Support structure of the transmission

Abstract

To provide a support structure of a transmission which reduces vibration of the transmission and at the same time can restrain a peripheral part from being damaged at vehicle collision.SOLUTION: A support structure of a transmission comprises the transmission and a transmission mount. There is disposed a battery around the transmission mount. The transmission mount includes a mount bracket 120 which is mounted to the transmission. The mount bracket 120 is formed in one piece with a main body part 120a which is mounted to the transmission, mass parts 120b, 120c which are arranged at a rear part and are balances for absorbing vibration and connection parts 120d, 120e which connect the mass parts 120b, 120c with the main body part 120a. The connection parts 120d, 120e include low strength parts 120f, 120g which are relatively lower than other portions of the mount bracket 120 in strength.SELECTED DRAWING: Figure 6

Description

Technical Field

[0001] The present invention relates to a support structure for a transmission, and more particularly to a structure for achieving both vibration reduction of the transmission and damage suppression of peripheral components.

Background Art

[0002] In a vehicle, a dynamic damper or the like may be employed to reduce vibration of a power transmission mechanism (for example, Patent Document 1).

[0003] Patent Document 1 discloses a structure in which a mass (weight for vibration absorption) is attached to an axle case that houses a differential gear for connecting a propeller shaft and a drive shaft. In the structure disclosed in Patent Document 1, the mass is not directly fixed to the axle case, but one end of a long bracket is attached to the axle case, and the mass is attached to the other end spaced apart from the axle case. In Patent Document 1, by adopting the above structure, it is said that vibration of the axle case can be reduced while suppressing the mass of the mass to be small.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] For a vehicle, it is required to ensure safety during a collision. However, in the structure disclosed in Patent Document 1 mentioned above, since the other end of the bracket to which the mass is attached protrudes so as to be separated from the axle case, there is a concern that the other end of the bracket including the mass may come into contact with peripheral components during a collision and damage those peripheral components. For example, in recent electric vehicles and hybrid electric vehicles, a battery may be arranged under the floor panel. However, it is also conceivable that the bracket moves or deforms during a collision and the other end of the mass or the bracket damages the outer case of the battery.

[0006] Note that the problem of damage to peripheral components by the mass during a collision is not limited to the case where the mass is attached to the axle case, but is also a concern when it is attached to the transmission.

[0007] The present invention has been made to solve the above problems, and an object thereof is to provide a transmission support structure that can reduce the vibration of the transmission and suppress damage to peripheral components during a vehicle collision.

Means for Solving the Problems

[0008] A transmission support structure according to an aspect of the present invention includes a transmission and a transmission mount. The transmission is provided in a power transmission path of a vehicle. The transmission mount supports the transmission on the vehicle body. Peripheral components are arranged around the transmission mount.

[0009] In the transmission support structure according to this aspect, the mission mount has a mount bracket attached to the transmission. The mount bracket has a main body portion attached to the transmission, a mass portion that is disposed at a position spaced apart from the main body portion and is a weight for vibration absorption, and a connection portion that connects the main body portion and the mass portion, and the main body portion, the mass portion, and the connection portion are integrally formed. And in the transmission support structure according to this aspect, the connection portion is provided so as to be deformed and broken when the vehicle collides and the mass portion collides with the the peripheral component outer surface of, and has a low-strength portion that is relatively lower in strength than other portions of the mount bracket.

[0010] In the transmission support structure according to the above aspect, since the low-strength portion is provided at the connection portion of the mount bracket, even if the vehicle collides or the mass portion collides with the outer surface of the peripheral components, the low-strength portion is deformed and broken. Therefore, in the transmission support structure according to the above aspect, even if the vehicle collides (including offset collision) and the mount bracket moves toward the peripheral components, damage to the peripheral components caused by the mass portion of the mount bracket can be suppressed.

[0011] In the transmission support structure according to the above aspect, when the mass portion is the first mass portion, the mount bracket further has a second mass portion that is integrally formed with the main body portion and is disposed apart from the first mass portion, and the first mass portion and the second mass portion may be different from each other in at least one of shape and mass.

