Control valve assembly, rocker arm assembly and engine

Abstract

The utility model relates to the technical field of engines, in particular to a control valve assembly, a rocker arm assembly and an engine, which comprises a valve core unit movably arranged in a valve cavity, a limiting unit for limiting the stroke of the valve core unit and a reset elastic piece arranged between the valve core unit and the limiting unit, the limiting unit comprises an elastic check ring clamped in a check ring groove in the cavity wall of the valve cavity and a supporting ring used for being supported on the inner side of the elastic check ring so as to limit the elastic check ring in the check ring groove. According to the control valve assembly, the supporting ring is arranged on the inner side of the elastic check ring, when the elastic check ring is subjected to axial thrust, the elastic check ring has the tendency of deforming to be separated from the check ring groove, at the moment, the supporting ring can support the elastic check ring and prevent the elastic check ring from deforming, the elastic check ring is always clamped in the check ring groove, and therefore the service life of the control valve assembly is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of engines, in particular to a control valve assembly, a rocker arm assembly and an engine. Background Technique

[0002] The rocker arm assembly of an engine generally includes a rocker arm body, a cam assembly for driving the rocker arm body to swing, a piston assembly for intermittently pressing on a valve, and a control valve assembly for controlling the on-off of an oil passage to drive the piston assembly to act intermittently.

[0003] Chinese Patent with application number CN202111079783.3 discloses an in-cylinder braking device for an internal combustion engine with a three-rocker structure, including a control valve body. A control valve spool is elastically assembled in the control valve body. A circlip for hole is arranged at the upper part of the control valve body. A control valve gasket is arranged inside the circlip for hole. A control valve spring is arranged between the control valve gasket and the control valve spool. This solution uses the cooperation of the circlip for hole and the flat gasket to limit the control valve spool. However, when the control valve works, it moves towards the circlip under the fluid pressure, and the spring is gradually compressed, resulting in an increasing pressure on the combined component of the circlip and the gasket, which may cause the circlip to deform and come out of the circlip groove, causing engine failure. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is: to solve the problem that in the control valve assembly in the prior art, the combination of the circlip for hole and the flat gasket is under the hydraulic oil thrust and spring pressure during the operation of the spool for a long time, which may cause the circlip to deform and come out of the circlip groove, resulting in engine failure. Now, a control valve assembly, a rocker arm assembly and an engine are provided.

[0005] To solve the above technical problem, the utility model adopts the following technical scheme: A control valve assembly is installed in the valve cavity of the engine rocker arm assembly to control the on-off of the internal oil passage of the rocker arm assembly. The control valve assembly includes a spool unit movably arranged in the valve cavity, a limiting unit for limiting the stroke of the spool unit, and a reset elastic member arranged between the two and used for driving the spool unit to reset. The limiting unit includes an elastic circlip clamped in a circlip groove on the valve cavity wall and a support ring for supporting inside the elastic circlip to limit the elastic circlip in the circlip groove.

[0006] Further, the support ring includes a support portion supporting inside the elastic circlip. One end of the support portion close to the spool unit protrudes radially to form an abutting portion for abutting against the end face of the elastic circlip.

[0007] Further, the outer wall surface of the support portion is a support surface for supporting the elastic circlip, and the support surface is a cylindrical surface or a conical surface.

[0008] Furthermore, a side of the abutting portion close to the elastic retaining ring is an abutting surface abutting against the elastic retaining ring, and the abutting surface is a plane or a conical surface.

[0009] Furthermore, the elastic retaining ring is a flat retaining ring or a spiral retaining ring.

[0010] Furthermore, the outer diameter of the abutting portion is smaller than the outer diameter of the elastic retaining ring.

[0011] Furthermore, a guiding slope is provided at one end of the support portion away from the valve core unit.

[0012] Furthermore, the thickness of the supporting portion is not less than the thickness of the elastic retaining ring.

[0013] A rocker arm assembly comprises the control valve assembly mentioned above.

[0014] An engine comprises the rocker arm assembly.

[0015] The beneficial effects of the utility model are as follows: the utility model arranges a support ring on the inner side of the elastic retaining ring. When the elastic retaining ring is subjected to axial thrust, it has a tendency to deform and escape from the retaining ring groove. At this time, the support ring can support the elastic retaining ring and prevent its radial deformation, so that it is always stuck in the retaining ring groove, thereby improving the service life of the control valve assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0017] Figure 1 It is a structural schematic diagram of the control valve assembly in a closed state;

[0018] Figure 2 It is a schematic diagram of the structure of the control valve assembly in an open state;

[0019] Figure 3 It is a structural schematic diagram of the rocker arm assembly;

[0020] Figure 4 is a schematic diagram of the structure of the support ring;

[0021] Figure 5 is a cross-sectional view of the support ring;

[0022] In the figure:

[0023] 1. Valve core unit;

