JP6654495B2 - Hub removal tool - Google Patents

Description

  The present invention relates to a hub extracting tool for extracting a hub from between an axle and a knuckle.

  2. Description of the Related Art As a wheel support structure for an automobile or the like, a structure including a hub for mounting a wheel is known (see Patent Document 1). For example, the hub is coupled to an end of an axle (drive shaft), and is rotatably held on a knuckle via a bearing. Generally, the hub has a cylindrical base portion press-fitted between the outer periphery of the axle and the inner periphery of the knuckle, and a disk-shaped flange portion formed at one end side of the base portion (the end of the axle outside the vehicle). And The flange portion is provided outside the knuckle, and a plurality of hub bolts for mounting a wheel or the like are erected on the outer surface of the flange portion at intervals in the circumferential direction.

  When repairing or inspecting an automobile, the hub may be removed from between the axle and the knuckle. A slide hammer is often used to remove the hub, and the hub press-fitted between the axle and the knuckle is pulled out by the slide hammer.

JP 2003-136907 A

  When removing the hub using a slide hammer, an adapter for the hub is attached to the slide hammer, the hub is fixed, and the operation of hammering is performed by sliding the hammer in the direction in which the hub is removed. However, since the hub is press-fitted into the bearing of the knuckle and is firmly fixed, it is necessary to repeatedly perform hammering when removing the hub, which takes time and effort. In addition, when a slide hammer is used, the noise generated when hitting the hammer is loud, and the hub may be damaged by the impact of the hit. Also, there is a demand at a store or the like to easily remove the hub with an inexpensive hand tool.

  SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and one of its objects is to provide a hub extracting tool that can easily extract a hub from between an axle and a knuckle.

  (1) A hub extraction tool according to one aspect of the present invention includes a cylindrical base press-fitted between an outer periphery of an axle and an inner periphery of a knuckle, and a disk-shaped outer surface formed at one end of the base. And a flange having a flange on which a plurality of hub bolts are erected at intervals in a circumferential direction of an outer surface of the hub, between the axle and the knuckle. The hub extracting tool includes a connecting member and an eccentric cam piece. The coupling member is disposed along an outer surface of the flange portion, and a fastening portion to be fastened to a hub bolt at a position radially opposed to the hub bolt, and a radially outer portion of the flange portion from both ends of the fastening portion. And an extension portion extending to the same. The eccentric cam piece is rotatably supported by each of the extending portions, and obtains a reaction force in the pull-out direction of the hub, so that the amount of protrusion of the hub in the press-fitting direction can be changed by rotation.

  According to the hub extraction tool according to the above aspect, the eccentric cam pieces are rotatably supported by the extending portions of the connecting members fastened to the hub bolts and fixed to the hub, and by rotating both eccentric cam pieces, The load in the pull-out direction can be input to the hub, and the hub can be easily removed manually. Specifically, the amount of protrusion of the eccentric cam piece in the press-fit direction of the hub increases in a state where the peripheral surface of the eccentric cam piece is in contact with the fixing member located radially outside the flange portion of the hub. The eccentric cam piece is rotated in the direction, and the fixing member is pressed by the eccentric cam piece. The eccentric cam piece presses the fixing member and applies a pressing load to the fixing member in the same direction as the direction of press-fitting of the hub, whereby a reaction force acts on the eccentric cam piece from the fixing member in the direction in which the hub is removed. As a result, a load in the pulling-out direction of the hub acts on the connecting member via the eccentric cam piece, and a load in the pulling-out direction can be input to the hub. In addition, since the eccentric cam pieces are arranged at positions facing each other in the radial direction of the flange portion, the load in the pull-out direction of the hub acts evenly on the connecting member, and the load in the pull-out direction is applied to the hub. You can type effectively. Therefore, by using the hub extracting tool, the hub press-fitted between the axle and the knuckle can be easily extracted. When the above-mentioned hub removing tool is used, the working time can be shortened and the noise and impact generated when the hub is removed can be greatly reduced as compared with the conventional slide hammer.

  Since the hub extracting tool has a simple configuration, it can be manufactured at low cost.

