Transmission mounting device for rear wheel drive vehicles

Abstract

The present invention provides a transmission mounting device for a rear-wheel drive vehicle, which is mounted below a transmission, a bushing is located between the transmission mounting device and the transmission to reduce the vibration of the transmission, and the transmission mounting device includes: a central unit, which is configured to be mounted below the bushing to support the transmission; and side units, which are formed at a first side portion and a second side portion of the central unit and are configured to be combined with a vehicle body, wherein each of the side units includes a plurality of legs formed along the longitudinal direction of the central unit. The transmission mounting device for a rear-wheel drive vehicle can improve the vibration and noise performance and collision performance of the vehicle.

Description

Technical Field

[0001] The present invention relates to a transmission mounting device, and more particularly to a transmission mounting device for a rear-wheel drive vehicle. Background Art

[0002] Generally, in a rear-wheel drive vehicle, the engine is mounted in the front-rear direction, and the transmission is connected to the rear of the engine. Therefore, the engine mount and the transmission mounting device are mounted to be separated from each other in the front-rear direction of the vehicle. The engine is supported by the vehicle body through the engine mount, and the transmission is supported by the vehicle body through the transmission mounting device.

[0003] The conventional transmission mounting device is mounted below the transmission, and the bushing is mounted between the transmission and the transmission mounting device. The bushing reduces the vibration and noise of the transmission during acceleration, and the stiffness of the transmission mounting device affects the vibration and noise performance of the bushing. In other words, the stiffness of the transmission mounting device affects the vibration and noise of the transmission during acceleration (noise is generated due to vibration). Therefore, it is necessary to ensure the vibration and noise performance of the bushing of the transmission by increasing the stiffness of the transmission mounting device.

[0004] Furthermore, when a frontal collision of the vehicle occurs, the engine may move backward, thereby deforming the passenger compartment (interior of the vehicle). Therefore, when a frontal collision of the vehicle occurs, it is necessary to ensure the safety of the passengers by minimizing the deformation of the passenger compartment. In order to minimize the deformation of the passenger compartment when a frontal collision of the vehicle occurs, the engine may be lowered while moving backward.

[0005] However, if the transmission mounting device is not broken when a frontal collision of the vehicle occurs, the engine moves backward, the transmission rotates, and the drive shaft bends upward, thereby possibly increasing the possibility of injury to passengers. Therefore, the transmission mounting device needs to have a strength small enough to be broken by the collision load.

[0006] The vibration and noise performance and the collision performance are main performance factors of a vehicle, but these two performances conflict with each other in terms of the rigidity of the transmission mounting device, so it is difficult to ensure the two performances at the same time.

[0007] The information disclosed in the background section of the present invention is only intended to deepen the understanding of the general background technology of the present invention, and should not be regarded as acknowledging or suggesting in any form that the information constitutes the prior art already known to those skilled in the art. Summary of the invention

[0008] Various aspects of the present invention are directed to providing a transmission mounting device for a rear-wheel drive vehicle, which can improve the vibration and noise performance and collision performance of the vehicle.

[0009] Various aspects of the present invention are directed to providing a transmission mounting device for a rear-wheel drive vehicle, which is mounted below the transmission, with a bushing located between the transmission mounting device and the transmission to reduce vibration of the transmission, the transmission mounting device comprising: a central unit, which is configured to be mounted below the bushing to support the transmission; and side units, which extend from both side edges of the central unit and are configured to be combined with a vehicle body, wherein each of the side units may include a plurality of legs formed along the longitudinal direction of the central unit.

[0010] In an exemplary embodiment of the present invention, a space may be formed between adjacent legs of the side unit.

[0011] In another exemplary embodiment of the present invention, a mounting hole for combining the transmission mounting device with the vehicle body may be formed at an end portion of each of the plurality of leg portions.

[0012] In another exemplary embodiment of the present invention, the plurality of legs may include a side horizontal plane portion and a side vertical plane portion, wherein the side horizontal plane portion extends along the longitudinal direction of the central unit, and the side vertical plane portion extends downward from the edge portion of the side horizontal plane portion and thus has a rectangular cross-sectional structure with an open bottom side.

