JP2020051527A - Power unit mount structure - Google Patents

Abstract

To provide a power unit mount structure which can make vibration control measures of an engine and restrict movement of the engine.SOLUTION: A power unit mount 20 of the invention includes: a body part 21 attached to the power unit 12 side; and a vehicle body side mount 22 attached to the vehicle body side. The power unit mount 20 has: a mount case 23; a contact part 24 which is formed continuing into the mount case 23; and a liquid sealing part 26 which is a cavity formed at an interior of the mount case 23 and in which a liquid for damping an impact is enclosed. The vehicle body side mount 22 has a displacement restriction part 27 which contacts with the contact part 24 to restrict movement of the body part 21. The body part 21 further has a variable stopper 30 which can vary a width of a gap between the vehicle body side mount 22 and the displacement restriction part 27.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a power unit mounting structure, and more particularly to a power unit mounting structure for elastically mounting a power unit including an engine on a vehicle body.

  2. Description of the Related Art In vehicles such as automobiles, in order to fix an engine to a vehicle body, an engine mount structure for restricting and damping the movement of the engine within a predetermined range is employed.

  For example, in Patent Literature 1, a stopper unit integrally formed with an inner cylinder and an outer cylinder is disposed between an inner cylinder and an outer cylinder with a rubber elastic body interposed therebetween, and a contact surface of the stopper structure is axially parallel contacted. An engine mount structure that restricts excessive relative displacement in a direction orthogonal to the axial direction by using a contact surface is described.

  Patent Literature 2 discloses that a rubber portion having an inner cylinder vulcanized and bonded is formed by a bracket which is press-fitted with a rubber bush having an outer cylinder integrated therein and forms a mounting portion to a vehicle body side. An engine mount structure in which the constituent parts are made of lightweight resin is described.

  Patent Document 3 discloses that an engine-side mount is formed by integrally forming a cushion body and a bracket portion having a stopper and a bracket fixed to the engine, a stopper receiver for receiving the stopper, and fixed to the vehicle body. Describes an engine mount structure constituting a vehicle body side mount to be mounted.

JP-A-3-168425 JP-A-6-69470 JP-A-2000-2298

  However, in the engine mount structure according to the background art described above, it is not easy to suppress a large displacement of the engine while suppressing the transmission of the engine vibration to the vehicle body.

  Specifically, particularly with reference to Patent Document 3, it has been difficult to appropriately set the separation distance between the bracket portion connected to the engine and the stopper receiver connected to the vehicle body. That is, the upper portion of the bracket portion is made of a hard material, and the lower portion of the bracket portion is made of a soft material. However, when a softer material is used as the lower portion of the bracket portion, vibration from the engine is effectively removed by the bracket portion. Can be absorbed. However, in this case, in order to prevent interference between the bracket portion and the stopper receiver, it is necessary to increase the distance between the bracket portion and the stopper receiver. However, in such a case, the displacement of the engine cannot be effectively suppressed, There has been a problem that the response characteristics of the vehicle body during cornering are reduced.

  On the other hand, if the distance between the bracket and the stopper receiver is reduced for the purpose of improving the response characteristics of the vehicle body, the bracket and the stopper receiver become unnecessary when the vehicle is traveling on a flat road or idling. As a result, much of the vibration of the engine is transmitted to the vehicle body, and the comfort of the occupant is impaired.

  The present invention has been made in view of such problems, and an object of the present invention is to provide a power unit mount structure capable of achieving both a high level of engine vibration isolation measures and engine movement regulation. It is in.

  The power unit mounting structure of the present invention includes a main body attached to a power unit side and a vehicle body side attaching part attached to a vehicle body, wherein the main body is formed continuously with a mount case and the mount case. A contact portion, and a liquid filling portion that is a cavity formed inside the mount case and is filled with a liquid for damping shock, and the vehicle-body-side mounting portion is provided in the contact portion. A liquid pressure supply unit formed inside the contact portion in communication with the liquid sealing portion, the displacement control portion having a displacement restricting portion that regulates the movement of the main body portion by contacting; The width of a gap formed between the abutting portion of the main body and the displacement restricting portion of the vehicle body-side mounting portion can be changed by moving forward and backward in accordance with the hydraulic pressure acting on the hydraulic pressure supply portion. And a variable stopper, That.

  Further, in the power unit mount structure of the present invention, the contact portion protrudes laterally from the mount case, and the displacement restricting portion is formed at a position facing the contact portion from above. I do.

  Further, in the power unit mounting structure of the present invention, a first sealing means for sealing the liquid is provided at a portion where the variable stopper and the mounting case slide.