[0012] In the transmission support structure according to the above aspect, since the first mass portion and the second mass portion, which are different from each other in at least one of shape and mass, are provided on the mount bracket, the vibration frequency that can be reduced by the first mass portion and the vibration frequency that can be reduced by the second mass portion are different. Therefore, in the transmission support structure according to the above aspect, it is possible to reduce the vibration of the transmission in a wide frequency range.

[0013] In the support structure of the transmission according to the above aspect, when the connection part is used as the first connection part and the low-strength part is used as the first low-strength part, the mount bracket is integrally formed with the main body part and the second mass part, and further has a second connection part that connects the main body part and the second mass part. The second connection part may have a second low-strength part that is relatively lower in strength than other parts of the mount bracket excluding the first low-strength part.

[0014] In the support structure of the transmission according to the above aspect, since a second low-strength part with relatively low strength is also provided in the second connection part that connects the main body part and the second mass part, even if the vehicle collides and the mount bracket moves, damage to peripheral components caused by the second mass part can be suppressed.

[0015] In the support structure of the transmission according to the above aspect, the peripheral components may include a case that constitutes the outer shell of the peripheral component, and a guard plate that is a protective member provided outside the case and at a portion facing the mass part.

[0016] As described above, if a guard plate is provided outside the case of the peripheral component, even if the mount bracket moves toward the peripheral component due to a vehicle collision, the guard plate can prevent the mass part from directly colliding with the case. Therefore, in the support structure of the transmission according to the above aspect, it is more effective in suppressing damage to peripheral components caused by the mass part of the mount bracket.

[0017] In the transmission support structure according to the above aspect, the vehicle includes a floor panel having a tunnel portion that bulges toward the vehicle interior and is formed to extend in the vehicle front-rear direction. The transmission is disposed below the tunnel portion. The mount bracket is disposed in a posture in which the mass portion is located rearward in the vehicle front-rear direction with respect to the main body portion. The peripheral components may be fixed to a portion on the lower surface of the floor panel that is rearward of the mass portion in the vehicle front-rear direction and is laterally offset from the tunnel portion in the vehicle width direction.

[0018] In the transmission support structure according to the above aspect, the mount bracket is located diagonally forward of the peripheral components. If the vehicle undergoes an offset collision, the mount bracket will move toward the peripheral components. However, as described above, by the deformation and breakage of the low-strength portion, damage to the peripheral components can be suppressed.

[0019] In the transmission support structure according to the above aspect, an exhaust pipe is provided below the floor panel so as to extend in the vehicle front-rear direction. The exhaust pipe includes a front portion that extends in the vehicle front-rear direction on the lateral side of the transmission in the vehicle width direction, an inclined portion that is continuous with the rear end of the front portion and obliquely extends so as to be located below the tunnel portion behind the vehicle front-rear direction, and an extension portion that is continuous with the rear end of the inclined portion and extends rearward in the vehicle front-rear direction below the tunnel portion. The mass portion may be formed to be located diagonally forward with a space from the inclined portion. the mission mount In the transmission support structure according to the above aspect, since the mass portion is disposed with a space from the inclined portion of the exhaust pipe, the vibration of the mass portion is less likely to be inhibited by the inclined portion of the exhaust pipe. Therefore, in the transmission support structure according to the above aspect, it is possible to reliably reduce the vibration of the transmission while ensuring a high degree of freedom in the layout design of the exhaust pipe.

[0020]

[0021] ​In the support structure of the transmission according to the above aspect, the low-strength portion may be a groove extending in a direction intersecting the connection direction between the main body portion and the mass portion.

[0022] In the support structure of the transmission according to the above aspect, since the low-strength portion is formed by the groove, damage to peripheral components during a vehicle collision can be suppressed while avoiding an increase in mass and the number of parts.

[0023] In the support structure of the transmission according to the above aspect, the peripheral component may be a battery.

[0024] In the support structure of the transmission according to the above aspect, the peripheral component disposed around the mount bracket is a battery. For this reason, it is important to suppress damage to the battery even if the mass portion of the mount bracket collides with the outer surface of the battery. However, as described above, even if the mass portion collides with the outer surface of the battery, damage to the internal structure of the battery can be suppressed by deformation or breakage of the low-strength portion.

