JP6547590B2 - Connected structure - Google Patents

Description

  The present invention relates to a connecting structure for connecting a transaxle case and a mounting bracket in a vehicle.

  Generally, there is known a vehicle provided with a transaxle having a transmission and a differential gear device in the same case. In some vehicles, the transaxle is connected to the vehicle body via a mounting bracket, for example, and a structure is provided with a reinforcing member to absorb or damp the vibration generated in the power unit comprising the engine and the transaxle. Are known.

  In Patent Document 1, the mounting member is attached to the transaxle case, the transaxle case is fixed to the vehicle body in the engine room through the mounting member, and the transaxle case and the mounting member are connected by the reinforcing member. Technology is disclosed. In this way, it is possible to reduce the vibration that occurs in the power unit, which is composed of, for example, the engine and the transaxle, with the reinforcing member.

JP 2007-253779 A

  However, in the technology of Patent Document 1 above, the transaxle case and the mounting member are connected by a highly rigid reinforcing member in order to suppress the vibration of the power unit of the vehicle. When a load in the direction is input to the reinforcement member, the vertical load flows through the highly rigid reinforcement member to the transaxle case to which the reinforcement member is fastened, and an excessive load is applied to the fastening portion . This causes a problem that the fastening portion of the reinforcing member and the member to which the reinforcing member is fastened, for example, the boss seat on the transaxle case side is damaged. As a countermeasure, a mass damper is placed on the transaxle case side It is necessary to take new measures for inefficient strength. In addition, the input load flows also to the boss seat to which the mass damper is fastened, and eventually the thickness increase of the transaxle case is required. That is, in the case where the vertical load is input, it has become difficult to achieve both strength measures and vibration suppression in the connection structure using the reinforcing member according to the prior art.

  The present invention has been made against the background described above, and an object of the present invention is to provide a connection structure that can achieve both strength measures and vibration suppression.

  The gist of the present invention is a connection structure for connecting a transaxle case and a mount bracket, wherein the connection structure includes a connection member having at least two fastening holes, and the connecting member is the fastening hole. And the connecting member is positioned on a side of the fastening hole located on the transaxle case side among the fastening holes and on the side of the mounting bracket. A low stiffness portion is formed between the fastening hole and the low stiffness portion, and the low stiffness portion is lower in stiffness against a force in the plate thickness direction than a portion other than the low stiffness portion in the connection member.

  In this manner, the connecting member for connecting the transaxle case and the mounting bracket is provided with a low rigidity portion having low rigidity against the force in the plate thickness direction, for example, the vertical load from the vehicle. The low rigidity part absorbs or removes the vertical load from the side, and the stress concentration to the fastening part of the connection member is suppressed, so that the vibration can be suppressed by the connection by the connection member and new strength measures on the transaxle case side Therefore, both strength maintenance and vibration suppression can be achieved.

FIG. 1 is a plan view schematically showing the appearance of a transaxle to which the present invention is applied. FIG. 1 is a perspective view schematically showing a part of the appearance of a transaxle to which the present invention is applied. It is the figure which expanded the mounting bracket shown in FIG. It is the figure which expanded the connection member shown in FIG. 1 thru | or FIG. FIG. 7 is a perspective view schematically showing a connection structure in another embodiment of the present invention. FIG. 7 is a perspective view schematically showing a connection structure in another embodiment of the present invention. FIG. 7 is a perspective view schematically showing a connection structure in another embodiment of the present invention. FIG. 7 is a perspective view schematically showing a connection structure in another embodiment of the present invention.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the following embodiments, the drawings are appropriately simplified or modified, and the dimensional ratios and shapes of the respective parts are not necessarily drawn accurately.

