CN110121609B

CN110121609B - Mounting structure of reversible torsion spring and rotary gear

Info

Publication number: CN110121609B
Application number: CN201780081574.8A
Authority: CN
Inventors: 金昌洲; 郭大荣; 金奎都
Original assignee: Yilai Automotive Electronic Chassis System Co ltd
Current assignee: Yilai Automotive Electronic Chassis System Co ltd
Priority date: 2016-12-29
Filing date: 2017-12-20
Publication date: 2021-04-06
Anticipated expiration: 2037-12-20
Also published as: KR101973480B1; CN110121609A; WO2018124603A2; KR20180077446A; WO2018124603A3

Abstract

The present invention relates to a torsion spring and a rotary gear, and more particularly, to a torsion spring and a rotary gear mounting structure, in which a torsion spring applicable to an EGR valve is configured to be capable of rotating in both forward and reverse directions. According to the first embodiment of the present invention, there may be provided a mounting structure of a reversible torsion spring and a rotary gear, including: a torsion spring; a rotary gear including a rotary shaft having gear teeth formed on an outer circumferential surface thereof and extending downward from a center thereof, the torsion spring being attached to the outer circumferential surface of the rotary shaft; at least two guide rods formed to protrude downward from an upper surface of an outer side of the rotary gear, and restricting movement of one end and the other end of the torsion spring; and a fixing portion formed on an inner side surface of the housing, the housing covering the rotary gear to form an appearance of the EGR valve, the torsion spring including a body fixing ring, the fixing portion covering the body fixing ring to prevent the body fixing ring from rotating.

Description

Mounting structure of reversible torsion spring and rotary gear

Technical Field

The present invention relates to a torsion spring and a rotary gear, and more particularly, to a torsion spring and a rotary gear mounting structure that is capable of rotating in both forward and reverse directions.

Background

Generally, EXHAUST GAS RECIRCULATION (EGR) refers to a technique of recirculating a part of EXHAUST GAS of an engine to an intake system of the engine, thereby using the EXHAUST GAS together with external air for combustion. Since the exhaust gas is recirculated, there is an advantage in that NOx discharged from the vehicle into the atmosphere can be reduced.

An important technique for the EGR technique is an EGR valve.

The EGR valve is used to adjust the recirculation amount of exhaust gas flowing from the exhaust pipe to the intake branch pipe side or mixed with outside air to the compressor tip side.

As the EGR valve, a butterfly valve, that is, a valve for adjusting the flow rate of a pipe by rotating a valve body having a disk shape in a valve pipe is mainly used, and here, a rotary gear to which a torsion spring is attached is included to adjust the operation of the valve.

In the case where the impurities are stacked on the EGR valve according to the use environment of the EGR valve, the impurities should be appropriately removed so that the correct performance of the EGR valve can be maintained. As a method for removing impurities in the EGR valve, the following method is mainly used: a method of directly removing impurities by decomposing the EGR valve and a method of removing impurities by reversing the disc-shaped EGR valve in a direction opposite to a general opening direction.

However, the method of directly removing impurities by decomposing the EGR valve has a problem in that maintenance efficiency is not good because of a large loss of time and personnel, and thus a method of removing impurities by reversing the EGR valve has been attracting attention.

As a way of reversing the EGR valve, a way designed in the following form is studied in the related art: one torsion spring is made as a two-stage spring in the rotary gear, or two torsion springs are connected to each other so as to be capable of being reversed. However, in the case of the above-described aspect, a process of connecting the two springs is added, and thus there is not only a difficulty in manufacturing but also a difficulty in manufacturing due to a complicated structure, and there is no significant contribution to cost reduction.

Fig. 1 is a perspective view showing a state of coupling between a rotary gear and a torsion spring according to a conventional technique. Fig. 2 is a view showing a state in which a rotary gear and a torsion spring are coupled to each other as seen from below.

Referring to fig. 1 and 2 together, an inner guide 11 and an outer guide 12 having a cylindrical shape are provided on one surface of a rotary gear 10, and the inner guide 11 and the outer guide 12 are formed in concentric circles and are protruded to be spaced apart from each other. The torsion spring 20 is disposed between the inner guide 11 and the outer guide 12 so as to surround the inner guide 11. Here, the outer guide 12 is formed with a fixed portion 13 and a movable portion 14, one end of the torsion spring is fixed to the fixed portion 13, the other end 22 of the torsion spring is movably disposed in the movable portion 14, and the torsion spring 20 is compressed or relaxed by the movement of the other end 22 disposed in the movable portion 14.

