JP2000334671A - Ball joint disassembly tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tool which can disassemble a ball joint used in an automobile, independent from a size of the ball joint and an attaching circumstance thereof with less loss in a force externally inputted. SOLUTION: In this disassembly tool, a slider 3 is fitted in a guide 2, a male thread part 4a of a thrust bolt 4 which is rotatable on an inner shaft 5 and which is limited in its vertical motion between a slipoff preventive tool 6 and a heat part is threadedly engaged with a female thread part 2a of the guide 2, and an assembly bolt 14 is inserted through slits 2b in the slider 3 and the guide 2 and a head part cross hole 5c in the inner shaft 5 so as to assembled the tool. With this arrangement, when the thrust bolt is screwed into, a press arm 8 for pressing a joint pin 21a, and a fork-like arm 9 held between a bearing ring part 30a and a ball joint 21 approach together while they are held in a parallel condition, in order to remove the ball joint 21 from a knuckle arm.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention mainly relates to the separation of a ball joint of a suspension arm when replacing a drive shaft boot, replacing a shock absorber, replacing a suspension spring, replacing a ball joint, etc. in a maintenance work of an automobile. The present invention relates to a tool used for separating a ball joint of a tie rod and the like.

[0002]

2. Description of the Related Art A steering system of an automobile has a structure in which a tie rod is moved right and left by a gear structure such as a rack and pinion mechanism by rotating a steering wheel, and the direction of a tire is changed through a knuckle arm connected by a tie rod end. General.

[0003] The ball joint of the tie rod end is required to move three-dimensionally. The ball joint is pressed into the bearing ring of the knuckle arm and screwed with a fixing nut to prevent it from coming off. In order to separate the ball joint from the inside of the bearing ring, separation tools shown in FIGS. 6, 7 and 8 have been developed and are already widely used.

The tool shown in FIG. 8 is generally employed as a special tool for an automobile manufacturer. A fork-shaped receiving member is inserted between a tie rod end and a bearing ring, and a press screw is inserted from above the joint pin. Tighten
It is pushed out by applying an external force directly to the joint pin, and is structurally simple and inexpensive. However, the type of vehicles that can be used is limited due to the disadvantage that a work space is required on the axis of the joint pin, and therefore, in a maintenance shop where a wide variety of vehicles are stocked, this alone can not cope and various sizes It is necessary to bring together the items having the structure shown in FIG.

The tool shown in FIG. 6 employs a boosting structure based on the principle of leverage, and has a fixed fulcrum position. This type has the disadvantage that the contact surface and angle between the press screw and the press lever constantly change as the press screw is screwed in, and therefore the force transmission efficiency changes. (As a matter of course, the transmission efficiency is good when the angle is a right angle.) Also, the size of the ball joint varies depending on the type and vehicle type, and there are many things that cannot be handled by this type of tool without an arm spacing adjustment structure .

FIG. 7 shows a solution to the problem of the tool shown in FIG. In the tool shown in FIG. 7, the distance between the press lever and the receiving member can be adjusted according to the size of the tie rod and the joint pin. By rotating the press lever with respect to the fulcrum bolt to adjust the relationship between the press lever and the holder in a parallel state, it is intended to relatively efficiently convert the thrust of the press screw to the pressing force of the joint pin. There is a disadvantage that the interval must be adjusted by rotating the press lever every time the object changes.

[0007]

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in view of the problems of the conventional ball joint separating tool, and has a small loss in input force, irrespective of the size of the ball joint and the joint pin, and a wider range of work. An object of the present invention is to provide a ball joint extraction tool that can perform an operation in accordance with an environment.

[0008]

According to a first aspect of the present invention, there is provided a cylindrical guide in which a female screw is screwed into an inner peripheral wall and a slit is provided in a longitudinal direction of a substantially middle portion so as to face the slit.
A fork-shaped arm or press arm fixed in a substantially L-shape to a cylindrical guide, a cylindrical slider in which the other arm is fixed in a substantially L-shape, and a male screw threaded to provide a polygonal portion at the upper end. A hollow thrust bolt, a shaft part with a diameter slightly smaller than the through hole provided on the axis of the thrust bolt, a head part having a larger diameter than the shaft part and a horizontal hole perpendicular to the axis, and a stopper at the other end. It consists of an inner shaft consisting of a tool engagement part, a stopper, and an assembly bolt.While keeping each arm part in a parallel state, a slider is inserted into the outer periphery of the guide, and the inner shaft is freely rotatable. The male screw of the thrust bolt, which restricts the vertical movement between the tool and the head, is screwed into the female screw of the guide, and the slit of the slider and guide and the head of the inner shaft are assembled using the assembly bolt. By inserting the hole and assembling, the thrust bolt is screwed in, the press arm that applies pressure to the joint pin of the ball joint pressed into the bearing ring, and the fork-shaped arm inserted between the bearing ring and the ball joint A ball joint extraction tool characterized in that the ball joint is extracted while maintaining a parallel state, thereby extracting the ball joint from the knuckle arm.

