CN110541738B

CN110541738B - Rocker arm mechanism

Info

Publication number: CN110541738B
Application number: CN201910903791.1A
Authority: CN
Inventors: 叶兵
Original assignee: Chery Automobile Co Ltd
Current assignee: Chery Automobile Co Ltd
Priority date: 2019-09-24
Filing date: 2019-09-24
Publication date: 2021-08-31
Anticipated expiration: 2039-09-24
Also published as: CN110541738A

Abstract

The invention discloses a rocker arm mechanism, and belongs to the field of automobile engines. The rocker arm mechanism comprises a rocker arm and a rocker arm shaft, wherein the rocker arm comprises a rocker arm main body and a roller bearing. The rocker mechanism further comprises a valve core assembly, and the valve core assembly comprises a valve core and an elastic part. According to the invention, different connection states of the rocker arm shaft and the rocker arm are realized through different connection states of the elastic part and the valve core of the valve mechanism, so that the rocker arm cannot normally swing, and the cylinder can be extinguished. The valve actuating mechanism is simple to manufacture and low in manufacturing cost.

Description

Rocker arm mechanism

Technical Field

The invention belongs to the field of automobile engines, and particularly relates to a rocker arm mechanism.

Background

The valve train is the core part of the engine and regulates the flow of combustible gas into and out of the cylinder by controlling the opening and closing of the valve.

When the engine works under a small load, part of cylinders are closed by a cylinder extinguishing technology of a gas distribution system, so that the fuel consumption is effectively reduced on the premise of meeting the power requirement of the engine. In the related art, the cylinder quenching technology is mainly realized through a camshaft displacement technology. The camshaft displacement technology refers to that a plurality of high cams and low cams are arranged on a camshaft at intervals along the axial direction of the camshaft, and the outer diameter of each low cam is smaller than that of each high cam. When the automobile runs under high load, each low-position cam idles, and each high-position cam and all rocker arms are arranged in a one-to-one corresponding mode, so that each rocker arm can drive the cylinder to normally work, and the normal high-load running of the engine can be realized. When the automobile runs at low load, the camshaft moves axially integrally, so that each low-position cam is arranged opposite to part of rocker arms respectively, the part of rocker arms cannot contact the low-position cams due to the fact that the outer diameters of the low-position cams are small, the part of rocker arms do not work, and corresponding cylinders do not work, namely, the cylinders are extinguished. And the high-level cam and the rest part of rocker arms are arranged oppositely, so that the part of rocker arms can drive the cylinder to normally work, and the engine is driven by the part of cylinder to normally work.

However, the cylinder quenching technology needs to process a high-position cam and a low-position cam on the camshaft, and the camshaft is a high-precision structural member, so that the processing difficulty is high, and the manufacturing cost is high.

Disclosure of Invention

The embodiment of the invention provides a rocker arm mechanism which is simple in structure and low in manufacturing cost. The technical scheme is as follows:

the embodiment of the invention provides a rocker arm mechanism, which comprises a rocker arm and a rocker arm shaft, wherein the rocker arm comprises a rocker arm main body and a roller bearing, the roller bearing is installed with the rocker arm main body, a matching part used for being matched with a cam of an automobile is arranged on the outer wall of the roller bearing, the rocker arm shaft is inserted into an inner hole of the roller bearing, and a buffer gap is arranged between the roller bearing and the rocker arm shaft;

the rocker arm mechanism further comprises a valve core assembly, the valve core assembly comprises a valve core and an elastic piece, a sliding groove is arranged on the rocker arm shaft along the radial direction of the rocker arm shaft, the first end of the valve core is slidably inserted into the sliding groove, the first end of the valve core is in sliding fit with the inner wall of the sliding groove, the second end of the valve core is abutted against an inner hole of the roller bearing, the second end of the valve core is arranged towards the matching part, and the elastic piece is clamped between the first end of the valve core and the bottom of the sliding groove;

the chute is in communication with a hydraulic system of the vehicle.

