KR101732373B1 - Pumping device of seat for vehicle - Google Patents

Abstract

A pumping apparatus for a vehicle seat according to the present invention includes: a clutch unit for transmitting a rotational force input from a handle lever to a link means; A brake unit for fixing the link means; A front housing fixed to one side of the seat and having a space therein for accommodating the clutch portion and the brake portion; A lever bracket disposed outside the front housing, the lever bracket connecting the handle lever and the clutch portion; A return spring for generating a restoring force in a direction opposite to the rotational force to return the lever bracket to an initial position; And a first spring guide and a second spring guide which transmit the restoring force of the return spring to the lever bracket and are rotatably installed in the front housing, wherein the return spring, the first spring guide, 2 spring guide is disposed between the housing and the lever bracket.
The pumping device for a vehicle seat according to the present invention has a slim thickness to maximize space efficiency, minimizes noise generated during operation of the return spring, minimizes grease contamination, It is possible to facilitate the dimension control in manufacturing the spring and to prevent the spring release phenomenon that may occur in the spring action.

Description

Technical Field [0001] The present invention relates to a seat pumping apparatus for a vehicle,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicular seat pumping apparatus, and more particularly, to a pumping apparatus for operating a separate link mechanism provided in a seat by an operation force provided by a user to adjust a height of a seat and maintain a controlled height .

Generally, a driver's seat, an assistant seat and a seat for a passenger seat, which are installed in front and rear of a vehicle interior, are equipped with various convenience devices for the comfort of the passengers.

As the above-mentioned convenience device, there is provided a sliding function that can be adjusted by pushing and pulling back and forth according to the body shape of the passenger, and a reclining function for adjusting the inclination of the seat with respect to the backrest.

In addition, there is also provided a pumping device for raising or lowering the seat so as to adjust the height of the seat to the passenger, as shown in Fig.

The pumping device includes a lever unit, a clutch unit, and a brake unit. The lever unit receives a user's operating force and transmits the input to the clutch unit. And transmits the input operation force of the user to the link means of the seat, and the brake unit acts to block the power to be input in reverse and to fix the operated link means.

The lever unit includes a lever bracket that converts a vertical operation force of a handle lever installed at one side of the seat into a rotational force and transmits the rotational force to the clutch unit. The pumping device may further include a return unit for returning the handle lever and the lever bracket to their initial positions.

Generally, the return unit includes a return spring, and the handle lever and the lever bracket are returned to their initial positions after the user's operation force is released by the action of the return spring.

Korean Patent Registration No. 10-0490313 discloses that the spring hook, which is connected to the lever and is configured to be rotatable, directly contacts both ends of the return spring, and the initial positions of the spring hook and the return spring are the same as the return The return portion controlled by the stop member configured to contact the spring is disclosed, but in order to accurately control the initial position of the spring hook and the return spring hook, the dimensions of both ends of the spring hook and the return spring and the dimensions of the stop member must be kept very precise If the dimension accuracy is not maintained, a clearance is generated and rattle noise is generated during operation. In addition, since the return spring is disposed at the outer periphery of the pumping device, there is a possibility that a lubricant, particularly, grease leaks to contaminate the cover and the like, and the diameter of the pumping device itself also becomes large.

On the other hand, Korean Patent No. 10-0789641 discloses a configuration in which a resilient force is provided to the lever bracket by using a pair of springs (15) fitted in spring grooves halved in the circumferential direction in the spring stopper block. The main function units including the return unit are arranged in a line along the central axis, so that the size of the entire pumping apparatus is inevitably enlarged. Therefore, the pumping apparatus having such a configuration has a problem in that it is inefficient in terms of space utilization.

Korean Patent No. 10-0789641 discloses a pumping device that generates a restoring force by using a spring having the shape of a leaf spring. However, in the configuration in which the latching jaw of the lever bracket is in direct contact with the bending portions of both ends of the spring There is a possibility that a deficiency that the spring is released during the operation of the lever and fails to provide a restoring force may occur.

In order to solve the above-described problems, the present invention provides a return unit that is disposed outside the cylindrical body of the housing to reduce the thickness of the pumping device in the central axis direction to maximize space efficiency, Minimizes grease contamination for lubrication of the return spring, facilitates dimensional control during manufacture of the return spring by using a spring guide, and provides axial and radial deviation prevention means in the spring guide, And it is an object of the present invention to provide a pumping device for a vehicle seat that can prevent the vehicle from escaping.

