阅读说明：本技术 一种汽车发动机的皮带张紧轮机构 (Belt tensioning wheel mechanism of automobile engine ) 是由 钱献荪 潘斌 安琦 于 2018-06-22 设计创作，主要内容包括：本发明涉及汽车技术领域,特别是涉及一种汽车发动机的皮带张紧轮机构；为了解决现有技术中非对称摩擦阻尼张紧轮结构复杂等问题,提出了发明技术方案。一种汽车发动机的皮带张紧轮机构,其特征是：所述的摩擦片(10)和阻尼片(11),该两者的相抵接触面为斜坡形面；换言之,所述摩擦片(10)的相抵接触面为摩擦斜坡形面,所述阻尼片(11)的相抵接触面为阻尼斜坡形面,并且摩擦斜坡形面和阻尼斜坡形面形状吻合。有益效果：利用楔形面之间的摩擦产生非对称阻尼,其结构简单,制造方便,成本低廉；等等。(The invention relates to the technical field of automobiles, in particular to a belt tensioning wheel mechanism of an automobile engine; the technical scheme is provided for solving the problems that the asymmetric friction damping tension pulley in the prior art is complex in structure and the like. The utility model provides a belt tightener mechanism of automobile engine which characterized by: the friction plate (10) and the damping plate (11) have a slope surface at the contact surface; in other words, the contact surface of the friction plate (10) is a friction slope surface, the contact surface of the damping plate (11) is a damping slope surface, and the shapes of the friction slope surface and the damping slope surface are matched. Has the advantages that: the friction between the wedge surfaces is utilized to generate asymmetric damping, and the asymmetric damping device is simple in structure, convenient to manufacture and low in cost; and so on.)

1. A belt tensioner mechanism for an automotive engine, comprising: the friction component is arranged in the cavity of the rocker arm (3);

the method is characterized in that:

the friction assembly comprises a friction plate (10) and a damping plate (11);

the mandrel (9), the friction plate (10), the damping plate (11) and the disc spring (12) are in a coaxial relationship; the bottom of the cavity of the rocker arm (3), a disc spring (12), a damping sheet (11) and a friction sheet (10) are sequentially abutted;

the damping fin (11) and the cavity of the rocker arm (3) are synchronous in the circumferential direction and move relatively in the axial direction;

the upper end of the mandrel (9) is fixedly connected with the base (5), and the lower end of the mandrel is fixedly connected with the friction plate (10);

the friction plate (10) and the damping plate (11) have a slope surface at the contact surface; in other words, the contact surface of the friction plate (10) is a friction slope surface, the contact surface of the damping plate (11) is a damping slope surface, and the shapes of the friction slope surface and the damping slope surface are matched.

2. The belt tensioner mechanism of an automotive engine as claimed in claim 1, characterized in that:

the friction plate (10) is characterized in that the friction slope surface of the friction plate is a friction spiral curved surface, the friction spiral curved surface is circumferentially arranged in a surrounding manner, and the head and the tail of the friction spiral curved surface are of a step-shaped structure;

correspondingly, the damping slope surface of the damping sheet (11) is a damping spiral curved surface, the damping spiral curved surface is circumferentially arranged in a surrounding manner, and the head and the tail of the damping spiral curved surface are of a step-shaped structure;

the friction spiral curved surface is matched with the damping spiral curved surface in shape.

3. The belt tensioner mechanism of an automotive engine as claimed in claim 1, characterized in that:

the friction plate (10) is characterized in that the friction slope surface of the friction plate is a friction spiral curved surface, the friction spiral curved surface comprises more than two friction spiral sub-curved surfaces, each friction spiral sub-curved surface is rotationally symmetrical, and the head and the tail of each friction spiral sub-curved surface are of a step structure;

the damping sheet (11) is characterized in that the damping slope surface of the damping sheet is a damping spiral curved surface, the damping spiral curved surface comprises damping spiral sub-curved surfaces, the number of the damping spiral sub-curved surfaces is consistent with that of the friction spiral sub-curved surfaces, each damping spiral sub-curved surface is rotationally symmetrical, and the head and the tail of each damping spiral sub-curved surface are of a step structure;

the friction spiral partial curved surface is matched with the damping spiral partial curved surface in shape.

