Engine valve driving device and engine thereof

Abstract

The utility model relates to the technical field of engines, in particular to an engine valve driving device and an engine thereof, which comprise a rocker arm component, a cam component, a piston component and a limiting elastic piece, the rocker arm component comprises a rocker arm body and a mounting structure used for mounting the rocker arm body, and one end of the limiting elastic piece is fixed on the mounting structure to form a fixed section. The other end of the piston assembly is supported at the bottom of the rocker arm body to form a supporting section which is located on the side close to the piston assembly. The limiting elastic piece can elastically deform when the protruding part of the cam makes contact with the rocker arm body and elastically reset to support the rocker arm body when the protruding part is separated from the rocker arm body, so that excessive swing of the rocker arm body is avoided, noise is reduced, meanwhile, the service life of the rocker arm body is prolonged, and the service life of the rocker arm body is prolonged. The limiting elastic piece is arranged between the rocker arm body and the installation structure used for installing the rocker arm body, additional parts do not need to be added, and the overall structure is simple and convenient to install.

Description

Technical Field

[0001] The utility model relates to the technical field of engines, in particular to an engine valve drive device and an engine thereof. Background Art

[0002] A valve drive device generally includes a cam, a rocker arm and a piston. Its working principle is to use the cam to drive the rocker arm to swing reciprocally around the rocker arm shaft, so as to drive the piston to intermittently apply pressure to the valve to drive the valve to open or close. However, during the operation of the engine, vibrations are generated and inertial forces are generated by the rotation of the cam to push the rocker arm, so that the rocker arm sleeved on the swing arm shaft will swing excessively, resulting in increased noise and easy damage to the rocker arm. Summary of the Utility Model

[0003] The technical problem to be solved by the utility model is: to solve the problem that during the operation of the engine in the prior art, vibrations are generated and inertial forces are generated by the rotation of the cam to push the rocker arm, so that the rocker arm sleeved on the swing arm shaft will swing excessively, resulting in increased noise and easy damage to the rocker arm. Now, an engine valve drive device and an engine thereof are provided.

[0004] To solve the above technical problem, the utility model adopts the following technical scheme: an engine valve drive device, comprising:

[0005] A rocker arm assembly, which includes a rocker arm body and an installation structure for installing the rocker arm body;

[0006] A cam assembly for driving the rocker arm body to swing;

[0007] A piston assembly, which is movably installed inside the rocker arm body and intermittently contacts the valve of the engine to drive the valve to displace. The piston assembly and the cam assembly are distributed on both sides of the rocker arm body;

[0008] And a limiting elastic member, one end of which is fixed on the installation structure to form a fixed section, and the other end supports under the rocker arm body to form a supporting section to limit the position of the rocker arm body. The supporting section is located on the side close to the piston assembly.

[0009] Further, the lower surface of the supporting section is recessed to form a contact protrusion on the upper surface that abuts against the rocker arm body.

[0010] Further, the installation structure includes a rocker arm shaft passing through the inside of the rocker arm body and a rocker arm shaft seat for installing the rocker arm shaft. The fixed section is fixed on the rocker arm shaft or the rocker arm shaft seat.

[0011] Further, the limiting elastic member is a metal spring piece. Its fixed section and supporting section are horizontally arranged or obliquely arranged, and there is a transition section between them. And the fixed section, the transition section and the supporting section are transitioned by an arc.

[0012] Further, the number of the limiting elastic members is one or more, and the plurality of limiting elastic members are stacked.

[0013] Further, the abutting protrusion is in an arc shape, a spherical crown shape, a hemispherical shape, a cylindrical shape or a flat boss structure, and the flat boss structure includes an abutting plane and an abutting arc surface connected between the abutting plane and the supporting section.

[0014] Further, the limiting elastic member connecting the fixing section and the rocker arm seat has a bent section formed by bending downward from the fixing section, and the bent section abuts against the side surface of the rocker arm seat.

[0015] Further, a receiving surface for cooperating with the supporting section is provided at the bottom of the rocker arm body.

[0016] Further, the width of the fixing section is greater than the width of the supporting section, and the width of the transition section gradually decreases from the fixing section to the direction of the supporting section.

[0017] An engine includes the above valve driving device.

[0018] The beneficial effects of the present utility model: The limiting elastic member of the present utility model can elastically deform when the convex portion of the cam contacts the rocker arm body, and elastically reset when the convex portion is separated from the rocker arm body to support the rocker arm body, so as to avoid excessive swinging of the rocker arm body, reduce noise and improve the service life of the rocker arm body. Moreover, the limiting elastic member is arranged between the rocker arm body and the mounting structure for mounting the rocker arm body, without adding additional components, and the overall structure is concise and convenient for installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present utility model will be further described below with reference to the drawings and embodiments.