According to the second aspect of the present invention, the respective arms are made detachable, the mounting portions of the guide and the slider are made common, and the press arm and the fork-shaped arm are covered so as to be able to cope with even more severe working environments. 2. The separation tool for a ball joint according to claim 1, wherein the mounting portion has a shape corresponding to the shape of the mounting portion, whereby each arm can be replaced.

According to a third aspect of the present invention, there are provided two surfaces parallel to the width direction for connecting tools such as a monkey wrench and a spinner handle for receiving a reaction force when the thrust bolt is rotated, and a vertical opening. A ball joint separating tool characterized in that the formed square hole is provided at one end of a press arm or a fork-like arm.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a ball joint extraction tool according to the present invention will be described in detail based on an embodiment.

FIG. 4 is an exploded view of parts when a fork-shaped arm is mounted on the guide side and a press arm is mounted on the slider side, and the constituent parts will be described based on this.

The outer periphery of the cylindrical guide 2 is composed of a small-diameter portion 2f for slidably receiving the slider 3 and a large-diameter arm mounting portion 2c for mounting an arm.
a, and a small-diameter portion 2f is provided with an elongated slit 2b for restricting rotation of the slider 3 so as to face the small-diameter portion 2f. Further, a cap 12 having an outer diameter larger than the large-diameter arm mounting portion 2c can be fixed to the lower end of the guide 2 by using a screw 13 as a stopper (pressure receiver) when a load is applied to the arm.

The slider 3 has an arm mounting portion 3c of the same shape as the large-diameter arm mounting portion 2c of the guide 2 below the outer periphery, and a flange portion 3b at the middle portion which comes into contact with the arm and receives upward pressure. The inner peripheral wall is hollow with a diameter slightly larger than the guide small diameter portion 2f so as to be slidable on the guide 2, and a step portion 3a for receiving the bearing unit 11 is provided in the upper opening.

The thrust bolt 4 is provided with a female screw 2 on the inner peripheral wall of the guide.
A bolt having a hexagonal head having a male screw 4a corresponding to a, and a through hole 4c is provided on the axis. The inner shaft 5 is slightly smaller in diameter than the through hole 4c and has a thrust bolt 4
A shaft portion 5a slightly longer than the entire length of the head portion, a head portion 5b having a larger diameter and a transverse hole 5c provided in a direction orthogonal to the axial direction at one end, and a retaining member locking portion 5d at the other end. It is provided in. The thrust bolt 4 inserted on the inner shaft 5 is
Between the head portion 5b and the stopper 6 so as to be rotatable.

The bearing unit 11 includes a thrust bolt 4
It is intended to reduce the rotational resistance of the ball joint, and functions as a ball joint separating tool even if it is not particularly configured. However, it is preferable to incorporate the tool into the configuration for more comfortable work.

The press arm 8 is provided with a circular hole 8a at one end for receiving a slider or guide arm mounting portion, and has a flat surface 8b parallel to the fork-shaped arm 9, and a joint is provided at a position opposed to the joint pin 21a on this surface. A recess 8c is provided to prevent the pin from shifting and coming off. (See Fig. 2)

The fork-shaped arm 9 is provided with a circular hole 9a at a substantially central portion for receiving a guide or arm mounting portion.
At one end, the thickness is gradually reduced toward the tip to make it easier to insert between the ball joint and the bearing ring, and a forked bifurcated shape is used to increase the contact area with the bearing ring as much as possible. And At the other end of the press arm 8 or the fork-shaped arm 9, a reaction force receiver 10 is provided to prevent the separation tool itself from rotating when the thrust bolt 4 rotates when the ball joint is pushed out. The reaction force receiver 10 is provided with two surfaces 10a parallel to the width direction for connecting a monkey wrench or the like, and is provided with a square hole 10b for connecting a spinner handle or the like, which is vertically opened.

The relationship between the components of the tool having the above-described main configuration will be described with reference to the drawings.