  FIG. 1 is a plan view schematically showing the appearance of a transaxle 10 to which the present invention is applied, and is a view of the transaxle 10 as viewed from directly above (vertically upper side). FIG. 2 is a perspective view schematically showing the main part of a transaxle 10 to which the present invention is applied. As shown in FIG. 1, the transaxle case 12, which is a protective member of the transaxle 10, is one of a housing 12a adjacent to an engine (not shown), a cylindrical case 12b open at both ends in the width direction, and the case 12b. And a cover 12c disposed so as to close the opening of the housing. One transaxle case 12 is configured by mutually fastening end surfaces (matching surfaces) of the case members by bolts (not shown).

  A mount bracket 90 for mounting the transaxle 10 to a vehicle body frame (vehicle member) (not shown) is attached to the cover 12 c of the casing 12. As shown in FIG. 2, the cover 12c is formed with a rectangular mounting fastening surface 92 substantially parallel to the ground or horizontal surface, and the mounting bracket 90 is placed on the mounting fastening surface 92. Are fastened and fixed by bolts 94.

  FIG. 3 is an enlarged view of the mounting bracket 90 shown in FIGS. 1 and 2. As shown in FIG. 3, the mount bracket 90 includes a main body portion 90 a fixed to the cover 12 c and a connecting portion 90 b in which an interference member such as rubber is interposed. The main body portion 90a is formed in a thick plate shape, and a through hole for allowing the bolt 94 to pass therethrough is formed. Then, the male screw portion of the bolt 94 is tightened in a screw hole (not shown) formed in the mount fastening seat surface 92 of the cover 12c. Accordingly, the main body 90a of the mounting bracket 90 is fixed to the mounting fastening surface 92 of the cover 12c by the bolt 94. Further, the connecting portion 90b is connected to another mount bracket fixed to the vehicle body side (not shown), and is internally provided with an interference member such as rubber, and is a vibration generated by the transaxle 10 inputted from the vehicle body Is absorbed or attenuated by the interference member.

  As shown in FIGS. 1 to 3, the cover 12 c and the mounting bracket 90 are connected by a connecting member 100. FIG. 4 is an enlarged view of the connecting member 100 shown in FIGS. 1 to 3. As shown in FIGS. 1 to 4, the connecting member 100 is a pressed product made of a long flat plate material, and the end portions in the longitudinal direction are respectively formed in a substantially semicircular shape having different diameters. Furthermore, in the connecting member 100, fastening holes 102 and 104 are respectively formed at both ends in the longitudinal direction, and the connecting member 100 is bent between the fastening holes 102 and 104 at the longitudinal ends of the connecting member 100. The low rigidity portion 106 is formed by the step formed by

  The fastening hole 102 formed on the substantially semicircular end of the connecting member 100 in the lengthwise direction is opened so that the bolt 94 for fixing the mounting bracket 90 and the cover 12c can be inserted. doing. That is, one end portion of the connecting member 100 is connected together with the mount bracket 90 and the cover 12 c by the bolt 94 inserted into the fastening hole 102. The other end of the connecting member 100 is fastened to the cover 12c by a bolt 108 which is inserted into a fastening hole 104 formed on the other end side of the substantially semicircular shape having a smaller diameter. The low rigidity portion 106 is formed by bending the connecting member 100 in the thickness direction, that is, in the vertical direction between the fastening hole 102 and the fastening hole 104 to provide an oblique step. As shown in FIG. 4, the low rigidity portion 106 is fastened to the cover 12 c and a bent portion 112 formed between the low rigidity portion 106 and the flat plate portion 110 in which the fastening hole 102 to be fastened to the mount bracket 90 is formed. And a bent portion 116 formed between the flat portion 114 in which the hole 104 is formed. The flat plate portion 110 and the flat plate portion 114 are formed at different positions in the vertical direction. When a force in the vertical direction is input, stress is concentrated at the inflection point 112 and the inflection point 116, so the rigidity of the low rigidity portion 106 is lower than, for example, the flat portion 110 or the flat portion 114. . Also, the connecting member 100 is formed so that its overall length is substantially lengthened and its rigidity against the force in the vertical and vertical directions is lower than, for example, a flat connecting member in which the low rigidity portion 106 is not formed. There is.