[0020] Figure 1 is a three-dimensional schematic diagram of Embodiment 1 of the present utility model;

[0021] Figure 2 is the front view of Embodiment 1 of the present utility model;

[0022] Figure 3 is the side view of Embodiment 1 of the present utility model;

[0023] Figure 4 is Figure 2 the sectional view taken along the direction A-A in

[0024] Figure 5 is Figure 3 the sectional view taken along the direction B-B in

[0025] Figure 6 is the sectional view of Embodiment 2 of the present utility model;

[0026] Figure 7 It is a schematic structural diagram of two limiting elastic members with spherical crown-shaped abutting protrusions;

[0027] Figure 8 It is a side view of the limiting elastic member with a spherical crown-shaped abutting protrusion;

[0028] Figure 9 It is a top view of the limiting elastic member with a spherical crown-shaped abutting protrusion;

[0029] Figure 10 It is a schematic structural diagram of two limiting elastic members with planar boss structures as the abutting protrusions;

[0030] Figure 11 It is a side view of the limiting elastic member with a planar boss structure as the abutting protrusion;

[0031] Figure 12 It is a top view of the limiting elastic member with a planar boss structure as the abutting protrusion;

[0032] In the figure:

[0033] 1. Valve;

[0034] 2. Rocker arm assembly; 201. Rocker arm body; 2011. Accommodating groove; 2012. Driven part; 2013. Pressing part; 202. Rocker arm shaft; 203. Rocker arm shaft seat;

[0035] 3. Cam assembly;

[0036] 4. Piston assembly;

[0037] 5. Limiting elastic member; 501. Fixed section; 502. Supporting section; 5021. Abutting protrusion; 5021a. Abutting plane; 5021b. Abutting arc surface; 503. Transition section; 504. Bent section;

[0038] 6. Bolt. Detailed implementation manners

[0039] Now, the present utility model will be further described in 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 detailed implementation manners are not adopted in a restrictive sense, and the scope of the claimed subject matter is only defined by the appended claims and their equivalent forms.

[0040] As Figures 1 - 3 shown, an engine valve drive device includes:

[0041] The rocker arm assembly 2 includes a rocker arm body 201 and a mounting structure for mounting the rocker arm body 201. One end of the rocker arm body 201 is a driven part 2012, and the other end is a pressing part 2013;

[0042] The cam assembly 3 is used to drive the rocker arm body 201 to swing. It includes a camshaft and a cam body mounted on the camshaft. The cam body is provided with a base circle part and a protruding part protruding from the base circle part. When the camshaft drives the cam body thereon to rotate synchronously, the cam body is in sliding or rolling fit with the driven part 2012 of the rocker arm body 201, and the base circle part and the protruding part are in contact with the driven part 2012 of the rocker arm body 201 in sequence;

[0043] The piston assembly 4 is movably mounted in the rocker arm body 201 and intermittently contacts the valve 1 of the engine to drive the valve 1 to displace. The cam assembly 3 is opposite to the driven part 2012, and the piston assembly 4 is mounted in the pressing part 2013, that is, the cam assembly 3 and the piston assembly 4 are distributed on both sides of the rocker arm body 201. The pressing part 2013 is provided with a piston hole for mounting the piston assembly 4, and the piston assembly 4 can extend or retract into the piston hole;

[0044] And the limiting elastic member 5, one end of which is fixed on the mounting structure to form a fixed section 501, and the other end supports under the rocker arm body 201 to form a supporting section 502 to limit the position of the rocker arm body 201; when the protruding part on the cam body rotates to contact the rocker arm body 201, it drives the rocker arm body 201 to rotate clockwise. At this time, the pressing part 2013 presses down the supporting section 502 to cause it to elastically deform, and at the same time the piston assembly 4 pushes the valve 1 downward; when the camshaft drives the cam body to continue to rotate until the protruding part disengages from the rocker arm body 201, at this time the supporting section 502 resets to drive the rocker arm body 201 to rotate counterclockwise. At this time, the piston assembly 4 disengages from the valve 1, and the supporting section 502 supports the rocker arm body 201 to limit its position and prevent it from shaking.