In order to solve the above-mentioned problems, a pumping apparatus for a vehicle seat according to the present invention comprises: a clutch unit for transmitting a rotational force input from a handle lever to a link means; A brake unit for fixing the link means; A front housing fixed to one side of the seat and having a space therein for accommodating the clutch portion and the brake portion; A lever bracket disposed outside the front housing, the lever bracket connecting the handle lever and the clutch portion; A return spring for generating a restoring force in a direction opposite to the rotational force to return the lever bracket to an initial position; And a first spring guide and a second spring guide which transmit the restoring force of the return spring to the lever bracket and are rotatably installed in the front housing, wherein the return spring, the first spring guide, 2 spring guide is disposed between the front housing and the lever bracket.

The front housing includes a cylindrical body, and the first spring guide and the second spring guide are rotatably disposed around the cylindrical body at an outer side of the cylindrical body.

Further, the return spring is characterized by having a circular annular shape.

The first spring guide and the second spring guide each include a ring-shaped spring seating portion having a return spring disposed on an outer surface thereof, and a protrusion protruding in a radial direction from a center of the spring seating portion, Wherein the second spring is disposed on an outer circumferential surface of a spring seating portion of the first spring guide and on an outer circumferential surface of a spring seating portion of the second spring guide and one end of the return spring contacts the protrusion of the first spring guide, And is in contact with the projection of the guide.

The lever bracket may include a bracket leg extending toward the inside of the cylindrical body, and the bracket leg may extend between the protrusion of the first spring guide and the protrusion of the second spring guide.

The fixing device may further include a fixing member disposed between the protrusion of the first spring guide and the protrusion of the second spring guide.

When the bracket leg is rotated at a predetermined angle from the initial position and the protrusion of the first spring guide is rotated by the same angle as the predetermined angle by receiving the rotational force from the bracket leg, And is fixed in a state of being in contact with the fixing member so as to be prevented from rotating.

Further, the fixing member is provided in the front housing.

In addition, the fixing member is integrally formed with the front housing.

The return spring is a leaf spring having a rectangular cross section, and the first spring guide and the second spring guide have hooking jaws for preventing radial deviation of the return spring at positions where the return spring contacts both ends of the return spring Respectively.

The return spring has a circular cross section, and each of the return spring has a circular fastening portion at one end and the other end, and the first spring guide and the second spring guide have a fastening boss for engaging with the fastening portion Respectively.

In addition, the first spring guide or the second spring guide may include a separation preventing jaw that prevents the return spring from moving in the central axis direction.

The maximum height of the separation preventing jaw measured from the outer circumferential surface of the spring seat portion is larger than the maximum distance from the outer circumferential surface to the return spring when the return spring is deformed to the maximum.

The separation preventing jaw may be disposed at a position where the maximum gap is generated.

The maximum height of the separation preventing jaw measured from the outer circumferential surface of the spring seat portion is greater than or equal to a sum of the distance from the outer circumferential surface to the return spring and the thickness of the return spring when the return spring is fully deformed .

The pumping device for a vehicle seat according to the present invention has a slim thickness and can maximize space efficiency.

Further, the pumping device for a vehicle seat according to the present invention can minimize the noise generated during operation of the return spring and minimize the contamination with grease.

In addition, the pumping device for a vehicle seat according to the present invention can easily manage the dimension when manufacturing the return spring by using the spring guide, and can prevent the spring release phenomenon that may occur in the spring action.

1 is a view showing a vehicle seat having a height adjustment function.
2 is an exploded perspective view of a pumping apparatus for a vehicle seat according to an embodiment of the present invention.
3 is an exploded perspective view of the pumping device of FIG.
Fig. 4 is a cross-sectional view of the pumping device shown in Figs. 2 and 3, cut in a direction perpendicular to the central axis direction.
5 is a partially enlarged view of the cut-away surface shown in Fig.
6 is a cross-sectional view showing a state in which a rotational force is transmitted from the initial state of FIG. 4 to the lever bracket in a clockwise direction and is rotated.
7 is a partially enlarged view of the section shown in Fig.
8 is a cross-sectional view showing a state in which a rotational force is transmitted from the initial state of FIG. 4 to the lever bracket in a counterclockwise direction and is rotated.
9 is a partially enlarged view of the cut-away surface shown in Fig.
10 and 11 are views for explaining a modification of the return spring 230 according to the present invention.
12 is a diagram showing a state in which a gap existing between the return spring 230 and the spring guides 241 and 242 is increased.
13 (a) and 13 (b) are views for explaining the separation preventing tab of the return spring according to the present invention.
14 and 15 are views for explaining another embodiment of the return spring according to the present invention.
16 and 17 are views for explaining another embodiment of the spring guide according to the present invention.

