Lower arm removal tool and lower arm removal tool set

Abstract

To provide a lower arm removal tool and a lower arm removal tool set capable of removing a lower arm with a simple operation without damaging peripheral parts. [Solution] The device comprises a base having an installation surface, and a first hanging portion and a second hanging portion which are installed at a distance from each other on the installation surface and extend along the normal direction to the installation surface. The base has an attachment portion for removably attaching a rotating tool that rotates the base, and the rotating tool is rotatable around a central axis extending in the normal direction at the attachment portion. By bringing the installation surface into contact with the side of the lower arm, and rotating the rotating tool attached to the attachment portion from a hanging state in which the first hanging portion is hung on the upper surface of the lower arm and the second hanging portion is hung on the lower surface of the lower arm, the base is rotated around the central axis, and a force is applied to the lower arm in a direction to remove it from the attachment object.

Description

[Technical field]

[0001] The present invention relates to a lower arm removal tool and a lower arm removal tool set used for removing a lower arm from a vehicle. [Background technology]

[0002] In a suspension device for a vehicle, for example, disclosed in Patent Document 1, a lower end of a knuckle member that rotatably supports a wheel is connected to a vehicle body via a lower arm. The knuckle member has an insertion hole through which a drive shaft is inserted. The lower arm is made of two link members, one in front and one in back, and the front link member extends almost linearly along the vehicle width direction, one end of which is pivotally attached to the lower end of the knuckle member via a ball joint, and the other end of which is connected to a cross member via a rubber bush whose axis extends in the vehicle front-rear direction so as to be able to swing up and down. The pivotal attachment is performed by inserting a joint bolt extending from the ball joint into the knuckle member and screwing a joint nut to the tip side of the joint bolt extending from the knuckle member. Lower arms are used not only in suspension devices but also in steering devices and the like. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2001-63330 A Summary of the Invention [Problem to be solved by the invention]

[0004] It may be necessary to remove the lower arm for the purpose of replacing, inspecting, maintaining, or otherwise replacing the lower arm, ball joint, joint boot that covers the ball joint, knuckle, etc. Conventionally, the removal of the lower arm has been performed using a tool such as a tie rod end puller, a ball joint knock remover, or a joint puller.

[0005] However, since the tie rod end puller, ball joint knock remover, or joint puller is not originally designed for removing the lower arm, it is not suitable for removing the lower arm in which the knuckle member, wheel cover, suspension, and other members are arranged in close proximity. In other words, in the work using the conventional tools, a space for the working range of the tool and a space for the hand of the worker holding the tool are required around the lower arm, and in the work of removing the lower arm in such a limited space, it is difficult to perform the work efficiently, and there is a risk of unintentionally damaging the surrounding members by performing the work unreasonably. In response to this, it is possible to secure the work space by removing the surrounding components in advance, but this is not preferable from the viewpoint of reducing the work efficiency because it further increases the work time.

[0006] Therefore, an object of the present invention is to provide a lower arm removal tool and a lower arm removal tool set that are suitable for the removal of a lower arm when there is not enough working space around it, and that can remove the lower arm with simple operations without damaging surrounding parts. [Means for solving the problem]

[0007] In order to solve the above problems, the lower arm removal tool of the present invention is a lower arm removal tool for removing a lower arm attached to an attachment object, comprising a base having an installation surface, and a first hanging portion and a second hanging portion which are installed at a distance from each other on the installation surface and extend along a normal direction to the installation surface, the base has an attachment portion for removably attaching a rotating tool that rotates the base, the rotating tool being rotatable around a central axis extending in the normal direction at the attachment portion, and the installation surface is brought into contact with a side of the lower arm, and the first hanging portion arranged on the attachment object side is hung on the upper surface of the lower arm, and the second hanging portion arranged farther from the attachment object than the first hanging portion is hung on the underside of the lower arm, and by rotating the rotating tool attached to the attachment portion from this hung state, the base is rotated about the central axis, thereby applying a force to the lower arm in a direction to remove it from the attachment object.

[0008] In the lower arm removal tool of the present invention, the first hooking portion and the second hooking portion are preferably arranged along the first direction on the installation surface.

[0009] In the lower arm removal tool of the present invention, the installation surface preferably extends along the first direction.

