CN218882309U

CN218882309U - Valve bridge, rocker arm valve assembly and engine

Info

Publication number: CN218882309U
Application number: CN202223570701.8U
Authority: CN
Inventors: 丁国栋; 马庆镇; 蔡强; 吴建民
Original assignee: Weichai Power Co Ltd
Current assignee: Weichai Power Co Ltd
Priority date: 2022-12-26
Filing date: 2022-12-26
Publication date: 2023-04-18
Anticipated expiration: 2032-12-26

Abstract

The utility model relates to the technical field of engines, in particular to valve bridge, rocking arm valve assembly and engine. The valve bridge includes valve bridge main part, and valve bridge main part is equipped with the recess towards one side of rocking arm, is equipped with piston and elastic component in the recess: one end of the elastic piece is fixed at the bottom of the groove, the other end of the elastic piece is abutted against the piston, and the elastic piece can stretch along the depth direction of the groove so as to drive the piston to move along the depth direction of the groove; when the rocker arm is in a first state, one end of the piston, which is far away from the elastic piece, extends out of the groove and is abutted against the rocker arm, and the elastic piece is in a compressed state; when the rocker arm is in the second state, one end of the piston, which is far away from the elastic piece, is positioned in the groove or is flush with the notch of the groove. The utility model discloses a valve bridge can reduce the noise of strikeing between rocking arm and the valve bridge.

Description

Valve bridge, rocker arm valve assembly and engine

Technical Field

The utility model relates to the technical field of engines, in particular to valve bridge, rocking arm valve assembly and engine.

Background

After the engine is operated for a long time, the valve clearance is gradually increased due to the abrasion of parts such as a camshaft and a rocker arm, and the increase of the valve clearance causes knocking noise of the rocker arm and a valve bridge. Therefore, how to reduce the knocking noise between the rocker arm and the valve bridge is a technical problem to be solved urgently by those skilled in the art.

SUMMERY OF THE UTILITY MODEL

The utility model provides a valve bridge, rocking arm valve assembly and engine for reduce the noise of strikeing between rocking arm and the valve bridge.

In a first aspect, the utility model provides a valve bridge for connect rocking arm and valve bridge, the valve bridge includes the valve bridge main part, valve bridge main part orientation one side of rocking arm is equipped with the recess, be equipped with piston and elastic component in the recess:

one end of the elastic piece is fixed at the bottom of the groove, the other end of the elastic piece is abutted against the piston, and the elastic piece can stretch along the depth direction of the groove so as to drive the piston to move along the depth direction of the groove;

when the rocker arm is in a first state, one end, away from the elastic piece, of the piston is extended out of the groove and abutted against the rocker arm, and the elastic piece is in a compressed state; when the rocker arm is in the second state, one end of the piston, which is far away from the elastic piece, is positioned in the groove or is flush with the notch of the groove.

The utility model provides a valve bridge has set up the recess in the valve bridge main part to set up piston and elastic component in the recess. When the camshaft is on the base circle, the rocker arm is in a first state, at the moment, a part of the piston is located outside the groove, the rocker arm is abutted to the piston, and the elastic piece is in a compression state and exerts acting force on the piston to move reversely. Under the action of the piston and the spring, the rocker arm can be stably contacted with the valve bridge and certain pressure is kept, so that knocking noise between the rocker arm and the valve bridge caused by large valve clearance is reduced. When the camshaft is in the non-base circle position, the rocker arm is in a second state, at which point the rocker arm depresses the piston so that the piston moves inside the recess, the rocker arm and thus the surface of the valve bridge make contact.

Preferably, a limiting device is arranged in the groove and used for limiting the piston to be separated from the groove.

Preferably, the limiting device is a fixing pin, one side of the piston, facing the fixing pin, is provided with a slot, one end of the fixing pin is fixed on the side wall of the groove, and the other end of the fixing pin is located in the slot.

Preferably, the limiting device is a fixing pin, a boss protruding out of the surface of the piston is arranged on one side, facing the fixing pin, of the piston, and one end, close to the piston, of the fixing pin is located on one side, facing away from the elastic piece, of the boss.

Preferably, when the piston is in the first state, the force applied to the piston by the rocker arm is less than the force applied to the valve bridge by the rocker arm to open the valve.

Preferably, the elastic member is a spring.

In a second aspect, the present invention provides a rocker valve assembly comprising a rocker arm, a valve and a valve bridge as defined in any one of the above first aspects.

In a third aspect, the present invention provides an engine comprising a rocker valve assembly as described in the second aspect.

Drawings

FIG. 1 is a schematic view of a valve rocker assembly according to an embodiment of the present invention;

FIG. 2 is a schematic view of one configuration of the cam of FIG. 1;

FIG. 3 is a schematic structural view of a valve bridge according to an embodiment of the present invention;

FIG. 4 is a schematic top view of the valve bridge of FIG. 3;

FIG. 5 is a schematic cross-sectional view of the valve bridge A of FIG. 4;

fig. 6 is an enlarged schematic view of the structure at B in fig. 4.