Hereinafter, a pumping apparatus for a vehicle seat according to the present invention will be described in detail with reference to the accompanying drawings.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It should be understood that the present invention is not intended to be limited to the specific embodiments but includes all changes, equivalents, and alternatives falling within the spirit and scope of the present invention.

In describing the present invention, the terms first, second, etc. may be used to describe various components, but the components may not be limited by the terms. The terms are only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.

The term " and / or " may include any combination of a plurality of related listed items or any of a plurality of related listed items.

When an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, but other elements may be present in between Can be understood. On the other hand, when it is mentioned that an element is "directly connected" or "directly connected" to another element, it can be understood that no other element exists in between.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions may include plural expressions unless the context clearly dictates otherwise.

In the present application, the terms "comprises", "having", and the like are used interchangeably to designate one or more of the features, numbers, steps, operations, elements, components, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, parts, or combinations thereof.

Unless otherwise defined, all terms used herein, including technical or scientific terms, may have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries can be interpreted as having a meaning consistent with the meaning in the context of the relevant art and are, unless expressly defined in the present application, interpreted in an ideal or overly formal sense .

In addition, the following embodiments are provided to explain more fully to the average person skilled in the art. The shapes and sizes of the elements in the drawings and the like can be exaggerated for clarity.

FIG. 2 is an exploded perspective view of a pumping apparatus for a vehicle seat according to an embodiment of the present invention, and FIG. 3 is an assembled perspective view of the pumping apparatus of FIG.

2 and 3, a pumping apparatus for a vehicle seat according to the present invention includes a clutch unit 260 for transmitting a rotational force input from the handle lever of FIG. 1 to a link means, a brake unit 270), a front housing (250) fixed to one side of the seat and having a space for accommodating the clearance and the brake unit therein, and a front housing (250) disposed outside the front housing and connecting the handle lever A return spring 230 for generating a restoring force in a direction opposite to the rotational force to return the lever bracket to an initial position, a lever bracket 212 for transmitting a restoring force of the return spring to the lever bracket, And a first spring guide 241 and a second spring guide 242,

The front housing 250 includes a cylindrical body portion and a side flange 253 which are coupled to the rear cover 280 to form an internal space. The body portion includes a shaft hole 252 and a guide slot 255, And a fastening hole 254 is formed in the side flange 253.

That is, the front housing 250 is formed with a shaft hole 252 at the front center position, a side flange 253 formed on both sides thereof, a plurality of fastening holes 254 formed on the side flange 253, A guide slot 255 that is substantially concentric with the shaft hole 252 is formed.

Here, the guide slot 255 is a stopper (not shown) of the lever bracket 210 that converts the up / down operation of the handle lever 100 into a rotary motion and transmits operating force to the input shaft 261, The rotation angle of the stop leg connected to the handle lever 100 by the guide slot 255 is limited.

The rear cover 280 is coupled to the open rear face of the front housing 250 and has a shaft hole 281 formed at a front center position and a side flange 282 formed on both sides thereof. A plurality of fastening pins 283 inserted into the fastening holes 254 of the front housing 250 are formed.

The front housing 250 and the rear cover 280 are formed with through holes on the respective side flanges 253 and 282 so that they are fastened to each other through fastening means through the through holes.

The front housing 250 and the rear cover 280 may be formed by drilling the shaft holes 212 and 281 so as to substantially conform to the center axis AA of the pumping device 200 to form the clutch portion 260 and the brake portion 270 Is aligned with the central axis AA.

Meanwhile, the clutch unit 260 has the following structure.

The clutch unit 260 includes an input shaft 261 inserted into the front housing 250 and one end fixedly coupled to the lever bracket 210 and a plurality of engagement members 261 disposed at predetermined intervals along the outer circumferential surface of the input shaft 261, And a clutch drum 262 that rotates in conjunction with the rotation of the input shaft 261 through frictional contact with the connector 263.

The lever bracket 210 is connected to a handle lever 100 whose front surface is connected to adjust the height of the seat 300. A shaft hole 212 is formed at the center of the lever bracket 210 to receive the input shaft 261, A stop leg (not shown) passing through the guide slot 255 of the front housing 250 in the direction AA is formed.

