Mechanical system, injection pump and valve actuator comprising such a mechanical system and manufacturing method

Patent metadata

Field	Value
Publication number	US-9551408-B2
Application number	US-201414499989-A
Country	US
Kind code	B2
Filing date	Sep 29, 2014
Priority date	Sep 27, 2013
Publication date	Jan 24, 2017
Grant date	Jan 24, 2017

Abstract

A mechanical system comprising: a tappet, including a body; an insert mounted in the body; a pin extending along a first axis; and a roller element movable in rotation relative to the pin around the first axis. The insert supports the pin, while the body supports the insert, along at least one first direction parallel to a second axis which is perpendicular to the first axis. The mechanical system can be integrated into an injection pump and/or a valve actuator.

First claim

The invention claimed is:

1. A mechanical system, comprising:
a tappet including a body being generally cylindrical in shape, the body extending between an upper edge and a lower edge,
an insert mounted in the body and fixed thereto such that there is no relative movement therebetween,
a pin extending along a first axis, and
a roller element movable in rotation relative to the pin around the first axis,
wherein the insert comprises a first flange and a second flange each having a bore therethrough that are configured to support the pin along the first axis, the first and second flanges of the insert each comprising a lower surface that is configured to abut the upper edge of the body of the tappet such that the body at least partially supports the insert, along at least one first direction which is perpendicular to the first axis.

2. The mechanical system according to claim 1 , wherein the body includes at least one local deformation adapted to prevent the insert from moving along the first direction when the mechanical system is in service.

3. The mechanical system according to claim 1 , the body includes at least one local deformation adapted to prevent the insert from moving along a second direction opposed to the first direction along the second axis when the mechanical system is in service.

4. The mechanical system according to claim 1 , wherein the pin comprises two opposite ends, each supported by one of the two flanges of the insert along at least the first direction.

5. The mechanical system according to claim 1 , wherein the first direction is parallel to a second axis and the body is centered on the second axis.

6. The mechanical system according to claim 1 , wherein the tappet is devoid of any through hole extending between an outer surface and an inner surface of the body.

7. The mechanical system according to claim 1 , further comprising two ribs resting on either side of the ends of the pin for axial retention of the pin along the first axis.

8. The mechanical system according to claim 1 , wherein the insert is clamped inside the body.

9. The mechanical system according to claim 1 , wherein the insert is force-fitted inside the body.

10. The mechanical system according to claim 1 , wherein the insert is mounted with a play inside the body, then fixed to the body, by example by crimping, welding or soldering.

11. The mechanical system according to claim 1 , wherein the body is made of synthetic material, for example of polyamide or polyether-ether-ketone, or made of metal, for example of steel.

12. The mechanical system according to claim 1 , comprising at least one antirotation device integrally formed with the body or with the insert.

13. The mechanical system according to claim 1 , comprising a bearing interposed between the pin and the roller element.

14. The mechanical system according to claim 1 , wherein it constitutes a cam follower, wherein the tappet is movable along the second axis and wherein the roller element is adapted to roll on an outer surface of a cam.

15. An injection pump for a motor vehicle comprising:
a mechanical system, including:
a tappet including a body being generally cylindrical in shape, the body extending between an upper edge and a lower edge,
an insert mounted in the body and fixed thereto such that there is no relative movement therebetween,
a pin extending along a first axis, and
a roller element movable in rotation relative to the pin around the first axis;

wherein the insert comprises a first flange and a second flange each having a bore therethrough that are configured to support the pin along the first axis, the first and second flanges of the insert each comprising a lower surface that is configured to abut the upper edge of the body of the tappet such that the body at least partially supports the insert, along at least one first direction which is perpendicular to the first axis,
wherein the mechanical system is a subassembly integrated into the injection pump.

16. A valve actuator for a motor vehicle comprising:
a mechanical system, including:
a tappet including a body being generally cylindrical in shape, the body extending between an upper edge and a lower edge,
an insert mounted in the body and fixed thereto such that there is no relative movement therebetween,
a pin extending along a first axis, and
a roller element movable in rotation relative to the pin around the first axis;

wherein the insert comprises a first flange and a second flange each having a bore therethrough that are configured to support the pin along the first axis, the first and second flanges of the insert each comprising a lower surface that is configured to abut the upper edge of the body of the tappet such that the body at least partially supports the insert, along at least one first direction which is perpendicular to the first axis,
wherein the mechanical system is a subassembly integrated into the valve actuator.

17. A method for manufacturing a mechanical system comprising steps of:
obtaining components of the mechanical system, the components including:
a tappet including a body being generally cylindrical in shape, the body extending between an upper edge and a lower edge,
an insert comprising a first flange and a second flange each having a bore therethrough, the first and second flanges further comprising a lower surface,
a pin extending along a first axis, and
a roller element;

mounting the insert within the body such that there is no relative movement therebetween and such that the lower surface of the first and second flanges abut the upper edge of the body of the tappet;
assembling the roller element to be movable in rotation relative to the pin around the first axis; and
positioning the pin in the bores of the insert while the insert is positioned in the body.

18. The method for manufacturing a mechanical system according to claim 17 , further comprising a step of:
including at least one local deformation adapted to prevent the insert from moving along the first direction when the mechanical system is in service.

Assignees

• Berruet Nicolas
• Chambonneau Charles
• Hauvespre Benoît
• Viault Samuel
• Skf Ab

Inventors

• Berruet Nicolas
• Chambonneau Charles
• Hauvespre Benoît
• Viault Samuel

Classifications

• F01L2307/00

  Preventing the rotation of tappets · CPC title

• F01L2305/00

  Valve arrangements comprising rollers · CPC title

• Y10T29/49295

  Push rod or rocker arm making · CPC title

• Y10T29/49826

  Assembling or joining · CPC title

• F02M37/06

  mechanically driven · CPC title