Shim structure

Abstract

To provide a shim structure easily usable for a bearing.SOLUTION: A shim structure 1 includes: an inner shim 11 having an inner shim body 21 having a disc shape and a groove part in an external diameter, and an inner shim lid part 22 provided on an upper surface of the inner shim body 21; and an outer shim 12 having an outer shim body 31 having a disc shape with a through hole 31a in a central portion and having a groove part on a wall surface forming an inner diameter, and an outer shim lid part 32 provided on an upper surface of the outer shim body 31. The outer shim lid part 32 has a projection 32b projecting to above the through hole 31a of the outer shim body 31, and the projection 32b is provided with a plurality of bolt holes 32c penetrating in a vertical direction. The inner shim lid part 22 has a plurality of bolt holes 22b into which one end portion of a bolt 13 inserted into the bolt holes 32c provided in the projection 32b of the outer shim lid part 32 can be inserted.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a shim structure. [Background technology]

[0002] In recent years, automobiles have adopted transaxles that incorporate the transmission and differential gear in the same location and have multiple bearings.

[0003] In addition, an annular shim is used to fill the gap between the outer race and the inner race of each bearing. In other words, by using the annular shim to adjust the thickness, the bearing can be pressurized appropriately and operate normally.

[0004] Patent Document 1 discloses a shim prediction method and device that calculates, by simulation, the thickness of a shim required to apply a predetermined pressure to a bearing. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2005-147223 A Summary of the Invention [Problem to be solved by the invention]

[0006] However, in order to fill the gap between the outer race and the inner race of each bearing used in the transaxle and to properly pressurize the bearing, it is necessary to prepare in advance a number of shims with different thicknesses according to the size of each gap. In this case, it is necessary to prepare more types of shims than are actually necessary, which increases costs.

[0007] The present disclosure provides an easy to use shim structure for bearings. [Means for solving the problem]

[0008] The shim structure disclosed herein comprises an inner shim having an inner shim body that is disk-shaped and has a groove on its outer diameter, and an inner shim cover portion provided on the upper surface of the inner shim body; and an outer shim having an outer shim body that is disk-shaped with a through hole in the center and has a groove on a wall surface that forms the inner diameter, and an outer shim cover portion provided on the upper surface of the outer shim body, wherein the outer shim cover portion has a protrusion that protrudes above the through hole of the outer shim body, and the protrusion is provided with a plurality of bolt holes that penetrate in the vertical direction, and the inner shim cover portion has a plurality of bolt holes into which one end of a bolt inserted into a bolt hole provided in the protrusion of the outer shim cover portion can be inserted. This allows the shim height to be adjusted after assembly. Effect of the Invention

[0009] According to the present disclosure, a shim structure that is easy to use for bearings can be provided. [Brief description of the drawings]

[0010] [Figure 1] FIG. 2 is an exploded perspective view showing the configuration of the shim structure. [Diagram 2] FIG. 4 is an enlarged cross-sectional view of a portion where the inner shim and the outer shim are engaged with each other. [Diagram 3] 1 is a cross-sectional view showing a state in which the shim structure is applied to a housing and a bearing. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] First embodiment Hereinafter, a shim structure (hereinafter, shim 1) according to this embodiment will be described with reference to the drawings. As shown in FIG. 1, the shim 1 includes an inner shim 11, an outer shim 12, and a bolt 13. FIG. 1 is a diagram showing a state in which the components of the shim 1 are disassembled. As shown in FIG. 1, the inner shim 11 and the outer shim 12 are each disk-shaped with a through hole when viewed from above, and for ease of explanation, the thickness direction of the disk is set as the Z direction, and the outer shim 12 is assembled in a state where it is above the inner shim 11. The Z direction is set as the direction in which the rotation axes of the inner shim 11 and the outer shim 12 extend.

[0012] The inner shim 11 includes an inner shim body 21 having a predetermined thickness in the height direction, and an inner shim lid portion 22 disposed on an upper end portion of the inner shim body 21 .

[0013] The disk-shaped inner shim body 21 has a through hole 21a penetrating in the Z direction at the center when viewed from above, and an inner shim groove portion 21b (hereinafter, groove portion 21b) formed in a spiral shape on the wall surface of the outer diameter. The diameter of the inner shim body 21 is approximately the same as the diameter of a through hole 22a provided in the outer shim 12, which will be described later.

[0014] The inner shim lid portion 22 is disk-shaped and disposed at the upper end of the inner shim body 21, and has a through-hole 22a in the center, similar to the inner shim body 21. The inner shim lid portion 22 is formed with a smaller diameter than the inner shim body 21 and a smaller thickness in the Z direction than the inner shim body 21. Typically, the lower surface of the inner shim lid portion 22 is joined to the upper end surface of the inner shim body 21 so as to be integral with it.

