KR102440854B1 - Gearbox mounting structure for vibration reduction - Google Patents

Abstract

Disclosed is a gearbox mounting structure for reducing vibration, comprising: a gearbox housing having a bracket to be installed on a mounting surface of a cross member; a fixer protruding from the mounting surface; and a mounting assembly installed on a lower surface of the bracket and inserted into the fixer and reducing the vibration of the gearbox. The mounting assembly includes: a universal joint installed on the center of the bracket to be rotatable; a mounting bracket installed on both ends of the universal joint; and a buffer adapter installed on both ends of the mounting bracket, and having an opening on a lower side, and having a guide groove along the circumferential direction on an inner side surface, and having a guide protrusions formed on the outer circumferential edge of the circumference of the fixer to correspond to and be inserted into the guide groove.

Description

Gearbox mounting structure for vibration reduction

The present invention relates to a gearbox mounting structure, and more particularly, to a gearbox mounting structure for reducing vibration that can reduce vibration of a gearbox and is easily mounted on a cross member.

In general, in the case of a vehicle, many gearboxes are used, and among them, the steering device is a device for changing the driving direction of the vehicle. It is composed of a steering gear mechanism that controls rotational force and transmits it to the steering link mechanism, and a steering link mechanism that transmits the movement of the steering gear mechanism to the wheels.

The steering gear mechanism includes a steering gearbox accommodating a plurality of gear members, and the steering gearbox is installed on one side of the vehicle body, ie, on a subframe, in a four-point support structure.

For example, the steering gearbox has a structure in which two mounting seating surfaces are formed on the left and right sides of the subframe, respectively, and four mounting parts of the steering gearbox are set on each of the mounting seating surfaces and then mounted by bolts. installed on the frame.

More specifically, the mounting pipe is installed in a form penetrating through the mounting seat surface of the subframe, and the gearbox mounting pipe installed with the rubber bush interposed in the mounting bracket of the steering gearbox is installed, and the mounting pipe of the subframe is installed. The steering gearbox may be installed in the subframe in a structure in which a penetrating bolt is mounted to the inner threaded portion of the gearbox mounting pipe.

However, as the gearbox mounting pipe is inserted and installed in the mounting bracket of the steering gearbox through the rubber bush, there is a problem in that the bolt mounting operation becomes difficult due to rotation of the rubber bush when the bolt is mounted.

In addition, there was a problem that only the rubber bush was insufficient to damp the vibration transmitted from the gearbox.

Republic of Korea Patent Publication No. 10-2014-0088634 (published on July 11, 2014)

SUMMARY OF THE INVENTION An object of the present invention is to provide a mounting structure of a gearbox capable of reducing vibration of the gearbox.

Another object of the present invention is to provide a mounting structure of a gearbox that is easily mounted in an assembly structure.

The mounting structure of the gearbox for vibration reduction according to the spirit of the present invention includes a gearbox housing providing a bracket to be installed on the mounting seat surface of a cross member, a fixture protruding from the mounting seat surface, and installed on the lower surface of the bracket and a mounting assembly that is inserted into the fixture to reduce vibration of the gearbox, wherein the mounting assembly includes a rotatable universal joint installed in the center of the bracket, and a mounting bracket that is supported and installed at both ends of the universal joint And, it is installed at both ends of the mounting bracket, the lower side is a hollow opening, a guide groove is formed along the circumferential direction on the inner surface to correspond to the guide protrusion formed in the circumferential outer periphery of the fixture It is to include a buffer adapter that is inserted .

According to an embodiment of the present invention, a spring may be included between the buffer adapter and the fixture.

According to an embodiment of the present invention, a buffer member may be further included between the mounting bracket and the buffer adapter.

According to an embodiment of the present invention, the buffer member includes a first buffer member installed on the mounting bracket and a second buffer member installed on the buffer adapter, wherein the first buffer member and the second buffer member are It can be installed in close contact with each other.

The mounting structure of the gearbox for vibration reduction according to the present invention has the effect of reducing vibrations generated by driving of the gearbox with the mounting assembly, thereby increasing the marketability.

In addition, there is an effect of improving the stability and riding comfort by reducing the vibration of the gearbox.