[0010] In the lower arm removal tool of the present invention, it is preferable that the base portion has an arm portion extending in a second direction that is different from the first direction in the planar direction of the installation surface, and the attachment portion is provided at the tip of the arm portion.

[0011] In the lower arm removal tool of the present invention, it is preferable that the arm portion extends below the lower arm in the hooked state and is operated in a range below the lower arm.

[0012] In the lower arm removal tool of the present invention, the second direction is preferably a direction perpendicular to the first direction, or a direction inclined toward the first hook portion.

[0013] In the lower arm removal tool of the present invention, the first hooking portion and the second hooking portion are preferably rod-shaped members extending along the normal direction.

[0014] In the lower arm removal tool of the present invention, the distance between the first hooking portion and the second hooking portion in the first direction is preferably greater than the distance between the upper and lower surfaces of the lower arm.

[0015] In the lower arm removal tool of the present invention, the base portion, the first hook portion and the second hook portion are preferably formed from chromium molybdenum steel, carbon steel or manganese molybdenum steel.

[0016] The lower arm removal tool set of the present invention is a lower arm removal tool set for rotating a lower arm attached to an attachment object to remove it from the attachment object, and comprises a base having an installation surface, a first hanging portion and a second hanging portion which are installed at a distance from each other on the installation surface and extend along a normal direction to the installation surface, and a rod-shaped rotating tool which rotates the base, and the base has an attachment portion for removably attaching the rotating tool, and the rotating tool is rotatable around a central axis extending in the normal direction at the attachment portion, and is characterized in that by bringing the installation surface into contact with the lower arm, and hanging the first hanging portion arranged on the attachment object side on the upper surface of the lower arm and hanging the second hanging portion arranged farther from the attachment object than the first hanging portion on the lower surface of the lower arm, the rotating tool attached to the attachment portion is rotated downward to rotate the base about the central axis, thereby applying a force to the lower arm in a direction to remove it from the attachment object. Effect of the Invention

[0017] The lower arm removal tool and lower arm removal tool set of the present invention are suitable for removing a lower arm when there is not enough working space around it, and allow the lower arm to be removed with simple operations without damaging surrounding parts. [Brief description of the drawings]

[0018] [Figure 1] FIG. 1 is a perspective view showing a configuration of a lower arm removal tool according to a first embodiment of the present invention. [Diagram 2] FIG. 2 is a perspective view showing the relationship between a lower arm and an object to which the lower arm is attached in the first embodiment of the present invention. [Diagram 3] 1 is a plan view showing a state in which a lower arm removal tool according to a first embodiment of the present invention is placed on a lower arm attached to an attachment target. FIG. [Figure 4] 1 is a side view showing a state in which a lower arm removal tool according to a first embodiment of the present invention is placed on a lower arm attached to an attachment target. FIG. [Diagram 5] 1 is a perspective view showing a state in which a lower arm removal tool according to a first embodiment of the present invention is placed on a lower arm attached to an attachment target. FIG. [Figure 6] FIG. 11 is a perspective view showing the configuration of a lower arm removal tool according to a second embodiment of the present invention. [Figure 7] FIG. 11 is a plan view showing a state in which a lower arm removal tool according to a second embodiment of the present invention is placed on a lower arm attached to an attachment target. [Figure 8] FIG. 11 is a perspective view showing a state in which a lower arm removal tool according to a second embodiment of the present invention is placed on a lower arm attached to an attachment target. [Figure 9] FIG. 11 is a perspective view showing the configuration of a lower arm removal tool according to a modified example of the second embodiment of the present invention. [Figure 10] FIG. 13 is a plan view showing the configuration of a lower arm removal tool according to a further modified example of the second embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A lower arm removal tool and a lower arm removal tool set according to an embodiment of the present invention will be described in detail below with reference to the drawings. First Embodiment Fig. 1 is a perspective view showing the configuration of a lower arm removal tool 10 according to the first embodiment. As shown in Fig. 1, the lower arm removal tool 10 according to the first embodiment includes a base 11, a first hooking portion 12, and a second hooking portion 13. A lower arm removal tool set is formed by the lower arm removal tool 10 and a spinner 15 as a rotating tool shown in Figs. 3 to 5.

