Fitting structure for case member

Abstract

To provide a fitting structure for a case member capable of suppressing an increase in the size.SOLUTION: A fitting structure for a case member includes: a first case member; a second case member fitted to a first surface of the first case member; and a third case member fitted to a second surface that is a surface opposite to the first surface of the first case member. The first case member and the third case member are fastened by a fastening member. In an extending direction of the first surface, the second surface and a position to which the fastening member is fitted are located on the inner side of the first surface.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a mounting structure for a case member. [Background technology]

[0002] A case member such as a chain case of an internal combustion engine is attached to a crankcase by bolts (for example, see Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2002-130051 A Summary of the Invention [Problem to be solved by the invention]

[0004] When a plurality of case members are attached, there is a risk that the mounting structure will become large. Therefore, an object of the present invention is to provide a case member mounting structure that can prevent the structure from becoming large. [Means for solving the problem]

[0005] The above object can be achieved by a mounting structure of a case member comprising a first case member, a second case member attached to a first surface of the first case member, and a third case member attached to a second surface opposite the first surface of the first case member, wherein the first case member and the third case member are fastened with a fastening member, and the second surface and the position at which the fastening member is attached in the extension direction of the first surface are located inside the first surface.

[0006] The first case member has a first oil passage, the second case member has a second oil passage, the third case member has a third oil passage, the first oil passage, the second oil passage and the third oil passage form one oil passage, the fastening member is a bolt, a first part of the first case member surrounds a head of the bolt, and the head and the first part of the first case member may be located outside a main flow of the first oil passage.

[0007] A second portion is located on one side of the bolt of the inner wall of the first case member, a third portion is located on the opposite side of the bolt from the second portion of the inner wall, and the main flow path of the first oil passage may be inside a line connecting the second portion and the third portion.

[0008] The engine may further include an oil filter provided upstream of the oil passage, and the fastening member may be located downstream of the oil filter. Effect of the Invention

[0009] It is possible to provide a mounting structure for a case member that can prevent the case member from becoming large. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is a schematic diagram illustrating a mounting structure of a case member according to an embodiment. [Diagram 2] FIG. 2 is an enlarged view of the oil passage. [Diagram 3] FIG. 3 is a cross-sectional view illustrating an example of a mounting structure of a case member according to a comparative example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] The mounting structure of the case member of this embodiment will be described below with reference to the drawings. However, the dimensions and ratios of each part in the drawings may not be illustrated to be completely consistent with the actual ones. Also, some details may be omitted in the drawings.

[0012] 1 is a schematic diagram illustrating a case member mounting structure 100 according to an embodiment. The mounting structure 100 has a case member 10 (first case member), a case member 12 (second case member), and a case member 14 (third case member). Case member 10 and case member 12 are chain cases that house a chain (not shown) therein. Case member 14 is a crankcase of an internal combustion engine.

[0013] Case member 12 is attached to one surface (first surface) of case member 10. Case member 14 is attached to a surface (second surface) of case member 10 opposite to the surface to which case member 12 is attached. The joint surface between case member 10 and case member 12 is referred to as surface 20. The joint surface between case member 10 and case member 14 is referred to as surface 22.

[0014] Case member 12 is fixed to case member 10 by bolts (not shown) or the like. Case member 14 is fixed to case member 10 by bolts 24 (fastening members) or the like. Bolt 24 penetrates face 22 and extends from case member 10 to case member 14.

[0015] The Z-axis direction is parallel to the surface 20 and the surface 22, and is the extension direction of these surfaces. The position of the end of the surface 20 in the Z-axis direction is designated as P, and is indicated by a dashed line in Fig. 1. In the Z-axis direction, the end of the surface 22 and the bolt 24 are located on the inside of the position P. In other words, the position where the surface 22 and the bolt 24 are attached is located on the inside of the surface 20 in the Z-axis direction.

[0016] Bolt 24 is inserted into case member 10 and case member 14. Bolt 24 protrudes from head 25 toward case member 14. Head 25 of bolt 24 is exposed to oil passage 30. Part 40 (first part) of case member 10 surrounds the side surface of head 25.

[0017] An oil passage 30 (first oil passage) is provided inside case member 10. An oil passage 32 (second oil passage) is provided inside case member 12. An oil passage 34 (third oil passage) is provided inside case member 14. Oil passage 30 and oil passage 32 are in communication. Oil passage 30 and oil passage 34 are in communication. Oil passage 30, oil passage 32, and oil passage 34 form one oil passage.

