Lower arm removal tool and lower arm removal tool set

Abstract

To provide a lower arm removing tool and a lower arm removing tool set capable of removing a lower arm by a simple operation without damaging a peripheral component.SOLUTION: A base having an installation surface, and a first hooking portion and a second hooking portion which are installed on the installation surface so as to be separated from each other and extend along a normal direction of the installation surface, the rotating tool is rotatable around a central axis extending in a normal direction in the mounted portion, and rotates the rotating tool mounted on the mounted portion from a latched state in which the installation surface is brought into contact with the side surface of the lower arm, the first latching portion is latched to the upper surface of the lower arm, and the second latching portion is latched to the lower surface of the lower arm, to rotate the base portion around the central axis, thereby applying a force in a direction of detachment from the attachment target to the lower arm.SELECTED DRAWING: Figure 1

Description

[Technical Field]

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

[0002] In a vehicle suspension device, for example, disclosed in Patent Document 1, the lower end of a knuckle member that rotatably supports a wheel is connected to the vehicle body via a lower arm. The knuckle member has an insertion hole through which a drive shaft is inserted. The lower arm consists of two link members, one front and one rear. The front link member extends approximately linearly along the vehicle width direction, and one end of the front link member is pivotally connected to the lower end of the knuckle member via a ball joint. The other end is connected to a cross member via a rubber bushing whose axis extends in the fore-and-aft direction of the vehicle body so as to be able to swing up and down. The pivotal connection is achieved by inserting a joint bolt extending from the ball joint into the knuckle member and threading a joint nut onto the tip of the joint bolt extending from the knuckle member. Lower arms are also used in steering devices and other devices. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2001-63330 Summary of the Invention [Problem to be solved by the invention]

[0004] It may be necessary to remove the lower arm for purposes such as replacement, inspection, maintenance, etc. of the lower arm, ball joint, joint boot that covers the ball joint, knuckle, etc. Conventionally, removal of the lower arm has been performed using tools such as a tie rod end puller, ball joint knock remover, or joint puller.

[0005] However, tie rod end pullers, ball joint knock removers, and joint pullers were not originally designed for removing lower arms, and therefore were not suitable for removing lower arms that are surrounded by knuckle members, wheel covers, suspension, and other components. In other words, work using conventional tools requires space around the lower arm for the tool's operating range and for the worker's hands to reach the tool. Lower arm removal work with limited space makes it difficult to perform the work efficiently, and there is a risk of unintentional damage to surrounding components due to excessive work. While it is possible to secure work space by removing surrounding components in advance, this would further increase the work time and is therefore undesirable from the perspective of reduced work efficiency.

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

[0007] In order to solve the above problem, 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, and comprises a base having an installation surface, and a first hanging portion and a second hanging portion that are installed at a distance from each other on the installation surface and extend along the normal direction of the installation surface, the base has an attachment portion for removably attaching a rotating tool that rotates the base, the rotating tool is rotatable around a central axis extending in the normal direction at the attachment portion, and the installation surface is brought into contact with the side of the lower arm, and the first hanging portion arranged on the attachment object side is attached to the upper surface of the lower arm, and the second hanging portion arranged farther from the attachment object than the first hanging portion is attached to the underside of the lower arm, and from this attached state, the rotating tool attached to the attachment portion is rotated to rotate the base around 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 and second hooking portions 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 be 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 and second hooking portions 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 engaging portion and the second engaging 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 engaging portion, and the second engaging 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 that 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 that 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 that extends 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 located on the attachment object side on the upper surface of the lower arm and the second hanging portion located 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 around the central axis, a force is applied to the lower arm in a direction to remove it from the attachment object. [Effects of the Invention]

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

[0018] [Figure 1] 1 is a perspective view showing the configuration of a lower arm removal tool according to a first embodiment of the present invention. [Figure 2] FIG. 1 is a perspective view showing the relationship between a lower arm and an object to which the lower arm is attached in a first embodiment of the present invention. [Figure 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. [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. [Figure 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. 10 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. 10 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. 10 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. 10 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. 10 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 INVENTION

[0019] Hereinafter, 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 with reference to the drawings. First Embodiment Figure 1 is a perspective view showing the configuration of a lower arm removal tool 10 according to the first embodiment. As shown in Figure 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 made up of the lower arm removal tool 10 and a spinner 15, which serves as a rotating tool, shown in Figures 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. An attachment hole 14 is provided in the installation surface 11a at the center of the first direction D1, penetrating the base 11 in the thickness direction, i.e., in the normal direction Dn of the installation surface 11a, and serving as an attachment portion. A first hanging portion 12 and a second hanging portion 13 are provided at symmetrical positions with respect to the attachment 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 hooking portion 12 is provided with four grooves 12g recessed along the circumferential direction at equal intervals along its axial direction, i.e., along the normal direction Dn, and the second hooking portion 13 is also provided with four grooves 13g recessed along the circumferential direction at equal intervals along its axial direction. The four grooves 12g of the first hooking portion 12 and the four grooves 13g of the second hooking portion 13 are provided in the same shape and at corresponding positions in the normal direction Dn. With this configuration, when the first hooking portion 12 and the second hooking 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, thereby increasing the hooking force.