The tip of the input shaft 261 penetrates the shaft hole 252 of the front housing 250 and is inserted and fixed in the shaft hole 212 of the lever bracket 210. The rear end of the input shaft 261 is located in the inner space of the front housing 250 And an insertion hole into which the tip of the output shaft 272 is inserted is formed in the center portion. At this time, a plurality of concave curved or planar cam surfaces are radially formed on the outer peripheral surface of the rear end of the input shaft 261. Preferably, the cam surfaces are formed on the outer circumferential surface of the input shaft 261 at regular intervals.

And a cam follower 263 is disposed on each of the cam surfaces, wherein each cam face and the cam followers 263 are disposed to correspond to each other on a one-to-one basis. The engaging member 263 is restrained between the cam surface and the inner circumferential surface 262a of the clutch drum 262 so that the engaging member 263 can move along with the cam surface upon rotation of the input shaft 261. [ Such a connector 263 may be formed in the form of a ball or a roller, or any other shape.

Meanwhile, a clutch spring 220 may be provided to provide an elastic restoring force for returning the ligature 263 to the initial position. There is no limitation on the structure of the clutch spring 220, but an annular spring is preferable considering the thickness of the pumping device in the direction of the central axis A-A as shown in Fig. When the user rotates the lever bracket 210 using the handle lever 100, the connector 263 is rotated in the same direction and the clutch spring 220 is compressed in the rotating direction. Thereafter, when the rotational force applied to the lever bracket 210 is released, the connector 263 and the input shaft 261 are returned to their initial positions by the elastic restoring force of the compressed clutch spring 220.

The rear end of the input shaft 261 on which the cam surface is formed is located at the center of the clutch drum 262 and a pressing surface 262a is formed on the inner peripheral surface of the center of the clutch drum 262 . A coupling member 263 is inserted between each of the cam surfaces formed on the outer circumferential surface of the input shaft 261 and the pressing surface 262a of the clutch drum 262. The coupling member 263 is engaged with the input shaft 261 And is in contact with the cam surface and the pressing surface 262a of the clutch drum 262, respectively.

The engaging member 263 is in frictional contact with the cam surface of the input shaft 261 and the pressing surface 262a of the clutch drum 262 in the course of the rotation of the input shaft 261 so that the rotational torque of the input shaft 261 Can be transmitted to the clutch drum 262 through the coupler 263. [

A plurality of protruding legs 262b extending in the direction of the center axis AA are formed on the outer circumferential surface of the clutch drum 262. The protruding legs 262b protrude from the output member 272, So that the rotational force of the clutch drum 262 can be transmitted to the output member 272. In this way,

Next, the configuration of the brake unit 270 will be described. The brake unit 270 is not limited to the embodiments described below, but may be modified in various other ways.

As described above, the brake unit 270 includes an output member 271 having a wedge boss protruding from the outer circumferential edge thereof, and an output member 272 coupled to the output member 271 to be inserted into the shaft hole 281 of the rear cover 280 An output shaft 272 provided with an output gear meshed with the link side sector gear and a roller member 272 disposed on the output member 271 side and generating a braking force by frictional force with respect to the front housing 250.

The output member 271 and the output shaft 272 may be integrally formed by forced press-fitting. The output member 271 and the output shaft 272 are coupled to each other through a latch hole. have.

A plurality of wedge bosses are formed on the outer circumferential surface of the output member 271 so as to protrude radially at regular intervals, and the protruding legs 262b of the clutch drum are inserted between the respective wedge bosses.

Further, on the outer circumferential surface of the output member 271, a roller position surface into which the first and second roller shafts of the roller member are inserted is formed with the respective wedge bosses interposed therebetween. And the roller position surfaces extend to the confining section surface protruding from the outer circumferential surface of the output member. The restricting section surface is configured to reduce the interval between the front housing 250 and the output member 271 to realize the wedge action with respect to the roller member 273 so that the output member 271 is restrained with a strong braking force, It is possible to prevent the rotation of the motor.

The output gear 272 meshes with the link side sector gear, raises or lowers the link side when breaking the brake force, and restrains the movement of the link side when the brake force is generated.

The roller member 273 is constituted by a pair of first and second roller shafts and a seat spring which is positioned between the first and second roller shafts and pushes the first roller shaft and the second roller shaft, respectively. The insert spring has a structure that wraps the wedge boss of the output member 271 and pushes the first and second roller shafts positioned on both sides, respectively, and thus forms an "M" shape.