[0018] An oil filter 36 is attached to the case member 12. The oil filter 36 is located upstream of the oil passage and removes foreign matter from the oil. As shown by the arrows in Figure 1, the oil filtered by the oil filter 36 flows in this order through the oil passages 32, 30, and 34, and is supplied to the internal combustion engine, etc.

[0019] Oil passage 32 is defined by the inner wall of case member 12. Oil passage 34 is defined by the inner wall of case member 14. Oil passage 30 is defined by the inner wall of case member 10. Portion 42 (second portion) of the inner wall of case member 10 is located on one side of head 25 of bolt 24. Portion 44 (third portion) of the inner wall is located on the opposite side of head 25 from portion 42. Dotted line L in FIG. 1 is an imaginary line connecting portions 42 and 44.

[0020] 2 is an enlarged view of the oil passage. Oil passage 30 has portion 30a and portion 30b. Portion 30a is located inside dotted line L connecting portion 42 and portion 44 of the inner wall, and is the mainstream of oil passage 30. Portion 30b is located outside dotted line L and is closer to the inner wall than portion 30a. More oil flows into portion 30a than into portion 30b.

[0021] Head 25 of bolt 24 and portion 40 of case member 10 are located on the case member 14 side of dotted line L. That is, head 25 and portion 40 are disposed outside portion 30a, which is the main flow of oil passage 30, and are located in portion 30b.

[0022] 3 is a cross-sectional view illustrating an example of a mounting structure for a case member according to a comparative example. In the Z-axis direction, the end of surface 22 and bolt 24 are located outside position P. Case members 10 and 14 protrude outward beyond case member 12. The mounting structure becomes larger.

[0023] According to the embodiment, surface 22 and the position where bolt 24 is attached are located inside surface 20 in the Z-axis direction. Case members 10 and 14 are placed inside case member 12. Compared to a case where surface 22 and the fastening position of bolt 24 are located outside surface 20, the mounting structure 100 is prevented from becoming large and is made smaller.

[0024] The oil flows through the oil passages 32, 30, and 34 in that order. The oil flows more easily through the center of the oil passage than through the portion closer to the inner wall. The portion 30a of the oil passage 30 is the main portion, and more oil flows through the portion 30a than through the portion 30b.

[0025] Head 25 of bolt 24 and portion 40 of case member 10 are disposed on the side of case member 14 relative to dotted line L connecting portion 42 and portion 44. That is, head 25 and portion 40 are disposed outside portion 30a of oil passage 30, and are located in portion 30b. Since bolt 24 does not protrude to portion 30a of oil passage 30, it is unlikely to collide with oil. Resistance to the oil is unlikely to increase, and a drop in oil pressure is suppressed.

[0026] The bolt 24 is provided downstream of the oil filter 36. The case member 10 and the case member 14 are attached by the bolt 24. The oil filtered by the oil filter 36 flows through the portion fixed by the bolt 24. Oil leakage is suppressed. The deterioration of cleaning performance due to oil is suppressed.

[0027] The case members are not limited to a chain case and a crank case, and the embodiment may be applied to a structure in which one case member has other case members attached to both sides thereof.

[0028] Although a preferred embodiment of the present invention has been described in detail above, the present invention is not limited to such a specific embodiment, and various modifications and variations are possible within the scope of the gist of the present invention described in the claims. [Explanation of symbols]

[0029] 10, 12, 14 case member, 20, 22 surface, 24 bolt, 30, 32, 34 oil passage, 36 oil filter, 30a, 30b, 40, 42, 44 part, 100 mounting structure

Claims

1. A first case member; a second case member attached to a first surface of the first case member; a third case member attached to a second surface of the first case member, the second surface being the surface opposite to the first surface of the first case member; the first case member and the third case member are fastened together by a fastening member, A mounting structure for a case member, wherein the second surface and the fastening member are attached at a position located inside the first surface in an extension direction of the first surface.

2. the first case member has a first oil passage, the second case member has a second oil passage, the third case member has a third oil passage, the first oil passage, the second oil passage, and the third oil passage form one oil passage, the fastening member is a bolt, a first portion of the first case member surrounding a head of the bolt; The case member mounting structure according to claim 1 , wherein the head portion and the first portion of the first case member are positioned outside a main flow of the first oil passage.

3. a second portion is located on one side of the bolt in the inner wall of the first case member, a third portion is located on the inner wall opposite the second portion of the bolt; 3. The mounting structure for a case member according to claim 2, wherein the main flow path of the first oil passage is on the inside of a line connecting the second portion and the third portion.

4. An oil filter is provided upstream of the oil passage, 4. The case member mounting structure according to claim 2, wherein the fastening member is located downstream of the oil filter.

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