  Further, in the power unit mount structure of the present invention, a second sealing means for sealing the liquid is provided between an end of the liquid pressure supply unit and the variable stopper.

  Further, in the power unit mount structure according to the present invention, the variable stopper comes into contact with the displacement restricting portion in a protruding state.

  The power unit mounting structure of the present invention includes a main body attached to a power unit side and a vehicle body side attaching part attached to a vehicle body, wherein the main body is formed continuously with a mount case and the mount case. A contact portion, and a liquid filling portion that is a cavity formed inside the mount case and is filled with a liquid for damping shock, and the vehicle-body-side mounting portion is provided in the contact portion. A liquid pressure supply unit formed inside the contact portion in communication with the liquid sealing portion, the displacement control portion having a displacement restricting portion that regulates the movement of the main body portion by contacting; The width of a gap formed between the abutting portion of the main body and the displacement restricting portion of the vehicle body-side mounting portion can be changed by moving forward and backward in accordance with the hydraulic pressure acting on the hydraulic pressure supply portion. And a variable stopper, That. Thus, according to the power unit mount structure of the present invention, the variable stopper makes the width of the gap between the contact portion of the main body and the displacement restricting portion of the vehicle body-side mounting portion variable according to the input load. Therefore, when the load input to the power unit mount is small at the time of idling or the like, the amount of protrusion of the variable stopper is small, and a large gap between the contact portion and the displacement regulating portion is secured. Therefore, the vibration generated by operating the power unit is absorbed by the mount case, and transmission of the vibration to the vehicle body via the contact portion and the displacement restricting portion can be suppressed. On the other hand, when a large input is applied to the power unit such as when the vehicle rides on a step, a large hydraulic pressure is applied to the hydraulic pressure supply unit, and accordingly, the variable stopper is pushed out, and the contact part and the displacement restriction part are pushed out. Gap becomes smaller. Therefore, unnecessary contact of the power unit can be suppressed and the vehicle body can be prevented from swaying due to easy contact between the contact portion and the displacement restricting portion.

  Further, in the power unit mount structure of the present invention, the contact portion protrudes laterally from the mount case, and the displacement restricting portion is formed at a position facing the contact portion from above. I do. Thus, according to the power unit mount structure of the present invention, the effect of suppressing a large displacement of the power unit mount can be remarkable.

  Further, in the power unit mounting structure of the present invention, a first sealing means for sealing the liquid is provided at a portion where the variable stopper and the mounting case slide. Thus, according to the power unit mount structure of the present invention, it is possible to prevent the liquid from flowing out of the portion where the variable stopper slides on the mount case.

  Further, in the power unit mount structure of the present invention, a second sealing means for sealing the liquid is provided between an end of the liquid pressure supply unit and the variable stopper. Thus, according to the power unit mount structure of the present invention, it is possible to prevent the liquid from flowing out of the liquid pressure supply unit.

  Further, in the power unit mount structure according to the present invention, the variable stopper comes into contact with the displacement restricting portion in a protruding state. Thus, according to the power unit mounting structure of the present invention, when a large input is applied, large displacement of the power unit is suppressed, and further, large deformation of the mounting case is suppressed, thereby improving durability.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the vehicle provided with the power unit mounting structure which concerns on embodiment of this invention, (A) is a front view and (B) is a side view. FIG. 2 is an exploded perspective view showing a power unit mount structure according to the embodiment of the present invention. It is a figure showing the state where a small input acts on the power unit mount structure concerning an embodiment of the invention, (A) is a sectional view, and (B) is an enlarged sectional view. It is a figure showing the state where large input acts on the power unit mount structure concerning an embodiment of the invention, (A) is a sectional view, and (B) is an enlarged sectional view. It is a figure which shows the state which a large input acts on the power unit mount structure which concerns on embodiment of this invention, and is displaced, (A) is sectional drawing, (B) is an expanded sectional view.

  Hereinafter, a power unit mount structure according to an embodiment of the present invention will be described in detail with reference to the drawings. Here, the power unit mount structure is a structure in which a power unit mount 20 described later is provided in the vehicle 10. In the following description, the small input is a small force acting on the power unit mount 20 when the vehicle 10 is idling or when the vehicle 10 travels on a flat road. On the other hand, the large input is a large force acting on the power unit mount 20 when the vehicle 10 rides on an obstacle or when the vehicle 10 turns a sharp curve.

  FIG. 1A is a front view showing an arrangement of a power unit 12 in a vehicle 10 including a power unit mount structure according to the present embodiment, and FIG. 1B is a side view thereof. The vehicle 10 is, for example, a passenger car, and the power unit 12 is a power source for driving the vehicle 10.