[0013] In another exemplary embodiment of the present invention, the central unit may include a central horizontal plane portion and a central vertical plane portion, wherein the central horizontal plane portion extends along the longitudinal direction of the central unit, and the central vertical plane portion extends downward from the edge portion of the central horizontal plane portion and thus has a rectangular cross-sectional structure with an open bottom side.

[0014] In still another exemplary embodiment of the present invention, the height of the central vertical plane portion may be greater than the height of the side vertical plane portions by a specified value or more.

[0015] By incorporating the accompanying drawings and Figure 1 With the detailed description being used to illustrate certain principles of the present invention, other features and advantages of the method and apparatus of the present invention will become more specifically clear or elucidated.

[0016] Other aspects and exemplary embodiments of the invention are discussed below.

[0017] The above features and other features of the present invention are discussed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a diagram exemplarily showing the arrangement structure of an engine and a transmission of a rear-wheel drive vehicle;

[0019] Figure 2 is a diagram exemplarily showing an arrangement structure of a bushing installed under a transmission and a transmission mounting device;

[0020] Figure 3 is a perspective view of a transmission mounting device according to various aspects of the present invention;

[0021] Figure 4 is a bottom view of a transmission mounting device according to various aspects of the present invention;

[0022] Figure 5 It is along Figure 3 A cross-sectional view taken along line AA of FIG. 1 , wherein the central reinforcing rib is omitted;

[0023] Figure 6 It is along Figure 3 A cross-sectional view taken along line BB of , wherein the side reinforcement ribs are omitted;

[0024] Figure 7 is a diagram exemplarily showing a deformation suppressing force (inertia force) of a central unit with respect to a vibration load applied to a transmission mounting device; and

[0025] Figure 8 is a diagram exemplarily showing a bending moment of a side unit with respect to a frontal collision load applied to a transmission mounting device.

[0026] It should be understood that the accompanying drawings are not drawn to scale, showing slightly simplified depictions of various features that illustrate the basic principles of the invention. The specific design features of the present invention disclosed herein (including, for example, specific dimensions, orientations, locations, and shapes) will be determined in part by the specific intended application and use environment.

[0027] In the figures, reference numbers refer to the same or equivalent parts of the present invention throughout the several figures of the drawing. DETAILED DESCRIPTION

[0028] Below will be referred to in detail various embodiments of the present invention, examples of these embodiments are shown in the accompanying drawings and are described as follows. Although the present invention will be described in conjunction with exemplary embodiments, it should be appreciated that this specification is not intended to limit the present invention to those exemplary embodiments. On the other hand, the present invention is intended to not only cover these exemplary embodiments, but also cover various alternative forms, modified forms, equivalent forms and other embodiments that can be included in the spirit and scope of the present invention defined by the appended claims.

[0029] like Figure 1, an engine 1 of a rear-wheel drive vehicle is mounted in an engine compartment installed in the front area of ​​the vehicle, and a transmission 2 is connected to the rear of the engine 1. The engine 1 is combined with the vehicle body through an engine mount, and the transmission 2 is supported by the vehicle body through a transmission mounting device.

[0030] like Figure 2 , the transmission mounting device 100 is mounted below the transmission 2 in a state where both ends of the transmission mounting device 100 are combined with the vehicle body, and a bushing 3 for reducing vibration of the transmission 2 is mounted between the transmission mounting device 100 and the transmission 2. The bushing 3 is fixedly mounted at the lower end of the transmission 2 and is supported by the transmission mounting device 100.

[0031] That is, the transmission mounting device 100 is mounted below the transmission 2 by inserting the bushing 3 between the transmission mounting device 100 and the transmission 2, and the bushing 3 is deformed in a state where the lower surface of the bushing 3 is supported by the transmission mounting device 100, and absorbs the vibration of the transmission 2. The bushing 3 may be a rubber bushing that can be elastically deformed due to the vibration load of the transmission 2 and absorbs the vibration of the transmission 2.

[0032] The transmission mounting device 100 of a rear-wheel drive vehicle according to various aspects of the present invention is a mounting bracket that is mounted below the transmission 2 by inserting the bushing 3 described above between the mounting bracket and the transmission 2. Figure 3 and Figure 4 As exemplarily shown in FIG. 8 , the transmission mounting device 100 may include a central unit 110 and a side unit 120 .