1 is a schematic cross-sectional view illustrating a configuration example of a wheel support structure of an automobile. It is an outline perspective view showing the example of composition of the hub removal tool concerning an embodiment. It is a figure explaining an example of the usage of the hub removal tool concerning an embodiment, and is a schematic perspective view showing a fixed plate. It is a figure explaining an example of the usage of the hub removal tool concerning an embodiment, and is a schematic sectional view showing the state where the fixed plate was attached. It is a figure explaining an example of the usage of the hub removal tool concerning an embodiment, and is a schematic sectional view showing the state where the connecting member was attached to the hub. It is a figure explaining an example of the usage of the hub removal tool concerning an embodiment, and is a schematic top view which looked at an eccentric cam piece from the upper part.

  Hereinafter, specific examples of the hub extracting tool according to the embodiment of the present invention will be described with reference to the drawings. In the following description, first, an example of a wheel support structure including a hub will be described with reference to FIG. 1, and then, a hub extraction tool of the embodiment will be described with reference to FIGS. 2 to 6.

<Axle support structure>
A wheel support structure 100 shown in FIG. 1 is an example of a front wheel support structure of an automobile (a so-called FF vehicle) in which an engine is mounted on a front part of a vehicle and driven by the front wheels. And a vertical cross-sectional view taken in the vertical direction at the end of the drive shaft 120. As shown in FIG. 1, the wheel support structure 100 supports a hub 110 to which wheels (not shown) are attached, a drive shaft 120 that transmits driving force from an engine (not shown), and the drive shaft 120. A knuckle 130 for giving a steering angle to the front wheels. The hub 110 is fitted to the end of the drive shaft 120, and is held by the knuckle 130 via a bearing 131. A screw portion 121 is formed at the tip of the drive shaft 120, and a hub nut 122 is fastened to the screw portion 121 so that the hub 110 does not come off from the drive shaft 120. The bearing 131 is press-fitted into the knuckle 130, and the hub 110 is attached by being press-fitted into the bearing 131.

(Hub)
The hub 110 has a cylindrical base 111 that is press-fitted between the outer circumference of the drive shaft 120 and the inner circumference of the knuckle 130 (bearing 131), and a disk formed on one end side (end on the outside of the vehicle) of the base 111. And a flange portion 112 in a shape of a circle. The flange portion 112 is provided outside the knuckle 130, and a plurality of hub bolts 113 for attaching wheels and the like are provided on the outer surface (outer surface of the vehicle) of the flange portion 112 at intervals in the circumferential direction. I have. In this example, four hub bolts 113 are erected at equal intervals in the circumferential direction from the outer surface of the flange portion 112 toward the outside of the vehicle, and two hub bolts 113 radially opposed to the outer surface of the flange portion 112 are provided. There are two sets of hub bolts 113 (see FIG. 3).

<Hub removal tool>
The hub extracting tool 1 is a tool for extracting the hub 110 press-fitted between the drive shaft 120 and the knuckle 130 in the wheel support structure 100 described above, and as shown in FIG. 2, the connecting member 10 and the eccentric cam And a piece 20. In this example, in addition to these members, a fixing plate 30 (see FIGS. 3 and 4) and an input bar 40 (see FIGS. 5 and 6) are provided.

(Connecting member)
As shown in FIG. 2, the connecting member 10 is a flat bar-shaped member, is arranged along the outer surface of the flange portion 112 of the hub 110 (see FIG. 5), and connects the fastening portion 11 and the extension portion 12. Have.

<Fastening part>
The fastening portion 11 is a portion that fixes the connecting member 10 to the hub 110 (see FIG. 5), is arranged on the outer surface of the flange portion 112, and is fastened to the hub bolt 113. The fastening portion 11 is arranged so as to extend over the hub bolts 113 diametrically opposed to each other among the hub bolts 113 erected on the outer peripheral surface of the flange portion 112, and is fastened to these hub bolts 113. In the fastening portion 11, through holes 11h are formed at positions corresponding to the two hub bolts 113 facing in the radial direction, respectively. The hub bolts 113 are inserted into the through holes 11h of the fastening portion 11, and the hub bolts 113 are formed. By fastening the nuts 11n to the hub bolts 113, the fastening portions 11 are fastened to the hub bolts 113, respectively. Thereby, the fastening portion 11 is fastened to the flange portion 112, and the connecting member 10 is fixed to the hub 110.