As shown in the figure, the first and second roller shafts, which are assembled on the roller position surface of the output member 271 on the side of the wedge boss and receive a pushing force from the insert spring, move along the roller position surface The rotation of the output member 271 can be restrained. As a means for returning the handle lever 100 and the lever bracket 210 to their initial positions when the rotational force applied to the lever bracket 210 is released through the handle lever 100, And first and second spring guides 241 and 242 that transmit the restoring force of the return spring 230 to the lever bracket 210 and are rotatably installed in the front housing 250.

The return spring 230 is disposed between the first and second spring guides 241 and 242. 3, the first spring guide 241, the second spring guide 242, and the return spring 230 are installed on the outer surface of the cylindrical body of the front housing 250. The first spring guide 241 and the second spring guide 242 may have substantially the same shape and structure and are inserted into the cylindrical body portion of the front housing 250 while facing each other when installed in the cylindrical body portion.

The pumping device 200 according to the present invention is configured such that the structure including the return spring 230 and the first and second spring guides 241 and 242 is disposed outside the cylindrical body portion of the front housing 250 It is possible to maximize the space efficiency by having a slim thickness in the direction of the central axis AA. The return spring 230 of the present invention is applied to a leaf spring other than a coil spring or a circular spring having a circular cross section as described later. Accordingly, it is possible to minimize the use of the lubricant, particularly, the grease used in the application of the coil spring, and to prevent the contamination problem due to the leakage of the lubricant which may be caused thereby.

The specific structure and operation of the first spring guide, the second spring guide 241, and the return spring 230 will be described later with reference to FIG. 4 to FIG.

4 is a cross-sectional view of the pumping device 200 shown in Figs. 2 and 3 taken along a direction perpendicular to the central axis AA. In the state before the rotational force is transmitted to the lever bracket 210, Fig. 5 is a partially enlarged view of a section shown in Fig. 4. Fig. FIG. 6 is a cross-sectional view showing a state in which a rotational force is transmitted to the lever bracket 210 from an initial state of FIG. 4 in a clockwise direction and is rotated, and FIG. 7 is a partially enlarged view of the section shown in FIG.

4 and 5, the first spring guide 241 and the second spring guide 242 of the present invention are rotatably disposed on the outer circumferential surface of the cylindrical body portion, and a return spring is disposed on the outer surface thereof Shaped spring seat portions 241a and 242b and radial protrusion portions 241b and 242b projecting from the center of the center of the spring seat portions 241a and 242a, And the return spring 230 is disposed on the outer surface of the spring seating portion 241a of the first spring guide and the outer surface of the spring seating portion 242a of the second spring guide, (241b), and the other end of the return spring contacts the protrusion (242b) of the second spring guide.

The return spring 230 having a circular ring shape partly extends in the direction of the central axis of the pumping device 200 over the outer peripheral surface of the spring seating portion 241a of the first spring guide 241, And is disposed over the outer peripheral surface of the spring seating portion 242a of the guide 242. [

The lever bracket 210 includes a bracket leg 211 extending toward the inside of the cylindrical body portion and the bracket leg 211 is engaged with the protrusion 241b of the first spring guide and the second spring guide 211. [ As shown in Fig.

Further, a protrusion 241b of the first spring guide and a protrusion 242b of the second spring guide protrude from the front housing 250 in a direction opposite to the extending direction of the bracket leg 211, 251 are disposed. That is, unlike the prior art, the return spring 230 does not directly contact the fixing member 251 and the bracket leg 211, and does not need to bend the return spring 230. Therefore, the dimension of the return spring 230 can be more easily managed, and there is a greater possibility of malfunction than when the return spring comes into direct contact with the fixing member and the bracket legs and when the bending is formed at both ends of the return spring. .

Meanwhile, the return spring 230 acts on the restoring force in the following manner.

4 and 5, and the protrusion 241b of the first spring guide receives a rotational force from the bracket leg 211 and receives the rotational angle of the bracket leg 211 at the same angle as the predetermined angle The protrusion 242b of the second spring guide 242 is fixed in contact with the fixing member 251 by the fixing member 251 and is prevented from rotating.

In order to make the return spring 230 deformed as shown in FIG. 6 from the initial state shown in FIGS. 4 and 5 to generate a restoring force, one end of the return spring 230 is moved as a free end When the return spring 230 is deformed, the other end of the return spring 230 must be fixed as a fixed end.