[0024] 2. Limiting unit; 201. Elastic retaining ring; 202. Support ring; 2021. Support portion; 2022. Abutment portion; 2023. Support surface; 2024. Abutment surface; 2025. Guide slope;

[0025] 3. Reset elastic member;

[0026] 4. Rocker arm assembly; 401. Valve cavity; 4011. Retaining ring groove. Specific embodiments

[0027] The present utility model will now be described in further detail with reference to the accompanying drawings. These drawings are all simplified schematic diagrams, only illustrating the basic structure of the present utility model in a schematic manner. Therefore, they only show the components related to the present utility model. Directions and references (such as up, down, left, right, etc.) can only be used to assist in the description of the features in the drawings. Therefore, the following specific embodiments are not adopted in a restrictive sense, and the scope of the claimed subject matter is only defined by the appended claims and their equivalents.

[0028] A control valve assembly is installed in the valve cavity 401 of the engine rocker arm assembly 4 to control the on-off of the oil passage inside the rocker arm assembly 4. The rocker arm assembly 4 includes a rocker arm body, a cam assembly for driving the rocker arm body to swing, a piston assembly for intermittently contacting the valve to drive the valve to displace, and the above control valve assembly. When the control valve assembly is opened, the oil passage is conducted to drive the piston rod of the piston assembly to extend. When the control valve assembly is closed, the oil passage is blocked, and the piston rod retracts under the action of the elastic member.

[0029] As Figure 3 shown, the control valve assembly includes a spool unit 1 movably arranged in the valve cavity 401, a limiting unit 2 for limiting the stroke of the spool unit 1, and a return elastic member 3 arranged between the two and used to drive the spool unit 1 to reset. The return elastic member 3 is a spring, one end of which abuts against the spool unit 1, and the other end abuts against the limiting unit 2; Figure 1 is the closed state of the control valve assembly. At this time, the inlet oil pressure is less than the elastic force of the return elastic member 3, and the spool unit 1 resets under the elastic force of the return elastic member 3 to disconnect the oil passage; Figure 2 is the open state of the control valve assembly. At this time, the inlet oil pressure is greater than the elastic force of the return elastic member 3. At this time, the spool unit 1 moves in the direction of the limiting unit 2 against the elastic force of the return elastic member 3 to connect the oil passage.

[0030] The limiting unit 2 includes a snap ring 201 clamped in a snap ring groove 4011 on the wall of the valve cavity 401 and a support ring 202 for supporting inside the snap ring 201 to limit the snap ring 201 in the snap ring groove 4011; when the oil inlet pressure F is greater than the elastic force of the reset elastic member 3, at this time the valve core unit 1 moves towards the limiting unit 2, and the reset elastic member 3 is gradually compressed, and the axial thrust generated on the limiting unit 2 gradually increases. Generally speaking, the snap ring 201 has a relatively small thickness in order to elastically deform in the radial direction, and it is prone to deformation and break out of the snap ring groove 4011 under the axial thrust. In this application, the support ring 202 is arranged inside the snap ring 201. When the snap ring 201 is subjected to the axial thrust, it has a tendency to deform and break out of the snap ring groove 4011, while the support ring 202 with a certain stiffness can support the snap ring 201, block its radial deformation, and make it always clamped in the snap ring groove 4011, thereby improving the service life of the control valve assembly.

[0031] In some examples, such as Figure 4 and Figure 5 as shown, the support ring 202 includes a support portion 2021 supporting inside the snap ring 201. One end of the support portion 2021 close to the valve core unit 1 protrudes radially to form an abutting portion 2022 for abutting against the end face of the snap ring 201. The abutting portion 2022 is located between the snap ring 201 and the valve core unit 1; when the limiting unit 2 is subjected to the axial thrust, the support portion 2021 supports inside the snap ring 201 to limit the snap ring 201 in the snap ring groove 4011. At the same time, the end face of the snap ring 201 abuts against the abutting portion 2022 to limit the abutting portion 2022 in the valve cavity 401 and prevent it from being forced out of the valve cavity 401. Therefore, the support portion 2021 and the abutting portion 2022 cooperate with each other and interact, further improving the stability of the limiting unit 2.

[0032] In some examples, the outer wall surface of the support portion 2021 is a support surface 2023 for supporting the snap ring 201. The support surface 2023 is a cylindrical surface or a conical surface. The conical surface has a large end and a small end, and the large end provides the support function.

[0033] And the gap between the support surface 2023 and the wall of the valve cavity 401 is smaller than the thickness of the snap ring 201 to avoid too large a gap, so that when the snap ring 201 deforms under force and cannot abut against the support surface 2023, the snap ring 201 will break out.

[0034] In some examples, the side of the abutting portion 2022 close to the snap ring 201 is an abutting surface 2024 for abutting against the snap ring 201. The abutting surface 2024 is a plane or a conical surface. The conical surface is more conducive to making the snap ring 201 generate a lateral force and not easy to break out.

[0035] In some examples, the snap ring 201 is a flat snap ring or a spiral snap ring, and the spiral snap ring can be single-layer or multi-layer.

[0036] In some examples, the outer diameter of the abutting portion 2022 is smaller than the outer diameter of the snap ring 201. The outer diameter of the snap ring 201 matches the size of the snap ring groove 4011, and the outer diameter of the abutting portion 2022 matches the size of the valve cavity 401, so as to facilitate the assembly of the limiting unit 2. During installation, first install the valve core unit 1, then push the support ring 202 in, and then push the snap ring 201 in and make it snap into the snap ring groove 4011. Finally, release the support ring 202, and the support ring 202 snaps into the inner side of the snap ring 201 under the elastic force of the return elastic member 3 to support it.

[0037] In some examples, a guiding inclined surface 2025 is provided at one end of the supporting portion 2021 away from the valve core unit 1, and through this guiding inclined surface 2025, it is convenient for the supporting portion 2021 to enter the inner side of the snap ring 201.

[0038] In some examples, the thickness T1 of the supporting portion 2021 is not less than the thickness T2 of the snap ring 201 to provide sufficient support for the snap ring 201.

[0039] In some examples, a rocker arm assembly includes the above-mentioned control valve assembly.

[0040] In some examples, an engine includes the above-mentioned rocker arm assembly.

[0041] Working principle:

[0042] Figure 1 It is the closed state of the control valve assembly. At this time, the inlet oil pressure is less than the elastic force of the return elastic member 3, and the valve core unit 1 is reset under the elastic force of the return elastic member 3 to cut off the oil circuit.

[0043] Figure 2 It is the open state of the control valve assembly. At this time, the inlet oil pressure F is greater than the elastic force of the return elastic member 3, and the valve core unit 1 moves in the direction of the limiting unit 2 against the elastic force of the return elastic member 3. The return elastic member 3 is gradually compressed to generate an axial thrust on the limiting unit 2. The snap ring 201 has a tendency to deform and escape from the snap ring groove 4011. At this time, the supporting portion 2021 with a certain stiffness can support the snap ring 201, block its radial deformation, and make it always snap in the snap ring groove 4011. At the same time, the end face of the snap ring 201 abuts against the abutting portion 2022 to limit the abutting portion 2022 in the valve cavity 401 and prevent it from being forced out of the valve cavity 401. The supporting portion 2021 and the abutting portion 2022 cooperate with each other and interact with each other, further improving the stability of the limiting unit 2, thereby improving the service life of the control valve assembly.

[0044] Based on the above-mentioned ideal embodiments of the present utility model as inspiration, through the above description, relevant staff can completely make various changes and modifications without departing from the technical idea of this utility model. The technical scope of this utility model is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A control valve assembly is installed in the valve cavity (401) of the engine rocker arm assembly (4) to control the on-off of the oil passage inside the rocker arm assembly (4), and is characterized in that: The control valve assembly includes a valve core unit (1) movably arranged in a valve cavity (401), a limiting unit (2) for limiting the stroke of the valve core unit (1), and a reset elastic member (3) arranged between the two and for driving the valve core unit (1) to reset. The limiting unit (2) includes a snap ring (201) clamped in a snap ring groove (4011) on the wall of the valve cavity (401) and a support ring (202) for supporting on the inner side of the snap ring (201) to limit the snap ring (201) in the snap ring groove (4011). The support ring (202) includes a support portion (2021) supporting on the inner side of the snap ring (201). One end of the support portion (2021) close to the valve core unit (1) protrudes radially to form an abutting portion (2022) for abutting against the end face of the snap ring (201).

2. The control valve assembly according to claim 1, wherein: The outer wall surface of the support portion (2021) is a support surface (2023) for supporting the snap ring (201), and the support surface (2023) is a cylindrical surface or a conical surface.

3. The control valve assembly according to claim 1, wherein: One side of the abutting portion (2022) close to the snap ring (201) is an abutting surface (2024) for abutting against the snap ring (201), and the abutting surface (2024) is a plane or a conical surface.

4. A control valve assembly according to claim 1, characterized in that: The snap ring (201) is a flat snap ring or a spiral snap ring.

5. A control valve assembly according to claim 1, characterized in that: The outer diameter of the abutting portion (2022) is smaller than the outer diameter of the snap ring (201).

6. A control valve assembly according to claim 1, characterized in that: A guiding inclined surface (2025) is provided at one end of the support portion (2021) far from the valve core unit (1).

7. A control valve assembly according to claim 1, wherein: The thickness T1 of the support portion (2021) is not less than the thickness T2 of the snap ring (201).

8. A rocker arm assembly, characterized in that: It includes the control valve assembly according to any one of claims 1-7.

9. An engine, characterized in that: It includes the control valve assembly according to any one of claims 1-7.

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