CN112412564B

CN112412564B - Engine and valve device thereof

Info

Publication number: CN112412564B
Application number: CN202011296781.5A
Authority: CN
Inventors: 唐江; 张巧; 杨建华
Original assignee: Loncin Motor Co Ltd
Current assignee: Loncin Motor Co Ltd
Priority date: 2020-11-18
Filing date: 2020-11-18
Publication date: 2022-07-12
Anticipated expiration: 2040-11-18
Also published as: CN112412564A

Abstract

The invention discloses a valve device of an engine, which comprises a valve, a valve spring seat and a spring, wherein the valve spring seat is provided with a groove, the bottom of the groove is provided with a through hole, the valve is provided with a neck part with the size smaller than that of a head part, the neck part is penetrated through the through hole, the spring acts on the valve spring seat to clamp the head part in the groove, and at least part of the contact surface of the head part and the bottom of the groove is a transition surface with height difference in the axial direction of the valve. By applying the valve device of the engine, under the condition that the sizes of the valve and the valve spring seat are the same as those of the conventional structure, the contact surface area of the valve and the valve spring seat is increased, so that the surface pressure applied to the valve spring seat is reduced, the abrasion of the valve spring seat is further reduced, the sizes of the valve head and the valve spring seat are not required to be increased, and the cost of the valve spring seat is not additionally increased. The invention also discloses an engine with the valve device, and the engine also has the technical effects.

Description

Engine and valve device thereof

Technical Field

The invention relates to the technical field of power equipment, in particular to an engine and a valve device of the engine.

Background

Valve devices of general engines have various forms, among which there are valve devices including a valve, a valve spring seat, and a spring. The kinetic energy of the valve opening and closing mainly comes from the acting force of the spring, so that the valve spring seat can be repeatedly impacted by the spring in the running process of the engine, and the valve spring seat and the matched valve head are also repeatedly impacted.

Referring to fig. 1, fig. 1 is a partial structural diagram of a conventional engine valve device. The forced cross section between prior art's valve spring holder and the valve head is the right angle shape face, and its main stress face is in the radial direction of valve, along with the increase of the engine operation overall length of time, and the main stress face between valve spring holder and the head constantly wears, finally probably leads to valve spring holder to deviate from the draw-in groove and become invalid, the valve landing makes the engine damage.

If the problem that the long-time main stress surface is seriously abraded is solved, the width of the stress surface needs to be increased in the radial direction, or the hardness of the main stress surface of the valve spring seat needs to be increased, or the material of the main stress surface of the valve spring seat needs to be changed, but the sizes of the valve head and the valve spring seat can be increased, or the cost of the valve spring seat can be increased.

In summary, how to solve the problem of serious abrasion of the main stress surface for a long time on the premise of not increasing the sizes of the valve head and the valve spring seat and the cost of the valve spring seat is the problem to be solved by the technical personnel in the field at present.

Disclosure of Invention

In view of the above, a first object of the present invention is to provide a valve device of an engine, which has a structural design that can effectively solve the problem of serious abrasion of a main bearing surface for a long time on the premise of not increasing the sizes of a valve head and a valve spring seat and the cost of the valve spring seat, and a second object of the present invention is to provide an engine including the valve device.

In order to achieve the first object, the invention provides the following technical scheme:

the utility model provides a valve gear of engine, includes valve, valve spring seat and spring, the recess has on the valve spring seat, the tank bottom of recess has the through-hole, the valve has the neck that the size is less than head size, the neck wears to locate the through-hole, the spring action in the valve spring seat is so that the head card is located in the recess, the head with at least part of the contact surface of recess tank bottom is in the transition face that has the difference in height in the axial of valve.

Preferably, in the above valve device of an engine, the transition surface includes an inclined surface inclined from bottom to top from inside to outside.

Preferably, in the valve device of an engine, an inclination angle of the inclined surface ranges from 30 ° to 60 °.

Preferably, in the valve device of the engine, the inclined surface is a conical surface.

Preferably, in the above-described valve device for an engine, an axis of the conical surface is collinear with an axis of the valve.

Preferably, in the valve device of the engine, the neck portion is in clearance fit with the through hole.