[0020] The base 11 has a generally diamond-shaped plate shape, with a flat installation surface 11a extending along a first direction D1, which is the direction of the longer diagonal of the diamond. A mounting hole 14 is provided as a mounting portion at the center of the installation surface 11a in the first direction D1, penetrating the base 11 in the thickness direction, i.e., in the normal direction Dn of the installation surface 11a. A first hanging portion 12 and a second hanging portion 13 are provided at symmetrical positions with respect to the mounting hole 14, i.e., with respect to the center of the installation surface 11a, and are spaced apart from each other.

[0021] The first hanging portion 12 and the second hanging portion 13 are cylindrical members extending along the normal direction Dn of the installation surface 11a, and have the same shape.

[0022] The first hanging portion 12 is provided with four grooves 12g recessed in the circumferential direction at equal intervals along its axial direction, i.e., along the normal direction Dn, and the second hanging portion 13 is also provided with four grooves 13g recessed in the circumferential direction at equal intervals along its axial direction. The four grooves 12g of the first hanging portion 12 and the four grooves 13g of the second hanging portion 13 are provided in the same shape at positions corresponding to each other in the normal direction Dn. With this configuration, when the first hanging portion 12 and the second hanging portion 13 are hooked onto the lower arm 20, the grooves 12g, 13g are prevented from slipping and are reliably engaged with the lower arm 20, increasing the hooking force.

[0023] The base 11, the first hanging portion 12 and the second hanging portion 13 are preferably made of a material that has hardness and strength such that the torque generated in the lower arm removal tool 10 based on the rotation of the spinner 15 during the removal process of the lower arm 20 is reliably transmitted to the lower arm 20 and that does not damage the lower arm 20; for example, chromium molybdenum steel, carbon steel or manganese molybdenum steel is used and formed by forging or the like.

[0024] The rotating tool is not limited to spinner 15, but for example, a ratchet wrench or a socket wrench can be used. Base 11 is provided with a mounting hole or mounting protrusion shaped to correspond to the mounting portion of the rotating tool as a mounting portion. Base 11 shown in FIG. 1 is provided with mounting hole 14 having a diamond-shaped cross section into which mounting portion 15a of spinner 15 can be mounted.

[0025] Next, the process of removing the lower arm 20 will be described with reference to FIGS. 2(a) and (b) are perspective views showing the relationship between the lower arm 20 and the knuckle 30 to which it is to be attached, where (a) shows the state before the start of the removal process and (b) shows the state after the removal process is completed. Each of Figs. 3 to 5 shows the state in which the lower arm removal tool 10 is placed on the lower arm 20 attached to the knuckle 30.

[0026] In the first embodiment, as an example, a process for removing a lower arm when it is attached to a general suspension device will be described, but the removal process can be performed in a similar manner for a lower arm attached to another device, such as a steering device.

[0027] As shown in Fig. 2(a), the lower arm 20 is connected to a knuckle 30 on the vehicle side, which is an attachment target, via a ball joint 21 attached to the tip of the lower arm 20. As shown in Fig. 2(b), a joint bolt 22 extends from the ball joint 21 and is pivotally attached to the knuckle 30, i.e., rotatably inserted therein. A joint nut 23 is screwed onto the tip of the joint bolt 22, whereby the lower arm 20 is fixed to the knuckle 30.

[0028] The process of removing the lower arm 20 is performed with the joint nut 23 loosened by a predetermined amount, i.e., even when the removal process makes it possible for the lower arm 20 to be detached from the knuckle 30, the joint nut 23 threaded onto the tip of the joint bolt 22 can prevent it from coming off. In addition, in cases where the lower arm 20 is allowed to fall after removal, the process of removing the lower arm 20 may be started with the joint nut 23 removed from the joint bolt 22.

[0029] When removing the lower arm 20, first, the attachment portion 15a at the tip of the spinner 15 as a rotating tool is attached to the attachment hole 14 from the back surface 11b of the base portion 11.