[0023] The base 11, the first attachment portion 12, and the second attachment 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 rotary tool is not limited to spinner 15, and for example, a ratchet wrench or a box wrench can be used. Base 11 is provided with an attachment hole or attachment protrusion shaped to correspond to the attachment portion of the rotary tool as an attachment portion, and base 11 shown in FIG. 1 is provided with attachment hole 14 having a diamond-shaped cross section into which attachment portion 15a of spinner 15 can be attached.

[0025] Next, the process of removing the lower arm 20 will be described with reference to FIGS. 2(a) and 2(b) are perspective views showing the relationship between the lower arm 20 and the knuckle 30 to which it is attached, with 2(a) showing the state before the start of the removal process and 2(b) showing the state after the removal process has been completed. Each of 2(a) to 2(b) 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, the process of removing a lower arm when it is attached to a general suspension device will be described, but the same removal process can also be performed for lower arms attached to other devices, such as steering devices.

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

[0028] The removal process of the lower arm 20 is performed with the joint nut 23 loosened by a predetermined amount, that is, with the joint nut 23 threaded onto the tip of the joint bolt 22 preventing the lower arm 20 from coming off even when the removal process makes the lower arm 20 detachable from the knuckle 30. In addition, in cases where the lower arm 20 is allowed to fall after being removed, 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 rotary 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 peripheral surface of the first hanging portion 12 is brought into contact with the upper surface 20a of the lower arm 20, and the outer peripheral surface of the second hanging portion 13 is brought into contact with the lower surface 20b of the lower arm 20. This brings about 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 and second hooking portions 12 and 13 are hooked.

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

[0032] As shown in Figure 4, when the spinner 15 is rotated downward in a counterclockwise direction (direction R1 in Figure 4) in the hooked state, a force acts on the base 11 to rotate in the counterclockwise direction (direction R2 in Figure 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 way, a force acting counterclockwise (direction R3 in Figure 4) downward 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 work is 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 effects. (1) The removal work can be performed by hooking the first hooking portion 12 and the second hooking 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 the knuckle 30, the removal work can be easily performed without damaging surrounding structures, etc. (2) Since there is only a space below the lower arm 20 where 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) The mounting hole 14 is a rectangular hole that penetrates the base 11 in the thickness direction. Therefore, the lower arm 20 can be removed by mounting a general turning 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 that the distance be greater than the distance between the upper surface 20a and the lower surface 20b of the lower arm 20 to be hung.

[0036] The first and second hooking portions 12 and 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. Furthermore, the first and second hooking portions 12 and 13 may have a shape other than rod-shaped, such as a protrusion, as long as they can be hooked onto the upper surface 20a and lower surface 20b of the lower arm 20, respectively. Furthermore, it is preferable to provide a locking portion folded back toward the corresponding hooking portion at the tip of at least one of the first and second hooking portions 12 and 13, as this stabilizes the position of the lower arm removal tool 10 relative to the lower arm 20 during the removal operation.

[0037] The base 11 is shaped like a roughly 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, and can also be shaped like, for example, a long plate or a block.

[0038] Although four grooves 12g and four grooves 13g are provided in each of the first and second hooking portions 12 and 13, 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 and 13g are provided at least in the range where the first and second hooking portions 12 and 13 contact the lower arm 20.

[0039] Instead of or in addition to the grooves 12g and 13g, the surfaces of the first and second hooking portions 12 and 13 may be provided with small 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 abut against the side surface of the lower arm 20, it may include an uneven or curved surface.

[0041] Second Embodiment Figure 6 is a perspective view showing the configuration of a lower arm removal tool 110 according to the second embodiment. Figures 7 and 8 each show the lower arm removal tool 110 placed on the lower arm 20 attached to the knuckle 30 as the 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. Similar to the first embodiment, a first hooking portion 112 and a second hooking portion 113 are provided on the installation surface 111a at symmetrical positions about the center of the surface in the first direction D11, and spaced apart from each other.

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

[0044] The arm 116 extends in a long plate shape in 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 extends linearly in the first direction D1 toward the first hanging part 112 side as it approaches the tip.

[0045] At the lower tip of arm portion 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 portion 116 in the thickness direction. First mounting hole 114 and second mounting hole 115 penetrate arm portion 116 along its thickness direction, in other words along the normal direction Dn, and have central axes 114x and 115x, respectively.