In the case of the prior art shown in fig. 1 and 2, the frictional force between the housing and the torsion spring is reduced so that a plurality of ribs protruding from the outer guide surface are formed in such a manner that the center axes coincide, thereby contacting the outer peripheral surface of the torsion spring.

Disclosure of Invention

The present invention has been made in an effort to develop a structure capable of performing normal rotation and reverse rotation while having one spring structure, to finally perform the normal rotation and reverse rotation, and to improve durability of an EGR valve.

According to a first embodiment of the present invention, there may be provided a mounting structure of a reversible torsion spring and a rotary gear, characterized by comprising: a torsion spring; a rotary gear including a rotary shaft having gear teeth formed on an outer circumferential surface thereof and extending downward from a center thereof, the torsion spring being attached to the outer circumferential surface of the rotary shaft; at least two guide rods formed to protrude downward from an upper surface of an outer side of the rotary gear, and restricting movement of one end and the other end of the torsion spring; the fixing part is processed on the inner side surface of the shell, and the shell covers the rotating gear to form the appearance of the EGR valve; the torsion spring includes a body fixing ring, and the fixing portion covers the body fixing ring and prevents the body fixing ring from rotating.

Here, the fixing portion may be formed at a height corresponding to a half of the overall height of the torsion spring, and the torsion spring may be provided such that the rotation directions of the fixing portion upper torsion spring and the fixing portion lower torsion spring are opposite directions with respect to the fixing portion.

The body fixing ring may be extended by a predetermined length in the centrifugal direction from a portion excluding both end portions of the torsion spring.

Here, in order to control the opening angle of each of the normal rotation and the reverse rotation of the EGR valve for performing the normal rotation or the reverse rotation, the body fixing ring may be provided to be spaced apart from the height corresponding to a half of the entire height of the torsion spring by a predetermined distance in the vertical direction.

According to one embodiment of the present invention, a mounting structure of a torsion spring capable of forward and reverse rotation is disclosed.

The torsion spring of the present invention, which is a one-stage torsion spring of a structure formed of a single spring wire, has an advantage in that it is easy to manufacture, compared to a torsion spring of a two-stage structure.

The rotation center of the torsion spring is made to coincide with the rotation axis of the rotary gear, and the body fixing ring formed on the torsion spring is attached to the fixing portion of the rotary gear to be easily fixed, thereby being capable of rotating in both directions, i.e., in forward or reverse directions.

Drawings

Fig. 1 is a perspective view showing a state of coupling between a rotary gear and a torsion spring according to a conventional technique.

Fig. 2 is a bottom view showing a state of coupling between a rotary gear and a torsion spring according to the prior art.

Fig. 3 is a perspective view illustrating a coupling state of a rotary gear and a torsion spring according to an embodiment of the present invention.

Fig. 4 is a perspective view illustrating the shape of a torsion spring according to an embodiment of the present invention.

Fig. 5 is a perspective view illustrating a torsion spring according to an embodiment of the present invention.

Fig. 6 is a bottom view illustrating a coupled state of a rotary gear, a housing, and a torsion spring according to an embodiment of the present invention.

Detailed Description

The embodiments described below are provided to enable a practitioner to easily understand the technical idea of the present invention, and the present invention is not limited thereto. Note that items shown in the drawings are diagrams for ease of explanation of the embodiments of the present invention, and may be different from actual embodiments.

When a certain component is referred to as being connected or joined to another component, it is to be understood that another component may be present therebetween, although it may be directly connected or joined to the other component.

Also, herein, "connected" is intended to include direct connection and indirect connection of one component to another component, and may mean all physical connections such as adhesion, attachment, fastening, joining, bonding, and the like.

Further, expressions like "first, second" and the like are expressions used only for the purpose of distinguishing a plurality of configurations, and the order or other features between the configurations are not limited.

The singular expressions include the plural expressions as long as they are not explicitly expressed otherwise in context. The terms "comprises," "comprising," or "having" mean the presence of the stated features, integers, steps, operations, elements, components, or groups thereof, and are to be construed as indicating that one or more other features, integers, steps, operations, elements, components, or groups thereof may be added.

Hereinafter, the mounting structure of the rotary gear and the torsion spring according to the present invention will be described in detail with reference to the accompanying drawings.

Fig. 5 is a bottom view illustrating a coupled state of a rotary gear, a housing, and a torsion spring according to an embodiment of the present invention.

Fig. 6 is a perspective view illustrating a torsion spring according to an embodiment of the present invention.