Effect of the Invention

[0025] In the support structure of the transmission according to each of the above aspects, vibration of the transmission can be reduced, and damage to peripheral components during a vehicle collision can be suppressed.

Brief Description of the Drawings

[0026]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Mode for Carrying Out the Invention

[0027] Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the embodiments described below are examples of the present invention, and the present invention is not limited to the following embodiments except for its essential configuration.

[0028] In the drawings used in the following description, "Fr" indicates the front of the vehicle, "Re" indicates the rear of the vehicle, "Le" indicates the left side of the vehicle, "Ri" indicates the right side of the vehicle, "Up" indicates the upper side of the vehicle, and "Lo" indicates the lower side of the vehicle, respectively.

[0029] 1. Configuration of Transmission 10 and Its Surroundings The configuration of the transmission 10 and its surroundings according to the embodiment will be described with reference to FIGS. 1 and 2.

[0030] As shown in FIGS. 1 and 2, the vehicle 1 includes a floor panel 1c having a tunnel portion 1a that bulges toward the interior of the vehicle (upward) and is formed to extend in the front-rear direction of the vehicle 1. The tunnel portion 1a is connected to the dash panel 1b at the front.

[0031] Below the tunnel portion 1a, a part of the transmission 10, the propeller shaft 11, and the exhaust pipe 13 are arranged. The transmission 10 is connected to an engine (not shown) in front of the dash panel 1b and is disposed in the tunnel portion 1a in the front-rear direction. As shown in FIGS. 1 and 2, the rear portion of the transmission 10 is supported by the floor panel (vehicle body) 1c via the transmission mount 12.

[0032] The transmission mount 12 includes a mount bracket 120, a rubber mount 121, and a transmission member 122. As shown in FIG. 1, the mount bracket 120 is attached to the transmission 10. As shown in FIG. 2, the transmission member 122 is attached to a portion on the lateral side in the vehicle width direction of the tunnel portion 1b in the floor panel 1c.

[0033] As shown in FIG. 2, batteries (peripheral components) 14 and 15 are fixed to a portion on the lateral side in the vehicle width direction with respect to the portion below the tunnel portion 1a in the floor panel 1c. The battery 14 and the battery 15 are arranged on both sides with the space below the tunnel portion 1a interposed therebetween. And in the front-rear direction of the vehicle 1, the batteries 14 and 15 are arranged behind the transmission 10 and the transmission mount 12.

[0034] The batteries 14 and 15 have cases 14a and 15a that constitute the outer shell. The cases 14a and 15a are made of a light alloy such as an aluminum alloy.

[0035] The exhaust pipe 13 has, in order from the front side in the longitudinal direction of the vehicle 1, a front portion 13a, an inclined portion 13b, and an extension portion 13c. The front portion 13a, the inclined portion 13b, and the extension portion 13c are provided so as to be continuous with each other, and are a path for guiding the exhaust gas discharged from the engine rearward. The front portion 13a is disposed so as to extend in the longitudinal direction to the right of the transmission 10 below the floor panel 1c. The inclined portion 13b is continuous with the rear end of the front portion 13a and is disposed so as to obliquely run toward below the tunnel portion 1a. The extension portion 13c is continuous with the rear end of the inclined portion 13b at a portion rearward of the transmission 10 and the transmission mount 12, and is disposed so as to extend in the longitudinal direction along the propeller shaft 11 below the propeller shaft 11.

[0036] Here, the entire exhaust pipe 13 including the inclined portion 13b is disposed in a non-contact state at an interval with respect to the mount bracket 120 of the transmission mount 12.

[0037] 2. Mounting form of the mount bracket 120 to the transmission 10 and front structure of the batteries 14, 15 The mounting form of the mount bracket 120 to the transmission 10 and the front structure of the batteries 14, 15 will be described with reference to FIGS. 3 and 4.

