CN212250926U

CN212250926U - Unilateral variable-pitch valve spring and winding tool thereof

Info

Publication number: CN212250926U
Application number: CN202020897184.7U
Authority: CN
Inventors: 陈华健; 朱文奇; 郝国华; 蔡栋; 李斌; 侯世玉; 胡健
Original assignee: Anqing Scherdel Automotive Parts Co ltd
Current assignee: Anqing Scherdel Automotive Parts Co ltd
Priority date: 2020-05-22
Filing date: 2020-05-22
Publication date: 2020-12-29
Anticipated expiration: 2030-05-22

Abstract

The utility model provides a unilateral variable pitch valve spring and a winding tool thereof, wherein a spring body comprises a top end doubling ring, an equal pitch ring, a transition ring, a variable pitch ring and a bottom end doubling ring from top to bottom along the axial direction; the pitch of the variable-pitch ring is smaller than that of the equal-pitch ring, and the variable-pitch ring is uniformly transited through the transition ring; from the top end doubling up to the quarter of the equal pitch circle, the outer diameter of the spring is gradually increased, and the maximum value is smaller than the inner diameter of the spring which is doubled up at the bottom end. The utility model discloses a design of unilateral variable pitch reduces the external diameter of spring upper end, increases the natural frequency of shaking of spring body, has avoided taking place to shake under the high speed of transporting when realizing the lightweight, easily distinguishes during the assembly, reduces the assembly mistake.

Description

Unilateral variable-pitch valve spring and winding tool thereof

Technical Field

The utility model relates to a technical field is made to the spring, concretely relates to unilateral variable pitch valve spring and coiling frock thereof.

Background

In the prior art, along with the implementation of the national emission standard, the energy conservation, emission reduction and lightweight performance of an engine and accessories of an automobile are more and more emphasized, and a cylindrical valve spring is always favored due to the advantages of low production difficulty and low price, but has no advantage in lightweight. Meanwhile, the maximum rotating speed of the current engine can reach 7100 rpm or even higher, the common equal-pitch valve spring is easy to vibrate under the condition of high rotating speed, particularly when the rotating speed is greater than 5500 rpm, the spring can be subjected to ring combination, the spring is broken and fails due to the sharp increase of elasticity and stress, and further irreparable damage is caused to the engine.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem that the common cylindrical equal-pitch valve spring is easy to vibrate under the condition of high rotating speed so as to cause the phenomenon of spring fracture failure in the prior art, the structure and the process of the spring need to be improved, and the valve spring with good damping effect is provided.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a single-side variable-pitch valve spring comprises a spring body, wherein the spring body comprises a top end parallel ring, an equal pitch ring, a transition ring, a variable pitch ring and a bottom end parallel ring from top to bottom along the axial direction; the pitch of the variable-pitch ring is smaller than that of the equal-pitch ring, and the variable-pitch ring is uniformly transited through the transition ring; from the top end doubling up to the quarter of the equal pitch circle, the outer diameter of the spring is gradually increased, and the maximum value is smaller than the inner diameter of the spring which is doubled up at the bottom end.

Further, the spring body satisfies the following relation:

De1-Di2<1.5d；De1-Di2>0

where De1 is the spring top outer diameter, Di2 is the spring bottom inner diameter, and d is the spring wire diameter.

Preferably, the pitch of the equal-pitch ring is 7.5-8.0mm, the pitch of the transition ring is 4.5-7.5mm, and the pitch of the variable-pitch ring is 4.0-4.5 mm.

Preferably, the top end parallel winding and the bottom end parallel winding are respectively set to be one winding, the equal pitch winding accounts for 30% of the total number of turns of the spring, the transition winding accounts for 10% of the total number of turns of the spring, and the variable pitch winding accounts for about 40% of the total number of turns of the spring.

A winding tool for a single-side variable-pitch valve spring comprises a feeding mechanism and a winding mechanism, wherein the feeding mechanism comprises a guide plate for straightening and limiting and at least one group of feeding rollers arranged on two sides of the guide plate, and the feeding rollers are used for feeding wire raw materials into the winding mechanism; the winding mechanism comprises a cutter holder, a pitch pin and at least two winding pins, and the pitch pin and the winding pins can move under the action of a driving device.

The utility model discloses a design of unilateral variable pitch reduces the external diameter of spring upper end, increases the natural frequency of shaking of spring body, has avoided taking place to shake under the high speed of transporting when realizing the lightweight, easily distinguishes during the assembly, reduces the assembly mistake.

Drawings

FIG. 1 is a schematic flow chart of the steps of the present invention;

FIG. 2 is a diagram showing the relationship between the number of turns and the pitch of the spring according to the present invention;

fig. 3 is a schematic structural view of the spring winding tool of the present invention;

in the figure: 1. top end doubling; 2. a circle with equal pitch; 3. a transition ring; 4. a variable pitch ring; 5. bottom end doubling; 6. a guide plate; 7. a feeding roller; 8. a base; 9. a pitch pin; 10. and winding the pin.