[0045] In this embodiment, the limiting elastic member 5 can elastically deform when the protruding part of the cam contacts the rocker arm body 201 and elastically reset when the protruding part disengages from the rocker arm body 201 to support the rocker arm body 201, so as to prevent the rocker arm body from swinging excessively, reduce noise and improve the service life of the rocker arm body 201. Moreover, the limiting elastic member 5 is arranged between the rocker arm body 201 and the mounting structure for mounting the rocker arm body 201, without the need to add additional components, and the overall structure is simple and easy to install.

[0046] In some examples, the lower surface of the supporting section 502 is recessed to form a contact protrusion 5021 that protrudes on the upper surface and abuts against the rocker arm body 201. During the reciprocating swing of the rocker arm body 201, the contact protrusion 5021 is always in contact with the rocker arm body 201, such as Figure 7 andFigure 8 as shown

[0047] In some examples, such as Figure 1 as shown, the mounting structure includes a rocker shaft 202 disposed inside the rocker body 201 and a rocker shaft seat 203 for mounting the rocker shaft 202. The rocker body 201 can swing around the rocker shaft 202 under the action of the cam assembly 3, and the driven part 2012 and the pressing part 2013 are respectively located on both sides of the rocker shaft 202. The fixed section 501 is fixed on the rocker shaft 202 or the rocker shaft seat 203, such as Figure 6 and Figure 7 as shown; in this embodiment, bolts 6 are used for fixing. A through hole for the bolt 6 to pass through is provided on the limiting elastic member 5. The screw of the bolt 6 is sequentially inserted into the through hole of the limiting elastic member 5 and the threaded hole of the rocker shaft 202 (or the rocker shaft seat 203), and the limiting elastic member 5 is clamped between the nut and the rocker shaft 202 (or the rocker shaft seat 203) for fixing.

[0048] In some examples, such as Figure 6 and Figure 7 as shown, the limiting elastic member 5 is a metal shrapnel. The fixed section 501 and the supporting section 502 of the limiting elastic member 5 are horizontally arranged or obliquely arranged, and there is a transition section 503 between them. In this embodiment, the fixed section 501 and the supporting section 502 are preferably horizontally arranged. The horizontal fixed section 501 is convenient for cooperating with the nut of the bolt for fixing, and the horizontal supporting section 502 can hold the rocker body 201 more stably. The fixed section 501, the transition section 503 and the supporting section 502 are transitioned by an arc. The bending structure formed by the three is used for corresponding to the position of the rocker body 201 and the mounting structure on the one hand, and on the other hand, the bending structure can make the supporting section 502 have greater elasticity, which is more conducive to the elastic deformation of the supporting section 502.

[0049] In some examples, the number of the limiting elastic members 5 can be one, two, three, etc. This embodiment does not limit this. In order to ensure the supporting stability of the rocker body 201 and to ensure that it does not break during the repeated swinging of the rocker body 201, the limiting elastic member 5 needs to have a certain thickness. However, a large-thickness limiting elastic member 5 is not easy to bend. Therefore, in this embodiment, it is preferably to stack two limiting elastic members 5. The thickness of a single limiting elastic member 5 is small and convenient for bending. After bending the two limiting elastic members 5 and stacking them, the strength requirements can be met, such as Figure 7 as shown

[0050] In some examples, the abutting protrusion 5021 is in an arc shape, a spherical crown shape, a hemispherical shape, a cylindrical shape or a flat boss structure. The flat boss structure includes an abutting plane 5021a and an abutting arc surface 5021b connected between the abutting plane and the supporting section. The center of the arc shape or the abutting arc surface 5021b, or the center of the spherical crown shape or the hemispherical shape is located on the side of the abutting protrusion 5021 away from the rocker arm body 201, so that while the abutting protrusion 5021 is always in contact with the rocker arm body 201, it is a rolling contact, making the limiting elastic member 5 not easily break under the repeated swinging action of the rocker arm body 201. Therefore, the abutting protrusion 5021 in this embodiment is preferably in an arc shape or a spherical shape, as Figures 7 - 12 shown.

[0051] In some examples, as Figure 5 shown, the limiting elastic member 5 where the fixing section 501 is connected to the rocker arm seat 203 has a bent section 504 formed by bending downward from the fixing section 501. The bent section 504 abuts against the side surface of the rocker arm seat 203, that is, the fixing section 501 and the bent section 504 form a bayonet to clamp the rocker arm seat 203. Combined with the bolt fixation of the fixing section 501 and the rocker arm seat 203, the connection strength between the fixing section 501 and the rocker arm seat 203 can be improved.