[0030] 3 to 5, the installation surface 11a of the base 11 is brought into contact with the left side surface 20c of the lower arm 20, the outer circumferential surface of the first hanging portion 12 is brought into contact with the upper surface 20a of the lower arm 20, and the outer circumferential surface of the second hanging portion 13 is brought into contact with the lower surface 20b of the lower arm 20. This results in a hanging state in which the first hanging portion 12 and the second hanging portion 13 are hung from above and below the lower arm 20. The spinner 15 may be attached to the base 11 after the first hook portion 12 and the second hook portion 13 are hooked.

[0031] As shown in Figures 4 and 5, by rotating handle portion 15b of spinner 15 around central axis 14x (see Figure 1) of mounting hole 14, base portion 11 integrated with spinner 15 can be rotated around central axis 14x.

[0032] As shown in Fig. 4, when the spinner 15 is rotated downward in a counterclockwise direction (R1 direction in Fig. 4) in the above-mentioned hooked state, a force is applied to rotate the base 11 in a counterclockwise direction (R2 direction in Fig. 4), whereby the ball joint 21 side of the lower arm 20 is urged downward by the first hook portion 12, and the side of the lower arm 20 farther from the ball joint 21 is urged upward by the second hook portion 13. By transmitting the rotational force of the spinner 15 to the lower arm 20 in this manner, a force in a counterclockwise direction (R3 direction in Fig. 4) is applied to the ball joint 21 and the joint bolt 22, i.e., a force in a direction to remove the lower arm 20 from the knuckle 30, so that the joint bolt 22 pivotally attached to the knuckle 30 is displaced downward, and the lower arm 20 can be separated from the knuckle 30 by removing the joint nut 23 from the joint bolt 22.

[0033] After the above operations are completed, the joint nut 23 is removed, and the lower arm 20 can be moved downward and removed from the knuckle 30, as shown in FIG. 2(b).

[0034] As configured as above, the above embodiment provides the following advantages. (1) The removal operation can be performed by hooking the first hanging portion 12 and the second hanging portion 13 onto the upper surface 20a and the lower surface 20b of the lower arm 20, respectively. Therefore, even if there is no space around the lower arm 20 or around the knuckle 30, the removal operation can be easily performed without damaging surrounding structures, etc. (2) Since there is only a space below the lower arm 20 in which the spinner 15 can be operated, the removal work can be performed without affecting the structures above the lower arm 20 and the knuckle 30. (3) When the work is performed with the joint nut 23 attached, the removal work can be performed in a state where the lower arm 20 is prevented from falling. (4) Since the mounting hole 14 is a rectangular hole penetrating the base 11 in the thickness direction, the lower arm 20 can be removed by mounting a general rotating tool such as the spinner 15.

[0035] In the first embodiment, the distance between the first hanging portion 12 and the second hanging portion 13 in the first direction D1 is set arbitrarily depending on the shape of the lower arm 20 and the setting of the rotational force applied to the lower arm 20, but in order to ensure rotation, it is desirable for the distance to be greater than the distance between the upper surface 20a and the lower surface 20b of the lower arm 20 to which it is hung.

[0036] The first hanging portion 12 and the second hanging portion 13 are not limited to cylindrical members as long as they are rod-shaped members extending along the normal direction Dn of the installation surface 11a, and may be members having a polygonal cross section perpendicular to the axis, for example. Furthermore, the first hanging portion 12 and the second hanging portion 13 may be in a shape other than a rod shape, for example a protrusion shape, so long as they can be hung on the upper surface 20a and the lower surface 20b of the lower arm 20, respectively. Furthermore, it is preferable to provide a locking portion folded back toward the corresponding hanging portion at the tip of at least one of the first hanging portion 12 and the second hanging portion 13, because this stabilizes the posture of the lower arm removal tool 10 relative to the lower arm 20 during removal work.

[0037] The base 11 is shaped like a generally diamond-shaped plate, but is not limited to this shape as long as it can be brought into surface contact with the left side surface 20c when the lower arm 20 is removed. For example, it can be shaped like a long plate or a block.

[0038] The first hanging portion 12 and the second hanging portion 13 are each provided with four grooves 12g, 13g, but the number can be set arbitrarily depending on the shape of the lower arm 20 and the overall weight of the lower arm removal tool 10. It is preferable that the grooves 12g, 13g are provided at least in the range where the first hanging portion 12 and the second hanging portion 13 contact the lower arm 20.