<Extension>
The extending portions 12 are portions that extend from both ends of the fastening portion 11 to the outside in the radial direction of the flange portion 112 (see FIG. 5), and are located at both ends of the connecting member 10, and the flange portions sandwich the fastening portion 11. 112 are formed at positions facing each other in the radial direction. An eccentric cam piece 20 to be described later is attached to the extension portion 12, respectively.

(Eccentric cam piece)
As shown in FIG. 2, the eccentric cam pieces 20 are rotatably supported by the extending portions 12 of the connecting member 10, respectively, and are disposed radially outside the flange portions 112 of the hub 110 (see FIG. 5). ). Since the eccentric cam piece 20 obtains a reaction force in the pulling-out direction of the hub 110, the amount of projection of the hub 110 in the press-fitting direction can be changed by rotation. Specifically, the rotation shaft of the eccentric cam piece 20 is provided in the extension direction of the extension portion 12. In this example, the rotation axis of the eccentric cam piece 20 is formed by forming a through hole 20h at an eccentric position of the eccentric cam piece 20 and inserting a bolt 20b into the through hole 20h to fix the eccentric cam piece 20 to the end face of the extension portion 12. The eccentric cam piece 20 is rotatable around the bolt 20b as a rotation axis. The eccentric cam piece 20 is formed so that the diameter from the center of rotation to the outer peripheral surface continuously changes in the circumferential direction so that the amount of protrusion of the hub 110 in the press-fitting direction is variable by rotation. Has an outer peripheral surface (cam surface 21) whose diameter increases from one side to the other. In this example, as shown in FIG. 6, the diameter of the cam surface 21 from the center of rotation is smallest at an intermediate position in the circumferential direction, and becomes larger as the distance from the intermediate position increases. The eccentric cam pieces 20 are respectively arranged at radially opposite positions of the flange portion 112, and the two eccentric cam pieces 20 are arranged point-symmetrically with respect to the center of the connecting member 10 (the fastening portion 11). Each extension 12 is attached to each.

  The eccentric cam piece 20 is provided with an input section 22 for rotating the eccentric cam piece 20. The input portion 22 is attached to a position shifted in the width direction from the rotation center of the eccentric cam piece 20 when the eccentric cam piece 20 is viewed in a plan view, and is formed so as to extend outward in the plane direction of the eccentric cam piece 20. (See FIGS. 5 and 6). In this example, as shown in FIGS. 5 and 6, an input bar 40 extending the input unit 22 is attached to facilitate the rotation operation of the eccentric cam piece 20. The length of the input portion 22 can be adjusted by the input bar 40, and the force at the time of rotating the eccentric cam piece 20 can be reduced by the principle of leverage by the length of the input bar 40.

(Fixed plate)
In this example, a fixing member that abuts against the eccentric cam piece 20 (cam surface 21) on the radially outer side of the flange portion 112 of the hub 110 to cause the eccentric cam piece 20 to act on the eccentric cam piece 20 in the pulling direction of the hub 110. And a fixing plate 30 (see FIGS. 3 and 4).

  The fixing plate 30 shown in FIGS. 3 and 4 is a rectangular frame-shaped member, and is attached so as to surround the outer periphery of the flange 112. The fixing plate 30 is disposed radially outward of the flange portion 112, and extends radially inward from the frame portion 30 f and the frame portion 30 f in contact with the eccentric cam piece 20 (cam surface 21). And a sandwiching portion 30i sandwiched in a gap between the distal end portion. As shown in FIG. 4, the fixing plate 30 has an outer surface (an outer surface of the vehicle) of the sandwiching portion 30i facing a back surface (an inner surface of the vehicle) of the flange portion 112. The fixing plate 30 has the back surface of the sandwiching portion 30i supported by the end surface of the knuckle 130 and the inner peripheral side of the sandwiching portion 30i disposed between the inner peripheral side of the back surface of the flange portion 112 and the bearing 131. It can be stably arranged between the back surface of the flange portion 112 and the end surface of the knuckle 130. In this example, as shown in FIG. 3, the fixed plate 30 is divided into two and includes first and second plate pieces 31 and 32. Each of the plate pieces 31 and 32 is formed in a C shape in plan view. Bolts 31b project from the opposing first side 31a of the first plate piece 31 toward the second plate 32, and the opposing second side 32a of the other second plate 32. Is formed with a through hole 32h through which the bolt 31b is inserted. Each bolt 31b of the first plate piece 31 is inserted into each through hole 32h of the second plate piece 32, and a nut 32n is fastened to each bolt 31b. 30 are configured.