6 and 7, when the bracket leg 211 rotates clockwise to simultaneously rotate the protrusion 242b of the second spring guide 242, the protrusion 241 of the first spring guide 241 241b are transmitted with rotational force by the return spring 230, but are prevented from rotating in the clockwise direction by the fixing member 251. [ As a result, as the protrusion 242b of the second spring guide 242 rotates, the return spring 230 is deformed and the elastic force to return to the original shape is transmitted to the protrusion 241b of the first spring guide 241 and the second spring guide 242b The projecting portion 242b of the second spring guide 242 is moved by the action of the return spring 230 when the rotational force transmitted to the lever bracket 211 is released by simultaneously acting on the protruding portion 242b of the spring guide 242 And returns to the initial position in Figs. 4 and 5. The protrusion 241b of the first spring guide 241 is prevented from rotating clockwise by the action of the fixing member 251 while the protrusion 242b of the second spring guide 242 returns to the initial position, It remains stationary.

Of course, even when the bracket leg 211 rotates in the opposite direction, that is, counterclockwise according to the present invention, the return spring 230 of the present invention can effectively generate the restoring force. 8 and 9 show a case in which the protruding portion 241b of the bracket leg 211 and the first spring guide 241 are rotated counterclockwise from the initial position.

6 and 7, the protrusion 241b of the first spring guide 241 acts as a free end and the protrusion 242b of the second spring guide 242 acts as a fixed end And the return spring 230 can effectively generate the restoring force.

The return spring 230 according to the present invention is preferably an annular plate spring having a rectangular cross section as an embodiment. Figs. 4 to 9 show an embodiment in which a leaf spring is applied.

A part of the return spring 230 is in contact with the outer circumferential surface of the spring seating portion 241a of the first spring guide 241 and the remaining portion is in contact with the outer circumferential surface of the spring seating portion 242a of the second spring guide 242, But it is not necessary to make direct contact with these outer circumferential surfaces. That is, as shown in the figure, the outer circumferential surface of the spring seating portion 241a of the first spring guide 241 and the outer circumferential surface of the spring seating portion 242a of the second spring guide 242 may be spaced apart from each other. Therefore, the use of the lubricant can be excluded or the amount of use thereof can be minimized as compared with the conventional method using the coil spring-type return spring.

One end of the return spring 230 is in direct contact with the protrusion 241b of the first spring guide 241 as described above since the one end of the return spring 230 must be fixed and the other end thereof must be rotatable. And the other end of the return spring 230 is in direct contact with the protrusion 242b of the second spring guide 242. [

On the other hand, since the annular return spring 230 can be deformed and released in its radial direction while the bracket leg 211 rotates, a means for preventing such disengagement is needed. As the means for preventing the return spring 230 from radially deviating, the engaging protrusions 241c and 242c are provided at the portions where the protruding portions 241b and 242b of the spring guides 241 and 242 contact the both ends of the return spring 230, Respectively.

7 and 9, the return spring 230 is provided with a latch jaw 241c at a position where the return spring 230 contacts the protrusion 241b of the first spring guide 241, And a latching jaw 242c is provided at a position where the second spring guide 242 contacts the projection 242b. 7 and 9, even when the return spring 230 is deformed and the respective ends are subjected to a force radially deviating, the return spring 230 is rotated in the radial direction by the action of the stoppers 241c and 242c So that it is possible to stably perform the function.

10 and 11 are views for explaining a modification of the return spring 230 according to the present invention.

Fig. 10 shows the return spring 230 in the initial state, and Fig. 11 shows the return spring 230 in the fully deformed state. The return spring 230 of the present invention can be designed to have a generally circular shape when mounted on the first spring guide 241 and the second spring guide 242, 11, it is assumed that the return spring 230 maintains a substantially circular outer shape even in the state of being deformed to the maximum as shown in FIG. 11, and the radius of the return spring 230 Directional deformation can be calculated.

The center of the circular return spring 230 is A and the radius is R1. It is assumed that the left end 230a of the illustrated return spring 230 is a fixed end and the right end 230b is a free end.

An angle between the left end portion 230a and the right end portion 230b in the initial state is referred to as a first angle? 1 and an angle between the left end portion 230a and the right end portion 230b in the maximum deformation state is referred to as a second angle? , The radius R2 in the maximum deformation state can be calculated as follows. (A in Fig. 11 is the center of the return spring 230 in the initial state, and C corresponds to the center of the return spring 230 in the fully deformed state)

R2 = [(? 2 -? 1) / (2?) + 1] * R1

Here, π is the circularity.

