KR101321776B1 - Hydraulic type clearance compensation device - Google Patents

Abstract

PURPOSE: A hydraulic gap compensating device is provided to improve the sense of steering with a fluid pressure and efficiently absorb flow and impact by pressurizing and damping the outer circumference of a bearing of a worm shaft with the movement of the fluid pressure and the elasticity of a spring. CONSTITUTION: A hydraulic gap compensating device includes a body (10), a pressurization member (20), a sheet (30), a return spring (40), a check member (50), and a gap unit. The body is installed in a housing including a worm wheel and a worm shaft. The pressurization member is installed in an installation unit (12) of the body to be able to move forward and backward. The pressurization member includes an accommodation unit in which oil is filled and a contact protrusion unit (22) coming into contact with the outer circumference of a bearing of the worm shaft. The sheet stores oil in a first pressure chamber by being inserted into the accommodation unit. The sheet forms a second pressure chamber in which the other oil is accommodated to be connected to the first pressure chamber by a penetration hole (34). The return spring is installed in the first pressure chamber and supplies elasticity to the pressurization member. The check member blocks the penetration hole when the pressurization member moves backwards and opens the penetration hole when the pressurization member moves forwards. The gap unit is formed in between the inner diameter of the accommodation unit and the outer diameter of the sheet with a predetermined space and moves the oil of the first pressure chamber to the second pressure.

Description

Hydraulic play compensation device {HYDRAULIC TYPE CLEARANCE COMPENSATION DEVICE}

The present invention relates to a hydraulic play compensation device, and more particularly, by using the hydraulic movement and the elasticity of the spring to pressurize and damp the outer circumferential surface of the bearing of the worm shaft, to efficiently absorb the flow and impact, and improve the steering feeling It relates to a hydraulic play compensation device that can be made.

In general, the motor power steering (MDPS) is a power steering that assists the driver's steering power by using the driving force of the motor, and receives steering information from the sensor and vehicle speed and vehicle status information from the ECU. It is a structure that generates a motor control signal to implement an appropriate auxiliary steering force.

In addition, the gearbox, which is a steering gear of the electric power steering, drives the motor according to the control signal received from the ECU. The driving force of the motor is decelerated and boosted through the reduction gear composed of a worm and a worm wheel gear to perform bowing.

1 is a configuration diagram showing a conventional electric power steering, Figure 2 is a state diagram of the clearance compensation device installed in the conventional electric power steering reducer.

The conventional electric power steering 3 is provided in the column 2 of the steering wheel 1. The electric power steering 3 includes a worm shaft 4 that rotates by the power of a drive motor, a worm wheel 5 that engages teeth of the worm shaft 4 to transmit power to the column 2, and a worm shaft. Press the outer circumferential surface of the bearing (6) provided at the end of the (4) to close the worm shaft (4) to the worm wheel (5) side, so as to reduce the rattle coupling caused by the gap generated in the housing (7) And a coil spring 9 supported by a blocking cap installed in the housing 7 so as to provide an elastic force to the pressing member 8, and a pressing member 8 inserted into the pressing member 8.

In this state, when driving on the rough road of the vehicle, irregular road surface information is input or gravel shock is transmitted to the tire, thereby the gearbox is excited, and the worm wheel 5 is moved left and right by the excitation of the universal joint of the column. Excitation, the impact sound of the worm wheel (5) and the worm shaft (4) due to the reverse input (propagation) can be propagated to the outside to cause an uncomfortable feeling to the driver. In order to reduce this, the end of the pressing member (8) receiving the elastic force of the coil spring (9) presses the outer circumferential surface of the bearing (6) provided at the end of the worm shaft (4), it is utilized as a play compensation device.

As such, the existing play compensation device utilizes a combination of the pressing member 8 and the coil spring 9.

Patent Publication No. 10-2011-0064018 has been proposed as an invention for a conventional electric power steering device.

Conventional electric power steering is more likely to generate mechanical rattle joints because it consists only of mechanical link structure compared to hydraulic power steering for input of external road surface or impact load. Backlash and flow impact between inner / outer race of bearing and ball and inner / outer race of bearing with external worm and worm wheel against external impact load, impact sound due to backlash and flow inside connection structure between mechanical link The back often developed into a rattle joint.