First, the slider 3 is fitted into the guide 2, and the bearing unit 11 is assembled to the step 3a of the slider 3. Next, a thrust unit including the inner shaft 5 and the thrust bolt 4 and the stopper 6 attached to the inner shaft is assembled by screwing the male screw 4a of the thrust bolt into the female screw 2a of the guide. Arm mounting part 3c of slider 3
One arm 8 (9) is fitted from the guide side. Next, after adjusting the mounting holes 8d (9d) of the arm, the mounting holes 3d of the slider, the slits 2b and 2b provided to face the guide, and the horizontal hole 5c of the head portion of the inner shaft in a straight line, the assembling bolt is formed. 14a is inserted and positioning is performed. Slit 2b width, slider arm mounting hole 3d
And the diameter of the lateral hole 5c of the inner shaft head and the diameter of one of the mounting holes 8d (9d) of the arm are set slightly larger than the shaft diameter of the mounting bolt. A female screw 8e (9e) corresponding to the mounting bolt is screwed into the other mounting hole 8d '(9d') of the arm, and the positional relationship is determined by screwing the mounting bolt 14a into this. I do. Next, the other arm 9 (8) is fixed to the guide large-diameter arm mounting portion 2c using the assembling bolts 14b so that the arms are parallel to each other, and a cap is provided to prevent removal (reaction force receiving). 12 is fixed to the lower end of the guide 2 using the screw 13, and the assembling is completed.

The slider 3, one of the arms 8 (9) and the inner shaft 5 are connected to the mounting bolt 1 as shown in FIG.
4, the thrust bolts 4 are positioned in a non-rotatable manner on the inner shaft 5, and the bearing unit 11 rotates between the lower surface of the hexagonal head of the thrust bolt 4 and the step 3 a of the slider. It is arranged freely.

FIG. 1 shows a tool in which a press arm 8 is attached to a guide 2 and a fork-shaped arm 9 is attached to a slider 3 by using a ball joint 21 of a tie rod end 20 and a bearing ring 30 a of a knuckle arm 30, which are work objects. FIG. 10 is a view showing a state where the arms 8 and 9 are combined in a state where the ball joint 21 is press-fitted from below into the bearing ring portion 30a.

Next, the movement of the tool will be described with reference to FIGS.

When the thrust bolt 4 is rotated and screwed into the guide 2, the guide 2 descends relative to the thrust bolt 4. (The bearing ring and the fork-like arm are stationary and serve as references.) At this time, the slider 3 and the fork-like arm 9 and the inner shaft 5 attached to the slider are assembled.
Is rotatable with respect to the thrust bolt 4 and its movement in the vertical direction is restricted, and therefore does not move with the rotation of the thrust bolt 4. FIG. 2 shows that the thrust bolt 4 is rotated from the state shown in FIG.
To the joint pin 2 of the ball joint 21
FIG. 4 is a diagram showing a state in which pressure is applied to 1a and a ball joint 21 is pushed out from a bearing ring portion 30a of a knuckle arm 30. FIG. 5 is a diagram showing a state in which the fork-shaped arm 9 is mounted on the guide side and the press arm 8 is mounted on the slider side for an object in a state where the ball joint 21 is press-fitted from above into the bearing ring 30a. It is.

The press arm 8 and the fork-shaped arm 9
It may be integrally formed or fixed to the guide 2 or the slider 3. However, in order to flexibly cope with the mounting condition of the ball joint 21 and the spatial environment of the work site, each is separately provided and the shape of the connection portion is formed. It is preferable to make them interchangeable.

The above is literally an example, and it goes without saying that the present invention can be implemented in various modified forms based on common knowledge of those skilled in the art.

[0027]

According to the first aspect of the present invention, the distance between the arms 8 and 9 can be moved in parallel with the above-described structure.
Can be pressed perpendicularly to the axial direction thereof, and the extraction work can be performed without generating output loss and transmission loss with respect to an input from the outside that occurred with the tool shown in FIG. Also, since the same thrust bolt 4 can be used to adjust the distance between the arms 8 and 9 and input the punching work, the distance between the arms is adjusted in advance according to the size of the ball joint or the like as in the tool shown in FIG. You no longer need to. In addition, the width of the tool can be reduced by using a single shaft. In the tool shown in FIG. 8, a space for inserting the separation tool into the axis of the joint pin 21a and a work space for turning the press screw 40 are required. However, the press arm 8 and the fork-shaped arm 9 are provided for the guide 2 and the slider 3, respectively. The tool is arranged and the thrust bolt 4 is rotated by inputting to the thrust bolt 4 and offsetting the press arm 8 and the fork-shaped arm 9 in a uniaxial manner. If the gap to be made is on any side of the ball joint, the ball joint can be generally separated.