Optionally, a first guide block is arranged on an outer wall of the rocker shaft, an inner hole of the first guide block is coaxially arranged with the chute, and the valve core is slidably inserted into the inner hole of the first guide block.

Optionally, a first positioning block is disposed in the roller bearing, a first protruding block is disposed at the second end of the valve core, and the first protruding block is inserted into the first positioning block.

Optionally, the first positioning block extends axially along the inner hole of the first guide block, and the outer wall of the first positioning block is in sliding fit with the inner hole of the first guide block.

Optionally, a gasket is sleeved on the first bump, and the gasket is clamped between the second end of the valve element and the first positioning block.

Optionally, the elastic member is a spring, a second protrusion is disposed at a first end of the valve core, a third protrusion is disposed at the bottom of the sliding groove, one end of the spring is fixed to the second protrusion, and the other end of the spring is fixed to the third protrusion.

Optionally, a sliding block is arranged on the rocker shaft, a second guide block is arranged on the roller bearing, an inner hole is formed in the second guide block, the sliding block and the second guide block are arranged oppositely, the sliding block is slidably inserted into the inner hole of the second guide block, and the sliding direction of the sliding block is the same as that of the valve core.

Optionally, a fourth boss is disposed at an end of the sliding block facing away from the elastic member, a second positioning block is disposed on the roller bearing, the fourth boss is disposed opposite to the second positioning block, and the fourth boss is slidably inserted into the second positioning block.

Optionally, an oil passage arranged along the axial direction of the rocker shaft is arranged in the rocker shaft, one end of the oil passage is communicated with the chute, and the other end of the oil passage is communicated with a hydraulic system of the automobile.

Optionally, the outer wall of the first end of the valve core is sleeved with a plurality of sealing rings.

The technical scheme provided by the embodiment of the invention has the following beneficial effects:

according to the rocker arm mechanism provided by the embodiment of the invention, the first end of the valve core is inserted into the chute of the rocker arm shaft in a sliding manner, the second end of the valve core is abutted against the inner hole of the roller bearing, and the elastic member is clamped between the first end of the valve core and the bottom of the chute, so that the rocker arm and the rocker arm shaft can be connected through the valve core. When the engine is in a high-load working condition, the hydraulic system injects hydraulic oil into the chute, and the chute is filled with high-pressure hydraulic oil, so that the valve core is tightly and tightly propped against the inner hole of the roller bearing, and the rocker arm shaft are rigidly connected through the valve core, namely the rocker arm, the rocker arm shaft and the valve core can be regarded as a rigid body. When the cam presses the rocker arm, the rocker arm swings along with the cam, so that the valve is driven to open and close, and the air cylinder works normally; when the engine is in a low-load working condition, the hydraulic system stops injecting hydraulic oil into the sliding groove, no high-pressure hydraulic oil exists in the sliding groove, the valve core and the inner hole of the roller bearing are only abutted under the action of the elastic part, and the rocker arm shaft are flexibly connected through the valve core. When the cam presses the rocker arm downwards, the rocker arm can press the valve core downwards, the valve core can further compress the elastic part, namely the rocker arm can move downwards through a buffer gap between the roller bearing and the rocker arm shaft and extrude the elastic part, so that the rocker arm cannot normally swing, the corresponding valve cannot normally open and close, and the cylinder extinguishing of the corresponding cylinder is realized. That is to say, this valve gear need not to change the structure of camshaft, can realize putting out the jar function, and the cost is lower.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic structural diagram of a rocker arm mechanism provided in an embodiment of the present invention;

FIG. 2 is a top view of a rocker mechanism provided by an embodiment of the present invention;

FIG. 3 is a cross-sectional view of a valve cartridge assembly provided by an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a valve body provided in an embodiment of the present invention.