1 is a perspective view showing a cross member and a gearbox according to an embodiment of the present invention;
2 is a cross-sectional view of a mounting structure of a gearbox according to an embodiment of the present invention;
Figure 3 is an exploded perspective view of Figure 2,
4 is a cross-sectional view of a mounting structure of a gearbox according to another embodiment of the present invention;
5 is a cross-sectional view of a mounting structure of a gearbox according to another embodiment of the present invention.

The configuration shown in the embodiments and drawings described in this specification is only a preferred example of the disclosed invention, and there may be various modifications that can replace the embodiments and drawings of the present specification at the time of filing of the present application.

The same reference numbers or reference numerals in each drawing in this specification indicate parts or components that perform substantially the same functions. The shapes and sizes of elements in the drawings may be exaggerated for clear explanation.

The terminology used herein is used to describe the embodiments, and is not intended to limit and/or limit the disclosed invention. The singular expression includes the plural expression unless the context clearly dictates otherwise. In this specification, terms such as “comprise” or “have” are intended to designate that the features, numbers, steps, operations, components, parts, or combinations thereof described in the specification exist, but one or more other features It does not preclude the possibility of the presence or addition of numbers, steps, operations, components, parts, or combinations thereof.

As used herein, terms including ordinal numbers such as “first”, “second”, etc. may be used to describe various components, but the components are not limited by the terms, and the terms are one It is used only for the purpose of distinguishing a component from other components. For example, without departing from the scope of the present invention, a first component may be referred to as a second component, and similarly, a second component may also be referred to as a first component. The term “and/or” includes any combination of a plurality of related listed items or any of a plurality of related listed items.

Terms such as "... unit", "... group", and "module" described in the specification mean a unit that processes at least one function or operation, which is implemented by hardware or software or a combination of hardware and software can be Also, "a or an", "one", "the" and like related terms are used herein in the context of describing various embodiments (especially in the context of the claims that follow). Unless otherwise indicated or clearly contradicted by context, it may be used in a sense including both the singular and the plural.

The terms "upper", "lower", "front", "rear", etc. used below are defined based on the drawings, and the shape and position of each component is not limited by these terms.

Hereinafter, an embodiment according to the present invention will be described in detail with reference to the accompanying drawings.

Here, FIG. 1 is a perspective view showing a cross member and a gearbox according to an embodiment of the present invention, FIG. 2 is a cross-sectional view of a mounting structure of a gearbox according to an embodiment of the present invention, and FIG. 3 is an exploded perspective view of FIG. 4 is a cross-sectional view of the mounting structure of the gearbox according to another embodiment of the present invention, Figure 5 is a cross-sectional view of the mounting structure of the gearbox according to another embodiment of the present invention.

1 or 2 , the mounting structure of the gearbox in the present invention protrudes from the gearbox housing 200 mounted on the cross member 100 and the mounting seat surface 110 of the cross member 100 . It may include a mounting assembly 300 capable of reducing the vibration of the formed fixture 130 and the gearbox.

First, the gearbox is also referred to as a gear case, and may be a box-type frame in which various gears for transmitting power required to rotate the drive shaft are built in, and the frame is referred to as the gearbox housing 200 .

Here, the gearbox may be configured as, for example, a steering operation mechanism serving to transmit the driver's steering wheel operation force.

The gearbox housing 200 is mounted as a support structure on one side of the vehicle body, that is, on the mounting seat surfaces 110 at four places of the cross member 100 .

And a total of four mounting bearing surfaces 110 are formed on the left and right sides of the cross member 100, and the gearbox housing 200 can be mounted using each of the mounting bearing surfaces 110 formed in this way. do.

The four mounting seating surfaces 110 are spaced apart two each to form a pair, and thus, two pairs of mounting seating surfaces 110 may be formed to face each other.

A fixture 130 may be formed to protrude from each of these mounting seating surfaces 110 .

The fixture 130 will be described in detail again below.

A bracket 210 may be installed in the gearbox housing 200 toward the pair of mounting seating surfaces 110 .

The bracket 210 may have a flat plate shape having a predetermined width and thickness and may be installed integrally with the gearbox housing 200 or by welding or the like.