[0039] Instead of or in addition to the grooves 12g, 13g, the surfaces of the first hanging part 12 and the second hanging part 13 may be provided with fine irregularities to enhance the anti-slip effect.

[0040] In the above embodiment, the installation surface 111a is a flat surface, but as long as it can be brought into contact with the side surface of the lower arm 20, it may include an uneven surface or a curved surface.

[0041] <Second embodiment> Fig. 6 is a perspective view showing the configuration of a lower arm removal tool 110 according to the second embodiment. Fig. 7 and Fig. 8 each show a state in which the lower arm removal tool 110 is placed on the lower arm 20 attached to the knuckle 30 as an attachment target.

[0042] 6, the lower arm removal tool 110 includes a base 111 and an arm 116. A flat installation surface 111a extends along a first direction D11, which is the longitudinal direction, of the base 111. A first hook portion 112 and a second hook portion 113, similar to those in the first embodiment, are provided on the installation surface 111a at symmetrical positions with respect to the center of the surface in the first direction D11 and spaced apart from each other.

[0043] As in the first embodiment, the first hanging portion 112 and the second hanging portion 113 are provided with four grooves 112g, 113g recessed in the circumferential direction at equal intervals along the axial direction, i.e., along the normal direction Dn. The four grooves 112g of the first hanging portion 112 and the four grooves 113g of the second hanging portion 113 are provided in the same shape at corresponding positions in the normal direction Dn, so that when the first hanging portion 112 and the second hanging portion 113 are hung on the lower arm 20, the grooves 112g, 113g are prevented from slipping and are reliably engaged with the lower arm 20, thereby increasing the hanging force.

[0044] The arm 116 extends in a long plate shape along the second direction D12 from the end of the base 111 on the second hanging part 113 side. The second direction D12 is different from the first direction D11 in which the installation surface 111a extends in the planar direction of the installation surface 111a, i.e., in the in-plane direction including the installation surface 111a, and extends downward from the installation surface 111a. More specifically, as shown in FIG. 6, assuming that the installation surface 111a is arranged along the vertical direction and the first direction D11 is arranged along the horizontal direction, the arm 116 extends downward from the second hanging part 113 side and linearly extends toward the first hanging part 112 side in the first direction D1 toward the tip.

[0045] At the lower end of arm 116, a first mounting hole 114 having a rectangular cross section perpendicular to the thickness direction and a diamond-shaped second mounting hole 115 are formed as mounting portions that penetrate through arm 116 in the thickness direction. First mounting hole 114 and second mounting hole 115 penetrate arm 116 along its thickness direction, in other words along normal direction Dn, and have central axes 114x and 115x, respectively.

[0046] 7 and 8, the removal operation of the lower arm 20 is performed by bringing the installation surface 111a of the base 111 into contact with the left side surface 20c of the lower arm 20, bringing the outer circumferential surface of the first hanging portion 112 into contact with the upper surface 20a of the lower arm 20, and bringing the outer circumferential surface of the second hanging portion 113 into contact with the lower surface 20b of the lower arm 20. This is the same as in the first embodiment, and the first hanging portion 112 and the second hanging portion 113 are in a hanging state in which they are hung from above and below the lower arm 20.

[0047] Mounting portion 15a at the tip of spinner 15 is inserted into second mounting hole 115 of arm portion 116 from surface 116a, and by rotating handle portion 15b of spinner 15 around central axis 115x of second mounting hole 115, base portion 111 integrated with spinner 15 can be rotated around central axis 115x.

[0048] More specifically, as shown in FIG. 8, when the spinner 15 is rotated downward and, in the state shown in FIG. 8, rotated counterclockwise (in the direction of R11 in FIG. 8), a force is generated to rotate the base 111 counterclockwise (in the direction of R12 in FIG. 8), as in the first embodiment, and as a result, the ball joint 21 side of the lower arm 20 is urged downward by the first hanging portion 112 and the side of the lower arm 20 away from the ball joint 21 is urged upward by the second hanging portion 113, so that a downward force in the counterclockwise direction (in the direction of R13 in FIG. 8) is applied to the ball joint 21 and the joint bolt 22, and the joint bolt 22 pivotally attached to the knuckle 30 is displaced downward.