In the figure:

10-a camshaft; 11-a cam; 111-base circle; 112-exhaust lift; 113-brake lift; 20-a tappet; 30-a push rod; 40-rocker shaft; 50-valve bridge; 51-valve bridge body; 511-grooves; 52-an elastic member; 53-a piston; 54-a stop device; 60-rocker arm; 70-valve.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1 and 2, a rocker arm valve assembly according to an embodiment of the present invention may include a camshaft 10, a tappet 20, a push rod 30, a rocker shaft 40, a rocker arm 60, a valve bridge 50, and two valves 70. The camshaft 10 is provided with a cam 11, and the cam 11 comprises a base circle 111, an exhaust lift 112 and a brake lift 113. One end of the tappet 20 is connected with the cam 11 in a matching way, and the other end is connected with the push rod 30. The rocker arm shaft 40 is provided with a brake oil path which can be opened and closed, and the rocker arm 60 is arranged on the rocker arm shaft 40 and is provided with an oil path communicated with the brake oil path of the rocker arm shaft 40.

Referring to fig. 3 to 6, the valve bridge 50 includes a valve bridge body 51, and a side of the valve bridge body 51 facing the rocker arm 60 is provided with a groove 511, and an elastic member 52 and a piston 53 are provided in the groove 511. One end of the elastic member 52 may be fixed to the bottom of the groove 511, and the other end is connected to the piston 53, and the elastic member 52 may extend and contract along the depth direction of the groove 511, so as to drive the piston 53 to move along the depth direction of the groove 511. The valve bridge body 51 is also provided with an oil chamber, and the oil passage of the rocker arm 60 may communicate with the oil chamber of the valve bridge body 51.

Two valves 70 are connected to the side of the valve bridge 50 facing away from the rocker arm 60, and two valves 40 are located on either side of the valve bridge 50.

When the rocker arm 60 is in the first state, i.e. the camshaft 10 is on the base circle 111, the rocker arm 60 abuts the piston 53, in which case the end of the piston 53 facing away from the spring element 52 is located outside the recess 511. Since the rocker arm 60 has a force on the piston 53 to move the piston 53 toward the elastic member 52, and the elastic member 52 is compressed to form a force to move the piston 53 away from the elastic member 52, the force between the rocker arm 60 and the piston 53 is constant under the action of the piston 53 and the elastic member 52, so that the rocker arm 60 and the valve bridge 50 can be kept stable, and the knocking noise between the rocker arm 60 and the valve bridge 50 can be reduced.

It should be noted that when the rocker arm 60 is in the first state, the force of the rocker arm 60 against the piston 53 is less than the force that would cause the valve 70 to open when the rocker arm 60 acts on the valve bridge 50, thereby preventing the valve 70 from opening at an inappropriate timing.

When the rocker arm 60 is in the second state, i.e., the camshaft 10 is operated to the non-base circle position, the rocker arm 60 depresses the piston 53, so that the piston 53 moves toward the elastic member 52, thereby further compressing the elastic member 52. Also, the end of the piston 53 facing away from the resilient member 52 is located in the recess 511, at which point the rocker arm 60 may contact a surface of the valve bridge body 51.

Since the elastic member 52 is always in a compressed state, when the force of the rocker arm 60 on the piston 53 is reduced, the elastic restoring force of the elastic member 52 may urge the piston 53 to move away from the bottom of the groove 511. To prevent the piston 53 from being removed from the groove 511, a stopper 54 may be provided in the groove 511 to prevent the piston 53 from having an excessive moving stroke.

As an embodiment, the position-limiting means 54 may be a fixing pin, one end of which is fixed to the side of the groove 511. The side of the piston 53 facing the fixing pin may be provided with a slot having a smaller dimension in the depth direction of the groove 511 than the dimension of the piston 53 in the depth direction of the groove 511. Thus, the fixing pin not only limits the piston 53 from being disengaged from the groove 511, but also prevents the elastic member 52 from being excessively compressed, thereby preventing the elastic member 52 from being excessively compressed and losing elasticity.

Alternatively, the side of the piston 53 facing the fixing pin may be provided with a boss protruding from the surface of the piston 53, and the boss may be adjacent to the side of the piston 53 adjacent to the elastic member 53. The retainer pin may be located on the side of the boss facing away from the resilient member 52, and when the plunger 53 moves away from the bottom of the recess 511, the plunger 53 cannot move further when the boss contacts the retainer pin.

Of course, the limiting device 54 may also have other structures, which is not limited in this embodiment.

As an embodiment, the elastic member 52 may be a spring or other force-retractable structure, which is not limited in this embodiment.

Based on the same inventive concept, the present invention may also provide an engine, which may include the rocker arm valve assembly in the above embodiments.

It will be apparent to those skilled in the art that various modifications and variations can be made in the embodiments of the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims

1. The utility model provides a valve bridge for connect rocking arm and valve bridge, its characterized in that, including the valve bridge main part, valve bridge main part orientation one side of rocking arm is equipped with the recess, be equipped with piston and elastic component in the recess:

2. The valve bridge of claim 1 wherein a stop means is provided in the groove for limiting the escape of the piston from the groove.

3. The valve bridge of claim 2 wherein the retainer is a fixed pin, the piston has a slot on a side facing the fixed pin, and the fixed pin has one end fixed to a side wall of the slot and the other end located in the slot.

4. The valve bridge of claim 2 wherein the retainer is a retaining pin, the piston has a boss protruding from the surface of the piston on the side facing the retaining pin, and the retaining pin has an end adjacent to the piston on the side of the boss facing away from the resilient member.

5. The valve bridge of claim 1, wherein the force applied to the piston by the rocker arm when the piston is in the first state is less than the force applied to the valve bridge by the rocker arm to open the valve.

6. The valve bridge of claim 1 wherein the resilient member is a spring.

7. A rocker valve assembly comprising a rocker arm, a valve and a valve bridge as claimed in any one of claims 1 to 6.

8. An engine comprising the rocker arm valve assembly of claim 7.