It may be preferable that two brackets 210 are installed on the gearbox housing 200 toward the two pairs of mounting seating surfaces 110 facing each other.

And the mounting assembly 300 is installed on the lower surface of each bracket 210 .

The mounting assembly 300 again largely includes a universal joint 310 , a mounting bracket 320 , and a buffer adapter 330 installed in the mounting bracket 320 and inserted and mounted in the fixture 130 .

The universal joint 310 is installed on the lower surface of the bracket 210 and serves to enable rotation in the left and right directions according to the vibration of the gearbox housing 200 .

The universal joint 310 is composed of a hinge bracket 312 installed in the center of the lower surface of the bracket 210 and a joint rod 316 rotating around the hinge pin 314 of the hinge bracket 312, and the joint rod 316 is formed so as to be divided into two parts to be balanced.

And mounting brackets 320 are installed to be supported on both ends of the joint rod 316 .

The mounting bracket 320 is also a flat plate having a certain thickness and width, and may have a smaller width or thickness than the bracket 210 .

Mounting brackets 320 may be integrally installed at both ends of the joint rod 316 .

As shown in FIG. 2, the mounting bracket 320 may be installed with bolts (reference numbers not assigned) and bushes (reference numbers not given), and the universal joint 310 and the mounting bracket 320 are integrally formed by an injection mold. may be formed as

Subsequently, the buffer adapter 330 may be installed at both ends of the mounting bracket 320 .

The buffer adapter 330 is inserted into the fixture 130 installed on the mounting seat surface 110 to fix the mounting assembly 300 like the gearbox housing 200 .

The buffer adapter 330 may be installed at both ends of the lower surface of the mounting bracket 320 and spaced apart to face each other.

And the buffer adapter 330 may have a hollow opening downward in a cylindrical shape, and a guide groove 332 is formed by being spaced a suitable distance along the circumferential direction on the inner surface of the hollow opening downward, the guide groove 332 may be formed along the longitudinal direction.

The guide groove 332 may be equal to the vertical length of the inner surface of the hollow.

On the other hand, the mounting portion 120 is integrally formed on each mounting seat surface 110 of the cross member 100 , and the fixture 130 may be formed to protrude upward on the mounting portion 120 .

The mounting part 120 is formed in a circular plate shape and integrated with the cross member 100 .

Therefore, the mounting part 120 and the fixture 130 can be made of the same aluminum material as the gearbox housing 200 made of an aluminum material.

In this way, the electrodeposition coating process can be performed in a state in which the mounting part 120 and the fixture 130 are integrally formed on the mounting seat surface 110 of the cross member 100 .

This is to eliminate the possibility of potential difference corrosion caused by the use of a dissimilar material between the cross member 100 made of a steel plate and the mounting part 120 and the fixture 130 made of aluminum.

As shown in FIG. 3 , the fixture 130 may have a guide protrusion 132 formed along the outer periphery.

The guide protrusion 132 is formed to correspond to the inner guide groove 332 of the buffer adapter 330 , so that the guide protrusion 132 can slide vertically along the guide groove 332 .

The guide protrusion 132 is formed to have the same length as the fixture 130 .

And in the present invention, the guide protrusion 132 may be formed in the buffer adapter 330 , and the guide groove 332 may be formed in the fixture 130 .

And the spring 340 is installed inside the hollow of the buffer adapter 330 so as to be supported on the upper end of the fixture 130, it is possible to buffer the vibration.

As shown in FIG. 2 again, the mounting assembly 300 is inserted into the fixture 130 to be mounted, and at this time, the lower end of the buffer adapter 330 by the spring 340 is spaced apart from the mounting part 120 to some extent. It may be desirable to be

The operation of the mounting structure of the gearbox according to the present invention having the above configuration will be described with reference to FIG. 2 or FIG. 3 .

First, to the bracket 210 of the gearbox housing 200, the universal joint 310, the mounting bracket 320, and the one-piece mounting assembly 300 consisting of the buffer adapter 330 are mounted on the fixture 130 of the mounting seat surface 110. ) is inserted into the

At this time, by inserting the guide groove 332 of the buffer adapter 330 in line with the guide protrusion 132 of the fixture 130, insertion and mounting is possible, and the upper end of the fixture 130 and the buffer adapter 330 inside. A spring 340 is located.