[0033] The central unit 110 is installed below the bushing 3 to support the transmission 2 and the bushing 3, the central unit 110 is connected to the transmission 2 through the bushing 3, and receives the vibration load applied downward due to the vibration of the transmission 2 (refer to Figure 7 ).

[0034] In order for the bushing 3 to normally absorb the vibration of the transmission 2, it is necessary to minimize the deformation of the central unit 110 relative to the vibration load. In addition, in order to minimize the deformation of the central unit 110 relative to the vibration load, it is necessary to increase the inertia force of the central unit 110, wherein the central unit 110 maintains the current state without being deformed by the vibration load.

[0035] The central unit 110 is a unit to which the vibration of the transmission 2 is mainly input through the bushing 3, and may include a central horizontal plane portion 111 extending in the left-right direction and the horizontal direction of the vehicle body and a central vertical plane portion 112 extending in the up-down direction of the vehicle body and the vertical direction of the vehicle body. The central vertical plane portion 112 may be formed by extending from the edge portion of the central horizontal plane portion 111 in a downward direction (vertical direction). Such a central unit 110 is not a mass block, but a plate-type structure that can be bent in a specified direction as needed, and the central unit 110 may have a substantially rectangular cross-sectional structure with an opening on the bottom side (refer to Figure 5 ).

[0036] In order to reduce the deformation of the central unit 110 with respect to the vibration load of the transmission 2, the height of the central unit 110 is higher than the height of the side unit 120 by a specified value or more. In more detail, based on the up-down direction of the vehicle body, the height of the central vertical plane portion 112 of the central unit 110 is greater than the height of the side unit 120 (that is, the height of the side vertical plane portion) by a specified value or more. That is, the height (the width in the up-down direction) of the central vertical plane portion 112 is greater than the height (the width in the up-down direction) of the side vertical plane portion 122 by a specified value or more. Therefore, the weight of the central unit 110 can be increased compared with the side unit 120, and the inertial force for suppressing the deformation of the central unit 110 can be increased by increasing the weight of the central unit 110.

[0037] A retaining groove 113 in which a bushing 3 mounted at a lower end of the transmission 2 is disposed may be formed at both ends of the central horizontal plane portion 111. The retaining groove 113 may be formed by bending left and right areas of the central horizontal plane portion 111 downward into a concave structure.

[0038] The through hole 114 may be formed at the holding groove 113 formed at the left and right areas of the central horizontal plane portion 111 by perforating the central horizontal plane portion 111. The through hole 114 may be used to mount the bushing 3 at the lower end of the transmission 2. The through hole 114 may not be formed at the central area of ​​the transmission 2 on the central unit 100 where the vibration load is concentrated.

[0039] In addition, if Figure 4 , a plurality of central reinforcing ribs 115 may protrude from the bottom surface of the central horizontal plane portion 111. The plurality of central reinforcing ribs 115 may extend downward from the bottom surface of the central horizontal plane portion 111. The plurality of central reinforcing ribs 115 may be formed as a diaphragm structure that extends continuously to increase the rigidity of the central unit 110 and simultaneously minimize the weight increase of the central unit 110.

[0040] A plurality of central reinforcing ribs 115 may be formed on the bottom surface of the central horizontal plane portion 111 to be bilaterally symmetrical.

[0041] In addition, the side units 120 are formed on both sides of the central unit 110, ie, the left and right sides, and are combined with the vehicle body. The side units 120 extend from both side edge portions of the central unit 110 in the left-right direction of the vehicle body.

[0042] When the vehicle is hit head-on, the engine moves backward by the collision load applied thereto in the front-rear direction thereof. Here, the downward movement of the engine is promoted by causing the deformation and fracture of the side unit 120, so the deformation of the passenger compartment of the vehicle can be reduced.