In particular, when the pressing force of the coil spring is large to reduce the impact noise of the worm wheel and the worm shaft, the friction resistance, torque fluctuation and vehicle restoring force are increased to make steering difficult, and when the pressing force of the coil spring is weak, the frictional resistance is reduced, The resilience is improved, but the gap between the worm wheel and the worm shaft is loose, resulting in a large rattle joint.

However, the pressurizing member used as the clearance compensation device of the conventional electric power steering presses the outer circumferential surface of the worm shaft in dependence on the elastic force of the coil spring, thereby not only effectively absorbing the play of the bearing of the worm shaft, but also Since shock absorbing is mechanical, steering wheel steering may not provide a smooth emotional quality to the driver.

Therefore, there is a need to improve this.

The present invention has been created by the necessity as described above, by using the hydraulic pressure and the elasticity of the spring to press the damping by pressing the outer peripheral surface of the bearing of the worm shaft, to efficiently absorb the flow and impact, improve the steering feeling by the hydraulic pressure It is an object of the present invention to provide a hydraulic clearance compensation device.

In addition, the present invention is filled with oil in the mounting portion of the seat assembled to the body, by operating the ball to take out the air contained in the oil to the outside, and then assembling the diaphragm and plug, the buffer effect of the oil by air residual It is an object of the present invention to provide a hydraulic play compensation device that can prevent the fall.

In order to achieve the above object, the hydraulic clearance compensation device of the present invention comprises: a body installed in a housing having a worm wheel and a worm shaft; A pressing member which is installed so as to be forward and backward in the installation portion of the body and forms a receiving portion in which oil is filled, and the contact protrusion is in contact with the bearing outer circumferential surface of the worm shaft; A sheet inserted into the receiving part to store oil in the first pressure chamber and forming a second pressure chamber in which another oil is received so as to be connected to the first pressure chamber through a through hole; A return spring installed in the first pressure chamber to provide an elastic force to the pressing member; A check member that blocks the through hole when the pressing member is retracted and opens the through hole when the pressing member is moved forward; And a gap portion provided between the inner diameter of the accommodation portion and the outer diameter of the sheet to move the oil in the first pressure chamber to the second pressure chamber.

The check member may include a check ball provided in the first pressure chamber to open and close the through hole; A relief spring providing an elastic force to the check ball; And a retainer supporting the relief spring and being pressed by the return spring in contact with the bottom of the seat in the first pressure chamber.

In addition, the retainer is formed in the form of a hat-shaped, characterized in that the circumference is provided with a plurality of incisions in the longitudinal direction to move the oil.

In addition, the retainer is characterized in that the end rim is assembled to the engaging groove which is formed recessed inside the bottom of the first pressure chamber.

In addition, the rear side of the body is provided with a diaphragm that contracts when the pressing member is retracted and expands when the pressing member is moved forward to compensate for the volume of oil moving in the first and second pressure chambers. It is done.

The diaphragm may further include a ring-shaped body part supported by a seating part formed around an inner circumference of the body; And a flexible membrane portion protruding in a film form from the edge of the body portion to the second pressure chamber side.

In addition, the rear side of the diaphragm is installed on the body is characterized in that a plug having a guide portion for guiding air movement during the diaphragm contraction and expansion is installed.

In addition, the plug is characterized in that it is assembled by hanging on the guide jaw portion having an inclined surface protruding on the inner edge of the body.

The diaphragm may be assembled by filling the second pressure chamber with oil, pressing the check ball through the through hole, and discharging air contained in the oil stored in the first pressure chamber to the outside through the through hole. Characterized in that.

In addition, an O-ring is installed between the body and the pressing member to prevent leakage of oil in the second pressure chamber.

In addition, the inner circumferential surface of the pressing member is formed with an inclined guide portion gradually narrowed as it enters to induce the movement of oil from the first pressure chamber to the gap portion, the sheet is formed from the second pressure chamber to the gap portion A plurality of discharge grooves for moving the oil is provided.

In addition, the body is characterized in that the restraining jaw portion is clamped to limit the front movement of the pressing member is formed.

Hydraulic play compensation device according to the present invention, by using the movement of the hydraulic pressure and the elasticity of the spring to pressurize and damp the outer peripheral surface of the bearing of the worm shaft, it is possible to efficiently absorb the flow and impact, improve the steering feeling by the hydraulic pressure. .