Detailed Description

A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

The unilateral variable-pitch valve spring shown in fig. 1 comprises a spring body, wherein the spring body comprises a top end parallel ring, an equal-pitch ring, a transition ring, a variable-pitch ring and a bottom end parallel ring from top to bottom along the axial direction; the pitch of the variable-pitch ring is smaller than that of the equal-pitch ring, and the variable-pitch ring is uniformly transited through the transition ring; from the top end doubling up to the quarter of the equal pitch circle, the outer diameter of the spring is gradually increased, and the maximum value is smaller than the inner diameter of the spring which is doubled up at the bottom end.

In order to avoid winding and safety of design, the spring body according to the preferred embodiment satisfies the following relation:

De1-Di2<1.5d；De1-Di2>0

As shown in FIG. 2, the pitch of the equal pitch circle of the preferred embodiment is 7.5-8.0mm, the pitch of the transition circle is 4.5-7.5mm, and the pitch of the variable pitch circle is 4.0-4.5 mm. The top end doubling-up and the bottom end doubling-up are respectively set to be a circle, the equal pitch circle accounts for 30% of the total number of turns of the spring, the transition circle accounts for 10% of the total number of turns of the spring, and the variable pitch circle accounts for about 40% of the total number of turns of the spring. When the spring is compressed under stress, the variable pitch part is firstly compressed, the rigidity of the spring is not constant any more in a certain range but is obviously improved, and the natural vibration frequency of the spring is also obviously improved, so that the single-side variable pitch spring has a good damping effect.

The specific calculation formula of the natural vibration frequency of the spring is as follows:

wherein f is_eIs the natural vibration frequency of the spring, d is the wire diameter of the spring, and n is the effective number of turnsD is the spring pitch diameter, G is the shear modulus, and ρ is the density.

When the spring is stressed and compressed, the variable-pitch part is firstly compressed, the effective number of turns is reduced, and other parameters are unchanged, so that the natural vibration frequency of the spring is obviously improved, a good damping effect is achieved in the high-rotation-speed motion process of an engine, and the condition that the service life of the valve spring is reduced due to flutter is improved.

The winding tool for the unilateral variable-pitch valve spring shown in fig. 3 comprises a feeding mechanism and a winding mechanism, wherein the feeding mechanism comprises a guide plate for straightening and limiting and at least one group of feeding rollers arranged on two sides of the guide plate, and the feeding rollers are used for feeding wire raw materials into the winding mechanism; the winding mechanism comprises a cutter holder, a pitch pin and at least two winding pins, and the pitch pin and the winding pins can move under the action of a driving device.

In the winding process, two winding pins are generally adopted, after wire raw materials enter a winding mechanism through a feeding mechanism, the wire raw materials are wound into a circle through a cutter holder and the two winding pins according to a three-point rounding theorem, the outer diameter of the circle is controlled by changing the positions of the two winding pins, a circle of continuous circle can be formed along with continuous feeding, and meanwhile, the pitch is controlled through the movement of the pitch pin.

In the specific operation, the target values of the pitch and the outer diameter winding of the spring are required to be set; then, feeding the wire raw material into a winding mechanism through a feeding roller and a guide plate; and the winding mechanism regulates the movement of the pitch pin and the winding pin according to the target value, and controls the pitch and the outer diameter of the spring to be wound so as to wind and form the spring.

The above-mentioned embodiments are only to describe the preferred embodiments of the present invention, but not to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art without departing from the design spirit of the present invention should fall into the protection scope defined by the claims of the present invention.

Claims

1. The utility model provides a unilateral variable pitch valve spring, includes the spring body, its characterized in that:

the spring body comprises a top end parallel ring (1), an equal pitch ring (2), a transition ring (3), a variable pitch ring (4) and a bottom end parallel ring (5) from top to bottom along the axial direction;

the pitch of the variable-pitch ring is smaller than that of the equal-pitch ring, and the variable-pitch ring is uniformly transited through the transition ring;

from the top end doubling up to the quarter of the equal pitch circle, the outer diameter of the spring is gradually increased, and the maximum value is smaller than the inner diameter of the spring which is doubled up at the bottom end.

2. A single-sided variable pitch valve spring according to claim 1, wherein said spring body satisfies the following relationship:

De1-Di2<1.5d；De1-Di2>0

3. A single-sided variable pitch valve spring according to claim 1, wherein the pitch of the equal pitch ring (2) is 7.5-8.0mm, the pitch of the transition ring (3) is 4.5-7.5mm, and the pitch of the variable pitch ring (4) is 4.0-4.5 mm.

4. A single-sided variable-pitch valve spring according to claim 1, wherein the top-end parallel winding and the bottom-end parallel winding are respectively set to be one winding, the equal-pitch winding (2) accounts for 30% of the total number of turns of the spring, the transition winding (3) accounts for 10% of the total number of turns of the spring, and the variable-pitch winding (4) accounts for about 40% of the total number of turns of the spring.

5. A winding tool based on the unilateral variable-pitch valve spring according to any one of claims 1-4, and is characterized by comprising a feeding mechanism and a winding mechanism, wherein the feeding mechanism comprises a guide plate (6) for straightening and limiting and at least one group of feeding rollers (7) arranged on two sides of the guide plate, and the feeding rollers are used for feeding wire raw materials into the winding mechanism; the winding mechanism comprises a tool apron (8), a pitch pin (9) and at least two winding pins (10), wherein the pitch pin and the winding pins can move under the action of a driving device.