  As described above, according to the present embodiment, the connecting member 100 connecting the cover 12 c of the casing 12 and the mount bracket 90 has low rigidity with low rigidity in the vertical direction, for example, vertical load from the vehicle. By providing the portion 106, the low rigidity portion cuts the vertical load from the vehicle and the stress concentration to the fastening holes 102 and 104 is suppressed, so that the vibration can be suppressed by the connection and the casing 12 having the cover 12c. Since no new strength measures are required on the side, both strength maintenance and vibration suppression can be achieved.

  Next, another embodiment of the present invention will be described. In the following description, parts common to the embodiments are denoted by the same reference numerals and description thereof is omitted.

  FIG. 5 shows a connection structure fastened to another type of mounting bracket 90. The connection member 120 in the connection structure of the present embodiment is formed of a flat plate material having a substantially triangular shape, and fastening holes 122, 124, 126 are formed at respective protruding ends thereof. The fastening holes 122 and 124 are fastened to the mounting bracket 90, and the fastening holes 126 are fastened to a transaxle case (not shown). Between the fastening hole 124 and the fastening hole 122 and the fastening hole 126, a low rigidity portion 128 is formed which is bent in the thickness direction of the connecting member 120, that is, in the vertical vertical direction to form a step. The low rigidity portion 128 includes a bent portion due to the step. Furthermore, in the connecting member 120, a substantially pentagonal opening 130 is formed between the fastening hole 122, the fastening hole 124, and the fastening hole 126, and a flange 132 is formed on the outer edge of the connecting member 120. By forming the opening 130, a region in which the width dimension in the direction orthogonal to the line connecting the fastening hole 122 and the fastening hole 124 in the connection member 120 is substantially reduced is formed. The flange 132 is formed by bending the outer edge of the outer edge of the connecting member 120 excluding the mount bracket 90 side vertically upward. By forming the flange 132, the rigidity of the connecting member 120 is enhanced. Further, by forming the low rigidity portion 128 and the opening portion 130, stress is concentrated on a bent portion due to the step or a region having a small width dimension due to the opening. It becomes easy to bend, that is, the rigidity against the force in the vertical direction can be lowered. Therefore, by providing the low rigidity portion 128 and the opening portion 130 having low rigidity against the vertical load input from the vehicle, the low rigidity portion 128 and the opening portion 130 receive the vertical load input from the vehicle and the fastening hole Since the concentration of stress in 122 and fastening hole 124 is suppressed, vibration can be suppressed by connection and, for example, no new strength measures are required on the side of the transaxle case (not shown). It can be compatible. In addition, the bolt for fastening of the connection member 120 is abbreviate | omitted in FIG.

  FIG. 6 shows another connection structure for connecting the mounting bracket 90 and the cover 12c. The connecting member 140 in the connecting structure of the present embodiment is formed of a flat plate member having a longitudinal shape, and the fastening hole 142 fastened to the mount bracket 90 and the fastening hole 144 fastened to the cover 12 c Each is formed at the end. Furthermore, in the connecting member 140, the low rigidity portion 146 is locally formed by providing a constriction at one end in the middle in the longitudinal direction between the fastening hole 142 and the fastening hole 144. . By forming the low rigidity portion 146 by the constriction, a region in which the width dimension of the connection member 140 is reduced in the length direction of the connection member 140 is formed, and stress is concentrated in this region to facilitate bending in the vertical direction. That is, the rigidity against the vertical force can be reduced. Further, in the connecting member 140, the other side end portion where the low rigidity portion 146 is not formed is bent vertically upward to form a flange 148. By forming the low rigidity portion 146 and the flange 148, the rigidity of the connection member 140 against the upper and lower forces is reduced, and the rigidity for the forces other than the upper and lower forces is increased. Therefore, by providing the low rigidity portion 146 having low rigidity with respect to the vertical load input from the vehicle, the low rigidity portion 146 eliminates the vertical load input from the vehicle and the stress concentration in the fastening holes 142 and 144 occurs. Since it is suppressed, while being able to suppress vibration by connection, since the new measures for strength are not required on the side of the casing 12 having the cover 12c, it is possible to achieve both strength measures and vibration suppression. Also in FIG. 6, bolts for fastening the connecting member 140 are omitted.