The symbols in the drawings represent the following meanings:

100. a rocker arm; 110. a rocker arm body; 120. a roller bearing; 200. a rocker shaft; 1. a valve core assembly; 11. a valve core; 111. a first bump; 112. a second bump; 12. an elastic member; 13. a chute; 131. a third bump; 14. a first guide block; 15. a first positioning block; 16. a gasket; 17. a slider; 171. a fourth boss; 18. a second guide block; 19. a second positioning block; 2. an oil passage; 3. and (5) sealing rings.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The embodiment of the invention provides a rocker arm mechanism, as shown in fig. 1, the rocker arm mechanism comprises a rocker arm 100 and a rocker arm shaft 200, the rocker arm 100 comprises a rocker arm main body 110 and a roller bearing 120, the roller bearing 120 is mounted with the rocker arm main body 110 (see fig. 2), a matching part for matching with a cam of an automobile is arranged on the outer wall of the roller bearing 120, the rocker arm shaft 200 is inserted into an inner hole of the roller bearing 120, and a buffer gap is arranged between the roller bearing 120 and the rocker arm shaft 200.

Fig. 3 is a cross-sectional view of the valve core assembly provided in the embodiment of the present invention, and as shown in fig. 3, the rocker arm mechanism further includes the valve core assembly 1, the valve core assembly 1 includes a valve core 11 and an elastic member 12, a sliding groove 13 is radially provided on the rocker arm shaft 200 along the rocker arm shaft 200, a first end of the valve core 11 is inserted into the sliding groove 13, the first end of the valve core 11 is in sliding fit with an inner wall of the sliding groove 13, a second end of the valve core 11 abuts against an inner hole of the roller bearing 120, and a second end of the valve core 11 is arranged toward the fitting portion, the elastic member 12 is inserted between the second end of the valve core 11 and the bottom of the sliding groove 13, and the sliding groove 13 is communicated with a hydraulic system of an automobile.

Referring to fig. 3, in the present embodiment, the rocker arm shaft 200 is provided at an outer wall thereof with a first guide block 14, an inner hole of the first guide block 14 is coaxially disposed with the slide groove 13, and the valve body 11 is slidably inserted into the inner hole of the first guide block 14.

In the above embodiment, the first guide block 14 functions to guide the sliding of the valve body 11.

Illustratively, the first guide block 14 and the valve core 11 are both cylindrical structural members, and the first guide block 14 is arranged along the radial direction of the rocker shaft 200. The inner bore of the first guide block 14 is arranged coaxially with the first guide block 14.

Fig. 4 is a schematic structural diagram of a valve body according to an embodiment of the present invention, and as shown in fig. 4, a first protrusion 111 is disposed at a second end of the valve core 11, a first positioning block 15 is disposed in the roller bearing 120, and the first protrusion 111 is inserted into the first positioning block 15.

In the above embodiment, the roller bearing 120 is restrained in the radial direction of the rocker arm shaft 200 by the first positioning block 15 and the first projection 111.

It is easy to understand that the first guide block 14 is disposed on the rocker arm shaft 200, the first positioning block 15 is disposed in the roller bearing 120, and the valve core 11 is fixedly connected with the first protrusion 111, so that the roller bearing 120 is restricted from rotating around the rocker arm shaft 200 in the radial direction of the rocker arm shaft 200 by inserting the first protrusion 111 into the first positioning block 15, thereby reducing friction between the roller bearing 120 and the rocker arm shaft 200 and protecting the roller bearing 120.

Optionally, the first positioning block 15 extends axially along the inner hole of the first guide block 14, and the outer wall of the first positioning block 15 is in sliding fit with the inner hole of the first guide block 14.

In the above embodiment, the outer wall of the first positioning block 15 is in sliding fit with the inner hole of the first guide block 14, so that the first positioning block 15 can slide along the axial direction of the inner hole of the first guide block 14, that is, the first guide block 14 provides a guiding function for the sliding of the first positioning block 15.