[0038] As shown in FIG. 3, the mount bracket 120 is attached to the transmission case of the transmission 10 by four screw connections. Specifically, two through holes are formed in the front portion of the mount bracket 120, and bolts BLT are inserted into the through holes and screwed to the transmission case. Also, two through holes are formed in the rear portion of the mount bracket 120, and bolts BLT extending from the transmission case side are inserted, and nuts NT are fastened to the bolts BLT.

[0039] The battery 14 has a guard plate 14b disposed on a part outside the case 14a (the part indicated by the arrow A1). Similarly, the battery 15 has a guard plate 15b disposed on a part outside the case 15a (the part indicated by the arrow A2). As shown in FIG. 4(a), the guard plate 14b is provided so as to cover the outside of the front corner portion 14c in the case 14a. That is, the guard plate 14b is disposed between the front corner portion 14c in the case 14a and the mount bracket 120.

[0040] As shown in FIG. 4(b), the guard plate 15b is provided so as to cover the outside of the front corner portion 15c in the case 15a. That is, the guard plate 15b is disposed between the front corner portion 15c in the case 15a and the mount bracket 120.

[0041] In this embodiment, the guard plates 14b and 15c are formed by bending a steel plate.

[0042] 3. Detailed Configuration of the Transmission Mount 12 The detailed configuration of the transmission mount 12 will be described with reference to FIG. 5.

[0043] As shown in FIG. 5, the transmission mount 12 has a configuration in which a mount bracket 120, a rubber mount 121, and a transmission member 122 are laminated in order from the lower side (the side of the transmission 10). Among these, the detailed structure of the mount bracket 120 will be described later, but it is attached to the transmission member 122 by bolts BLT with the rubber mount 121 interposed therebetween. Note that the bolts BLT (see FIG. 3) extending from the transmission case of the transmission 10 are used for attaching the mount bracket 120 to the transmission member 122.

[0044] The mission member 122 has a base portion 122a integrally formed with arm portions 122b and 122c. The base portion 122a is a plate-like part to which the mount bracket 120 is attached. The arm portion 122b is provided so as to extend obliquely downward to the left from the base portion 122a and is a part fixed to the floor panel 1c using a plurality (three in this embodiment as an example) of bolts BLT. The arm portion 122c is provided so as to extend obliquely downward to the right from the base portion 122a and is a part fixed to the floor panel 1c using a plurality (three in this embodiment as an example) of bolts BLT.

[0045] 4. Detailed Configuration of the Mount Bracket 120 The detailed configuration of the mount bracket 120 will be described with reference to FIG. 6.

[0046] As shown in FIG. 6, the mount bracket 120 has a main body portion 120a integrally formed with mass portions 120b and 120c and connection portions 120d and 120e. The main body portion 120a is a part attached to the transmission 10 and the mission member 122, and six through holes are formed. The mass portion 120b is formed in a state of extending rearward and leftward with respect to the main body portion 120a. The mass portion 120c is in a state of extending rearward and rightward with respect to the main body portion 120a and is formed at a distance in the vehicle width direction (left - right direction) from the mass portion 120b.

[0047] The mass portions 120b and 120c function as weights for absorbing the vibration of the transmission 10. The mass portion 120b has a length L1 in the front - rear direction and a width W1 in the vehicle width direction. The mass portion 120c has a length L2 in the front - rear direction and a width W2 in the vehicle width direction. In this embodiment, the mass portion 120b and the mass portion 120c are formed to have different shapes and different masses from each other as shown in FIG. 6.

[0048] The connecting portion 120d is a portion provided to connect the main body portion 120a and the mass portion 120b, and has a cross-section in a direction intersecting the direction connecting the main body portion 120a and the mass portion 120b formed smaller than that of the mass portion 120b. The connecting portion 120e is a portion provided to connect the main body portion 120a and the mass portion 120c, and has a cross-section in a direction intersecting the direction connecting the main body portion 120a and the mass portion 120c formed smaller than that of the mass portion 120c.

[0049] In the connecting portion 120d, a groove is formed that recesses upward from the lower surface and extends in a direction intersecting the direction connecting the main body portion 120a and the mass portion 120b (the portion indicated by the arrow B1). The groove formed in the connecting portion 120d constitutes a low-strength portion 120f that is relatively lower in strength than other portions of the mount bracket 120.