  FIG. 7 shows another connection structure for connecting the mounting bracket 90 and the cover 12c. The connecting member 160 in the connecting structure of the present embodiment is formed of a flat plate member having a longitudinal shape, and the fastening hole 162 fastened to the mount bracket 90 and the fastening hole 164 fastened to the cover 12 c It is provided at each end. Furthermore, low rigidity parts 166 due to necking are locally formed at both ends in the width direction between the fastening hole 162 and the fastening hole 164 in the middle part in the longitudinal direction of the connecting member 160. By forming the low rigidity portion 166 by the constriction, a region in which the width dimension of the connection member 160 is reduced in the length direction of the connection member 160 is formed, and stress is concentrated in this region to facilitate bending in the vertical direction. That is, the rigidity against the vertical vertical force can be reduced. Therefore, since the low rigidity portion 166 eliminates the vertical load input from the vehicle body when the vehicle travels on the uneven road surface, the stress concentration to the fastening holes 162 and 164 is suppressed, so that the vibration can be suppressed by the connection. As no new strength measures are required on the side of the casing 12 having the cover 12c, both strength measures and vibration suppression can be achieved. In addition, the bolt for fastening of the connection member 160 is abbreviate | omitted also in FIG.

  FIG. 8 shows another connection structure fastened to the mounting bracket 90. As shown in FIG. The connecting member 180 in the connecting structure of the present embodiment is made of a flat plate member having an L shape, and the fastening hole 182 fastened to the mount bracket 90 and the fastening hole 184 fastened to a transaxle case (not shown) are longitudinal. It is provided at each end. By forming the connecting member 180 in an L shape, a low rigidity portion 186 which is a point at which the connecting hole 180 and the connecting hole 184 bend substantially at right angles is formed. By forming the low rigidity portion 186, it becomes easy to bend in the vertical direction by concentrating stress on the low rigidity portion 186, that is, the rigidity against the vertical force in the thickness direction of the connecting member 180 is lowered. Can. Therefore, since the low rigidity portion 186 eliminates the vertical load input from the vehicle and the stress concentration in the fastening holes 182 and 184 is suppressed, it is possible to suppress the vibration by the connection and newly measure strength on the transaxle case side. Therefore, both strength maintenance and vibration suppression can be achieved. In addition, the bolt for fastening of the connection member 180 is abbreviate | omitted also in FIG.

  Although the embodiments of the present invention have been described above with reference to the drawings, the present invention can be applied to other aspects. For example, although the number of bolts fastening the connecting members 100, 120, 140, 160, 180 used in the connecting structure of the above-described embodiment is two or three, it is not necessarily limited to this. Any number of bolts may be used to fasten the members.

  Although the above description is merely an embodiment and other examples are not illustrated, the present invention may be embodied in variously modified or improved modes based on the knowledge of those skilled in the art without departing from the spirit of the invention. Can.

12: transaxle case 12c: cover 90: mounting bracket 100, 120, 140, 160, 180: connecting member 102, 104, 122, 124, 126, 142, 144, 162, 164, 182, 184: fastening hole 106, 128, 146, 166, 186: Low rigidity part

Claims (1)

A connecting structure for connecting the transaxle case and the mounting bracket,
The connection structure comprises a connection member having at least two fastening holes,
The connecting member is respectively fastened to the transaxle case and the mount bracket by a fastening bolt inserted into the fastening hole.
The connection member has a low rigidity portion formed between a fastening hole located on the transaxle case side among the fastening holes and a fastening hole located on the mount bracket side.
The connection structure characterized in that the low rigidity portion has low rigidity with respect to a force in a plate thickness direction as compared with a portion other than the low rigidity portion in the connection member.

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