In addition, the present invention is filled with oil in the mounting portion of the seat assembled to the body, by operating the ball to take out the air contained in the oil to the outside, and then assembling the diaphragm and plug, the buffer effect of the oil by air residual The fall can be prevented.

1 is a configuration diagram showing a conventional electric power steering,
2 is a state diagram of the clearance compensation device installed in the conventional electric power steering reducer,
3 is a state diagram installed in the electric power steering reducer according to an embodiment of the present invention,
4 is an exploded front perspective view of a hydraulic play compensation device according to an embodiment of the present invention;
5 is an assembled perspective view of FIG. 4;
6 is an exploded perspective view, a rear exploded perspective view of a hydraulic play compensation device according to an embodiment of the present invention;
7 is an assembled cross-sectional view of a hydraulic play compensation device according to an embodiment of the present invention,
8 is a reverse state diagram of a hydraulic play compensation device according to an embodiment of the present invention,
9 is a view showing a state of advance of the hydraulic clearance compensation device according to an embodiment of the present invention.

Hereinafter, a hydraulic play compensation device according to an embodiment of the present invention will be described with reference to the accompanying drawings.

In this process, the thicknesses of the lines and the sizes of the components shown in the drawings may be exaggerated for clarity and convenience of explanation. In addition, terms to be described below are terms defined in consideration of functions in the present invention, which may vary according to the intention or convention of a user or an operator. Therefore, definitions of these terms should be made based on the contents throughout the specification.

3 is a state diagram installed in the electric power steering reducer according to an embodiment of the present invention, Figure 4 is a front exploded perspective view of a hydraulic play compensation device according to an embodiment of the present invention, Figure 5 is an assembled perspective view of FIG. 6 is an exploded perspective view and a rear exploded perspective view of a hydraulic play compensation device according to an embodiment of the present invention, Figure 7 is an assembled sectional view of the hydraulic play compensation device according to an embodiment of the present invention.

8 is a reverse state diagram of a hydraulic play compensation device according to an embodiment of the present invention, Figure 9 is a forward state view of a hydraulic play compensation device according to an embodiment of the present invention.

3 to 9, the hydraulic clearance compensation device according to an embodiment of the present invention, the body 10, the pressing member 20, the seat 30, the return spring 40, the check member 50 And the clearance part 60.

The body 10 is configured to form an external shape of the hydraulic play compensation device of the present invention, and is installed in a housing 7 having a worm wheel 5 and a worm shaft 4.

A thread is formed on the outer circumferential surface of the body 10 to be assembled by screwing into a screw groove of the housing.

The body 10 is configured to penetrate back and forth by the installation unit 12.

The pressing member 20 is installed on the mounting portion 12 of the body 10 so as to be movable forward and backward, and forms a receiving portion 24 filled with oil, and the outer peripheral surface of the bearing 6 of the worm shaft 4. The contact protrusions 22 are in contact with each other.

When the worm shaft 4 flows and the play occurs in the direction orthogonal to the worm shaft 4, the press protrusion 22 of the press member 20 presses in a state in which it is in contact with the side surface of the bearing 6. To compensate.

The body 10 is formed with a restraining jaw portion 16 to which the hexagonal or square clamps 95 are fastened so as to limit the front movement of the pressing member 20. The shape of the restrained jaw portion 16 may be variously changed.

When the clamp 95 is bent in a state where both ends are set at a predetermined interval to support the front side of the pressing member 20, the clamp 95 is inserted while being caught by the restrained jaw portion 16 of the body 10. It is to be assembled by engaging the corner portion to the restrained jaw portion (16). Therefore, the front departure of the pressing member 20 in the body 10 is prevented.

The seat 30 is inserted into the receiving part 24 to store oil in the first pressure chamber 32, and a second pressure in which other oil is received so as to be connected to the first pressure chamber 32 and the through hole 34. The seal 36 is formed.

The through hole 34 is a hole formed through the center of the partition 33 to move and block from the central portion of the seat 30 to the second pressure chamber 36, and the second hole 34 is second to the first pressure chamber 32. When the pressure of the pressure chamber 36 is high, it is the structure which guides the oil accommodated in the 2nd pressure chamber 36 to guide | induced to the 1st pressure chamber 32. FIG.