Accordingly, vibrations are generated by the operation of a plurality of gear members in the gearbox, and the vibrations are transmitted to the gearbox housing 200 .

The vibration of the gearbox housing 200 rotates left and right around the hinge pin 314 in the universal joint 310, that is, the mounting bracket 320 moves according to the left and right rotation of the joint rod 316. rotated like

The transmitted vibration absorbs the vibration while compressing the spring 340 in the buffer adapter 330 while the guide groove 332 of the buffer adapter 330 moves along the guide protrusion 132 of the fixture 130 .

According to the above-mentioned bar, by reducing vibration generated by the driving of the gearbox with the mounting assembly, it is possible to increase the marketability.

In addition, reducing vibration of the gearbox has the effect of improving stability and improving riding comfort.

And as another embodiment, as shown in FIG. 4 , a buffer member 350 may be further included between the mounting bracket 320 and the buffer adapter 330 .

The buffer member 350 may include a first buffer member 352 installed on the mounting bracket 320 and a second buffer member 354 installed on the buffer adapter 330 .

A first coupling groove 352a coupled to the mounting bracket 320 may be formed in the first cushioning member 352 , and a second coupling recess 352b may be formed to face the second cushioning member 354 .

The first coupling groove 352a is opened upward, where both end sides of the mounting bracket 320 are bent at right angles, and the bent mounting coupling part 322 is positioned in the first coupling groove 352a having the upper side opened. can be

In addition, the second coupling groove 352b may be provided with a predetermined space opened downward to include a second cushioning member 354 .

The second buffer member 354 is made of the same material as the first buffer member 352 and has a buffer projection 354a formed on the end side to be positioned in the second coupling groove 352b.

In addition, in FIG. 5 , a corrugated concave-convex coupling surface 356 is formed on the bonding surface of the first cushioning member 352 and the second cushioning member 354 facing each other, so that the vibration absorbing power can be improved as the coupling force is increased.

On the other hand, the first buffer member 352 and the second buffer member 354 are manufactured by mixing a binder material containing 1,2-polybutadiene and isobutylene, inorganic fillers and fiber fillers, and in the gearbox. It increases the absorption effect of the generated vibration.

As the binder, 1,2-polybutadiene and isobutylene are mixed in a weight ratio of 1:0.1 to 1:0.3, and 100 parts by weight is used.

The 1,2-polybutadiene has a crystallinity of 90 to 99.99%, a melting point of 70 to 110° C., a hardness of 30 to 50, and the isobutylene has a molecular weight of 2000 to 2500 g/mol, a viscosity of 4000 to 5000 cts, and a pour point of 10 to Use a temperature of 20 °C.

When the crystallinity of the 1,2-polybutadiene is less than 90%, rigidity cannot be imparted to the final product and the shape of the product cannot be maintained. There is a problem that the energy cost is excessive for commercialization.

When the hardness is less than 30, vibration damping properties are lowered, and when the hardness exceeds 50, there are problems of deterioration of workability and product cracking.

When the molecular weight of the isobutylene is less than 2000 g/mol, there is a problem in that vibration damping performance is lowered, when it exceeds 2500 g/mol, there is a problem in that high-temperature processability is reduced, when the viscosity is less than 4000 cts, the vibration damping performance is reduced, and when it exceeds 5000 cts There is a problem that high-temperature workability is lowered, and when the pour point is less than 10 °C, the elasticity is lowered, and when it exceeds 20 °C, the problem of excessive elasticity occurs.

The binder mixture has the highest self-modulus and is a thermoplastic resin, with a melting point of 70 to 100 ℃, first melted with 1.2-polybutadiene at 120 ℃ for 20 minutes while slowly stirring to form a liquid substance.

In addition, the inorganic filler has strength reinforcement and vibration damping performance improvement characteristics, and uses one or a mixture of two or more selected from talc, clay, calcium carbonate, mica and mica, and 50 to 250 with respect to 100 parts by weight of the binder. It is used in the range of parts by weight, and when less than 50 parts by weight is used, productivity is remarkably reduced, the rigidity of the buffer member cannot be secured, and when it exceeds 250 parts by weight, the bonding strength may be lowered.