[0015] Furthermore, a plurality of bolt holes 22b penetrating in the vertical direction are formed continuously at equal intervals along the outer diameter near the outer diameter of the inner shim cover portion 22. More specifically, when a virtual circle is created with the center of the inner shim cover portion 22 as its center point, the inner shim cover portion 22 has 24 bolt holes 22b aligned on the circumference.

[0016] The inner shim body 21 may have a bolt hole that is open upward so as to match the position of the bolt hole 22b formed in the inner shim cover portion 22. In this case, the bolt hole provided in the inner shim body 21 may penetrate the inner shim body 21 in the Z direction, but it does not have to penetrate to the lower end with only the upper end side of the inner shim body 21 being open.

[0017] The outer shim 12 includes an outer shim body 31 having a predetermined thickness in the height direction, and an outer shim lid portion 32 disposed on an upper end portion of the outer shim body 31 .

[0018] The disk-shaped outer shim body 31 has a through hole 31a penetrating in the Z direction at the center when viewed from above, and an outer shim groove portion 31b (hereinafter, groove portion 31b) formed in a spiral shape on the wall surface of the inner diameter.

[0019] The outer shim lid portion 32 is a disk-shaped portion disposed on the upper end of the outer shim body 31, and has a through-hole 32a in the center, similar to the outer shim body 31. The outer shim lid portion 32 is formed with a smaller thickness in the Z direction than the outer shim body 31.

[0020] Here, the outer shim cover portion 32 is formed so that the diameter of the through hole 32a is shorter than the diameter of the through hole 31a provided in the outer shim body 31. In other words, the outer shim cover portion 32 protrudes slightly on the inner diameter side inward from the wall surface of the inner diameter of the outer shim body 31, i.e., up to above the through hole 31a. The part of the outer shim cover portion 32 that protrudes inward is referred to as protrusion 32b. Note that FIG. 1 shows, as an example, protrusion 32b that protrudes inward from the dashed line up to above the through hole 32a.

[0021] Furthermore, a plurality of bolt holes 32c penetrating in the vertical direction are formed at equal intervals along the inner diameter of the protruding portion 32b of the outer shim cover portion 32. As an example, when a virtual circle is created with the center of the outer shim cover portion 32 as its center point, the outer shim cover portion 32 has four bolt holes 32c aligned on the circumference.

[0022] Here, in the protruding portion 32b of the outer shim cover portion 32, four bolt holes 32c are formed aligned on the circumference of a virtual circle centered at the center of the outer shim cover portion 32. The diameter of this virtual circle is the same as the diameter of a virtual circle according to the arrangement of the bolt holes 22b formed in the inner shim cover portion 22.

[0023] The bolt 13 has a shape that extends in the vertical direction. Here, Fig. 2 is an enlarged cross-sectional view showing a state near a portion where the grooves 21b, 31b mesh when the inner shim 11 and the outer shim 12 are assembled. The bolt 13 is inserted from above the bolt hole 32c provided in the protruding portion 32b of the outer shim lid portion 32, and reaches and is inserted into the bolt hole 22b provided in the inner shim lid portion 22. Typically, as shown in Fig. 2, the bolt 13 is inserted from above the outer shim lid portion 32, and is inserted into the bolt hole provided in the inner shim body 21 through the bolt hole 22b of the inner shim lid portion 22, thereby fixing the inner shim 11 and the outer shim 12 so that they do not rotate relative to each other.

[0024] Here, since the protrusion 32b of the outer shim cover portion 32 protrudes inward from the inner diameter of the outer shim body 31, when the bolt 13 is inserted into the bolt hole 32c, the lower end of the bolt 13 can be inserted into the bolt hole 22b of the inner shim cover portion 22 without getting caught on the outer shim body 31.

[0025] That is, the combination of the inner shim 11 and the outer shim 12 can be performed as follows.

[0026] 2, the groove portion 21b on the outer diameter side of the inner shim body 21 is fitted into the groove portion 31b on the inner diameter side of the outer shim body 31. Here, since each of the groove portions 21b and 31b is a spiral groove, the thickness in the Z direction from the lower end of the inner shim 11 to the upper end of the outer shim 12 can be adjusted by relatively rotating the inner shim 11 and the outer shim 12 around the axis.

[0027] After adjusting the thickness of shim 1 by rotating inner shim 11 and outer shim 12, bolt 13 is inserted into bolt hole 32c of outer shim cover portion 32 from above outer shim cover portion 32, and the lower end of bolt 13 is inserted into bolt hole 22b of inner shim cover portion 22.