Illustratively, the opposing end surfaces of the first locating block 15 and the first guide block 14 are flush, thereby ensuring that the first locating block 15 slides along the inner bore of the first guide block 14 as the cam depresses the roller bearing 120.

Optionally, a gasket 16 is sleeved on the first protrusion 111, and the gasket 16 is sandwiched between the second end of the valve core 11 and the first positioning block 15.

In the above embodiment, the spacer 16 functions to press the damper valve body 11 against the first positioning block 15.

For example, the gasket 16 may be fixed on the upper end surface of the valve core 11 by welding, and in other embodiments, the gasket 16 may also be slidably disposed on the first protrusion 111, which is not limited in the present invention.

Optionally, the elastic member 12 is a spring, the first end of the valve core 11 is provided with a second protrusion 112, the bottom of the sliding groove 13 is provided with a third protrusion 131, one end of the spring is fixed on the second protrusion 112, and the other end of the spring is fixed on the third protrusion 131.

In the above embodiment, the second and

third protrusions

112 and 131 facilitate the fixation of the spring.

Illustratively, the second protrusion 112 and the third protrusion 131 are both cylindrical structural members, one end of the spring is sleeved on the second protrusion 112, and the other end of the spring is sleeved on the third protrusion 131.

Optionally, the rocker arm shaft 200 is provided with a sliding block 17, the roller bearing 120 is provided with a second guide block 18, the second guide block 18 is provided with an inner hole, the sliding block 17 is arranged opposite to the second guide block 18, the sliding block 17 is slidably inserted into the inner hole of the second guide block 18, and the sliding direction of the sliding block 17 is the same as that of the valve core 11.

In the above embodiment, the slide block 17 and the second guide block 18 facilitate the sliding of the roller bearing 120, and guide the sliding of the roller bearing 120.

Illustratively, the sliding block 17 and the second guide block 18 are both cylindrical structural members, and the sliding block 17 and the second guide block 18 are coaxially arranged with the sliding groove 13, thereby facilitating assembly.

Referring to fig. 3 again, one end of the sliding block 17 facing away from the elastic member 12 is provided with a fourth boss 171, the roller bearing 120 is provided with a second positioning block 19, the fourth boss 171 is arranged opposite to the second positioning block 19, and the fourth boss 171 is slidably inserted into the second positioning block 19.

In the above embodiment, the fourth boss 171 and the second positioning block 19 facilitate further restricting the roller bearing 120 from rotating about the rocker shaft 200 in the radial direction of the rocker shaft 200.

The first guide block 14, the first positioning block 15, the valve body 11, the second guide block 18, and the second positioning block 19 are all metal structural members, so that structural strength is increased.

Optionally, the rocker arm shaft 200 is provided with an oil passage 2 arranged along the axial direction of the rocker arm shaft 200, one end of the oil passage 2 is communicated with the sliding chute 13, and the other end of the oil passage 2 is communicated with a hydraulic system of the automobile.

In the above embodiment, the oil gallery 2 facilitates the hydraulic system to inject hydraulic oil into the slide groove 13.

Illustratively, the radial cross-section of the oil passage 2 is arranged at the center of the radial cross-section of the rocker arm shaft 200, thereby avoiding excessive hydraulic oil in the oil passage 2 from deforming the rocker arm shaft 200.

Note that, when a plurality of rocker arms 100 are provided on the rocker arm shaft 200, the oil passage 2 communicates with the sliding groove 13 corresponding to each rocker arm 100.

Optionally, the outer wall of the first end of the valve core 11 is sleeved with a plurality of sealing rings 3.

In the above embodiment, the packing 3 functions to prevent leakage of the hydraulic oil, thereby preventing the valve element 11 from being disabled when the oil is filled into the slide groove 13.