However. When the pressure of the first pressure chamber 32 is higher than that of the second pressure chamber 36, the oil contained in the first pressure chamber 32 is blocked by the through hole 34 by the check ball 52 described later. Therefore, it is led to the second pressure chamber 36 through the gap portion 60 rather than the through hole 34.

The first pressure chamber 32 is a variable space formed between the front groove of the seat 30 and the receiving portion 24 of the pressing member 20.

An O-ring 90 is installed between the body 10 and the pressing member 20 to prevent leakage of oil in the second pressure chamber 36.

When the pressing member 20 slides in the longitudinal direction in the mounting portion 12 of the body 10, the O-ring 90 pressurizes the oil contained in the second pressure chamber 36 to the inner diameter surface of the body 10. Moving to a gap between outer diameter surfaces of the member 20 to prevent leakage to the outside.

The return spring 40 is installed in the first pressure chamber 32 to provide an elastic force to the pressing member 20 so that the pressing member 20 moves in the direction of the outer circumferential surface of the bearing 6.

The return spring 40 is a coil spring having a smaller outer diameter than the inner diameter of the first pressure chamber 32.

The check member 50 blocks the through hole 34 when the pressing member 20 moves backward, and opens the through hole 34 when the pressing member 20 moves forward.

That is, the check member 50 blocks the through hole 34 when the pressure of the first pressure chamber 32 is higher than that of the second pressure chamber 36, and the second pressure is lower than that of the first pressure chamber 32. When the pressure of the seal 36 is high, the oil moves through the through hole 34 by opening the through hole 34.

The gap portion 60 is provided at a predetermined interval between the inner diameter of the accommodating portion 24 and the outer diameter of the seat 30 to move the oil in the first pressure chamber 32 to the second pressure chamber 36. In this case, the through hole 34 is blocked by the check member 50.

The check member 50 includes a check ball 52 provided in the first pressure chamber 32 to open and close the through hole 34, a relief spring 54 to provide elastic force to the check ball 52, and a relief. The retainer 56 supports the spring 54 and contacts the bottom of the seat 30 in the first pressure chamber 32 and is pressed by the return spring 40.

When the outer circumferential surface is precisely processed and the high pressure is applied to the first pressure chamber 32, the check ball 52 moves to the through hole 34 by the check ball 52 to closely adhere to the edge of the through hole 34. By blocking the gap, the oil in the first pressure chamber 32 is prevented from moving to the second pressure chamber 36 via the through hole 34.

Therefore, the oil stored in the first pressure chamber 32 gradually moves through the gap portion 60, so that the oil stored in the second pressure chamber 32, together with the elastic support force of the retinal spring 40, exerts a temporary resistance. By effectively blocking the play of the worm shaft 4, it is possible to minimize the occurrence of the rattle joint.

The retainer 56 is formed in the shape of a hat-shaped, and has a plurality of cutouts 57 through which the oil is moved by cutting in the longitudinal direction.

Although the cutouts 57 are illustrated in the form of three in one embodiment of the present invention, they may be increased or decreased as necessary.

The retainer 56 is assembled by engaging the end rim to the engaging groove 38 formed in the bottom inner side of the first pressure chamber 32.

The outer diameter of the end side edge of the retainer 56 may be larger than the inner diameter of the first pressure chamber 32 of the seat 30, which may be difficult to assemble, but the first pressure chamber 32 may be retracted when the cutout 57 is retracted. After being inserted into the) is restored and locked to the locking groove 38, the sheet 30 is assembled in a state where the separation is prevented.

The cutout 57 may be formed in various shapes.

An end side edge of the retainer 56 is formed with a curved seating groove 59 on which the return spring 40 is seated.

Since the return spring 40 is seated in the seating groove 59 of the retainer 56, the return spring 40 may stably push the pressure member 30 in a state where the flow of the return spring 40 is prevented.

The seating recess 59 is configured to have a curvature of a shape corresponding to the cross-sectional curvature of the return spring 40.

The rear side of the body 10 is contracted when the pressing member 20 is retracted to compensate for the volume of oil moving in the first and second pressure chambers 32 and 36 and when the pressing member 20 is moved forward. An expanding diaphragm 70 is provided.

