Workpiece support jig

Abstract

To facilitate an operation for fastening a bolt to a fastening hole of a second workpiece.SOLUTION: A bolt fastening method includes: a step in which an oil pan support jig 10 is placed on a transmission case 200; a step in which an oil pan 100 is supported by the oil pan support jig 10 so that a through hole 101 provided in the oil pan 100 and a fastening hole 201 provided in the transmission case 200 face each other with a gap therebetween; a step in which a bolt 50 is inserted into the through hole 101 and the fastening hole 201 and held between the through hole 101 and the fastening hole 201 which are disposed spaced apart from each other; and a step in which the bolt 50 is fastened to the fastening hole 201 through the through hole 101.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention , Wa This relates to the work support jig. [Background technology]

[0002] When assembling a workpiece, which is a vehicle component, for example, assembling an oil pan to a transmission case, the oil pan is attached to the transmission case by fastening a plurality of bolts.

[0003] As an apparatus for assembling such an oil pan, for example, Patent Document 1 discloses an oil pan assembling apparatus that grasps and transports an oil pan with a hand unit that is movable in three axial directions, and places it on a cylinder block. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 6-31558 Summary of the Invention [Problem to be solved by the invention]

[0005] However, as shown in FIG. 9 , oil pan 100 is a thin member formed, for example, from sheet metal. Therefore, when bolt 50 is inserted through through-hole 101 of oil pan 100 and into fastening hole 201 of transmission case 200, only the tip of bolt 50 is held by through-hole 101 and fastening hole 201. This poses a problem of the inserted bolt 50 tipping over, as shown in FIG. 10 . Therefore, it is necessary to manually hold the bolt to prevent it from tipping over when tightening the bolt. This makes it impossible to tighten the bolts collectively using a nut runner, and the manual tightening of the bolts is cumbersome and time-consuming. In particular, the oil pan is circumferentially secured with many bolts, making the tightening process cumbersome.

[0006] As described above, an object of the present invention is to facilitate the operation of fastening a bolt into a fastening hole in a second workpiece. [Means for solving the problem]

[0007] In order to solve the above problems, the present invention provides: A workpiece support jig including a support portion that supports a first workpiece having a through hole and an abutment portion that abuts against a second workpiece having a fastening hole, wherein the support portion supports the first workpiece so that the through hole and the fastening hole face each other with a gap therebetween, and the support portion releases the support state for the first workpiece by a force that fastens a bolt inserted into the fastening hole via the through hole to the fastening hole. It is characterized by:

[0008] According to the bolt tightening method of the present invention, the bolt can be held between the through hole and the fastening hole that are spaced apart, and therefore the bolt inserted into the through hole and the fastening hole can be prevented from falling over, which makes it possible to automate the bolt tightening work and to facilitate manual tightening work.

[0009] The present invention also features a work support jig that includes a support portion that supports a first workpiece having a through hole and an abutment portion that abuts a second workpiece having a fastening hole, wherein the support portion supports the first workpiece so that the through hole and the fastening hole face each other with a gap between them.

[0010] According to the workpiece support jig of the present invention, the through-hole of the first workpiece and the fastening hole of the second workpiece can be arranged facing each other with a gap between them, which prevents the bolts inserted into the through-hole and the fastening hole from falling over and makes it easier to fasten the bolts into the fastening holes.

[0011] Furthermore, in the workpiece support jig of the present invention, the support portion can be configured to release the support state for the first workpiece by the force of fastening the bolt inserted into the fastening hole through the through hole into the fastening hole. This allows the force acting by the bolt fastening operation to automatically bring the through hole close to the fastening hole, making it possible to fasten the bolt into the fastening hole through the through hole. Therefore, a separate operation for releasing the support state by the workpiece support jig is not required, making the operation of fastening the bolt easier.