  As shown in FIG. 1B, the power unit 12 includes an engine 13 such as an internal combustion engine and a transmission 14, and is arranged in an engine compartment at the front of the vehicle 10. The engine 13 is, for example, a horizontally opposed engine or the like, and is mounted in a so-called vertical position in which the crankshaft is substantially parallel to the traveling direction of the vehicle 10.

  As shown in FIGS. 1A and 1B, a cross, which is a reinforcing member that extends in the vehicle width direction and forms a part of the vehicle body of the vehicle 10, is provided near the bottom surface of the front portion of the vehicle 10. A member 11 is provided. The cross member 11 is a support member that supports the power unit 12. A power unit mount 20 that supports the power unit 12 is attached to an upper portion of the cross member 11, and the power unit 12 is attached to an upper portion of the power unit mount 20.

  FIG. 2 is a perspective view showing the power unit mount 20. As shown in FIG. 1, the power unit mount 20 is provided between the cross member 11 and the power unit 12. The power unit mount 20 elastically supports the power unit 12 and further restricts the displacement of the power unit 12 within a certain range.

  Specifically, the power unit mount 20 includes a main body portion 21 and a vehicle body side mounting portion 22. The main body 21 is fastened to the power unit 12 described above, and the vehicle body side attachment 22 is fastened to the cross member 11 described above.

  The main body 21 includes a mount case 23, a mounting part 33, a mounting hole 34, a contact part 24, and a fixing bolt 37.

  The mount case 23 has a substantially cylindrical shape and forms the main body of the main body 21.

  The mounting portion 33 integrally protrudes outward from the opposite side of the mount case 23. The mounting hole 34 is a hole that vertically passes through the mounting portion 33, and the main body 21 is fastened to the power unit 12 by fastening means such as bolts inserted into the mounting hole 34.

  The contact portion 24 is a portion that integrally projects from the side surface of the mount case 23 to the side. The contact portion 24 is a portion that comes into contact with a displacement restricting portion 27 of the vehicle body-side mounting portion 22 described later. A variable stopper 30 is disposed on the upper surface of the contact portion 24. The variable stopper 30 will be described later with reference to FIG.

  The fixing bolt 37 is formed at the bottom of the mount case 23, is inserted into a bolt hole 38 of the vehicle-body-side mounting portion 22 described later, and is fastened.

  The vehicle body-side mounting portion 22 is formed by pressing a single steel plate, and has a seat plate 36 and a displacement restricting portion 27.

  The seat plate 36 is a portion having a substantially circular shape, and is placed on the cross member 11 described above.

  The displacement restricting portion 27 is a portion that is bent upward from the outer peripheral edge of the seat plate 36 and is formed so as to cover the contact portion 24 of the main body 21 from above. The displacement restricting portion 27 is a portion that comes into contact with the contact portion 24 or the variable stopper 30 according to the situation of the vehicle 10.

  The configuration of the power unit mount 20 will be described in detail with reference to FIG. FIG. 3A is a cross-sectional view of the power unit mount 20 taken along section line AA in FIG. 2, and FIG. 3B is an enlarged cross-sectional view showing the contact portion 24 and its periphery in an enlarged manner. .

  Referring to FIG. 3 (A), a liquid filling portion 26 is formed by making the inside of mount case 23 hollow, and liquid 25 is filled in liquid filling portion 26. The lower part of the mount case 23 is formed of a soft material such as rubber, and the vibration of the engine 13 is absorbed by the deformation of the soft material. On the other hand, the upper part of the mount case 23 is formed of a hard material such as a hard resin or a metal. Here, the soft part and the hard part of the mount case 23 are indicated by different hatching.

  As described above, the contact portion 24 that integrally projects from the side surface of the mount case 23 toward the side is formed, and the fluid pressure supply portion 28 serves as a flow path extending from the liquid sealing portion 26 to the contact portion 24. Are formed.

  The variable stopper 30 is arranged in the contact part 24. The variable stopper 30 is a portion that advances and retreats in accordance with the load input to the liquid filling portion 26. When the main body 21 contacts the vehicle body-side mounting portion 22, the variable stopper 30 contacts the displacement restricting portion 27. The configuration of the variable stopper 30 will be described later with reference to FIG.

  A gap 29 is formed between the variable stopper 30 of the main body 21 and the displacement restricting portion 27 of the vehicle body side mounting portion 22. The formation of the gap 29 can suppress the transmission of the vibration generated from the engine 13 to the vehicle body side.