Preferably, the valve device of the engine further includes a valve adjusting cap, and the valve adjusting cap is mounted outside the head of the valve and forms a close fit with the valve spring seat.

The invention provides a valve device of an engine, which comprises a valve, a valve spring seat and a spring. The valve spring seat is provided with a groove, the bottom of the groove is provided with a through hole, the valve is provided with a neck with the size smaller than that of the head, and the neck penetrates through the through hole; the spring acts on the valve spring seat to enable the head to be clamped in the groove, and at least part of a contact surface between the head and the bottom of the groove is a transition surface with a height difference in the axial direction of the valve.

When the valve device of the engine provided by the invention is applied, the valve moves up and down when the engine works, and because at least part of the contact surface between the valve head and the groove bottom of the groove is a transition surface with a height difference in the axial direction of the valve, the contact surface area of the valve and the valve spring seat is increased under the condition that the valve and the valve spring seat have the same size as the conventional structure, so that the surface pressure on the valve spring seat is reduced, the abrasion of the valve spring seat is further reduced, the sizes of the valve head and the valve spring seat are not required to be increased, and the cost of the valve spring seat is not additionally increased. In conclusion, the valve device of the engine provided by the invention has the advantages of more reasonable structure, more reliable work, no change in assembly mode and no increase in assembly difficulty.

In order to achieve the second object, the present invention also provides an engine including any one of the above valve devices. Because the valve device has the technical effects, the engine with the valve device also has the corresponding technical effects.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a schematic illustration of a portion of a prior art engine valve arrangement;

FIG. 2 is a schematic illustration of a portion of a valve gear of an engine according to an embodiment of the present invention;

FIG. 3 is an enlarged view of portion A of FIG. 2;

FIG. 4 is an exploded view of the valve spring retainer and valve;

fig. 5 is a schematic view showing the entire installation of the valve gear of the engine.

The drawings are numbered as follows:

the valve comprises a valve 1, a valve spring seat 2, a valve rocker assembly 3, a valve adjusting cap 4, a spring 5, an oil baffle cover 6, a cylinder head 7, a tappet 8, a tappet 9, a contact surface 10, a head 11, a groove 21 and a through hole 22.

Detailed Description

The embodiment of the invention discloses a valve device of an engine, and provides the valve device which can reduce impact and abrasion between a valve spring seat and a clamping groove and properly restrict axial swing of the valve spring seat and the engine with the valve device under the conditions that the sizes of the valve head and the valve spring seat are not increased and the cost of the conventional valve spring seat is maintained.

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 2 to 4, fig. 2 is a partial structural view of a valve device of an engine according to an embodiment of the present invention; FIG. 3 is an enlarged view of the portion of FIG. 2A; fig. 4 is an exploded view of the valve spring seat and valve.

In one embodiment, the present invention provides a valve gear of an engine including a valve 1, a valve spring seat 2, and a spring 5.

Wherein, have recess 21 on the valve spring seat 2, the tank bottom of recess 21 has through-hole 22, and valve 1 has the neck that the size is less than head 11 size, and the neck is worn to locate in through-hole 22, and spring 5 acts on valve spring seat 2 so that head 11 card locates in the recess 21. The valve spring seat 2 is matched with the valve 1, and the assembling relation of the valve spring seat 2 and the valve 1 is the same as that of the conventional valve 1 and the valve spring seat 2, namely, the head part 11 of the valve 1 is clamped in the groove 21 of the valve spring seat 2. Specifically, the groove bottom of the groove 21 in the valve spring seat 2 provides an abutting limit function for the valve 1, and the valve 1 has a neck portion with a small size, so that a step surface formed between the neck portion and the head portion 11 abuts the groove bottom of the groove 21 for limiting. In other words, the top of the valve 1 is provided with a clamping groove, the valve spring seat 2 is provided with a through hole 22, and the through hole 22 is clamped with the clamping groove of the valve 1, so that the head 11 is limited in the groove 21 of the valve spring seat 2.

The spring 5 is specifically a compression spring 5, which provides an acting force to the valve spring seat 2 to pull the valve spring seat 2 and the valve 1 tightly, so that the valve spring seat 2 abuts against the head 11 of the valve 1. The specific spring 5 can be a spiral spring 5, and the valve 1 is sleeved with the spring 5 for installation, so that the installation is convenient, and the deformation of the spring 5 is more stable.