[0012] The work support jig of the present invention may further include a frame that holds the support portion and the abutment portion and surrounds the outer periphery of the first work. This allows the first work to be supported by the work support jig at a predetermined position by bringing the first work close to the work support jig along the frame. This facilitates the operation of supporting the first work on the work support jig. [Effects of the Invention]

[0013] According to the present invention, the bolt can be easily fastened into the fastening hole of the second workpiece. [Brief explanation of the drawings]

[0014] [Figure 1] FIG. 2 is a perspective view showing an oil pan, an oil pan support jig, and a transmission case. [Figure 2] FIG. 2 is a plan view showing the oil pan, the oil pan support jig, and the transmission case. [Figure 3] FIG. 4 is a cross-sectional view showing the periphery of a through hole and a fastening hole. [Figure 4] FIG. 2 is a plan view of the oil pan support jig according to the embodiment of the present invention. [Figure 5] FIG. 2 is a bottom view of the oil pan support jig according to the embodiment of the present invention. [Figure 6] FIG. 2 is a perspective view showing the underside of the oil pan support jig according to the embodiment of the present invention. [Figure 7] 3A to 3C are diagrams illustrating steps of a bolt tightening method according to the present embodiment. [Figure 8] FIG. 10 is a cross-sectional view of the oil pan support jig placed on the transmission case. [Figure 9] FIG. 1 is a cross-sectional view of a state in which an oil pan is placed directly on a transmission case. [Figure 10] FIG. 10 is a cross-sectional view showing the state in which the bolt in FIG. 9 has fallen. DETAILED DESCRIPTION OF THE INVENTION

[0015] An embodiment of the present invention will be described below with reference to the drawings. In the following description, an oil pan support jig for supporting an oil pan as a first workpiece will be exemplified as a workpiece support jig according to one embodiment of the present invention. This oil pan support jig is placed on a transmission case as a second workpiece. Furthermore, as an example of a bolt fastening method of the present invention, a method will be described in which bolts are inserted into through holes in the oil pan and fastening holes in the transmission case using this oil pan support jig and then fastened.

[0016] 1 and 2, oil pan support jig 10 of this embodiment is placed on transmission case 200 (see the direction of arrow A in FIG. 1). In this state, oil pan support jig 10 supports oil pan 100. More specifically, with oil pan support jig 10 placed in a predetermined position on transmission case 200, multiple plungers 12 provided on oil pan support jig 10 support the bottom side of the outer peripheral end of oil pan 100, as shown in FIG. 3, thereby supporting oil pan 100 in close proximity to transmission case 200.

[0017] As shown in Fig. 1, oil pan 100 is provided with a plurality of through holes 101 arranged circumferentially on its outer circumferential end side. Furthermore, transmission case 200 is provided with a plurality of fastening holes 201 corresponding to each of the through holes 101. Bolts are fastened to fastening holes 201 by passing through through holes 101 and gaskets attached to the fastening holes 201 of transmission case 200. Oil pan 100 is assembled to transmission case 200 by fastening each bolt to each fastening hole.

[0018] Next, the oil pan support jig 10 of this embodiment will be described in more detail with reference to Figures 4 to 6. Figure 4 is a plan view of the oil pan support jig of this embodiment, Figure 5 is a bottom view, and Figure 6 is a perspective view from diagonally below. Also, the oil pan support jig from diagonally above shown in Figure 1 will be referenced as appropriate.

[0019] The oil pan support jig 10 includes a circumferential frame portion 11, a plurality of plungers 12 as support portions, a plurality of positioning portions 13 as abutment portions, a plurality of mounting portions 14 as abutment portions, and a pair of gripping portions 15.

[0020] A gripping portion 15 is provided on the upper surface of frame portion 11, and a plunger 12, a positioning portion 13, and a mounting portion 14 are provided on the lower surface of frame portion 11. When oil pan support jig 10 supports oil pan 100, frame portion 11 is provided so as to surround the outer periphery of oil pan 100 (see FIG. 2).

[0021] Plunger 12 has a spherical portion 12a at its tip that abuts against oil pan 100 to support oil pan 100 (see FIG. 3). Spherical portion 12a of plunger 12 protrudes inward beyond frame portion 11 due to the biasing force of a spring provided inside plunger 12. Oil pan support jig 10 of this embodiment is provided with six plungers 12, each supporting oil pan 100 at a different location.

[0022] 6, positioning portion 13 has positioning pins 13a that protrude downward. Oil pan support jig 10 is positioned relative to transmission case 200 by inserting each positioning pin 13a into each knock hole 202 (see FIG. 1) of transmission case 200. Oil pan support jig 10 of this embodiment has positioning portions 13 provided in two locations.