[0050] Similarly, in the connecting portion 120e, a groove is formed that recesses upward from the lower surface and extends in a direction intersecting the direction connecting the main body portion 120a and the mass portion 120c (the portion indicated by the arrow B2). The groove formed in the connecting portion 120e constitutes a low-strength portion 120g that is relatively lower in strength than other portions (excluding the low-strength portion 120f of the connecting portion 120d) of the mount bracket 120.

[0051] In this embodiment, one of the mass portion 120b and the mass portion 120c corresponds to the "first mass portion", and the other corresponds to the "second mass portion". Also, among the connecting portion 120d and the connecting portion 120e, the one corresponding to the first mass portion corresponds to the "first connecting portion", and the other corresponds to the "second connecting portion". Further, among the low-strength portion 120f and the low-strength portion 120g, the one provided in the first connecting portion corresponds to the "first low-strength portion", and the other corresponds to the "second low-strength portion".

[0052] 5. Deformation and fracture of the mount bracket 120 when the vehicle 1 collides In the support structure of the transmission 10 according to this embodiment, the mission mount 12 including the mount bracket 120 has the above-described configuration, so that the mount bracket 120 is deformed and broken when the vehicle 1 collides (including an offset collision). This will be described with reference to FIG. 7. Note that FIG. 7 shows the state of the mount bracket 120 when the vehicle 1 has an offset collision and receives an impact from the right front diagonally.

[0053] When the vehicle 1 has an offset collision, it is conceivable that the transmission 10 moves diagonally backward to the left from the engine (not shown), the side frame, etc. As shown below in FIG. 3, when the transmission 10 moves diagonally backward to the left, the mount bracket 120 of the mission mount 12 attached to the transmission 10 also moves diagonally backward to the left.

[0054] When the mount bracket 120 moves diagonally backward to the left, the mass portion 120b collides with the guard plate 14b of the battery 14. When the mass portion 120b collides with the guard plate 14b of the battery 14, it deforms starting from the connection portion 120d having a smaller cross section than the mass portion 120b. Since the low-strength portion 120f is provided in the connection portion 120d, it is considered that the deformation occurs in the low-strength portion 120f. And when the collision load of the mount bracket 120 on the guard plate 14b of the battery 14 exceeds a predetermined value, as shown in FIG. 7, the low-strength portion 120f breaks starting from it, and the mass portion 120b detaches from the other parts of the mount bracket 120. Thereby, even when the vehicle 1 collides, damage to the battery 14 which is a peripheral component (such as damage to the electrode body housed in the case 14a) can be prevented.

[0055] Note that in the above, the case where the mount bracket 120 moves diagonally backward to the left and collides with the guard plate 14b due to the offset collision of the vehicle 1 has been described. However, when the mount bracket 120 moves diagonally backward to the right and the mass portion 120c collides with the guard plate 15b of the battery 15, the mount bracket 120 is deformed and broken in the same manner.

[0056] 6. Effects In the support structure of the transmission 10 according to the present embodiment, since the low-strength portions (grooves) 120f and 120g are provided at the connection portions 120d and 120e of the mount bracket 120, even if the vehicle 1 collides (including an offset collision), the mass portions 120b and 120c collide with the guard plates (outer surfaces) 14b and 15b of the battery (peripheral components) 14 and 15, the low-strength portions 120f and 120g are deformed and broken. Therefore, in the support structure of the transmission 10 according to the present embodiment, even if the vehicle 1 collides and the mission mount 12 including the mount bracket 120 moves toward the batteries 14 and 15, damage to the batteries 14 and 15 (damage to the electrode bodies in the cases 14a and 15a, etc.) caused by the mass portions 120b and 120c of the mount bracket 120 can be suppressed.

[0057] In the support structure of the transmission 10 according to the present embodiment, since the mass portions 120b and 120c having different shapes and masses are provided on the mount bracket 120, the vibration frequencies that can be reduced by the mass portion 120b and the vibration frequencies that can be reduced by the mass portion 120c are different. Therefore, in the support structure of the transmission 10 according to the present embodiment, it is possible to reduce the vibration of the transmission 10 in a wide frequency range.