At least a part of the contact surface 10 of the head 11 with the groove bottom of the groove 21 is a transition surface having a height difference in the axial direction of the valve 1. Here, the contact surface 10 between the head 11 and the groove bottom of the groove 21 includes both the surface of the head 11 that contacts the groove bottom of the groove 21 and the surface of the groove bottom of the groove 21 that contacts the head 11. At least a part of the surface of the head portion 11 contacting the groove bottom of the groove 21 is a transition surface having a height difference in the axial direction of the valve 1, and at least a part of the surface of the groove bottom of the groove 21 contacting the head portion 11 is also a transition surface having a height difference in the axial direction of the valve 1 to be in contact with the head portion 11. The size of the specific height difference can be set according to needs, and is not particularly limited herein. The contact surface 10 between the head 11 and the groove bottom of the groove 21 is no longer a plane perpendicular to the axial direction of the valve 1 due to the arrangement of the transition surface, so that the existence of the height difference necessarily increases the area size of the contact surface 10.

Other parts of the valve gear, such as the valve rocker arm assembly 3, the tappet 8, the tappet 9 and the like which are matched with the valve 1, and the connection relation can be referred to the prior art, and the details are not repeated. For example, the opening and closing of the valve 1 is performed by the action of a tappet 8 and a rocker arm mounted on a rocker arm holder by means of a rocker shaft, one end of which is driven from the camshaft via the tappet 8 and the other end of which bears against the valve 1 and acts in conjunction with a spring 5 to control the opening and closing of the valve 1.

By applying the valve device of the engine, when the engine works, the valve 1 moves up and down, and because at least part of the contact surface 10 between the head 11 of the valve 1 and the groove bottom of the groove 21 is a transition surface with a height difference in the axial direction of the valve 1, the contact surface 10 between the valve 1 and the valve spring seat 2 is enlarged under the condition that the valve 1 and the valve spring seat 2 have the same size as the conventional structure, so that the surface pressure on the valve spring seat 2 is reduced, the abrasion of the valve spring seat 2 is reduced, the sizes of the head 11 of the valve 1 and the valve spring seat 2 are not required to be increased, and the cost of the valve spring seat 2 is not additionally increased. In conclusion, the valve device of the engine provided by the invention has the advantages of more reasonable structure, more reliable work, no change in assembly mode and no increase in assembly difficulty.

Specifically, the transition surface includes an inclined surface inclined from the bottom to the top from the inside to the outside. That is, the contact surface 10 of the valve 1 and the valve spring seat 2 includes an inclined surface inclined from the bottom to the top from the inside to the outside, where the up-down direction corresponds to the head 11 and the bottom of the valve 1, i.e., the head 11 direction corresponds to the upper side and the opposite direction is the lower side. The inner and outer directions are perpendicular to the up and down directions. The whole transition surface can be an inclined surface inclined from bottom to top from inside to outside. As shown in fig. 2, the contact surface 10 between the valve 1 and the valve spring seat 2 is an inclined surface inclined from the bottom to the top and from the inside to the outside, and the contact and the position limitation are achieved by the inclined surface, and as for the contact surface 10, the area of the inclined surface is obviously increased relative to the horizontal contact surface perpendicular to the axial direction, thereby reducing the surface pressure received by the valve spring seat 2.

The inclination angle of the inclined surface may be specifically set as required, for example, the inclination angle is set in a range of 30 ° to 60 °. The inclination angle specifically refers to an included angle between the inclined surface and the axial direction of the valve 1, and the specific size of the inclination angle can be set according to the size of the contact surface 10, for example, the inclination angle of the inclined surface is set to be 45 °, 50 °, 55 °, and the like. The larger the inclination angle, the larger the area of the corresponding inclined surface, and of course, the inclination angle should be larger than 0 ° and smaller than 90 °, and the inclination angle is 0 ° and the corresponding contact surface 10 is perpendicular to the axis.