Therefore, the radius of the return spring 230 after deformation corresponding to R1 * (? 2 -? 1) / (2?) Is further increased.

The end portions 230a and 230b of the return spring 230 are held in contact with the protrusions 241b and 242b of the first and second spring guides 241 and 242, The gap between the return spring 230 and the first and second spring guides 241 and 242 is further widened at portions opposite to the opposite ends 230a and 230b of the spring 230.

The material of the return spring 230 of the present invention is not limited. Regardless of metal and non-metal materials, materials with a certain elasticity can be applied without limitation. However, it is preferable to design the return spring 230 so as to have a material and a thickness such that the portion where the maximum stress is generated does not cause plastic deformation when the maximum deformation occurs as shown in FIG.

12 shows a state in which the increased distance is reflected in the interval existing between the return spring 230 and the first and second spring guides 241 and 242 in the initial state. In this case, there is a portion where the maximum gap between the return spring 230 and the first and second spring guides 241 and 242 is generated, and the maximum gap gmax is calculated in a manner as described above .

On the other hand, due to a manufacturing error, both end portions 230a and 230b of the return spring 230 may not be precisely perpendicular to the circumferential direction. In this case, as described above, while the return spring 230 begins to deform and causes the maximum deformation, the return spring 230 is subjected to a force causing the deviation in the center axis direction.

Therefore, when the return spring 230 is deformed and deviates from the original position in the direction of the central axis, the return spring 230 may fail to return to the original position due to interference with the adjacent member or the like. Is required.

13, the first spring guide 241 or the second spring guide 242 may be provided to prevent the return spring 230 from being displaced in the central axis direction, And at least one separation preventing jaw 241d, 242d for preventing separation in the central axis direction.

The first spring guide 241 and the second spring guide 242 may have the release preventing jaws respectively, or only one of them may have the release preventing jaws. Preferably, the spring guide disposed closer to the lever bracket 210 may be provided with a release preventing tab.

The height h of the separation preventing jaw is greater than the maximum gap gmax between the return spring 230 and the first and second spring guides 241 and 242 and is preferably greater than the maximum gap gmax and the return spring 230). ≪ / RTI >

The release spring may be provided on at least one or more of the spring seating portions 241a and 242a of the first spring guide 241 or the second spring guide 242, 2 spring guides 242. The spring seating portions 241a and 242a of the spring guide 242 may be provided continuously in the circumferential direction.

13A shows a case in which the release preventing tab is provided at a part of the spring seating portion 242a of the second spring guide 242. As shown in Fig. 13A, a portion of the spring seating portion 242a It is preferable that the separation preventing jaw is provided at a position where the distance between the return spring 230 and the spring seating portions 241a and 242a of the spring guides 241 and 242 is maximized.

On the other hand, FIG. 13 (b) illustrates a case in which the separation preventing jig is provided in a continuous shape around the circumferential direction of the spring seating portion 242a of the second spring guide 242.

FIGS. 4 to 13 illustrate an exemplary embodiment in which the return spring 230 has a rectangular cross section, but the present invention is not limited thereto. 14-17 illustrate an embodiment in which the end of the return spring 230 is a circular spring.

The return spring 230 shown in Figs. 14 to 17 is not different from the return spring shown in Figs. 4 to 13 except that the cross section is circular. However, there is a need for another structure for preventing the separation of the central axis A-A in consideration of the fact that the cross section is circular.

The description of the return spring of Figs. 4 to 13 can be effectively applied to the return spring 230 shown in Figs. 14 to 17, except for the structure for preventing the deviation in the center axis AA described below And a description thereof will be omitted.

14 and 15 are views showing another embodiment of the return spring according to the present invention. Fig. 14 shows an initial state, and Fig. 15 shows a state in which the return spring is deformed.

Referring to FIGS. 14 and 15, the return spring 230 according to another embodiment of the present invention includes circular fastening portions 231 at both ends. Since the return spring 230 of the present embodiment has an annular spring structure having a circular section, when both ends of the return spring 230 are applied to the return spring of the embodiment shown in Figs. 4 to 13, The structure for preventing radial deviations of the first and second protrusions can be complicated. Therefore, for the radial deviation function, the return spring 230 of the present embodiment has circular fastening portions 231 at both ends thereof. This fastening portion 231 can be easily formed by bending both ends of the return spring 230 in a circular shape.