The diaphragm 70 has a ring-shaped body portion 72 supported by a seating portion 18 formed around the inner circumference of the body 10, and the edge of the body portion 72 toward the second pressure chamber 36. The flexible film portion 74 protrudes in a film form.

The flexible membrane portion 74 is introduced into the second pressure chamber 36 when the oil stored in the first pressure chamber 32 flows into the second pressure chamber 36 through the gap 60 by the retraction of the pressing member 20, thereby increasing its volume. It is made of a flexible material that elastically shrinks without tearing well to compensate.

On the rear side of the diaphragm 70, a plug 80 is installed on the body 10 and has a guide portion 82 for guiding air movement during contraction and expansion of the diaphragm 70.

The guide portion 82 is a hole formed on the central portion of the plug 80.

The plug 80 is assembled by being caught by the guide jaw portion 14 protruding from the inner edge of the body 10.

On the entrance side of the guide jaw portion 14, the inclined surface portion 15 is inclined in the center direction to guide the entrance of the plug 80 is formed.

The diaphragm 70 fills the oil into the second pressure chamber 36, and then presses the check ball 52 through the through hole 34 to absorb air contained in the oil stored in the first pressure chamber 32. After discharging to the outside (upper side) through the through hole 34, it is preferable to assemble.

At this time, the air contained in the oil stored in the first pressure chamber 32 is filled with the oil in the receiving portion 24 of the pressing member 20, and then by inserting the seat 30, some oil flows slightly to the outside Oil is residually filled in the first pressure chamber 32, and a small amount of air is generated in the residually filled oil. If the residual air is not discharged, a sponge phenomenon in which air is compressed when oil is compressed is generated, so that the forward and backward operations of the pressing member 20 are not smooth. Therefore, the air is stored in the first pressure chamber 32. The air contained in the oil must be removed through the through hole (34) reliably.

After the diaphragm 70 is assembled, the diaphragm 70 is pressed from the body 10 by pressing the body portion 72 by coupling the plug 80 to the body 10 so as to prevent the diaphragm 70 from being separated. To prevent deviations.

An O-ring 90 is installed between the body 10 and the pressing member 20 to prevent leakage of oil in the second pressure chamber 32.

The o-ring 90 is assembled by being seated in the recessed groove 92 formed in the outer diameter of the pressing member 20.

The inner circumferential surface of the pressing member 20 is formed with an inclined guide portion 62 which is formed narrower gradually as it enters to induce oil movement from the first pressure chamber 32 to the gap portion 60.

The inclination induction part 62 may be formed to be inclined so that the gap gradually narrows as the gap part 60 goes around the seat 30.

The seat 30 is provided with a plurality of discharge grooves 37 for moving the oil from the second pressure chamber 36 to the space portion of the body 10.

Hereinafter, with reference to the accompanying drawings to look at the action and effect of the hydraulic clearance compensation device according to an embodiment of the present invention.

As shown in FIG. 8, when the pressing member 20 moves backward, the pressing member which is in contact with the bearing 6 of the worm shaft 4 during the operation of the worm wheel 5 and the worm shaft 4 ( When the back 20 is compressed to compress the return spring 40, the oil stored in the first pressure chamber 32 is compressed and the check ball 52 is pushed toward the through hole 34 along with the elastic force of the relief spring 54. Block it.

Therefore, the oil in the first pressure chamber 32 moves to the gap portion 60 through the inclined guide portion 62 by the reduced volume, and passes through the discharge groove 37 of the seat 30 to the second pressure chamber 36. Flows into.

At this time, the flexible membrane portion 74 of the diaphragm 70 is contracted by the amount by which the volume of the second pressure chamber 36 increases, thereby compensating for the volume. Subsequently, when the diaphragm 70 contracts, some air is discharged to the outside via the guide portion 82 of the plug 80.

Meanwhile, as shown in FIG. 9, when the pressing member 20 moves forward, the pressing contacted with the bearing 6 of the worm shaft 4 during the operation of the worm wheel 5 and the worm shaft 4 is performed. As the member 20 moves forward, the compressed return spring 40 expands while the first pressure chamber 32 expands to form a low pressure, thereby pulling the check ball 52 while elastically compressing the relief spring 54. The through hole 34 is opened.