4. The belt tensioner mechanism of an automotive engine as claimed in claim 1, characterized in that:

the friction plate (10) is characterized in that the friction slope-shaped surface comprises four friction slope-shaped sub-planes, each friction slope-shaped sub-plane is rotationally symmetrical, and the head and the tail of each friction slope-shaped sub-plane are of a step structure;

the damping sheet (11) is characterized in that the damping slope surface of the damping sheet comprises four damping slope-shaped sub-planes, each damping slope-shaped sub-plane has a rotational symmetry property, and the head and the tail of each damping slope-shaped sub-plane are of a step structure;

the friction slope-shaped plane-splitting surface is matched with the damping slope-shaped plane-splitting surface.

5. The belt tensioner mechanism of an automotive engine as claimed in claim 1, characterized in that:

the friction plate (10) is characterized in that the friction slope-shaped surface comprises five friction slope-shaped sub-planes, each friction slope-shaped sub-plane is rotationally symmetrical, and the head and the tail of each friction slope-shaped sub-plane are of a step structure;

the damping sheet (11) is characterized in that the damping slope surface of the damping sheet comprises five damping slope-shaped sub-planes, each damping slope-shaped sub-plane has a rotational symmetry property, and the head and the tail of each damping slope-shaped sub-plane are of a step structure;

the friction slope-shaped plane-splitting surface is matched with the damping slope-shaped plane-splitting surface.

6. The belt tensioner mechanism of an automotive engine as claimed in claim 1, characterized in that:

the friction plate (10) is characterized in that the friction slope-shaped surface comprises six friction slope-shaped sub-planes, each friction slope-shaped sub-plane is rotationally symmetrical, and the head and the tail of each friction slope-shaped sub-plane are of a step structure;

the damping sheet (11) is characterized in that the damping slope surface of the damping sheet comprises six damping slope-shaped sub-planes, each damping slope-shaped sub-plane has a rotational symmetry property, and the head and the tail of each damping slope-shaped sub-plane are of a step structure;

the friction slope-shaped plane-splitting surface is matched with the damping slope-shaped plane-splitting surface.

7. The belt tensioner mechanism of an automotive engine as claimed in claim 1, characterized in that:

the edge of the damping sheet (11) is provided with a convex structure; the cavity of the rocker arm (3) is provided with a concave structure; the convex structure of the damping fin (11) is positioned in the concave structure of the cavity of the rocker arm (3).

Technical Field

The invention relates to the technical field of automobiles, in particular to a belt tensioning wheel mechanism of an automobile engine; the tensioning wheel mechanism provided by the invention is provided with the wedge-shaped friction disc and can provide asymmetric friction damping.

Background

Disclosure of Invention

Drawings

FIG. 1 is a perspective view of the inventive belt tensioner mechanism;

FIG. 2 is a front view of the inventive belt-tensioner mechanism;

FIG. 3 is a top view of FIG. 2;

FIG. 4 is a bottom view of FIG. 2;

FIG. 5 is a cross-sectional view of the inventive belt-tensioner mechanism;

FIG. 6 is one of the perspective views of the friction plate 10 and the damping plate 11 of the present invention;

FIG. 7 is a second perspective view of the friction plate 10 and the damping plate 11 of the present invention; fig. 6 and 7 are schematic perspective views from different viewing angles, and the viewing objects are the same friction plate 10 and damping plate 11;

FIG. 8 is a sectional view of the disc spring 12, the damping plate 11 and the friction plate 10 of the invention; the damping plate 11 and the friction plate 10 in fig. 8 have rotated relatively by a plurality of angles;

FIG. 9 is a force analysis diagram of the friction plate 10 and the damping plate 11 in the loading direction during the rotational friction;

FIG. 10 is a force analysis diagram of the friction plate 10 and the damping plate 11 in the unloading direction of the present invention during rotational friction;

FIG. 11 is an exploded view of a prior art belt tensioner mechanism;

FIG. 12 is an exploded view of the inventive belt tensioner mechanism;

fig. 13 is a schematic illustration of a simulation of a prior art tensioner, fig. 13 relating to friction plate 10, damping plate 11 and disc spring 12;