[0043] The side unit 120 is configured to minimize its fracture strength and maximize its bending moment, and thus, when a frontal collision load is input to the transmission mounting device 100, bending deformation of the side unit 120 is promoted. In order to cause deformation and fracture of the side unit 120 due to a collision load applied in the front-rear direction of the vehicle body, the side unit 120 may include a plurality of legs 120a installed in the front-rear direction of the vehicle body. If the side unit 120 includes a plurality of legs 120a subdivided from the side unit 120, the volume of the side unit 120 may be minimized, and thus the bending moment of the side unit 120 may be maximized.

[0044] The plurality of legs 120a may extend from the left edge portion and the right edge portion of the central unit 110, respectively. In more detail, the plurality of legs 120a may include a side horizontal plane portion 121 and a side vertical plane portion 122, the side horizontal plane portion 121 extending in the left-right direction of the vehicle body and in the horizontal direction of the vehicle body, and the side vertical plane portion 122 extending in the up-and-down direction of the vehicle body and in its vertical direction. The side vertical plane portion 122 may be formed by extending from the edge portion of the side horizontal plane portion 121 in a downward direction (vertical direction). Such a leg 120 is not a mass block, but may be a plate-type structure that is bent in a specified direction as needed, and the plurality of legs 120 may have a generally rectangular cross-sectional structure with an opening on the bottom side (refer to Figure 6 ).

[0045] In addition, a space 124 is formed between adjacent legs 120a of the side unit 120. By forming the space 124, bending deformation of the plurality of legs 120a and breakage of the side unit 120 due to a collision load can be facilitated.

[0046] When a collision load is input to the transmission mounting device 100 , the plurality of legs 120 are bent and deformed in the front-rear direction thereof, and thus, it is possible to minimize the shock transmitted to the vehicle body and allow the engine to descend.

[0047] In the side unit 120 having the above structure, the total width of the side unit 120 obtained by adding the widths of the multiple legs 120a arranged on the left side (or right side) of the central unit 110 in the front-to-back direction excluding the space 124 can be smaller than the total width of the central unit 110 in the front-to-back direction thereof, and the total width of the side unit 120 in the front-to-back direction including the width of the space 124 and the multiple legs 120a can be larger than the total width of the central unit 110 in the front-to-back direction thereof.

[0048] The side unit 120 can be combined with the vehicle body using a mounting hole 123 formed through the plurality of legs 120a. The mounting hole 123 can be formed at the end of each of the plurality of legs 120a close to the vehicle body. In more detail, the mounting hole 123 can be formed at the end of the side horizontal plane portion 121.

[0049] In addition, a plurality of side reinforcing ribs 125 may protrude from the bottom surface of the side horizontal plane portion 121. The plurality of side reinforcing ribs 125 may extend downward from the bottom surface of the side horizontal plane portion 121. The side reinforcing ribs 125 installed on the left side of the central unit 110 and the side reinforcing ribs 125 installed on the right side of the central unit 110 may be formed to be symmetrical to each other.

[0050] In order to cause deformation and breakage of the side unit 120 when the vehicle is subjected to a frontal collision, the strength of the side unit 120 reinforced by the side reinforcement rib 125 may be smaller than the strength of the central unit 110 .

[0051] Therefore, the side reinforcing ribs 125 can be formed on the bottom surface of the side horizontal plane portion 121, so that the weight per unit area of ​​the side reinforcing ribs 125 formed on the bottom surface of the side horizontal plane portion 121 is less than the weight per unit area of ​​the multiple central reinforcing ribs 115 formed on the bottom surface of the central horizontal plane portion 111.

[0052] In the side unit 120, if a plurality of legs 120a are bent, deformed, and thus broken due to a frontal collision load, gaps between adjacent legs 120a may widen, and the side unit 120 may break, and even the central unit 110 may break depending on the magnitude of the collision load.

[0053] The transmission mounting device 100 having the above-described construction can be deformed or broken due to collision loads, thereby improving the collision performance of the vehicle when a frontal collision occurs, and effectively reducing vibration and noise transmitted to the vehicle body when the transmission 2 vibrates during acceleration.

[0054] As is apparent from the above description, the transmission mounting apparatus for a rear-wheel drive vehicle according to various aspects of the present invention can have the following effects.

[0055] First, the transmission mounting device can ensure the deformation suppression force of the central unit against the vibration transmitted from the transmission during driving. Therefore, the deformation of the central unit caused by the vibration of the transmission during acceleration is suppressed, so the vibration reduction effect using the transmission bushing can be improved.