[0046] 7 and 8, the removal work 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 peripheral surface of the first hooking portion 112 into contact with the upper surface 20a of the lower arm 20, and bringing the outer peripheral surface of the second hooking 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 hooking portion 112 and the second hooking portion 113 are hooked onto the lower arm 20 from above and below.

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

[0048] More specifically, as shown in FIG. 8, when the spinner 15 is rotated downward and then rotated counterclockwise (in the direction of R11 in FIG. 8) in the state shown in FIG. 8, a force acts 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 hook portion 112, and the side of the lower arm 20 farther from the ball joint 21 is urged upward by the second hook portion 113, and 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, causing the joint bolt 22 pivotally attached to the knuckle 30 to be displaced downward.

[0049] In the lower arm removal tool 110 of the second embodiment, the spinner 15 is attached to the surface 116a of the arm 116. Therefore, as shown in FIG. 7, the spinner 15 can be removed with the handle portion 15b of the spinner 15 extending in a straight line along which the lower arm 20 extends. Therefore, when rotating the spinner 15, the lower arm 20 can be easily maintained in a position within a plane including the rotation direction. Therefore, the installation surface 111a is maintained in contact with the lower arm 20, and the rotation force of the spinner 15 is stably transmitted in the R11 direction shown in FIG. 8 without causing twisting or the like in the lower arm 20. Therefore, the lower arm 20 can be efficiently rotated. Furthermore, the arm 116 allows the distance between the first hook portion 112 and the second hook portion 113 and the mounting hole 115 to be increased, allowing for a greater force to be applied to the lower arm 20. This is particularly useful for 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, as long as it extends downward. For example, the angle formed 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 of the arm 116 can be set arbitrarily depending on the configuration of the lower arm 20 and its surroundings. For example, the angle formed between the first direction D11 and the second direction D12 may be 90 degrees. Also, the starting point of the arm 116 can be set at any position, not limited to the second hanging portion 13 side. Furthermore, if the arm 116 is long, twisting or the like is less likely to occur in the lower arm 20 when the spinner 15 is rotated, which is preferable.

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

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

[0053] Figure 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 Figure 9, instead of the mounting holes, protrusions 164, 165 onto which a rotary tool can be attached can also be provided as the mounting portion. The shape and size of these protrusions 164, 165 can also be set arbitrarily to match the expected rotary tool. In the first embodiment, it is also possible to provide a configuration in which a protrusion onto which a rotary 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 modification of the second embodiment. As shown in FIG. 10, the base 211 has a generally V-shaped plate shape, and left and right tip ends 211L, 211R are provided with a first hooking portion 212 and a second hooking portion 213, respectively, extending in a normal direction (a direction perpendicular to the plane of FIG. 10) from an installation surface 211a, which is the surface of the base 211. In other words, the first hooking portion 212 and the second hooking portion 213 are provided in the base 211 and spaced apart from each other in a first direction D21 connecting the left and right tip ends 211L, 211R. As long as the first hooking portion 212 and the second hooking portion 213 are arranged in the first direction D21, a shape in which the installation surface does not extend along the first direction, like the base 11 of the first embodiment or 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. A first attachment hole 214 and a diamond-shaped second attachment hole 215 are formed at the lower tip of the arm 216 as attachment portions, penetrating the arm 216 in the thickness direction and having a rectangular cross section perpendicular to the thickness direction. The lower arm removal tool 210 shown in FIG. 10 can be removed by attaching a rotary tool to either the first attachment hole 214 or the second attachment 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, thereby establishing an attached state in which the first hooking portion 212 and the second hooking portion 213 are hooked onto the upper surface 20a and the lower surface 20b of the lower arm 20, respectively. Other functions, effects, and modifications are the same as 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 spirit of the invention. [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 20 Lower arm 20a top surface 20b Bottom side 20c left side 21 Ball Joint 22 Joint bolt 23 Joint nut 30 Knuckles 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 that are spaced 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 detachably mounting a rotary tool that rotates the base portion, and the rotary 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 the 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 by rotating the rotating tool attached to the attachment portion from this hanging state, the base is rotated around 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 attachment portion is provided at the tip 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. 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 engaging portion and the second engaging 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 engaging portion and the second engaging 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 engaging portion, and the second engaging portion are formed from chromium molybdenum steel, carbon steel, or manganese molybdenum steel.

10. A lower arm removal tool set for rotating a lower arm attached to an attachment object and removing the lower arm from the attachment object, a base having a mounting surface; a first hanging portion and a second hanging portion that are spaced 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 that rotates the base portion; Equipped with the base portion includes a mounting portion for detachably mounting the rotary tool; the rotary tool is rotatable around a central axis extending in the normal direction in the attachment 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 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 from this hanging state, the rotary tool attached to the attachment portion is rotated downward to rotate the base around the central axis, thereby applying a force to the lower arm in a direction to remove it from the attachment object.

Images