[0023] The mounting portion 14 has a mounting surface on its lower surface. The mounting surface of the mounting portion 14 abuts against a predetermined location on the transmission case 200. The mounting surface of the mounting portion 14 has a shape corresponding to the surface on which the transmission case 200 is to be mounted, and in this embodiment, is flat. The oil pan support jig 10 of this embodiment has mounting portions 14 provided in two locations.

[0024] Next, each step of the bolt tightening method of this embodiment will be described with reference to the flowchart of FIG.

[0025] First, the oil pan support jig 10 is placed on the transmission case 200 (see step S1 in FIG. 7). Specifically, an operator grasps the gripping portion 15 and lowers the oil pan support jig 10 in the direction of arrow A shown in FIG. 1, inserting the positioning pins 13a (see FIG. 6) provided on each positioning portion 13 into the knock holes 202 of the transmission case 200, and abutting the mounting surfaces of each mounting portion 14 against predetermined positions on the transmission case 200. This allows the oil pan support jig 10 to be placed in a predetermined position on the transmission case 200, as shown in FIG. 8. Thereafter, a gasket is attached to the fastening hole 201 of the transmission case 200 (step S2).

[0026] Next, the oil pan 100 is supported by the oil pan support jig 10 (step S3). Specifically, as shown by arrow B in FIG. 1 , the oil pan 100 is lowered relative to the oil pan support jig 10 so that the outer peripheral edge of the oil pan 100 is positioned along the inside of the frame portion 11 of the oil pan support jig 10. As a result, as shown in FIG. 3 , the bottom surface of the outer peripheral edge of the oil pan 100 abuts against the spherical portion 12a of each plunger 12 provided on the oil pan support jig 10. As a result, the oil pan support jig 10 supports the oil pan 100 with the oil pan 100 in close proximity to the transmission case 200. In other words, the oil pan support jig 10 supports the oil pan 100 so that the through-hole 101 of the oil pan 100 and the fastening hole 201 of the transmission case 200 face each other with a gap between them. This spacing is smaller than the length of the threaded portion of bolt 50, and is a spacing that allows bolt 50 to be inserted into through hole 101 and fastening hole 201 and held by through hole 101 and fastening hole 201, as shown in Figure 3.

[0027] Then, the bolt 50 is inserted into the through hole 101 and the fastening hole 201 (step S4), whereby the bolt 50 is held between the through hole 101 and the fastening hole 201 that are spaced apart.

[0028] Next, each bolt 50 is temporarily tightened in its corresponding fastening hole 201 (step S5). Specifically, a nut runner tightens the bolt 50 into the fastening hole 201. This tightening operation causes the spherical portion 12a of the plunger 12 to receive a downward force in FIG. 3 via the bolt 50 and the bottom surface of the outer peripheral end of the oil pan 100. This force causes each plunger 12 to move leftward in FIG. 3 against the biasing force of a spring provided inside the plunger 12. This releases the plunger 12 from its support state relative to the oil pan 100, causing the oil pan 100 to descend downward in FIG. 3. This places the through hole 101 and the fastening hole 201 in communication (i.e., the through hole 101 and the fastening hole 201 are in the same positional relationship as in FIG. 9), and the bolt 50 is tightened into the fastening hole 201. In this embodiment, after the bolts 50 are temporarily tightened in all of the fastening holes 201 at once using a nut runner, the bolts 50 are finally tightened in two steps in the fastening holes 201 (step S6). As a result, each bolt 50 is tightened into the fastening holes 201 through the through holes 101, and the oil pan 100 is assembled to the transmission case 200.