In the second invention, the press arm and the fork-shaped arm are further provided separately from the guide and the slider.
By making the shape of each mounting part common, each arm can be rearranged, and it can be adapted to various working environments.

According to the third aspect of the present invention, the fork-shaped arm or the press arm is provided at one end thereof with two surfaces parallel to the lateral width direction and a square hole opened in the vertical direction. It is possible to stably hold the tool set in a stable state, and to prevent the tool from rotating around the ball joint when a rotational force is applied to the thrust bolt.

[0030]

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view showing a state where the tool is assembled to separate a ball joint press-fitted from below into a bearing ring portion of a knuckle arm.

FIG. 2 is a sectional view showing a state in which a ball joint is separated by rotating a thrust bolt from the state of FIG. 1;

FIG. 3 is a sectional view (excluding a part) of the tool shown in FIG. 1 taken along the line AA.

FIG. 4 is an exploded view of parts of the tool.

FIG. 5 is a partial cross-sectional view showing a state where the tool is assembled to separate a ball joint press-fitted from above into a bearing ring portion of a knuckle arm.

FIG. 6 is a perspective view of a conventional ball joint pusher using the principle of leverage.

FIG. 7 is an improved version of the tool of FIG. 6, and is a partial cross-sectional view of a conventional ball joint punching tool of a type capable of adjusting the interval between arms.

FIG. 8 is a perspective view of a ball joint punching tool of a type that directly pushes out a joint pin, which is mainly used as an exclusive service tool by an automobile manufacturer.

[Explanation of symbols]

 Reference Signs List 1 ball joint separation tool 2 guide 2a female screw 2b slit 2c arm mounting portion 2d mounting hole 2f small diameter portion 3 slider 3a stepped portion 3b flange portion 3c arm mounting portion 3d mounting hole 4 thrust bolt 4a male screw 4b polygonal portion 4c through hole 5 inner shaft 5a shaft portion 5b head portion 5c lateral hole 5d retaining device locking portion 6 retaining device 8 press arm 8a circular hole 8b flat surface 8c concave portion 8d mounting hole 8e female screw 9 fork arm 9a circular hole 9d mounting hole 9e female screw 10 reaction force Receiver 10a Parallel two faces 10b Square hole 11 Bearing unit 12 Cap 13 Screw 14 Assembling bolt 20 Tie rod end 21 Ball joint 21a Joint pin 30 Knuckle arm 30a Bearing ring 40 Press screw 80 Press lever 90F Over click-like receptacle

Claims (3)

[Claims] 1. A cylindrical guide provided with a female screw threaded on an inner peripheral wall thereof and provided with slits opposed in a longitudinal direction of a substantially middle portion, and a fork-shaped arm or a press arm fixed to the cylindrical guide in a substantially L-shape. And a cylindrical slider having the other arm fixed in a substantially L-shape, a hollow thrust bolt having an external thread and a polygonal portion provided at one end, and a shaft having a diameter slightly smaller than a through hole of the thrust bolt. An inner shaft comprising a head portion having a larger diameter than the portion and the shaft portion and having a lateral hole in a direction perpendicular to the axis, and a stopper engaging portion at the other end,
It consists of a stopper and an assembly bolt, and inserts the slider into the guide while keeping the respective arms parallel to each other, and turns freely on the inner shaft and vertically between the stopper and the head. By screwing the male screw of the thrust bolt with restricted movement into the female screw of the guide, inserting the slider into the slit of the guide and the side hole of the head of the inner shaft using the assembly bolt and assembling, the screwing of the thrust bolt, The press arm that applies pressure to the joint pin of the ball joint press-fitted into the bearing ring, and the fork-shaped arm inserted between the bearing ring and the ball joint are brought close to each other while keeping the parallel state, and the ball joint is extracted. Characterized ball joint separation tool. 2. The separation tool for a ball joint according to claim 1, wherein each of the arms is detachable, and the press arm and the fork-shaped arm have a common mounting portion shape so that the arms can be exchanged. . 3. A horizontal plane for connecting a tool as a reaction force receiver when the thrust bolt is rotated. Two planes parallel to the vertical direction are provided, and a square hole opened in the vertical direction is provided at one end of the press arm or the fork-like arm. The ball joint separating tool according to claim 2, wherein: