JP2022134706A - Power device fitting structure in vehicle - Google Patents

Abstract

To suppress application of a large external force to a motor and improve durability of the motor.SOLUTION: A fitting structure of a power device 44 to a vehicle body includes: a motor 46; and a transmission 48 that is connected to the motor 46 and transmits power by the motor 46 to wheels 16. The fitting structure includes a front support 40 that supports a front part of the transmission 48 to vehicle structure members 20, 32, 34, 70. The front support 70 includes a lower end 78B extending to a lower portion than the lowest end of the motor 46, and a connection piece 80.SELECTED DRAWING: Figure 5

Description

TECHNICAL FIELD The present invention relates to a mounting structure for a power plant in a vehicle, and more particularly to a structure for mounting an electric power plant to a vehicle body.

BACKGROUND ART An electric vehicle is known in which a wheel-driving electric motor and a speed reducer are arranged between left and right side members extending in the front-rear direction of the vehicle (for example, Patent Document 1).

JP 2015-89806 A

In a vehicle equipped with an electric motor for driving the wheels, it is useful to improve the durability of the electric motor to prevent a large external force from being applied to the electric motor due to collision with flying objects such as flying stones while the vehicle is running. be.

The problem to be solved by the present invention is to suppress the input of a large external force to the electric motor and improve the durability of the electric motor.

A power plant mounting structure according to one embodiment of the present invention includes an electric motor (46) in a vehicle (10) and a transmission device ( 48), comprising a first support portion (40) for supporting a front portion of the transmission device to a structural member (20, 32, 34, 70) of the vehicle; The first support includes portions (78, 80) extending below the lowest end of the motor.

According to this configuration, flying objects such as flying stones are less likely to collide with the electric motor, input of a large external force to the electric motor is suppressed, and the durability of the electric motor is improved.

In the above power plant mounting structure, preferably, the first support portion includes an extension portion (80) to which the transmission device is fixed and which extends in the left-right direction with respect to the traveling direction of the vehicle, and the extension portion comprises: The length of the extending portion in the left-right direction is longer than the length of the electric motor or the transmission device in the left-right direction. is formed in

According to this configuration, flying objects such as flying stones are less likely to collide with the electric motor or the transmission device, input of a large external force to the electric motor or the transmission device is suppressed, and the durability of the electric motor or the transmission device is improved.

In the mounting structure of the power unit, preferably, the first support portion includes a pair of support pieces (78) extending substantially vertically along the left and right sides of the transmission device, each of the support pieces It has an upper end (78A) connected to a structural member and a lower end (78B) connected to the transmission at a position lower than the lowest end of the motor.

According to this configuration, the support piece makes it difficult for flying objects such as flying stones to collide with the electric motor, suppresses input of a large external force to the electric motor, and improves the durability of the electric motor.

In the mounting structure of the power unit, preferably, the first support portion includes a connecting piece (80) that connects the lower end portions of the left and right support pieces to each other.

According to this configuration, the mechanical strength of the first support portion is improved.

In the mounting structure of the power unit, preferably, the lower end portion of the support piece is coupled to a front lower portion of the transmission device, and the connecting piece extends in the left-right direction in front of the lower portion of the transmission device.

According to this configuration, the strength of the first support portion is improved, and the connecting piece also acts as a protective portion for the electric motor against flying objects such as flying stones.

In the mounting structure of the power unit, preferably, the connecting portion between the lower end portion of the support piece and the left and right end portions of the connecting piece is inclined upward from the inside to the outside.

According to this configuration, the contour of the first support portion is compact, and flying stones and flying objects are less likely to hit it.

In the mounting structure for the power unit, preferably, the upper end of the support piece is coupled to the structural member via a pivotal support (86).

According to this configuration, transmission of vibration between the structural member and the support piece is suppressed, and the power plant is less likely to vibrate.

In the power plant mounting structure, preferably, the pivotal support includes a vibration damping section (84).

According to this configuration, the transmission of vibration between the structural member and the support piece is effectively suppressed, and the power plant is less likely to vibrate.

In the mounting structure of the power unit, preferably, the structural member includes a support bracket (70) extending vertically at left and right positions of the electric motor, and the pivot portion is provided at the lower end of the support bracket.

According to this configuration, the degree of freedom in arranging the pivot portion is large, and the degree of freedom in design is increased.

In the mounting structure of the power unit, preferably, the electric motor is coupled to a front side and upper position of the transmission device and supported by the structural member via the transmission device.

This configuration eliminates the need for a mounting portion for the electric motor to the structural member, and simplifies the mounting structure of the power unit.

In the mounting structure of the power plant, preferably, the power plant includes an endless transmission body (64) that transmits power between the electric motor and the transmission device, and the electric motor changes its position relative to the transmission device. fixed as possible.

According to this configuration, the degree of tension of the endless transmission can be adjusted by changing the relative position of the electric motor with respect to the transmission device.

In the mounting structure of the power unit, preferably, the first support portion is located on the front side or the rear side of the vehicle with respect to the transmission device, and the transmission device is positioned opposite the front and rear of the vehicle from the first support portion. At its side, it has a second support (42) for supporting against said structural member.

According to this configuration, the mounting strength of the power unit to the structural member is improved.

The mounting structure of the power unit preferably includes a cover portion extending from the portion of the structural member in front of the electric motor to the vicinity of the first support portion and covering the lower surface of the electric motor.

According to this configuration, flying objects such as flying stones are more unlikely to collide with the electric motor, and the suppression of inputting a large external force to the electric motor is enhanced.

In the power plant mounting structure described above, preferably, the cover portion is arranged such that the lowermost end thereof is positioned higher than the lowermost end of the first support portion.

According to this configuration, flying objects such as flying stones are less likely to hit the cover portion than the first support portion, and the cover portion can be configured with a lower strength than the first support portion.

According to the mounting structure of the power plant according to the present invention, flying objects such as flying stones are less likely to collide with the electric motor, the input of a large external force to the electric motor is suppressed, and the durability of the electric motor is improved.

1 is a perspective view showing one embodiment of a vehicle to which a power plant mounting structure according to the present invention is applied; FIG. 1 is a side view showing an embodiment of a power plant mounting structure according to the present invention; The rear view of the mounting structure of the power plant according to the same embodiment. The top view of the mounting structure of the power plant by the same embodiment. The perspective view seen from the back of the mounting structure of the power plant according to the same embodiment. The perspective view seen from the front of the mounting structure of the power plant according to the same embodiment.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which a power plant mounting structure according to the present invention is applied to an electric vehicle will be described below with reference to FIGS.

An electric vehicle (vehicle) 10 has a vehicle body 12, a central front wheel 14, and left and right rear wheels 16. An electric motor (not shown) mounted on the vehicle body 12 drives the rear wheels 16 to rotate. An electric vehicle 10 is shown.

As shown in FIGS. 2 to 6, the vehicle body 12 includes, as structural members, left and right side members 20 extending substantially parallel to each other in the front-rear direction, and left and right side members 20 extending in the left-right direction. A rear end connecting member 24 that connects the rear ends of the members 20 to each other via a connecting member 22, and a second connecting member 24 that extends in the left-right direction and connects the vicinity of the rear ends of the left and right side members 20 to each other via a connecting member 28. 1 intermediate connecting member 30, a second intermediate connecting member 32 that extends in the left-right direction and connects the left and right side members 20 to each other in front of the first intermediate connecting member 30, and a second intermediate connecting member 32 that extends in the left-right direction. and a third intermediate connecting member 34 that connects the left and right side members 20 to each other in front of the intermediate connecting member 32 .

A power unit 44 is attached to the first intermediate connecting member 30 , the second intermediate connecting member 32 and the third intermediate connecting member 34 by a front side support portion (first support portion) 40 and a rear side support portion (second support portion) 42 . It is

The power unit 44 includes an electric motor 46 and a transmission device 48 that is connected to the electric motor 46 and that transmits the power of the electric motor 46 to the rear wheels 16 .

The transmission device 48 as a whole is generally located in the central portion in the left-right direction (vehicle width direction). The electric motor 46 has a substantially circular box-shaped case 47 connected to a substantially oval box-shaped case 49 of the transmission device 48 by bolts 52 at a front side and upper position. A case 49 of the transmission device 48 extends vertically in a forward tilted posture and includes a portion positioned below the case 49 of the electric motor 46 . As a result, the electric motor 46 as a whole is located on the front side of the transmission device 48 above the lower end of the transmission device 48 .

An output shaft 56 of the electric motor 46 includes a portion that protrudes outward to the right from approximately the center of the case 49 . A drive pulley 58 is attached to the projecting portion of the output shaft 56 . The transmission device 48 incorporates a gear train (not shown) inside a case 49 . The input shaft 60 of the gear train includes a portion that protrudes outward from the upper portion of the case 49 to the right. A driven pulley 62 is attached to the projection of the input shaft 60 . A flexible belt-like endless transmission member 64 is stretched between the drive pulley 58 and the driven pulley 62 . The endless transmission body 64 performs power transmission between the electric motor 46 and the transmission device 48 . On both left and right sides of the lower portion of the case 49, the aforementioned gear train output portions 66 are provided. An axle (not shown) for driving the rear wheels 18 is connected to the output portion 66 .

The case 47 of the electric motor 46 is attached to the case 49 of the transmission device 48 at one point by bolts 52 , the bolts 52 being offset radially outwardly of the output shaft 56 . As a result, the case 47 is pivotally displaced with respect to the case 49 about the bolts 52 , and the electric motor 46 is fixed by the bolts 52 such that the relative position to the transmission device 48 can be changed. By changing this relative position, the inter-shaft distance between the output shaft 56 of the electric motor 46 and the input shaft 60 of the transmission device 48 changes, and the tension of the endless transmission member 64 is adjusted.

The vehicle body 12 further includes, as structural members, left and right support brackets 70 suspended from the second intermediate connection member 32 and the third intermediate connection member 34 and extending vertically at left and right positions of the electric motor 46 respectively.

Each support bracket 70 includes a pair of left and right leg pieces 72 that are substantially V-shaped when viewed from the side, and a coupling piece 74 that joins the upper ends of the left and right leg pieces 72 to each other and extends in the front-rear direction. Each support bracket 70 has a connecting piece 74 whose front end is connected to the third intermediate connecting member 34 and whose connecting piece 74 is connected to the second intermediate connecting member 32 at its rear end.

A transmission device 48 is attached to the left and right support brackets 70 by a front support member 76 forming a main part of the front support section 40 . The front support member 76 includes a pair of left and right support pieces 78 extending substantially vertically along the left and right sides of the case 49 of the transmission device 48 and a connecting piece 80 connecting the lower ends of the left and right support pieces 78 to each other. This structure improves the mechanical strength of the front support member 76 .

The upper ends 78A of the left and right support pieces 78 are pivotally supported by bolts 82 on the lower ends of the corresponding support brackets 70 via vibration damping members 84, such as elastic bushes, about a horizontal axis extending in the left-right direction. . That is, the upper ends of the left and right support pieces 78 are coupled to the corresponding support brackets 70 via pivots 86 including bolts 82 and vibration damping members 84 . The horizontal axis of the left and right pivots 86 (the central axis of the bolt 82) is coaxial.

A pivot 86 containing a vibration damping member 84 inhibits the transmission of vibrations between the support bracket 70 and the support lug 78 . As a result, the power plant 44 is less likely to vibrate, and the durability of the power plant 44 is improved.

Each support piece 78 extends obliquely rearward and downward from the pivotal support portion 86 with the support bracket 70 and includes a portion that extends to a position lower than the lowest end of the case 47 of the electric motor 46 . A lower end portion 78B of each support piece 78 is connected to the front lower portion of the case 49 of the transmission device 48 by a bolt 88. As shown in FIG.

That is, the left and right support pieces 78 extend substantially vertically along the left and right sides of the transmission device 48, and have upper ends coupled to the support brackets 70 and lower ends coupled to the case 49 of the transmission device 48, respectively. have. The support bracket 70 increases the degree of freedom in the placement of the pivot 86 and increases the degree of freedom in design.

Since each support piece 78 includes a portion extending to a position lower than the lowermost end of the case 47 of the electric motor 46, the case 47 of the electric motor 46 is less likely to be hit by flying stones or flying objects from below, and external force to the electric motor 46 is prevented. input can be reduced. As a result, the electric motor 46 is protected against external forces, and the electric motor 46 is less likely to be damaged. The left and right support brackets 70 act as protective members that make it difficult for the case 47 of the electric motor 46 to hit against flying stones and flying objects from the left and right outside.

The connecting piece 80 is an extending portion extending in the left-right direction with respect to the traveling direction of the three-wheeled electric vehicle 10, and is arranged below the downward facing surface of the electric motor 46 or the transmission device 48, and extends in the left-right direction. is longer than the length of the electric motor 46 or the transmission device 48 in the left-right direction. In other words, the connecting piece 80 extends laterally in front of the lower portion of the case 49 of the transmission device 48 and acts as a member that protects the transmission device 48 from flying stones and the like from the front of the transmission device 48 . As shown in FIG. 3, the connection between the lower ends of the left and right support pieces 78 and the left and right ends of the connection piece 80 is inclined upward from the inside to the outside in a front view. Therefore, the outline of the front side support member 76 is compact, and flying stones and flying objects hardly hit it.

A cover member 92 is arranged below the electric motor 46 . The cover member 92 has a bottom plate portion 94 , left and right side plate portions 96 rising from the left and right edges of the bottom plate portion 94 , and a front plate portion 97 rising from the front edge portion of the bottom plate portion 94 . The rear portions of the left and right side plate portions 96 are fixed to the outer leg pieces 72 of the corresponding support brackets 70 by bolts 98 . As a result, the cover member 92 extends from the third intermediate connecting member 34 in front of the electric motor 46 to the vicinity of the support piece 78 and covers the lower surface of the electric motor 46 . The cover member 92 is arranged such that a bottom plate portion 94 forming the lowest end thereof is located at a position higher than the lowest ends of the support pieces 78 .

The covering lid member 92 makes it more difficult for flying objects such as flying stones to collide with the electric motor 46 , and further suppresses the input of a large external force to the electric motor 46 . Since the cover member 92 is arranged so that the bottom plate portion 94 forming the lowest end thereof is located at a position higher than the lowermost ends of the support pieces 78 , the cover member 92 is more resistant to flying objects such as flying stones than the support pieces 78 . The cover member 92 can be made of a material having a lower strength than the support piece 78 .

The rear support portion 42 includes a rear support member 102 whose upper and lower ends are coupled to two upper and lower portions of the rear portion of the case 49 of the transmission device 48 with bolts 100 . The rear support members 102 are provided on both left and right sides of the case 49, respectively. A fixing member 106 is fixed by a bolt 104 to substantially the central portion of the first intermediate connecting member 30 in the left-right direction. The rear support member 102 is coupled at its intermediate portion to a fixed member 106 by bolts 108 via a vibration damping member 110 such as an elastic bush. In other words, the rear support portion 42 pivots the transmission device 48 from the first intermediate coupling member 30 by the rear support member 102 about a horizontal axis extending in the left-right direction.

As a result, the transmission device 48 is supported on both front and rear sides by the first intermediate connecting member 30, the second intermediate connecting member 32, and the third intermediate connecting member 34, and the electric motor 46 is supported by the first intermediate connecting member via the transmission device 48. 30 , a second intermediate connecting member 32 and a third intermediate connecting member 34 .

The vibration damping member 110 suppresses transmission of vibration between the first intermediate connecting member 30 and the rear support member 102 . This makes it difficult for the power plant 44 to vibrate, and improves the durability of the power plant 44 .

Although the present invention has been described in terms of its preferred embodiments, it should be readily apparent to those skilled in the art that the present invention is not limited to such embodiments and that departures from the spirit of the invention are not intended to be construed as limiting the scope of the invention. It can be changed appropriately as long as it does not occur. For example, the front support part 40 and the rear support part 42 may be reversed when viewed in the front-rear direction of the vehicle body 12 . Moreover, all of the components shown in the above embodiments are not necessarily essential, and can be appropriately selected without departing from the gist of the present invention.

10: three-wheeled electric vehicle 12: vehicle body 14: front wheel 16: rear wheel 18: rear wheel 20: side member 22: connecting member 24: rear end connecting member 28: connecting member 30: first intermediate connecting member 32: second intermediate Connecting member 34 : Third intermediate connecting member 40 : Front support portion (first support portion)
42: rear side support (second support)
44 : Power unit 46 : Electric motor 47 : Case 48 : Transmission device 49 : Case 52 : Bolt 56 : Output shaft 58 : Drive pulley 60 : Input shaft 62 : Driven pulley 64 : Endless transmission element 66 : Output part 70 : Support bracket 72 : Leg piece 74 : Joint piece 76 : Front side support member 78 : Support piece 78A : Upper end portion 78B : Lower end portion 80 : Connection piece (extending portion)
82 : bolt 84 : vibration damping member 86 : pivot 88 : bolt 92 : cover member 94 : bottom plate 96 : side plate 98 : bolt 100 : bolt 102 : rear support member 104 : bolt 106 : fixing member 108 : bolt 110 ：Vibration damping material

Claims (14)

A mounting structure for a power unit in a vehicle including an electric motor and a transmission device connected to the electric motor for transmitting power of the electric motor to wheels of the vehicle,
a first support supporting the transmission device to a structural member of the vehicle;
The mounting structure of a power plant, wherein the first support portion includes a portion extending to a position lower than the lowest end of the electric motor. The first support portion includes an extension portion to which the transmission device is fixed and which extends in the left-right direction with respect to the traveling direction of the vehicle, and the extension portion is located below the downward facing surface of the electric motor or the transmission device. 2. The mounting of the power unit according to claim 1, wherein the extending portion is arranged on the side and formed so that the length of the extending portion in the left-right direction is longer than the length of the electric motor or the transmission device in the left-right direction. structure. The first support portion includes a pair of support pieces extending substantially vertically along the left and right sides of the transmission device, and each of the support pieces has an upper end coupled to the structural member and a lowermost end of the electric motor. 2. The mounting structure for a power plant according to claim 1, further comprising a lower end connected to said transmission device at a position lower than said lower end. 4. The mounting structure of a power plant according to claim 3, wherein the first support portion includes a connecting piece that connects the lower end portions of the left and right support pieces to each other. 5. The power unit mounting structure according to claim 4, wherein said lower end portion of said support piece is coupled to a front lower portion of said transmission device, and said connecting piece extends in a left-right direction in front of a lower portion of said transmission device. 6. The mounting structure of a power unit according to claim 4, wherein the connecting portion between the lower end portion of the support piece and the left and right end portions of the connecting piece is inclined upward from the inside to the outside. 7. The mounting structure for a power plant according to claim 3, wherein said upper end portion of said support piece is coupled to said structural member via a pivot portion. 8. The mounting structure of a power plant according to claim 7, wherein said pivotal support includes a vibration damping portion. 9. The mounting structure of a power plant according to claim 7, wherein said structural member includes a support bracket extending vertically at left and right positions of said electric motor, and said pivotal support portion is provided at a lower end of said support bracket. 10. The mounting structure of a power plant according to claim 1, wherein the electric motor is coupled to a position in front of and above the transmission device and supported by the structural member via the transmission device. 11. The power unit according to claim 10, wherein the power unit includes an endless transmission body that transmits power between the electric motor and the transmission device, and the electric motor is fixed so as to be able to change its relative position with respect to the transmission device. mounting structure. the first support is on the vehicle front side or rear side of the transmission device;
5. The transmission device according to any one of claims 1 to 4, further comprising a second support portion that supports the transmission device with respect to the structural member on a front-to-rear side of the vehicle opposite to the first support portion. power unit mounting structure. 13. The power plant mounting structure according to any one of claims 1 to 12, further comprising a cover portion extending from a portion of the structural member in front of the electric motor to a vicinity of the front support portion and covering a lower surface of the electric motor. 14. The mounting structure of the power plant according to claim 13, wherein the cover portion is arranged such that the lowermost end thereof is located at a position higher than the lowermost end of the front support portion.

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