[0029] As described above, in this embodiment, by supporting the oil pan 100 using the oil pan support jig 10, the through hole 101 of the oil pan 100 and the fastening holes 201 of the transmission case 200 can be arranged to face each other with a gap between them. By inserting the bolt 50 into the through hole 101 and the fastening hole 201 in this state, the wall surface portion forming the through hole 101 and the wall surface portion forming the fastening hole 201 can hold the bolt 50 at two positions spaced apart in the longitudinal direction, as shown in FIG. 3 . Therefore, the through hole 101 and the fastening hole 201 can hold the bolt 50 without it tipping over, as shown in FIG. 10 . Furthermore, because the inserted bolt 50 is held without tipping over, it is no longer necessary to manually tighten each inserted bolt 50 while holding it so that it does not tip over. This allows all bolts 50 to be pre-tightened (or even fully tightened) using a nut runner. Therefore, the bolt tightening method of this embodiment simplifies and speeds up the operation of tightening bolts into fastening holes in the transmission case.

[0030] In this embodiment, the bolt 50 is tightened temporarily and then tightened in a separate operation, but the bolt 50 may be tightened in a single operation. In this temporary tightening step, the bolt 50 is tightened into the fastening hole 201 to a position where the bolt 50 can at least stand on its own with the through hole 101 and the fastening hole 201 communicating with each other. This prevents the bolt 50 from falling over after the temporary tightening, as shown in FIG. 10.

[0031] Furthermore, in this embodiment, the force generated by the fastening operation of bolt 50 into fastening hole 201 can retract plunger 12 from oil pan 100, thereby releasing the support state of plunger 12 relative to oil pan 100. As a result, the operation of fastening bolt 50 automatically releases the support state of oil pan 100 from oil pan support jig 10, and oil pan 100 can be lowered to a position where through hole 101 communicates with fastening hole 201. Therefore, after inserting bolt 50 into through hole 101 and fastening hole 201, no separate operation is required to release the support state of oil pan 100 from oil pan support jig 10 before fastening bolt 50 into fastening hole 201. Therefore, the operation from supporting oil pan 100 on oil pan support jig 10 to fastening bolt 50 into fastening hole 201 can be simplified and accelerated. In addition, since through holes 101 are provided circumferentially on the outer periphery of oil pan 100, the force applied to transmission case 200 can be more evenly distributed around the circumference of oil pan 100 by the bolt tightening operation.

[0032] Furthermore, by forming the portion of plunger 12 that supports oil pan 100 as spherical portion 12a, the force generated by the bolt tightening operation can move plunger 12 in a direction retracting from oil pan 100. However, plunger 12 may also support oil pan 100 by an inclined surface or the like.

[0033] Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and it goes without saying that various modifications can be made without departing from the spirit of the present invention.

[0034] The number of support portions and abutment portions provided on the work support jig is not limited to the above embodiment, and any number necessary can be arranged. Furthermore, in the above embodiment, the positioning portion 13 equipped with the positioning pin 13a is provided as the abutment portion provided on the work support jig, but it is also possible to provide only an abutment portion that abuts against the second work, such as the placement portion 14.

[0035] In the above embodiment, a plunger is used as an example of a support portion, but the present invention is not limited to this. For example, the support portion may be an elastic member or a leaf spring that is elastically deformable in a direction retracting from the first workpiece due to a force generated by the bolt tightening operation or a predetermined force. [Explanation of symbols]

[0036] 10 Oil pan support jig (workpiece support jig) 11 Frame 12 Plunger (support part) 13 Positioning part (contact part) 14 Placement part (contact part) 100 Oil pan (first work) 101 Through hole 200 Transmission case (second work) 201 Fastening hole

Claims

1. a support portion that supports a first workpiece having a through hole; A work support jig including an abutment portion that abuts against a second work having a fastening hole, The support portion supports the first workpiece so that the through hole and the fastening hole face each other with a gap therebetween, A work support jig characterized in that the support portion releases the support state for the first workpiece by the force that tightens the bolt inserted into the fastening hole through the through hole into the fastening hole.

2. A support portion for supporting a first workpiece having a through hole; A work support jig including an abutment portion that abuts against a second work having a fastening hole, The support portion supports the first workpiece so that the through hole and the fastening hole face each other with a gap therebetween, A workpiece support jig characterized by further comprising a frame portion that holds the support portion and the abutment portion and surrounds the outer periphery of the first workpiece.

3. The workpiece support jig according to claim 2 , wherein the support portion releases the support state for the first workpiece by a force that fastens a bolt inserted into the fastening hole through the through hole into the fastening hole.

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