[0028] By inserting the bolt 13 into the bolt holes 22b, 32c, the inner shim 11 and the outer shim 12 are fixed so as not to rotate relatively to each other around the axis.

[0029] This makes it possible to fix the inner shim 11 and the outer shim 12 while adjusting their relative positions in the Z direction. Therefore, in situations where shims of various thicknesses are required, it is no longer necessary to prepare multiple types of shims, thereby reducing costs.

[0030] More specifically, groove portion 21b provided on the outer diameter of the inner shim body 21 and groove portion 31b provided on the inner diameter of the outer shim body 31 are each spiral grooves, allowing the thickness of the shim 1 in the Z direction to be finely adjusted.

[0031] Furthermore, here, multiple bolt holes 22b are provided in the inner shim lid portion 22, and the inner shim 11 and the outer shim 12 can be fixed at a position where these bolt holes 22b vertically align with bolt holes 32c of the outer shim lid portion 32. Therefore, strictly speaking, the thickness of the shim 1 in the Z direction can be varied in stages depending on the spiral pitch of the groove portions 21b, 31b of the inner shim body 21 and the outer shim body 31, and the positions of the bolt holes 22b, 32c.

[0032] Although the number of bolt holes 22b provided in the inner shim cover portion 22 has been described as 24, this is not limited to this number. That is, the number of adjustable thickness steps can be increased or decreased depending on the number of bolt holes 22b provided in the inner shim cover portion 22. In addition, the number of bolt holes 32c provided in the outer shim cover portion 32 is not limited to four, and can be changed to any number.

[0033] Since no axial force is generated between the inner shim 11 and the outer shim 12, if they are simply screwed in, they may easily rotate relative to each other, which may cause the thickness of the shim 1 to change during operation. However, by using the bolt 13 to prevent rotation and fixing the relative positions of the inner shim 11 and the outer shim 12, it is possible to prevent relative rotation.

[0034] 3(a) is a diagram showing the meshing of the inner shim 11 and the outer shim 12 when the shim 1 is used in a transaxle, and is a cross-sectional view similar to that of FIG. 2. In this case, a bearing abuts against the inner shim body 21, and a housing abuts against the outer shim body 31.

[0035] This allows the thickness of the shim 1 to be adjusted for the bearings used in the transaxle, thereby preventing problems caused by backlash.

[0036] The present invention is not limited to the above-described embodiment, and can be modified as appropriate without departing from the spirit of the present invention. In other words, the above description has been omitted or simplified as appropriate for the purpose of clarity, and a person skilled in the art can easily modify, add, or convert each element of the embodiment within the scope of the present invention.

[0037] For example, Fig. 3(b) shows an example of a structure in which, in addition to the shim 1 consisting of an inner shim 11 and an outer shim 12, another shim 2 is sandwiched above the outer shim 12, and is a cross-sectional view of the case where it is used in a transaxle, similar to Fig. 3(a). In this case, a pin 14 can be used instead of the bolt 13 that prevents relative rotation between the inner shim 11 and the outer shim 12, and the shim 2 added above the outer shim 12 acts as a lid to prevent the pin from coming loose.

[0038] When used in a transaxle, the shim 1 can be used for each of the three shafts: the differential shaft, the driven shaft, and the motor countershaft. The use of the shim 1 is not limited to transaxles, but can be used widely for assemblies that prevent rattle by changing the thickness of the shim. [Explanation of symbols]

[0039] 1 Shim (shim structure) 11 Inner shim 12 Outer shim 13 Volts 14-pin 21 Inner shim body 21a Through hole 21b Inner shim groove 22 Inner shim cover 22a Through hole 22b Bolt hole 31 Outer shim body 31a Through hole 31b Outer shim groove 32 Outer shim cover 32a through hole 32b Protrusion 32c bolt hole

Claims

[Claim 1] An inner shim body having a disk shape and a groove on an outer diameter thereof; an inner shim having an inner shim lid portion provided on an upper surface of the inner shim body; an outer shim body having a disk shape with a through hole at the center and a groove on a wall surface forming an inner diameter; an outer shim having an outer shim cover portion provided on an upper surface of the outer shim body, the outer shim cover portion has a protruding portion protruding above the through hole of the outer shim body, and the protruding portion is provided with a plurality of bolt holes penetrating in the vertical direction, The inner shim cover portion has a plurality of bolt holes into which one ends of bolts inserted into the bolt holes provided in the protruding portion of the outer shim cover portion can be inserted. Shim structure.

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