A mounting structure of a rotary gear and a torsion spring according to an embodiment of the present invention includes: a torsion spring 200; a rotary gear 100 including a rotary shaft 110, the rotary shaft 110 having gear teeth formed on an outer circumferential surface thereof and extending downward from a center thereof, the torsion spring 200 being attached to the outer circumferential surface of the rotary shaft 110; at least two or more guide rods 120 formed to protrude downward from an outer upper surface of the rotary gear 100 to restrict movement of one end and the other end of the torsion spring; and a fixing part 130 formed on an inner surface of a housing covering the rotary gear 100 to form an external appearance of the EGR valve; the torsion spring 200 includes a body fixing ring 230, and the fixing portion 130 covers the body fixing ring 230 and prevents the body fixing ring 230 from rotating.

The axis of the rotation shaft 110 of the rotation gear and the driven shaft (or the rotation center) of the torsion spring 200 have the same axis.

The rotary shaft 110 transmits a rotational force of the rotary shaft, which is rotated by receiving a driving force transmission through a gear or the like formed on a motor extending to a lower side of the rotary gear 100, to an EGR valve (butterfly valve), and when the driving of the motor is completed (when the ECU lamp instructs to close the EGR valve), the rotary shaft rotates together with the rotary gear by an elastic force of a torsion spring 200 connected to the rotary gear 100 and is restored to an initial state.

The fixing structure of the torsion spring and the rotary gear may include a fixing portion 130, and the fixing portion 130 may be formed inside the rotary gear independently of the guide bar 120 and may be in contact with the outer circumference of the torsion spring 200 to fix the body fixing ring formed on the outer circumference.

At least two or more guide bars 120 are formed in the present invention so that the movement of one end 210 and the other end 220 of the torsion spring 200 can be restricted. One end 210 and the other end 220 of the torsion spring are caught to the guide bars 120, respectively, to be in a fixed state.

The torsion spring 200 of the present invention is formed of SUS material like a general torsion spring, and has a one-stage spring structure having more than two rotational directions by means of a single spring wire, instead of a two-stage spring structure, and thus may be designed to enable forward or reverse rotation according to the operator's request.

A general spring exerts a force for damping a vertical force by elasticity generated when the spring is compressed or extended, but a torsion spring exerts a force for damping a torsion by elasticity generated when the spring is twisted. In a general torsion spring, if torsional deformation occurs, the function of damping is performed for the torsional deformation in one direction, but the function of damping cannot be performed in the opposite direction.

However, the torsion spring 200 of the present invention has a structure having two or more rotational directions by a single spring wire, and therefore is designed to exhibit a damping action not only against torsional deformation in one direction (forward direction) but also against torsional deformation in the opposite direction (reverse direction).

Therefore, in the process of manufacturing the torsion spring 200 of the present invention, as shown in fig. 4, in the process of winding in the spiral direction, a portion except for both end portions of the torsion spring is protruded and extended in the outer direction of the rotation center of the torsion spring, so that a circular arc-shaped ring can be formed.

As shown in fig. 5, the ring is attached to the inside of the fixing portion 130, and may be named as a body fixing ring 230. In other words, a portion other than both end portions of the torsion spring according to an embodiment of the present invention may be protruded in the centrifugal direction by a predetermined length.

Accordingly, since the torsion deformation of the torsion spring 200 in one direction (forward direction) is interrupted by the body fixing ring 230 connected to and fixed to the housing and the torsion spring region wound in the opposite direction provided behind the body fixing ring 230 is not subjected to the torsion deformation, the torsion spring including two or more rotation regions divided around the body fixing ring can be provided, and the torsion spring can exert a cushioning effect against the torsion deformation in one direction (forward direction) and also against the torsion deformation in the opposite direction (reverse direction).

Unlike the prior art as viewed in fig. 1 and 2, the forward rotation and the reverse rotation are also possible in a state where one end 210 and the other end 220 of the torsion spring 200 are completely fixed to the guide bar 120 without providing an additional gap. This improves the durability of the valve to which the torsion spring 200 is attached.

Further, the torsion spring may perform the normal rotation or the reverse rotation by one spring formed in one direction, and the body fixing ring may have a structure in which it is protruded and extended in a shape that is horizontal or inclined with respect to the torsion spring, thereby being characterized in that the aforementioned operational effect of the normal rotation or the reverse rotation can be solved by a simple structural improvement.

Hereinafter, the structure of the fixing portion 130 will be described in more detail with reference to fig. 5.