  Referring to FIG. 3 (B), a housing space 42 is formed as a cavity at the tip end of the contact portion 24, and the housing space 42 is connected to the liquid sealing portion 26 via the liquid pressure supply portion 28. Is in communication with Further, a hole 43 is formed between the storage space 42 and the upper surface of the contact portion 24.

  The variable stopper 30 includes a substantially disk-shaped outer head 39, a substantially disk-shaped inner head 40, and a substantially columnar shaft 41 connecting the outer head 39 and the inner head 40. The external head 39 is arranged on the upper surface of the contact portion 24, the internal head 40 is stored in the storage space 42, and the shaft portion 41 slidably passes through the hole 43. The variable stopper 30 is made of, for example, a hard synthetic resin or metal. The variable stopper 30 is capable of moving forward and backward in response to an input to the power unit mount 20, and here shows a state in which the variable stopper 30 does not protrude.

  The distance L <b> 10 between the upper surface of the external head 39 of the variable stopper 30 and the lower surface of the displacement restricting portion 27 is set to a value outside the variable stopper 30 even when the main unit 21 vibrates due to the small input acting on the power unit mount 20. The head 39 does not contact the displacement restricting portion 27.

  The first sealing means 31 is arranged between the inner surface of the hole 43 of the contact portion 24 and the outer surface of the shaft 41 of the variable stopper 30. The first sealing means 31 is made of, for example, a soft resin such as rubber, and seals between the inner surface of the hole 43 and the outer surface of the shaft 41 while allowing the shaft 41 to slide. Thereby, it is possible to prevent the liquid 25 from leaking out from between the hole 43 and the shaft 41.

  The second sealing means 32 is arranged between the hydraulic pressure supply unit 28 and the storage space 42. The second sealing means 32 is made of, for example, a resin material formed in a sheet shape. By disposing the second sealing means 32, it is possible to prevent the liquid 25 from leaking to the outside.

  Hereinafter, functions and operations of the power unit mount 20 having the above-described configuration will be described.

  A case where a small input is applied to the power unit mount 20 will be described with reference to FIG. Referring to FIG. 3 (A), when a small input is applied to power unit mount 20, the pressure input to liquid 25 of liquid filling portion 26 from the power unit side or the vehicle body side is small. Therefore, referring to FIG. 3B, the pressure acting on the storage space 42 via the second sealing means 32 is also small, and the variable stopper 30 does not protrude upward. In other words, the external head 39 of the variable stopper 30 is placed on the upper surface of the contact portion 24 or is very close to the upper surface.

  As a result, the distance L10 between the external head 39 of the variable stopper 30 and the displacement restricting portion 27 is ensured to be sufficiently long. In other words, the gap 29 is formed sufficiently large. Therefore, even when a small input acts on the power unit mount 20 by operating the engine 13 of the power unit 12 described above, the variable stopper 30 of the main body 21 and the displacement restricting portion 27 of the vehicle body side mounting portion 22 are separated from each other. Therefore, no vibration is transmitted to the vehicle body via the variable stopper 30 and the displacement restricting portion 27. The small input is absorbed by the deformation of the flexible portion of the main body 21, and most of the small input is not transmitted to the cross member 11. Therefore, it is possible to improve the comfort of the occupant during idling or running on a flat road.

  A case where a large input acts on the power unit mount 20 will be described with reference to FIGS. FIG. 4A shows a case where a large input is applied, and is a cross-sectional view taken along line AA of FIG. FIG. 4B is an enlarged cross-sectional view in which the contact portion 24 and its peripheral portion in FIG. 4A are enlarged.

  Referring to FIG. 4A, when a large input acts on power unit mount 20, the large input applies pressure to liquid 25 of liquid filling portion 26 from the power unit side or the vehicle body side.

  Referring to FIG. 4B, the pressure is transmitted to storage space 42 via liquid 25 sealed in liquid pressure supply unit 28 and second sealing means 32. When the internal head 40 of the variable stopper 30 is pushed upward by the pressure, the entire variable stopper 30 slides upward. As a result, the external head 39 of the variable stopper 30 approaches the displacement restricting portion 27, and the distance L10 between the variable stopper 30 and the displacement restricting portion 27 is shorter than in the case of the small input shown in FIG. Become. In other words, the gap 29 becomes smaller.

  Referring to FIG. 5, a case where the main body 21 is deformed upward due to a large input acting is shown. FIG. 5A is a cross-sectional view of the power unit mount 20 in this case, and FIG. 5B is an enlarged cross-sectional view in this case.