  The first plate piece 31 is provided with a planar abutting portion 33 covering each outer surface (outer surface of the vehicle) from the first side 31a to the second side 32a of the second plate 32. Have been. As shown in FIG. 6, the cam surface 21 of the eccentric cam piece 20 comes into contact with the outer surface of the contact portion 33.

  The material of the connecting member 10, the eccentric cam piece 20, the fixing plate 30, and the input bar 40 constituting the hub extracting tool 1 is not particularly limited, and examples thereof include steel, stainless steel, and aluminum alloy.

<How to use the hub removal tool>
Hereinafter, with reference to FIGS. 3 to 6, the hub removal tool 1 of the embodiment is used to remove the hub 110 from between the drive shaft 120 and the knuckle 130 in the wheel support structure 100 described with reference to FIG. 1. An example of a sampling method will be described. The operation procedure for removing the hub 110 using the hub removal tool 1 includes a plate attaching step of attaching the fixing plate 30, a connecting member fixing step of fixing the connecting member 10 to the hub 110, and a cam rotation for rotating the eccentric cam piece 20. And a step. Before the operation, in the wheel support structure 100, the wheel and the brake disk attached to the flange 112 of the hub 110 are removed, and the hub nut 122 (see FIG. 1) attached to the tip of the drive shaft 120 is removed. .

(Plate mounting process)
In the plate attaching step, as shown in FIG. 3, the first and second plate pieces 31, 32 are attached from both right and left sides of the hub 110 so as to surround the outer periphery of the flange 112, and as shown in FIG. The sandwiching portion 30i is sandwiched in a gap between the knuckle 130 and the tip of the knuckle 130. Then, the nut 32n is fastened to the bolt 31b, and the first plate piece 31 and the second plate piece 32 are integrated to fix the fixed plate 30 so as to surround the outer periphery of the flange portion 112. As a result, the frame portion 30f of the fixing plate 30 is arranged radially outside the flange portion 112. In the case of FIG. 4, the first side 31a of the plate piece 31 and the second side 32a of the plate piece 32 are arranged at positions vertically opposed to each other. A contact portion 33 is provided.

(Connecting member fixing process)
In the connecting member fixing step, as shown in FIG. 5, the connecting member 10 is arranged along the outer surface of the flange 112 of the hub 110, and the diameter of the plurality of hub bolts 113 erected on the outer surface of the flange 112. The fastening portion 11 is fastened to the hub bolt 113 at a position facing the direction. In the case of FIG. 5, the connecting member 10 is arranged on the outer surface of the flange portion 112 along the up-down direction, and two hub bolts 113 vertically arranged in each through hole 11 h of the fastening portion 11 are inserted into the hub bolt 113. The fastening portion 11 is fastened to the hub bolt 113 by fastening the nut 11n. Thus, the fastening portion 11 is fastened to the flange portion 112, and the connecting member 10 is fixed to the hub 110.

  When the connecting member 10 is fixed to the hub 110, the eccentric cam pieces 20 rotatably supported by the respective extending portions 12 of the connecting member 10 are respectively brought into contact with the frame portions 30 f of the fixing plate 30. In the case of FIG. 5, the eccentric cam pieces 20 are arranged at positions facing each other up and down, and each eccentric cam piece 20 is in contact with a contact portion 33 provided on the frame portion 30f. At this time, as shown in FIG. 6, the cam surface 21 of the eccentric cam piece 20 is brought into contact with the outer surface of the contact portion 33, and the intermediate position in the circumferential direction of the cam surface 21 is brought into contact with the outer surface of the contact portion 33. Make contact.

(Cam rotation process)
In the cam rotation process, the eccentric cam pieces 20 are respectively rotated to change the amount of protrusion of the eccentric cam pieces 20 in the press-fitting direction, thereby obtaining a reaction force in the pull-out direction of the hub 110. Specifically, as shown in FIG. 6, the input bar 40 attached to the input section 22 of the eccentric cam piece 20 is operated to rotate the eccentric cam piece 20. In this example, the rotation directions of the upper eccentric cam piece 20 and the lower eccentric cam piece 20 are reversed, and the upper eccentric cam piece 20 is rotated clockwise (see FIG. 6) and the lower eccentric cam piece 20 is rotated. The eccentric cam piece 20 is rotated counterclockwise. That is, the input bars 40 are operated such that the free ends of the input bars 40 approach each other and the input bars 40 cross each other.