FIG. 14 is a schematic perspective view of FIG. 13 with parts separated;

fig. 15 is a perspective view of the contact surface between the friction plate 10 and the damping plate 11 in the prior art, in which the oblique line part is the contact surface (also called friction contact surface);

fig. 16 is a schematic diagram of a simulation demonstration of the inventive technique, fig. 13 relating to the friction plate 10, the damping plate 11 and the disc spring 12;

FIG. 17 is a schematic perspective view of FIG. 16 with parts separated;

fig. 18 is a perspective view of the contact surface between the friction plate 10 and the damping plate 11 according to the present invention, and the hatched portion in the drawing is the contact surface (also called a friction contact surface).

The reference numerals in the figures illustrate:

a belt pulley 1; a bolt 2; a rocker arm 3; a flat spiral spring 4; a base 5; a dust cover 6; a base stopper 7; a rocker arm stopper 8; a mandrel 9; a friction plate 10; a damper plate 11; a disc spring 12; a wear reducing plate 13; a bushing 14; a bearing 15;

A. the schematic points in FIG. 6; B. phantom points in FIG. 15; C. phantom points in FIG. 18; D. the position to which the imaginary point C is rotated in fig. 18; E. the position to which the imaginary point C is rotated in fig. 18.

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

Detailed Description

The general technical scheme of the invention is described first, and then the general technical scheme is illustrated and explained.

The general technical solution of the present invention is described as follows.

The invention relates to a belt tensioning wheel mechanism of an automobile engine, which comprises: the rocker arm is provided with a cavity 3, a plane volute spring 4, a base 5, a mandrel 9, a disc spring 12 and a friction component arranged in the cavity of the rocker arm 3.

The present invention is characterized as follows.

The friction assembly comprises a friction plate 10 and a damping plate 11;

the mandrel 9, the friction plate 10, the damping plate 11 and the disc spring 12 are in a coaxial relationship; the bottom of the cavity of the rocker arm 3, a disc spring 12, a damping sheet 11 and a friction sheet 10 are sequentially abutted;

the damping fin 11 and the cavity of the rocker arm 3 are synchronous in the circumferential direction and move relatively in the axial direction;

the upper end of the mandrel 9 is fixedly connected with the base 5, and the lower end of the mandrel is fixedly connected with the friction plate 10;

the friction plate 10 and the damping plate 11 have a slope surface as the contact surface against the friction plate and the damping plate; in other words, the contact surface of the friction plate 10 is a friction slope surface, the contact surface of the damping plate 11 is a damping slope surface, and the shape of the friction slope surface is matched with that of the damping slope surface.

The general technical solution of the present invention is described above; the overall solution is explained and explained below.

1. The friction plate 10 and the damping plate 11 of the prior art have the abutting contact surfaces which are not inclined slopes but are horizontal (vertical if viewed by rotating 90 degrees).

In the prior art, the central axes of the mandrel 9, the friction plate 10 and the damping plate 11 are superposed; in the invention technology, the central axes of the mandrel 9, the friction plate 10 and the damping plate 11 are also overlapped.

Imagine the existence of an imaginary plane that is perpendicular to the axis of the mandrel 9; the contact surface between the friction plate 10 and the damping plate 11 in the prior art is coincident with or parallel to the assumed plane; the abutting contact surfaces of the friction plate 10 and the damping plate 11 are not overlapped with an assumed plane or parallel to the assumed plane.

In the friction process (i.e. when the friction plate 10 and the damping plate 11 are in relative friction rotation) in the prior art, the friction pressure is not changed, namely the friction damping is not changed, no matter in the loading direction or the unloading direction.

b. The friction damping is different between the loading direction and the unloading direction when the technology of the invention is used for friction. The frictional damping becomes large when rotating in the loading direction; the frictional damping becomes smaller when turning in the unloading direction.

In the invention technology, the above-mentioned rotation directions are different, and the friction damping is different, and the fundamental reason is that: when the friction plate 10 and the damping plate 11 move in the loading direction, the friction plate and the damping plate move relatively uphill; when the unloading direction moves, the friction plate 10 and the damping plate 11 move relatively downhill. In the following examples, further details are provided.