16, the first spring guide 241 and the second spring guide 242 protrude in the direction of the central axis AA to the respective projecting portions 241b and 242b And fixing bosses 241e and 242e. Preferably, the fastening boss 241e of the first spring guide 241 and the fastening boss 242e of the second spring guide 242 are configured to protrude in directions opposite to each other. For example, the fastening boss 241e of the first spring guide 241 may protrude downward with reference to the drawing, and the fastening boss 242e of the second spring guide 242 may face upward As shown in Fig.

The radial deviation of the return spring 230 can be easily prevented through the simple structure as described above.

On the other hand, although not shown, the axial deviation preventing jaw shown in Fig. 13 can be effectively applied to this embodiment.

As described above, it is to be understood that the technical structure of the present invention can be embodied in other specific forms without departing from the spirit and essential characteristics of the present invention.

It should be understood, therefore, that the embodiments described above are to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than the foregoing description, And all changes or modifications derived from equivalents thereof should be construed as being included within the scope of the present invention.

Claims (15)

A clutch unit for transmitting a rotational force input from the handle lever to the link means;
A brake unit for fixing the link means;
A front housing fixed to one side of the seat and having a space therein for accommodating the clutch portion and the brake portion;
A lever bracket disposed outside the front housing, the lever bracket connecting the handle lever and the clutch portion;
A return spring that generates a restoring force in a direction opposite to the rotational force to return the lever bracket to an initial position and has a circular annular shape; And
A first spring guide and a second spring guide that transmit restoring force of the return spring to the lever bracket and are rotatably installed in the front housing;
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Wherein the return spring, the first spring guide, and the second spring guide are disposed between the front housing and the lever bracket,
Wherein the first spring guide and the second spring guide each include a ring-shaped spring seating portion having a return spring disposed on an outer surface thereof, and a projection projecting in a radial direction from a center of the spring seating portion,
Wherein the return spring is disposed on an outer circumferential surface of the spring seating portion of the first spring guide and an outer circumferential surface of the spring seating portion of the second spring guide,
Wherein one end of the return spring is in contact with the protrusion of the first spring guide and the other end of the return spring is in contact with the protrusion of the second spring guide. The method according to claim 1,
Wherein the front housing includes a cylindrical body portion,
Wherein the first spring guide and the second spring guide are rotatably disposed on the outer side of the cylindrical body part about the cylindrical body part. delete delete 3. The method of claim 2,
The lever bracket including a bracket leg extending toward the interior of the cylindrical body portion,
Wherein the bracket leg extends between a protrusion of the first spring guide and a protrusion of the second spring guide. 6. The method of claim 5,
Further comprising a fixing member disposed between the protrusion of the first spring guide and the protrusion of the second spring guide. The method according to claim 6,
When the bracket leg is rotated at an angle from the initial position and the projecting portion of the first spring guide is rotated by the same angle as the predetermined angle by receiving the rotational force from the bracket leg, And is fixed in contact with the member to prevent rotation. 8. The method of claim 7,
Wherein the fixing member is provided on the front housing. 9. The method of claim 8,
Wherein the fixing member is integrally formed with the front housing. The method according to claim 1,
The return spring is a leaf spring having a rectangular cross section,
Wherein the first spring guide and the second spring guide each have a hooking protrusion at a position where the first spring guide and the second spring guide come in contact with both ends of the return spring to prevent radial deviation of the return spring. The method according to claim 1,
The end surface of the return spring is circular,
Wherein a circular fastening part is provided at one end and the other end of the return spring, respectively,
Wherein the first spring guide and the second spring guide each have a fastening boss for engaging with the fastening part. The method according to claim 1,
Wherein the first spring guide or the second spring guide includes a separation preventing jaw that prevents the return spring from being displaced in the central axis direction. 13. The method of claim 12,
Wherein the maximum height of the separation preventing jaw measured from the outer circumferential surface of the spring receiving portion is greater than the maximum distance from the outer circumferential surface to the return spring when the return spring is fully deformed. 14. The method of claim 13,
And the separation preventing jaw is disposed at a position where the maximum gap is generated. 13. The method of claim 12,
Wherein the maximum height of the separation preventing jaw measured from the outer circumferential surface of the spring seat portion is equal to or greater than a sum of the distance from the outer circumferential surface to the return spring and the thickness of the return spring when the return spring is deformed to the maximum, Pumping device.

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