It will be readily appreciated that the valve spool 11 provides a rigid connection between the rocker arm 100 and the rocker arm shaft 200 by the combined action of hydraulic oil pressure, which is the primary motive force, and the spring force of the spring member 12. If the sliding groove 13 has a problem of loose sealing, the pressure of the hydraulic oil in the sliding groove 13 is affected, and the valve element 11 cannot rigidly connect the rocker shaft 200 and the rocker arm 100.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. A rocker arm mechanism comprises a rocker arm (100) and a rocker arm shaft (200), wherein the rocker arm (100) comprises a rocker arm main body (110) and a roller bearing (120), the roller bearing (120) is installed with the rocker arm main body (110), a matching part used for matching with a cam of an automobile is arranged on the outer wall of the roller bearing (120), the rocker arm shaft (200) is inserted into an inner hole of the roller bearing (120), and the rocker arm mechanism is characterized in that a buffer gap is arranged between the roller bearing (120) and the rocker arm shaft (200);

the rocker arm mechanism further comprises a valve core assembly (1), the valve core assembly (1) comprises a valve core (11) and an elastic part (12), a sliding groove (13) is radially arranged on the rocker arm shaft (200) along the rocker arm shaft (200), the first end of the valve core (11) is inserted into the sliding groove (13), the first end of the valve core (11) is in sliding fit with the inner wall of the sliding groove (13), the second end of the valve core (11) is abutted to the inner hole of the roller bearing (120), the second end of the valve core (11) is arranged towards the matching part, and the elastic part (12) is clamped between the first end of the valve core (11) and the bottom of the sliding groove (13);

the chute (13) is in communication with the hydraulic system of the vehicle.

2. The rocker mechanism of claim 1, in which the rocker shaft (200) is provided on its outer wall with a first guide block (14), the inner bore of the first guide block (14) being arranged coaxially with the slide groove (13), the valve element (11) being slidably inserted in the inner bore of the first guide block (14).

3. A rocker mechanism as claimed in claim 2, characterised in that a first locating block (15) is provided in the roller bearing (120), that a first cam (111) is provided at the second end of the valve spool (11), and that the first cam (111) is inserted into the first locating block (15).

4. A rocker mechanism as claimed in claim 3, characterised in that the first locating block (15) extends axially along the internal bore of the first guide block (14), the external wall of the first locating block (15) being in sliding engagement with the internal bore of the first guide block (14).

5. The rocker mechanism according to claim 3, wherein a washer (16) is sleeved on the first protrusion (111), and the washer (16) is sandwiched between the second end of the valve element (11) and the first positioning block (15).

6. A rocker mechanism as claimed in any one of claims 1 to 5, characterised in that the resilient member (12) is a spring, the first end of the valve element (11) is provided with a second projection (112), the bottom of the slide groove (13) is provided with a third projection (131), one end of the spring is fixed to the second projection (112), and the other end of the spring is fixed to the third projection (131).

7. A rocker mechanism as claimed in any one of claims 1 to 5, characterised in that the rocker shaft (200) is provided with a sliding block (17), the roller bearing (120) is provided with a second guide block (18), the sliding block (17) is slidably inserted into an inner bore of the second guide block (18), and the sliding block (17) slides in the same direction as the spool (11).

8. The rocker mechanism according to claim 7, wherein a fourth boss (171) is arranged at an end of the sliding block (17) facing away from the elastic member (12), a second positioning block (19) is arranged on the roller bearing (120), the fourth boss (171) is arranged opposite to the second positioning block (19), and the fourth boss (171) is slidably inserted into the second positioning block (19).

9. The rocker mechanism of any one of claims 1 to 5, wherein the rocker shaft (200) is provided with an oil passage (2) arranged axially along the rocker shaft (200), one end of the oil passage (2) is communicated with the sliding groove (13), and the other end of the oil passage (2) is communicated with a hydraulic system of the automobile.

10. The rocker mechanism according to any of claims 1 to 5, wherein the outer wall of the first end of the valve core (11) is provided with a plurality of sealing rings (3).