[0049] In the lower arm removal tool 110 of the second embodiment, the spinner 15 is attached from the surface 116a of the arm 116, so that the removal work can be performed with the handle portion 15b of the spinner 15 extending on the straight line along which the lower arm 20 extends, as shown in FIG. 7. Therefore, when the spinner 15 is rotated, it is easy to maintain the state in which the lower arm 20 is located within a plane including the rotation direction. Therefore, the state in which the installation surface 111a is in contact with the lower arm 20 is maintained, and the force due to the rotation of the spinner 15 does not cause twisting or the like in the lower arm 20, and the rotation force in the R11 direction shown in FIG. 8 is stably transmitted, so that the lower arm 20 can be rotated efficiently. In addition, by providing the arm 116, the distance between the first hook portion 112 and the second hook portion 113 and the mounting hole 115 can be made longer, so that a larger force can be applied to the lower arm 20, which is particularly useful when removing a large lower arm 20 or when the mounting strength is high.

[0050] Here, the shape of the arm 116 is not limited to that shown in FIG. 6, so long as it extends downward. For example, the angle between the second direction D12 in which the arm 116 extends and the first direction D11 in which the installation surface 111a extends, and the length over which the arm 116 extends can be set arbitrarily according to the configuration of the lower arm 20 and its surroundings. For example, the angle between the first direction D11 and the second direction D12 may be 90 degrees. The starting point of the arm 116 can also be set at any position, not limited to the second hanging portion 13 side. Furthermore, making the arm 116 longer is preferable because it makes it less likely that the lower arm 20 will twist when the spinner 15 is rotated.

[0051] When there is a space around the lower arm 20 allowing the arm 116 to rotate, the arm 116 may extend above the installation surface 111a.

[0052] Furthermore, the number of mounting holes provided in arm portion 116 may be one, or three or more, and the cross-sectional shape and size can also be set arbitrarily in accordance with the expected rotating tool.

[0053] Fig. 9 is a perspective view showing the configuration of a lower arm removal tool according to a modified example of the second embodiment. As shown in Fig. 9, instead of the mounting hole, protrusions 164, 165 to which a rotating tool can be attached can be provided as the mounting portion. The shape and size of these protrusions 164, 165 can also be set arbitrarily according to the assumed rotating tool. In the first embodiment, a configuration is also possible in which a protrusion to which a rotating tool can be attached is provided instead of the mounting hole 14. Also, a combination of a mounting hole and a mounting protrusion may be provided.

[0054] FIG. 10 is a plan view showing the configuration of a lower arm removal tool 210 according to a further modified example of the second embodiment. As shown in FIG. 10, the base 211 has a substantially V-shaped plate shape, and the left and right end portions 211L and 211R are provided with a first hanging portion 212 and a second hanging portion 213, which respectively extend in a normal direction (perpendicular to the paper surface of FIG. 10) from an installation surface 211a, which is the surface of the base 211. In other words, in the base 211, the first hanging portion 212 and the second hanging portion 213 are provided apart from each other in a first direction D21 connecting the left and right end portions 211L and 211R. As long as the first hanging portion 212 and the second hanging portion 213 are arranged in the first direction D21 in this way, a shape in which the installation surface does not extend along the first direction, like the base 11 of the first embodiment and the base 111 of the second embodiment, is also possible. Although not shown, the first hanging portion 212 and the second hanging portion 213 are provided with grooves similar to the grooves 12g of the first hanging portion 12 and the grooves 13g of the second hanging portion 13 in the first embodiment.

[0055] An arm 216 is provided so as to extend vertically downward from a root portion 211n of the V-shape at the center of the base 211. At the lower end of the arm 216, a first mounting hole 214 having a rectangular cross section perpendicular to the thickness direction and a diamond-shaped second mounting hole 215 are formed as mounting portions, which penetrate the arm 216 in the thickness direction. The lower arm removal tool 210 shown in FIG. 10 can be removed by mounting a rotary tool in either the first mounting hole 214 or the second mounting hole 215, abutting the installation surface 211a against the left side surface 20c of the lower arm 20, and rotating the rotary tool in the same manner as in the first and second embodiments, so as to set the first hanging portion 212 and the second hanging portion 213 to a hanging state in which they are hung on the upper surface 20a and the lower surface 20b of the lower arm 20, respectively. Other functions, effects, and modifications are similar to those of the first embodiment. Although the present invention has been described with reference to the above-mentioned embodiment, the present invention is not limited to the above-mentioned embodiment, and improvements or modifications can be made within the scope of the invention or the purpose of the improvements. [Explanation of symbols]