Subsequently, the oil stored in the second pressure chamber 36 moves to the first pressure chamber 32 through the through hole 34 to reduce the volume of the second pressure chamber 36.

Therefore, the flexible membrane portion 72 of the contracted diaphragm 70 expands and returns, and air flows into the guide portion 82 of the plug 80 to compensate for the volume of the diaphragm 70.

While repeating this process, the pressing member 20 repeats the forward and backward movements, and compensates for the play of the worm shaft 4.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. I will understand.

Accordingly, the true scope of protection of the present invention should be defined by the following claims.

10 body 12 mounting part
14: guide jaw 16: restraint jaw
18: seating portion 20: pressing member
22: pressure protrusion 24: receiving portion
30 sheet 32 first pressure chamber
34: through hole 36: second pressure chamber
38: locking groove 40: return spring
50: check member 52: check ball
54: relief spring 56: retainer
57: incision 58: the border
60: clearance part 70: diaphragm
72: body portion 74: flexible film portion
80: plug 82: guide

Claims (12)

A body installed in a housing having a worm wheel and a worm shaft;
A pressing member which is installed so as to be forward and backward in the installation portion of the body and forms a receiving portion in which oil is filled, and the contact protrusion is in contact with the bearing outer circumferential surface of the worm shaft;
A sheet inserted into the receiving part to store oil in the first pressure chamber and forming a second pressure chamber in which another oil is received so as to be connected to the first pressure chamber through a through hole;
A return spring installed in the first pressure chamber to provide an elastic force to the pressing member;
A check member that blocks the through hole when the pressing member is retracted and opens the through hole when the pressing member is moved forward; And
A gap provided between the inner diameter of the pressing member and the outer diameter of the seat at a predetermined interval to move the oil in the first pressure chamber to the second pressure chamber;
Hydraulic play compensation device comprising a.
The method of claim 1,
The check member,
Check ball provided in the first pressure chamber to open and close the through hole
A relief spring providing an elastic force to the check ball; And
And a retainer supporting the relief spring and being pressed by the return spring in contact with the bottom of the seat in the first pressure chamber.
The method of claim 2,
The retainer is formed in the form of a hat-shaped, hydraulic circumference compensation device characterized in that it has a plurality of incisions are cut in the longitudinal direction to move the oil.
3. The method of claim 2,
The retainer is a hydraulic play compensation device, characterized in that the end rim is assembled to the engaging groove is formed in the bottom of the bottom of the first pressure chamber.
The method of claim 1,
The rear side of the body is provided with a diaphragm which is contracted when the pressing member is retracted and expanded when the pressing member is moved forward to compensate for the volume of oil moving in the first and second pressure chambers. Hydraulic playoff device.
6. The method of claim 5,
The diaphragm is,
A ring-shaped body part supported by a seating part formed around an inner circumference of the body; And
And a flexible membrane portion protruding in a film form from the edge of the body portion to the second pressure chamber side.
6. The method of claim 5,
A hydraulic clearance compensation device is installed at the rear side of the diaphragm, the plug having a guide part installed in the body and guiding air movement when the diaphragm contracts and expands.
8. The method of claim 7,
The plug is hydraulic clearance compensation device characterized in that the assembly is hooked to the guide jaw having an inclined surface protruding on the inner edge of the body.
The method of claim 2,
The diaphragm fills the second pressure chamber with oil, presses a check ball through the through hole, and discharges air contained in the oil stored in the first pressure chamber to the outside through the through hole. Hydraulic play compensation device characterized in that.
10. The method according to any one of claims 1 to 9,
Hydraulic clearance compensation device characterized in that the O-ring is installed between the body and the pressing member to prevent leakage of oil in the second pressure chamber.
10. The method according to any one of claims 1 to 9,
An inclined guide portion is formed on the inner circumferential surface of the pressing member gradually narrower as it enters to induce oil movement from the first pressure chamber to the gap portion.
And the seat is provided with a plurality of discharge grooves for moving oil from the second pressure chamber to the gap.
10. The method according to any one of claims 1 to 9,
The body has a hydraulic clearance compensation device characterized in that the restraining jaw portion is clamped to limit the front movement of the pressing member is formed.

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