  The reason why a reaction force in the pull-out direction of the hub 110 is obtained will be described. By rotating the eccentric cam piece 20 from the state shown in FIG. 6, the amount of protrusion of the eccentric cam piece 20 in the direction of press-fitting of the hub increases, and the eccentric cam piece 20 is moved to the frame portion 30 f of the fixed plate 30 (the contact portion 33 ) Is pressed. As shown in FIGS. 5 and 6, the eccentric cam piece 20 presses the frame portion 30f, and applies a pressing load (indicated by a black arrow in the drawing) in the same direction as the press-fit direction of the hub 110 to the frame portion 30f. Thus, a reaction force is obtained from the frame portion 30f to the eccentric cam piece 20 in the pulling-out direction of the hub 110. As a result, a load (indicated by a white arrow in the drawing) acts on the connecting member 10 through the eccentric cam piece 20 in the pulling direction of the hub 110, and the load in the pulling direction is input to the hub 110. This is because the connecting member 10 is fastened to the hub bolt 113 at the fastening portion 11 and is integrated with the flange portion 112, and the hub 110 is pulled out from the rear side of the flange portion 112 to the outside of the vehicle via the hub bolt 113. It is. Therefore, the hub 110 press-fitted between the drive shaft 120 and the knuckle 130 can be easily removed.

<Effects>
According to the hub removal tool 1 of the embodiment, the eccentric cam pieces 20 are rotatably supported by the extending portions 12 of the connecting member 10 fixed to the hub 110, and the two eccentric cam pieces 20 are rotated. , The load in the extraction direction can be input to the hub 110. In addition, since the eccentric cam pieces 20 are respectively arranged at radially opposite positions of the flange portion 112, the load in the pull-out direction of the hub 110 acts on the connecting member 10 evenly, and the pull-out direction is applied to the hub 110. Can be input effectively. Therefore, the hub 110 can be easily extracted from between the drive shaft 120 and the knuckle 130 by using the hub extraction tool 1.

  The present invention is not limited to these examples, but is indicated by the appended claims, and is intended to include all modifications within the scope and meaning equivalent to the appended claims. For example, in the above-described embodiment, a configuration in which the fixing plate 30 is used as a fixing member that comes into contact with the eccentric cam piece 20 and applies a reaction force to the eccentric cam piece 20 in the pull-out direction of the hub 110 will be described as an example. explained. Instead of using the fixing plate 30, it is also possible to use a vehicle component (for example, a knuckle) as the fixing member.

  INDUSTRIAL APPLICABILITY The hub removal tool of the present invention can be used for removing a hub in a vehicle wheel support structure.

DESCRIPTION OF SYMBOLS 1 Hub removal tool 10 Connecting member 11 Fastening part 11h Through hole 11n Nut 12 Extension part 20 Eccentric cam piece 20h Through hole 20b Bolt 21 Cam surface 22 Input part 30 Fixing plate 30f Frame part 30i Nipping part 31 First plate piece 32 First 2 plate piece 31b bolt 32h through hole 32n nut 31a first side 32a second side 33 contact part 40 input bar 100 wheel support structure 110 hub 111 base 112 flange part 113 hub bolt 120 drive shaft (axle)
121 Screw part 122 Hub nut 130 Knuckle 131 Bearing

Claims (1)

It has a cylindrical base press-fitted between the outer periphery of the axle and the inner periphery of the knuckle, and a disk-shaped outer surface formed on one end side of the base, and is spaced apart in the circumferential direction of the outer surface. A hub extracting tool for extracting a hub having a flange portion on which a plurality of hub bolts are erected from between an axle and a knuckle,
A fastening portion arranged along the outer surface of the flange portion and fastened to a hub bolt at a position radially opposed to the hub bolt, and an extension extending from both ends of the fastening portion to a radial outside of the flange portion. A connecting member having a protrusion,
An eccentric cam piece rotatably supported by each of the extending portions and capable of varying the amount of protrusion of the hub in the press-fitting direction by rotation in order to obtain a reaction force in the removal direction of the hub; tool.

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