Rocker arm

Patent metadata

Field	Value
Publication number	US-10961876-B2
Application number	US-201716300593-A
Country	US
Kind code	B2
Filing date	Apr 21, 2017
Priority date	May 12, 2016
Publication date	Mar 30, 2021
Grant date	Mar 30, 2021

Abstract

A rocker arm for a valve train assembly includes: a first body; a second body mounted for pivotal movement with respect to the first body; and a latching arrangement. The latching arrangement includes a latch pin drivable in response to an external actuator from a first position in which the first body and the second body are un-latched to a second position in which the latch pin latches the first body and the second body together. The latching arrangement includes a piston member and a first biasing member. The piston member is arranged such that if the external actuator attempts to cause the latch pin to be driven from the first position to the second position at a time when the latch pin is prevented from being driven, the piston member moves to bias the biasing member so that the biasing member urges the latch pin to the second position.

First claim

The invention claimed is:

1. A rocker arm for a valve train assembly, the rocker arm comprising:
a first body;
a second body mounted for pivotal movement with respect to the first body; and
a latching arrangement comprising a latch pin drivable in response to an external actuator from a first position in which the first body and the second body are un-latched to a second position in which the latch pin latches the first body and the second body together,
wherein the latching arrangement further comprises a piston member and a first biasing member,
wherein the piston member is configured such that if the external actuator attempts to cause the latch pin to be driven from the first position to the second position at a time when the latch pin is prevented from being driven, the piston member moves to bias the biasing member so that the biasing member urges the latch pin to the second position when the latch pin again becomes driveable,
wherein one of the first and second body comprises a bore or channel,
wherein the latch pin and the first biasing member are at least partially mounted within the bore or channel, and
wherein an end of the latch pin extends into the piston member and the piston member contains the first biasing member.

2. The rocker arm according to claim 1 , wherein the piston member is at least partially within the bore or channel.

3. The rocker arm according to claim 1 , wherein the bore or channel comprises a first section configured to receive at least a first part of the latching pin that comprises a latching surface and a second section configured to receive at least a part of the piston member.

4. The rocker arm according to claim 3 , wherein the second section of the bore or channel is wider than the first section of the bore.

5. The rocker arm according to claim 1 , wherein the rocker arm further comprises a return spring configured to bias the latch pin to the first position.

6. The rocker arm according to claim 1 , wherein the piston member is at least partially within the bore or channel and a part of the piston member extends out of the bore or channel to enable the external actuator to act on the piston member.

7. The rocker arm according to claim 1 , wherein the piston member comprises a retaining member on the end of the latch pin, the retaining member being configured to retain the first biasing member.

8. The rocker arm according to claim 7 , wherein the retaining member is configured to limit an extent to which the piston member can extend out of the bore or channel.

9. The rocker arm according to claim 1 , wherein an end of the latch pin defines a latch pin bore and the piston member is at least partially in the latch pin bore.

10. The rocker arm according to claim 9 , wherein the first biasing member is arranged at least partially within the latch pin bore.

11. The rocker arm according to claim 10 , wherein the first biasing member is also at least partially within the piston member.

12. The rocker arm according to claim 1 , wherein the piston member comprises an aperture through which an end of the latch pin extends whereby the piston member is slidably mounted on the latch pin.

13. The rocker arm according to claim 12 , wherein the first biasing member is arranged around the piston member and around the end of the latch pin.

14. The rocker arm according to claim 13 , further comprising a retainer mounted on the end of the latch pin opposing the piston member,
wherein the retainer is configured to retain the first biasing member and the first biasing member is between the retainer and the piston member.

15. A valve train assembly comprising the rocker of claim 1 .

Assignees

• Eaton Intelligent Power Ltd

Inventors

• Andrisani Nicola
• Raimondi Emanuele
• Lorenzon Alessio

Classifications

• F01L2001/186

  Split rocking arms, e.g. rocker arms having two articulated parts and means for varying the relative position of these parts or for selectively connecting the parts to move in unison · CPC title

• F01L13/0036 Primary

  the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction · CPC title

• F01L13/0005 Primary

  Deactivating valves · CPC title

• F01L1/18 Primary

  Rocking arms or levers · CPC title

• F01L1/46

  Component parts, details, or accessories, not provided for in preceding subgroups · CPC title