Further, the inclined surface is a conical surface. Because the valve 1 is generally rod-shaped with a circular cross section, the inclined surface is correspondingly set to be a conical surface so as to better adapt to the appearance of the valve 1 and facilitate processing. Meanwhile, the inclined surface is set to be a conical surface, and the limiting and restricting effects can be achieved on the swinging of the valve 1 relative to the valve spring seat 2. Of course, the case where the inclined surface is a conical surface here includes the case where the inclined surface is a partial conical surface. The inclined surface may be other inclined arc surfaces or inclined planes, etc., as required.

Specifically, the axis of the conical surface is collinear with the axis of the valve 1. That is, the axes of the conical surface on the valve 1 and the conical surface on the valve spring seat 2 are collinear with the axis of the valve 1, and the contact surface 10 can play a limiting role in centering the valve 1 and the valve spring seat 2, so that the valve 1 is centered better, axial swing between the valve spring seat 2 and the valve 1 is restrained, and abrasion caused by collision of the valve 1 and the valve spring seat 2 is further reduced. Therefore, through the arrangement of the conical surface, on one hand, the area of the contact surface 10 between the valve 1 and the valve spring seat 2 is increased, and the surface pressure applied to the valve spring seat 2 is reduced; on the other hand, the contact surface 10 can well restrain the axial swing between the valve spring seat 2 and the valve 1, and the durability and reliability of the valve spring seat 2 are improved from two aspects.

In the embodiments described above, the neck portion is a clearance fit with the through hole 22. Through clearance fit arrangement, the installation and the up-and-down movement of the valve 1 in the working process of the engine are facilitated. In the neck, specifically, as shown in fig. 2, the upper end and the lower end of the neck may be symmetrically arranged, that is, the size of the neck is smaller than that of the main body of the lower portion of the air bar.

On the basis of the above embodiments, the valve adjusting device further comprises a valve adjusting cap 4, wherein the valve adjusting cap 4 is installed outside the head 11 of the valve 1 and forms a close fit with the valve spring seat 2. The valve adjusting cap 4 is arranged at the top end of the valve 1 and is tightly matched with the valve 1 and the valve 1 spring 5, so that a valve mounting hole in the valve spring seat 2 is blocked, the displacement trend of the valve 1 towards the mounting hole direction is limited, the valve 1 cannot be separated in the operation process, and the durability and the working stability of the engine are ensured. Specifically, valve adjustment cap 4 includes inner chamber and outer wall, and recess 21 lateral wall shape of valve spring seat 2 cooperatees with the outer wall shape of valve adjustment cap 4, and the head 11 of valve 1 cooperatees with the inner chamber to make valve adjustment cap 4 receive the limiting displacement of valve spring seat 2, reliably install in valve spring seat 2, and play limiting displacement to valve 1.

Based on the valve device provided in the above embodiment, the invention also provides an engine including any one of the valve devices in the above embodiments. The valve device is arranged on a cylinder head 7 of an engine, and an oil baffle cover 6 is arranged in a matching way with the valve 1 to prevent oil from leaking through the valve 1. For other specific structures of the engine, please refer to the prior art, and the detailed description is omitted here. Since the engine employs the valve device in the above embodiment, please refer to the above embodiment for the beneficial effect of the engine.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. The utility model provides a valve gear of engine, includes valve (1), valve spring seat (2) and spring (5), recess (21) have on valve spring seat (2), the tank bottom of recess (21) has through-hole (22), valve (1) has the neck that the size is less than head (11) size, the neck is worn to locate in through-hole (22), spring (5) act on valve spring seat (2) so that head (11) card is located in recess (21), its characterized in that, head (11) with contact surface (10) of recess (21) tank bottom are from supreme inclined plane from inside to outside down.

2. The engine valve gear according to claim 1, characterized in that the inclination angle of the inclined surface ranges from 30 ° to 60 °.

3. The engine valve device according to claim 1, wherein the inclined surface is a conical surface.

4. A valve gear of an engine according to claim 3, characterized in that the axis of the conical surface is collinear with the axis of the valve (1).

5. A valve gear of an engine according to any one of claims 1-3, characterized in that the neck portion is clearance fitted with the through hole (22).

6. A valve gear according to any one of claims 1-3, characterized by further comprising a valve trim cap (4), said valve trim cap (4) being mounted outside the head (11) of said valve (1) and forming a close fit with said valve spring seat (2).

7. An engine characterized by comprising a valve device according to any one of claims 1 to 6.