 123 exposed from the tappet body 121 is at least as large as the contact end surface of the bottom 221 of the plunger 22 so that the plunger 22 is always in contact with the exposed surface, as shown in fig. 2. Thus, the entire contact area can be made to have a low friction coefficient.
According to an exemplary embodiment of the present invention, the exposed surface of the insert 123 is circular.
According to an exemplary embodiment of the present invention, the insert 123 is configured to be cylindrical. It is obvious to those skilled in the art that the shape of the insert 123 is not limited thereto, and particularly, the portion to be inserted into the tappet body 121 can be flexibly selected according to the circumstances.
According to an exemplary embodiment of the present invention, the exposed surface of the insert 123 is a flat surface, and is preferably at least flush with the portion of the tappet body 121 adjacent to the insert 123, as shown in fig. 2.
Moreover, other advantages and alternative embodiments of the present invention will be apparent to those skilled in the art. Therefore, the invention in its broader aspects is not limited to the specific details, representative structures, and illustrative examples shown and described. On the contrary, various modifications and substitutions may be made by those skilled in the art without departing from the basic spirit and scope of the invention.
List of reference numerals
1 cam driving mechanism
2 plunger pump
11 camshaft
12 tappet assembly
21 plunger sleeve
22 plunger
3 oil inlet valve
4 oil outlet valve
221 bottom
5 spring
121 tappet body
122 tappet roller
123 insert
124 groove
Claims (10)
1. A tappet assembly (12) for a high-pressure oil pump, wherein the high-pressure oil pump comprises a plunger pump (2), the tappet assembly (12) being in contact with a plunger (22) of the plunger pump (2) in an assembled state,
a lateral friction force reducing structure adapted to reduce a lateral friction force between the plunger (22) and the tappet assembly (12) based on a reduction in a material friction coefficient is provided at a contact area between the plunger (22) and the tappet assembly (12).
2. The tappet assembly (12) of claim 1,
the lateral friction reducing structure is disposed on at least one of the plunger (22) and the tappet assembly (12).
3. The tappet assembly (12) of claim 1 or 2,
the tappet assembly (12) comprises a tappet body (121) and a tappet roller (122) rotatably mounted on the tappet body (121), and the lateral friction force reducing structure is arranged on the tappet body (121).
4. The tappet assembly (12) of claim 3,
the lateral friction force reducing structure is configured as an insert (123) insertedly fixed on the tappet body (121).
5. The tappet assembly (12) of claim 4,
the insert (123) is a ceramic insert.
6. The tappet assembly (12) of claim 4 or 5,
the exposed surface of the insert (123) is at least as large as the contact end face of the plunger (22) so that the plunger (22) is always in contact with the exposed surface.
7. The tappet assembly (12) of claim 6,
the exposed surface is circular.
8. The tappet assembly (12) of claim 7,
the insert (123) is configured in a cylindrical manner.
9. The tappet assembly (12) of claim 6,
the exposed surface is a flat surface; and/or
The exposed surface is flush with at least a portion of the tappet body (121) adjacent to the insert (123).
10. A high-pressure oil pump, characterized in that it comprises a tappet assembly (12) according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920658281.8U CN209875351U (en) | 2019-05-09 | 2019-05-09 | Tappet assembly for a high-pressure oil pump and corresponding high-pressure oil pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920658281.8U CN209875351U (en) | 2019-05-09 | 2019-05-09 | Tappet assembly for a high-pressure oil pump and corresponding high-pressure oil pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209875351U true CN209875351U (en) | 2019-12-31 |
Family
ID=68965017
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920658281.8U Active CN209875351U (en) | 2019-05-09 | 2019-05-09 | Tappet assembly for a high-pressure oil pump and corresponding high-pressure oil pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209875351U (en) |
-
2019
- 2019-05-09 CN CN201920658281.8U patent/CN209875351U/en active Active
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