[0056] Secondly, the deformation and fracture of the side unit due to the collision load generated when the vehicle is collided head-on can be promoted. Therefore, when a frontal collision of the vehicle occurs, the relatively weak side unit fractures, thereby improving the collision performance of the vehicle. If the side unit fractures, the engine of the vehicle moving backward toward the passenger compartment can be lowered.

[0057] For convenience of explanation and precise definition of the appended claims, the terms "above", "below", "inside", "outside", "up", "down", "upward", "downward", "front", "back", "inside", "outside", "inward", "outward", "interior", "exterior", "inner", "outer", "forward" and "rearward" are used to describe features of the exemplary embodiments with reference to the positions of such features as shown in the drawings. It will be further understood that the term "connect" or its derivatives refer to both direct and indirect connections.

[0058] The foregoing description of specific exemplary embodiments of the present invention is presented for the purpose of illustration and description. The foregoing description is not intended to be exhaustive, nor is it intended to limit the present invention to the precise form disclosed, and it is apparent that many changes and variations are possible in light of the foregoing teachings. The exemplary embodiments are selected and described to explain the specific principles of the present invention and its practical application, so that other technicians in the field can implement and utilize various exemplary embodiments of the present invention and its different selected forms and modified forms. The scope of the present invention is intended to be limited by the appended claims and their equivalents.

Claims

1. A transmission mounting device for a rear-wheel drive vehicle, which is mounted below a transmission, and a bushing is located between the transmission mounting device and the transmission to reduce vibration of the transmission, It is characterized in that The transmission mounting device comprises: a central unit configured to be installed below the bushing to support the transmission, wherein the central unit includes a central horizontal plane portion and a central vertical plane portion, the central horizontal plane portion extending in a longitudinal direction of the central unit, the central vertical plane portion extending downward from an edge portion of the central horizontal plane portion to have a rectangular cross-sectional structure with a bottom side of the central unit opened; and a side unit formed at a first side portion and a second side portion of the central unit and configured to be combined with a vehicle body, wherein each of the side units includes a plurality of legs formed along a longitudinal direction of the central unit, Among them, the multiple legs include: a side horizontal plane portion extending along the longitudinal direction of the central unit and a side vertical plane portion extending downward from an edge portion of the side horizontal plane portion, thereby having a rectangular cross-sectional structure in which the bottom sides of the plurality of legs are open when the plurality of legs are cut in a direction perpendicular to the longitudinal direction of the central unit, wherein a plurality of central reinforcing ribs are formed on the bottom surface of the central horizontal plane portion; wherein a space is formed between adjacent legs among the plurality of legs of the side unit in a direction perpendicular to the longitudinal direction of the central unit; wherein a mounting hole for combining the transmission mounting device with the vehicle body is formed at an end of each of the plurality of legs, so that the legs and the mounting holes are spaced apart from each other in a direction perpendicular to the longitudinal direction of the central unit; wherein the height of the central vertical plane portion is greater than the height of the side vertical plane portion by a predetermined value or more; wherein a plurality of side reinforcing ribs are formed on the bottom surfaces of the side horizontal plane portions of the plurality of legs; and wherein a weight per unit area of ​​the plurality of side reinforcing ribs formed on the bottom surface of the side horizontal plane portion is smaller than a weight per unit area of ​​the plurality of central reinforcing ribs formed on the bottom surface of the central horizontal plane portion by a predetermined value or more.

2. The transmission mounting device for a rear-wheel drive vehicle according to claim 1, in, A mounting hole for coupling the transmission mounting device to the vehicle body is formed at an end portion of each of the plurality of leg portions.

3. The transmission mounting device for a rear-wheel drive vehicle according to claim 1, in, Retaining grooves are formed at the first and second ends of the central horizontal plane portion, the retaining grooves being configured to receive the bushing mounted therein.

4. The transmission mounting device for a rear-wheel drive vehicle according to claim 1, in, The plurality of central reinforcing ribs are formed on the bottom surface of the central horizontal plane portion to be bilaterally symmetrical.

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