The fixing portion 130 formed at the inner side of the housing separately having another constitution from the rotary gear 100 may be formed in a form of being in contact with the outer circumference of the torsion spring 200. The body fixing ring 230 of the torsion spring 200 formed at the rotary gear is attached to the fixing portion 130 and fixed, not to the guide bar 120 fixing one end 210 or the other end 220 of the torsion spring 200, so that the torsion spring 200 can be rotated in both directions with the body fixing ring as a reference due to the different winding directions.

In addition, according to circumstances, in order to control the opening angle of each of the normal rotation and the reverse rotation of the EGR valve that performs the normal rotation or the reverse rotation, the body fixing ring of the present invention may be provided to be spaced apart from the height corresponding to a half of the entire height of the torsion spring by a predetermined distance in the up-down direction. This means that the position of the torsion spring can be adjusted in the entire height thereof according to the opening angle of the forward or reverse valve, which is a target height at which the body fixing ring 230 is provided.

Referring to fig. 6, there is shown a pattern in which the body fixing ring 230 is position-adjusted in a lower direction in the height of the overall torsion spring as compared with fig. 4, and it can be freely adjusted according to a design pattern when adjusting the valve opening angles of the forward rotation and the reverse rotation of the desired object.

For example, if the normal rotation of the EGR valve is induced by the rotation direction of the rotary gear and the rotary shaft in the winding direction of the torsion spring formed on the upper side of the body fixing ring with the body fixing ring 230 as the center, the magnitude of torque per unit length compressed by the torsion spring formed on the upper side of the body fixing ring with the body fixing ring 230 as the center is smaller than the magnitude of torque per unit length compressed by the torsion spring formed on the lower side of the body fixing ring with the body fixing ring 230 as the center, and therefore the valve opening amount by the forward direction corresponding to the torque of the same magnitude generated from the motor is designed to be larger than the valve opening amount by the reverse direction.

In contrast, if the reverse rotation of the EGR valve is induced by the rotation direction of the rotary gear and the rotary shaft in the winding direction of the torsion spring formed on the upper side of the body fixing ring 230 centering on the body fixing ring, the valve opening amount due to the reverse rotation can be designed to be larger than the valve opening amount due to the forward rotation.

As described above, the control may be performed in accordance with a change in the design height of the body fixing ring 130.

It is not intended that the invention be limited to the specific terminology so set forth. Thus, the present invention is described in detail with reference to the above-described embodiments, but modifications, alterations, and variations can be made to one embodiment of the present invention without departing from the scope of the present invention, if those skilled in the art to which the present invention pertains have ordinary knowledge.

The scope of the present invention is defined by the claims to be described later, and all modifications and variations derived from the meaning and scope of the claims and the equivalent concept thereof should be construed as being included in the scope of the present invention.

Claims

1. A reversible torsion spring and rotary gear mounting structure, comprising:

a torsion spring;

a rotary gear including a rotary shaft having gear teeth formed on an outer circumferential surface thereof, the rotary shaft extending downward from a center thereof, the torsion spring being attached to the outer circumferential surface of the rotary shaft;

at least two guide rods formed to protrude downward from an upper surface of an outer side of the rotary gear, and restricting movement of one end and the other end of the torsion spring; and

a fixing portion formed on an inner surface of a housing, the housing covering the rotary gear, the housing forming an appearance of the EGR valve from the rotary gear;

the torsion spring includes a body-fixing ring,

the fixing portion covers the body fixing ring and prevents the body fixing ring from rotating.

2. The reversible torsion spring and rotary gear mounting structure according to claim 1,

the fixing portion is formed at a height corresponding to a half of the overall height of the torsion spring, and is provided with the torsion spring so that the rotation directions of the torsion spring at the upper portion of the fixing portion and the torsion spring at the lower portion of the fixing portion become opposite directions with respect to the fixing portion.

3. The reversible torsion spring and rotary gear mounting structure according to claim 1,

the body fixing ring is extended by a predetermined length in a centrifugal direction from a portion excluding both end portions of the torsion spring.

4. The reversible torsion spring and rotary gear mounting structure according to claim 3,

in order to control the opening angle of each of the normal rotation and the reverse rotation of the EGR valve for performing the normal rotation and the reverse rotation, the body fixing ring is provided to be spaced apart from the height corresponding to a half of the entire height of the torsion spring by a predetermined distance in the vertical direction.

5. The reversible torsion spring and rotary gear mounting structure according to claim 1,

the torsion spring performs forward rotation or reverse rotation by forming one spring in one direction.

6. The reversible torsion spring and rotary gear mounting structure according to claim 4,

the main body fixing ring is extended in a protruding manner in a horizontal or inclined shape with respect to the torsion spring.