Fiber fillers are effective in controlling the thermal fluidity of sheet products, and specifically, one or a mixture of two or more selected from paper, cotton, hemp, acrylic, nylon, and polyester can be used. It is more preferable to use polyester.

These fiber fillers are used in the range of 5 to 20 parts by weight based on 100 parts by weight of the binder, and when used in less than 5 parts by weight, the effect of controlling the fluidity of the buffer member and reinforcing the rigidity is low, so that the product shape cannot be maintained. When it exceeds 20 parts by weight, there may be a disadvantage of interfering with the fusion performance with the buffer adapter.

Although some aspects of the invention have been described in the context of an apparatus, it may also represent a description according to a corresponding method, wherein a block or apparatus corresponds to a method step or feature of a method step. Similarly, aspects described in the context of a method may also represent a corresponding block or item or a corresponding device feature.

In the above, specific embodiments have been shown and described. However, it is not limited to the above embodiments, and those of ordinary skill in the art to which the invention pertains can make various changes without departing from the spirit of the invention described in the claims below. .

100: cross member 110: mounting seat surface
120: mounting unit 130: fixture
132: guide projection 200: gear box housing
210: bracket 300: mounting assembly
310: universal joint 312: hinge bracket
314: hinge pin 316: joint rod
320: mounting bracket 322: mounting coupling part
330: buffer adapter 332: guide groove
340: spring
350: buffer member 352: first buffer member
352a: first coupling groove 352b: second coupling groove
354: second buffer member 354a: buffer projection
356: concave-convex coupling surface

Claims (4)

A gearbox housing that provides a bracket to be installed on the mounting surface of the cross member;
A fixture protruding from the mounting seat surface, and
and a mounting assembly installed on the lower surface of the bracket and inserted into the fixture to reduce vibration of the gearbox,
The mounting assembly is
A rotatable universal joint installed in the center of the bracket;
Mounting brackets supported and installed at both ends of the universal joint;
A buffer adapter installed at both ends of the mounting bracket, the lower part is hollow, and a guide groove is formed on the inner side in the circumferential direction to correspond to the guide protrusion formed on the circumferential outer periphery of the fixture;
including,
A spring is included between the buffer adapter and the fixture,
A buffer member is further included between the mounting bracket and the buffer adapter,
The buffer member,
a first cushioning member installed on the mounting bracket;
It consists of a second buffer member installed on the buffer adapter,
The first shock-absorbing member and the second shock-absorbing member are installed in close contact with each other,
A first coupling groove coupled to the mounting bracket and a second coupling groove coupled to the second buffer member are formed in the first cushioning member;
The first coupling groove is formed to open upward,
The mounting bracket is provided with a mounting coupling portion formed by bending both ends of the mounting bracket at a right angle;
The mounting coupling part is inserted into the first coupling groove and fixed in position,
The second coupling groove is formed by opening downward,
At the end side of the second buffer member, a buffer projection is formed to be inserted into the second coupling groove,
A corrugated concave-convex coupling surface is formed on a joint surface of the first buffer member and the second buffer member to increase the coupling force between the first buffer member and the second buffer member and improve vibration absorption,
The first buffer member and the second buffer member are formed to contain a binder containing 1,2-polybutadiene and isobutylene, inorganic fillers and fiber fillers;
The binder is composed of mixing the 1,2-polybutadiene and the isobutylene in a weight ratio of 1: 0.1 to 1: 0.3,
The 1,2-polybutadiene has a crystallinity of 90 to 99.99%, a melting point in the range of 70 to 110° C., and a hardness in the range of 30 to 50,
The isobutylene has a molecular weight of 2000 ~ 2500 g / mol, a viscosity of 4000 ~ 5000 cts, and a pour point of 10 ~ 20 ℃,
The inorganic filler is one or a mixture of two or more selected from talc, clay, calcium carbonate, mica and mica,
The fiber filler, paper, cotton, hemp, acrylic, nylon, and one or a mixture of two or more selected from polyester, the mounting structure of the gearbox for vibration reduction.
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