[0056] 10, 110 Lower arm removal tool 11, 111, 211 base 11a, 111a, 211a Installation surface 11b Back 12, 112, 212 1st hanging part 12g, 112g groove 13, 113, 213 2nd hanging part 13g, 113g groove 14 Mounting hole (mounted part) 14x, 114x, 115x center axis 15 Spinner (rotating tool) 15a Mounting part 15b Handle section 20 Lower Arm 20a top surface 20b Bottom side 20c left side 21 Ball joint 22 Joint bolt 23 Joint nut 30 Knuckle 114, 214 1st mounting hole (mounted part) 115, 215 2nd mounting hole (mounted part) 116, 216 arm 116a surface 164, 165 Projection (mounted part) D1, D11, D21 1st direction D12 2nd direction Dn Normal direction

Claims

1. A lower arm removal tool for removing a lower arm attached to an attachment target, A base having a mounting surface; A first hanging portion and a second hanging portion are installed apart from each other on the installation surface and extend along a normal direction of the installation surface; Equipped with The base portion includes a mounting portion for removably mounting a rotating tool that rotates the base portion, and the rotating tool is rotatable around a central axis extending in the normal direction in the mounting portion, a lower arm removal tool characterized in that the installation surface is brought into contact with a side surface of the lower arm, the first hanging portion arranged on the attachment object side is hung on the upper surface of the lower arm, and the second hanging portion arranged at a position farther from the attachment object than the first hanging portion is hung on the lower surface of the lower arm, and then the rotating tool attached to the attachment portion is rotated from this hanging state to rotate the base about the central axis, thereby applying a force to the lower arm in a direction to remove it from the attachment object.

2. The lower arm removal tool according to claim 1 , wherein the first hook portion and the second hook portion are arranged along a first direction on the installation surface.

3. The lower arm removal tool according to claim 2 , wherein the installation surface extends along the first direction.

4. an arm portion extending from the base portion in a second direction that is a direction different from the first direction in a planar direction of the installation surface, 3. The lower arm removal tool according to claim 2, wherein the mounting portion is provided at a tip end of the arm portion.

5. 5. The lower arm removal tool according to claim 4, wherein the arm portion extends below the lower arm in the hooked state and is operated within a range below the lower arm.

6. 5. The lower arm removal tool according to claim 4, wherein the second direction is a direction perpendicular to the first direction or a direction inclined toward the first hook portion.

7. 2. The lower arm removal tool according to claim 1, wherein the first hook portion and the second hook portion are rod-shaped members extending along the normal direction.

8. 3. The lower arm removal tool according to claim 2, wherein a distance between the first hook portion and the second hook portion in the first direction is greater than a distance between the upper surface and the lower surface of the lower arm.

9. 9. The lower arm removal tool according to claim 1, wherein the base portion, the first hook portion and the second hook portion are formed from chrome molybdenum steel, carbon steel or manganese molybdenum steel.

10. A lower arm removal tool set for rotating a lower arm attached to an object to remove the lower arm from the object, A base having a mounting surface; A first hanging portion and a second hanging portion are installed apart from each other on the installation surface and extend along a normal direction of the installation surface; A rotating tool extending in a rod shape for rotating the base portion; Equipped with The base portion includes a mounting portion for removably mounting the rotary tool, The rotating tool is rotatable around a central axis extending in the normal direction in the mounting portion, a lower arm removal tool set characterized in that the installation surface is brought into contact with the lower arm, the first hanging portion arranged on the side of the attachment object is hung on the upper surface of the lower arm, and the second hanging portion arranged at a position farther from the attachment object than the first hanging portion is hung on the underside of the lower arm, and then the rotating tool attached to the attachment portion is rotated downward to rotate the base about the central axis, thereby applying a force to the lower arm in a direction to remove it from the attachment object.

Images