[0052] In some examples, as Figure 4 shown, a receiving surface 2011 for cooperating with the supporting section 502 is provided at the bottom of the rocker arm body 201. The receiving surface 2011 can be but is not limited to a plane, an inclined plane or a concave surface, etc. Limiting surfaces for limiting the supporting section 502 are formed on both sides of the receiving surface 2011 to prevent it from shifting during the repeated swinging of the rocker arm body 201.

[0053] In some examples, as Figure 9 shown, the width H1 of the fixing section 501 is greater than the width H2 of the supporting section 502. On the one hand, the supporting section 502 with a small width matches the groove width of the receiving groove 2011. On the other hand, the supporting section 502 with a small width has better elastic deformation ability, and the fixing section 501 with a large width has higher structural strength. The width of the transition section 503 gradually decreases from the fixing section 501 to the direction of the supporting section 502.

[0054] In some examples, an engine includes the above valve drive device.

[0055] Working principle:

[0056] During the rotation of the camshaft driving the cam body, when the protruding portion rotates to contact the follower portion 2012 of the rocker arm body 201, it drives the rocker arm body 201 to rotate clockwise. At this time, the pressing portion 2013 presses down the supporting section 502 to cause it to elastically deform, and at the same time, the piston assembly 4 pushes the valve 1 downward; when the camshaft drives the cam to continue rotating until the protruding portion disengages from the rocker arm body 201, at this time, the supporting section 502 resets to drive the rocker arm body 201 to rotate counterclockwise. At this time, the piston assembly 4 disengages from the valve 1, and the supporting section 502 supports the rocker arm body 201 to limit its position and prevent it from shaking.

[0057] Inspired by the above ideal embodiments of the present invention, through the above description, relevant staff can completely make various changes and modifications without departing from the technical idea of this invention. The technical scope of this invention 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. An engine valve drive device, characterized in that: Comprising: A rocker arm assembly (2), which includes a rocker arm body (201) and a mounting structure for mounting the rocker arm body (201); A cam assembly (3) for driving the rocker arm body (201) to swing; A piston assembly (4), which is movably installed inside the rocker arm body (201) and intermittently contacts the valve (1) of the engine to drive the valve (1) to displace. The piston assembly (4) and the cam assembly (3) are distributed on both sides of the rocker arm body (201); And a limiting elastic member (5), one end of which is fixed to the mounting structure to form a fixed section (501), and the other end supports under the rocker arm body (201) to form a supporting section (502) to limit the position of the rocker arm body (201). The supporting section (502) is located on the side close to the piston assembly (4).

2. The engine valve drive device according to claim 1, characterized in that: The lower surface of the supporting section (502) is recessed to form a contact protrusion (5021) that protrudes on the upper surface and abuts against the rocker arm body (201).

3. The engine valve drive device according to claim 1, characterized in that: The mounting structure includes a rocker arm shaft (202) inserted inside the rocker arm body (201) and a rocker arm shaft seat (203) for mounting the rocker arm shaft (202). The fixed section (501) is fixed to the rocker arm shaft (202) or the rocker arm shaft seat (203).

4. An engine valve drive device according to claim 1, characterized in that: The limiting elastic member (5) is a metal spring piece. Its fixed section (501) and supporting section (502) are horizontally arranged or inclined, and there is a transition section (503) between them. And the fixed section (501), the transition section (503) and the supporting section (502) are transitioned by an arc.

5. An engine valve drive device according to claim 1, characterized in that: The number of the limiting elastic members (5) is one or more, and multiple limiting elastic members (5) are stacked.

6. The engine valve drive device according to claim 2, wherein: The contact protrusion (5021) is in an arc shape, a spherical crown shape, a hemispherical shape, a cylindrical shape or a flat convex platform structure. The flat convex platform structure includes a contact plane (5021a) and a contact arc surface (5021b) connected between the contact plane (5021a) and the supporting section (502).

7. An engine valve drive device according to claim 3, characterized in that: The limiting elastic member (5) connecting the fixed section (501) and the rocker arm shaft seat (203) has a bent section (504) formed by bending downward from the fixed section (501), and the bent section (504) abuts against the side surface of the rocker arm shaft seat (203).

8. An engine valve drive device according to claim 1, characterized in that: A receiving surface (2011) for cooperating with the supporting section (502) is provided at the bottom of the rocker arm body (201).

9. An engine valve drive device according to claim 4, characterized in that: The width of the fixed section (501) is greater than the width of the supporting section (502), and the width of the transition section (503) gradually decreases from the fixed section (501) to the direction of the supporting section (502).

10. An engine, comprising the engine valve driving device according to any one of claims 1-9.

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