[0058] In the vehicle 1 to which the support structure of the transmission 10 according to the present embodiment is applied, since the guard plates 14b and 15b are provided outside the cases 14a and 15a of the batteries 14 and 15, even if the mount bracket 120 moves toward the battery 14 or the battery 15 due to a collision of the vehicle 1, the guard plates 14b and 15b can prevent the mass portions 120b and 120c from directly colliding with the cases 14a and 15a. Therefore, in the vehicle 1, damage to the batteries 14 and 15 (damage to the electrode bodies in the cases 14a and 15a, etc.) caused by the mass portions 120b and 120c of the mount bracket 120 can be suppressed.

[0059] In the support structure of the transmission 10 according to this embodiment, the mount bracket 120 is located diagonally forward to the right of the battery 14 and diagonally forward to the left of the battery 15. If the vehicle 1 undergoes an offset collision, the mount bracket 120 will move toward the battery 14 or the battery 15. However, as described above, the low-strength portions 120f and 120g are deformed and broken, thereby suppressing damage to the batteries 14 and 15 (such as damage to the electrode bodies in the cases 14a and 15a).

[0060] In the vehicle 1, the mass portion 120c of the mount bracket 120 is arranged at an interval (in a non-contact state) with respect to the inclined portion 13b of the exhaust pipe 13. Therefore, the vibration of the mass portion 120c is hardly inhibited by the inclined portion 13b of the exhaust pipe 13. Thus, in the support structure of the transmission 10 according to this embodiment, while ensuring a high degree of freedom in the layout design of the exhaust pipe 13, the vibration of the transmission 10 can be reliably reduced.

[0061] In the support structure of the transmission 10 according to this embodiment, the low-strength portions 120f and 120g are formed by providing grooves in the connection portions 120d and 120e respectively. Therefore, while avoiding an increase in mass and the number of parts, damage to the batteries 14 and 15 during a collision of the vehicle 1 can be suppressed.

[0062] As described above, in the support structure of the transmission 10 according to this embodiment, the vibration of the transmission 10 can be reduced, and damage to the batteries 14 and 15 during a collision of the vehicle 1 can be suppressed.

[0063] [Modification Example] In the above embodiment, a configuration having two mass portions 120b and 120c in the mount bracket 120 is adopted as an example. However, the number of mass portions provided in the mount bracket 120 may be one, or may be three or more.

[0064] In the above-described embodiment, the mass portions 120b and 120c in the mount bracket 120 are different in both shape and mass from each other. However, the shape and mass of the mass portion 120b and the mass portion 120c can be made the same, or one of the shape and mass can be made different.

[0065] In the above-described embodiment, the low-strength portions 120f and 120g are provided at both of the connection portions 120d and 120e of the mount bracket 120. However, the low-strength portion can be provided only at a portion considered necessary in consideration of the relationship with the arrangement of the peripheral components.

[0066] In the above-described embodiment, the low-strength portions 120f and 120g are formed by providing grooves in the connection portions 120d and 120e of the mount bracket 120. However, a portion having a relatively low strength by narrowing in the cross-sectional direction compared to other portions of the connection portions 120d and 120e may be provided as the low-strength portion.

[0067] In the above-described embodiment, regarding the arrangement of the mount bracket 120, the mass portions 120b and 120c are positioned on the rear side with respect to the main body portion 120a. However, in consideration of the vibration mode of the transmission 10, the relative positions of the mass portions 120b and 120c with respect to the main body portion 120a can be determined. For example, depending on the vibration mode, the mass portions 120b and 120c can be positioned diagonally rearward or laterally with respect to the main body portion 120a.

[0068] In the above-described embodiment, the batteries 14 and 15 are applied as an example of the peripheral components arranged around the mount bracket 120. However, in addition to the batteries, an inverter unit, a fuel pipe, or the like can also be used as the peripheral component.

[0069] In the above-described vehicle 1, the batteries 14 and 15 having the guard plates 14b and 15b are adopted as the peripheral components. However, the guard plates 14b and 15b are not essential components. For example, the impact resistance performance may be improved by thickening the thickness of the portion of the case that is close to and faces the mount bracket 120.