  Referring to FIG. 5 (A), when the soft portion of main body 21 is deformed by a large input, variable stopper 30 projecting upward from contact portion 24 comes into contact with displacement restricting portion 27.

  Referring to FIG. 5B, the external head 39 of the variable stopper 30 is in contact with the displacement restricting portion 27 while projecting upward from the contact portion 24. Thereby, the movement of the power unit 12 shown in FIG. 1 can be restricted, and, for example, the response characteristics at the time of cornering of the vehicle 10 can be improved. Further, excessive deformation of the mount case 23 is suppressed, and the durability of the mount case 23 can be improved.

  When the application of the large input is completed, the power unit mount 20 returns to the state shown in FIG. That is, the variable stopper 30 is stored inside the storage space 42, and the distance L10 between the variable stopper 30 and the displacement restricting portion 27 is ensured to be sufficiently long.

  According to the present embodiment, referring to FIG. 3 (B), by providing the variable stopper 30 which advances and retreats in accordance with the load applied to the main body 21, the contact portion 24 of the main body 21 and the vehicle body side mounting are provided. The distance L10 between the portion 22 and the displacement restricting portion 27 can be adjusted. That is, when a small input acts on the power unit mount 20 during idling or traveling on a flat road, as shown in FIG. 3B, the variable stopper 30 is not protruded so that the distance L10 is sufficiently long. . In other words, the gap 29 is made large. Thereby, the spring constant of the mount case 23 is softened, the vibration damping effect of the main body 21 is increased, and the transmission of the vibration generated by the operation of the engine 13 to the cross member 11 is suppressed. Therefore, the comfort of the occupant of the vehicle 10 can be improved.

  On the other hand, referring to FIG. 4B, when a large input is applied to power unit mount 20 when vehicle 10 travels on a sharp curve or the like, variable stopper 30 is projected using the large input, and distance L10 is applied. Is shortened. In other words, the gap 29 is reduced. Therefore, as shown in FIG. 5 (B), when the input is large, the variable stopper 30 of the main body 21 comes into contact with the displacement restricting portion 27, so that the excessive displacement of the power unit 12 connected to the main body 21 is performed. And the responsiveness when the vehicle 10 travels on a curve can be improved.

  With the above-described configuration, it is possible to suppress the transmission of the operation vibration of the engine 13 to the vehicle body, to appropriately restrict the movement of the power unit 12, and to improve the durability of the power unit mount 20.

  Further, in the present embodiment, since the size of the gap 29 can be satisfactorily adjusted with a simple configuration in which the main body 21 is provided with the variable stopper 30, there is no great increase in cost.

  As described above, the embodiments of the present invention have been described, but the present invention is not limited thereto, and can be changed without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 10 Vehicle 11 Cross member 12 Power unit 13 Engine 14 Transmission 20 Power unit mount 21 Main part 22 Body side attaching part 23 Mount case 24 Contact part 25 Liquid 26 Liquid sealing part 27 Displacement regulating part 28 Liquid pressure supply part 29 Gap 30 Variable stopper 31 First sealing means 32 Second sealing means 33 Mounting part 34 Mounting hole 36 Seat plate 37 Fixing bolt 38 Bolt hole 39 External head 40 Internal head 41 Shaft part 42 Storage space 43 Hole part

Claims (5)

A body portion attached to the power unit side, and a vehicle body side attachment portion attached to the vehicle body side,
The main body includes a mount case, a contact portion formed continuously with the mount case, and a liquid filling portion that is a cavity formed inside the mount case and in which a liquid for damping shock is filled. And having
The vehicle body-side mounting portion has a displacement restricting portion that restricts the movement of the main body portion by contacting the contact portion,
The main body further includes:
A liquid pressure supply unit formed inside the contact part in communication with the liquid sealing part;
The width of a gap formed between the abutting portion of the main body and the displacement restricting portion of the vehicle-body-side mounting portion is changed by moving forward and backward in accordance with the hydraulic pressure acting on the hydraulic pressure supply portion. And a variable stopper. The contact portion protrudes laterally from the mount case,
The power unit mount structure according to claim 1, wherein the displacement restricting portion is formed at a position facing the contact portion from above.   The power unit mounting structure according to claim 1 or 2, wherein a first sealing means for sealing the liquid is provided at a portion where the variable stopper and the mount case slide.   The power unit mounting structure according to any one of claims 1 to 3, wherein a second sealing means for sealing the liquid is provided between an end of the liquid pressure supply unit and the variable stopper. . The power unit mounting structure according to any one of claims 1 to 4, wherein the variable stopper comes into contact with the displacement restricting portion in a protruding state.

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