[0070] In the above vehicle 1, as an example, the transmission 10 is arranged in the space below the tunnel portion 1a, but the transmission 10 does not necessarily have to be arranged in the space below the tunnel portion 1a.

[0071] In the above vehicle 1, as an example, the exhaust pipe 13 has an inclined portion 13b, but the exhaust pipe 13 does not necessarily have to have the inclined portion 13b. For example, a form in which the lower part of the floor panel 1c extends straight backward from the side of the transmission 10 can also be adopted.

Explanation of Signs

[0072] 1 Vehicle 1a Tunnel portion 10 Transmission 12 Transmission mount 13 Exhaust pipe 14, 15 Battery (peripheral parts) 120 Mounting bracket 120a Main body portion 120b, 120c Mass portions 120d, 120e Connection portions 120f, 120g Low-strength portions 122 Transmission member

Claims

1. A transmission provided in a power transmission path of a vehicle, a mission mount that supports the transmission to a vehicle body, A support structure for a transmission comprising: Peripheral components are arranged around the mission mount, The mission mount has a mount bracket attached to the transmission, The mount bracket has a main body portion attached to the transmission, a mass portion that is arranged at a position separated from the main body portion and is a weight for vibration absorption, and a connection portion that connects the main body portion and the mass portion, and the main body portion, the mass portion, and the connection portion are integrally formed. The connection portion is provided so as to be deformed and broken when the vehicle collides and the mass portion collides with the outer surface of the peripheral component, and has a low-strength portion having relatively lower strength than other portions of the mount bracket. A support structure for a transmission.

2. In the support structure for a transmission according to Claim 1, When the mass portion is a first mass portion, the mount bracket further has a second mass portion that is integrally formed with the main body portion and is arranged separated from the first mass portion, At least one of the shape and mass of the first mass portion and the second mass portion is different from each other. A support structure for a transmission.

3. In the support structure for a transmission according to Claim 2, When the connection portion is a first connection portion and the low-strength portion is a first low-strength portion, the mount bracket further has a second connection portion that is integrally formed with the main body portion and the second mass portion and connects the main body portion and the second mass portion. The second connecting portion has a second low-strength portion that is relatively lower in strength than other portions of the mounting bracket excluding the first low-strength portion. Support structure for a transmission. **Claim 4** In the support structure for a transmission according to claim 1, The peripheral component includes a case that constitutes an outer shell of the peripheral component, and a guard plate that is a protective member provided outside the case and facing the mass portion. Support structure for a transmission. **Claim 5** In the support structure for a transmission according to any one of claims 1 to 4, The vehicle includes a floor panel having a tunnel portion that bulges toward the interior of the vehicle and is formed to extend in the vehicle front-rear direction. The transmission is disposed below the tunnel portion. The mounting bracket is disposed in a posture in which the mass portion is located rearward in the vehicle front-rear direction with respect to the main body portion. The peripheral component is fixed to a portion on the lower surface of the floor panel that is rearward of the mass portion in the vehicle front-rear direction and is laterally in the vehicle width direction with respect to the tunnel portion. Support structure for a transmission. **Claim 6** In the support structure for a transmission according to claim 5, An exhaust pipe is provided below the floor panel so as to extend in the vehicle front-rear direction. The exhaust pipe has a front portion that extends in the vehicle front-rear direction laterally of the transmission, an inclined portion that is continuous with the rear end of the front portion and obliquely extends so as to be located below the tunnel portion behind the transmission mount in the vehicle front-rear direction, and an extension portion that is continuous with the rear end of the inclined portion and extends rearward in the vehicle front-rear direction below the tunnel portion. The mass portion is formed to be located obliquely forward at an interval from the inclined portion. Transmission support structure.

7. In the transmission support structure according to any one of Claims 1 to 6, the low-strength portion is a groove extending in a direction intersecting the connection direction between the main body portion and the mass portion, Transmission support structure.

8. In the transmission support structure according to any one of Claims 1 to 7, the peripheral component is a battery, Transmission support structure.

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