Mounting structure for engine shield

Abstract

The utility model provides a kind of mounting structure of engine guard plate. The mounting structure of the engine guard plate is used to install the engine guard plate on the body frame component, on the body frame component, rubber damper mounting portion for installing rubber damper is provided;On the engine guard plate, rubber damper buckle hole is formed, and the engine guard plate is buckled on the inner edge of the rubber damper buckle hole, and the rubber damper is fastened on the rubber damper mounting portion, and is installed on the body frame component integrally with the rubber damper. Based on the structure, the engine guard plate can have the function of dynamic damper.

Description

Technical Field

[0001] This utility model relates to an engine guard plate mounting structure. Background Technology

[0002] Typically, vehicles designed for rough road conditions, such as SUVs, are equipped with engine skid plates. Engine skid plates, also known as underbody protection plates or underbody shields, are plate-like components used to protect the engine and underbody components (such as fuel lines) from impacts from road bumps and flying stones when driving on rough roads. Generally, engine skid plates are located below the engine compartment or floor panel, for example, by bolting them directly to body frame components such as crossbeams extending along the width of the vehicle.

[0003] However, existing engine guards only protect the engine and underbody components. In response, the inventors of this invention researched ways to make engine guards more multifunctional and discovered that if they could also function as dynamic dampers, vehicle vibrations could be significantly reduced, thereby improving vehicle stability and ride comfort. Utility Model Content

[0004] In view of the above situation, the purpose of this utility model is to provide an installation structure for an engine guard plate that enables the engine guard plate to also function as a dynamic damper.

[0005] As a technical solution to the above-mentioned technical problems, this utility model provides an engine guard plate mounting structure. This engine guard plate mounting structure is used to mount the engine guard plate on a vehicle body frame component. Its features include: a rubber damper mounting portion for mounting a rubber damper is provided on the vehicle body frame component; a rubber damper snap-fit ​​hole is formed on the engine guard plate; the engine guard plate is integrally mounted on the vehicle body frame component with the rubber damper snapped onto the inner edge of the rubber damper snap-fit ​​hole and the rubber damper fastened to the rubber damper mounting portion.

[0006] The advantage of the mounting structure of the engine guard plate of this utility model, which has the above-described structure, is that it enables the engine guard plate to also function as a dynamic damper. Specifically, under normal circumstances, vehicle vibration is mainly caused by the rotation of the drive shaft and transmission shaft, and the frequency of this vibration is lower than the natural vibration frequency of the engine guard plate itself. In the technical solution of this utility model, since the engine guard plate and the rubber damper are integrally mounted on the vehicle body frame component, the natural vibration frequency of the unit composed of the engine guard plate and the rubber damper can be set lower than the natural vibration frequency of the engine guard plate itself. In other words, the natural vibration frequency of the unit composed of the engine guard plate and the rubber damper can be made close to the frequency of vehicle vibration caused by the rotation of the drive shaft and transmission shaft. Therefore, the engine guard plate can also function as a dynamic damper; that is, the rubber damper can be used as the spring of the dynamic damper, and the engine guard plate can be used as the mass block of the dynamic damper. Consequently, vehicle vibration can be significantly reduced, thereby improving driving stability and ride comfort.

[0007] In addition, in the above-mentioned engine guard plate installation structure of this utility model, it is preferred that the rubber damper mounting part is a cylindrical bushing extending downward from the lower surface of the vehicle frame component. The rubber damper is cylindrical, and its inner diameter is the same as the outer diameter of the bushing. The rubber damper is fastened to the lower surface of the vehicle frame component with the bushing inserted into the internal space of the rubber damper, the bolt stud tightened on the internal thread formed on the inner circumferential surface of the bushing, and the head of the bolt abutting against the lower surface of the rubber damper.

[0008] Based on the above structure, the rubber damper can be securely installed on the vehicle body frame components without falling off through the bushing, thereby improving the reliability of the engine guard plate in preventing it from falling off.

[0009] In addition, in the above-mentioned installation structure of the engine guard plate of this utility model, it is preferred that the rubber damper is cylindrical in shape, and a recessed part is formed in the middle part of the height direction of its outer peripheral surface, which is recessed from the outer peripheral surface to the inner side. The recessed part surrounds the entire circumference, and the engine guard plate is fitted into the recessed part of the rubber damper with the inner edge of the buckling hole of the rubber damper, thus being snapped together with the rubber damper.

[0010] Based on the above structure, the engine guard plate can be installed on the vehicle body frame components without making significant modifications to the existing engine guard plate structure, using rubber dampers. Attached Figure Description

[0011] Figure 1 This is a bottom view showing the front bottom of the vehicle in an embodiment of this utility model.

[0012] Figure 2 yes Figure 1 A cross-sectional view along line II-II, pointing in the direction of the arrow.

[0013] Figure 3 It is a graph used to compare the natural vibration frequency of an existing engine guard plate unit with the natural vibration frequency of the engine guard plate unit in the embodiment of this utility model.

[0014] Figure 4 It is a graph used to compare vehicle vibration in the prior art with vehicle vibration in the embodiments of this utility model. Detailed Implementation

[0015] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In this embodiment, an example will be given of applying the present invention to an engine guard plate installed below the engine compartment. However, the present invention is also applicable to engine guard plates installed below the floor panel.

[0016] Figure 1 This is a top view of the front bottom of vehicle V in this embodiment. Vehicle V is, for example, an SUV capable of operating in adverse road conditions. Figure 1 As shown, a front bumper 1 is provided at the front of vehicle V. Inside the front bumper 1 is a bumper reinforcement (not shown). The bumper reinforcement is a body frame component extending along the width of the vehicle, with front side beams 2 extending along the length of the vehicle connected near its left and right ends. Multiple crossbeams 3 connect the two front side beams 2 to each other.

[0017] In addition, front fenders 4, serving as outer panels, are provided on both sides of the front of the vehicle V in the width direction. Wheel covers 5 are provided on the inner side of each front fender 4 in the width direction, and each wheel cover 5 houses a front wheel 6.

[0018] In this embodiment, an engine skid plate 7 is installed at the front bottom (below the engine compartment) of vehicle V. The engine skid plate 7 is a plate-shaped component used to protect the engine and components under the vehicle body (such as fuel lines) from impacts by road bumps and flying stones when vehicle V is driving in rough road conditions. Multiple parts of the engine skid plate 7 ( Figure 1 The engine guard plate 7 is secured to the three crossbeams 3 by bolts B in six locations. However, the body frame component for mounting the engine guard plate 7 is not limited to the crossbeams 3; it can also be the front side beam 2. The mounting structure of the engine guard plate 7 will be described below.

[0019] Figure 2 yes Figure 1 A cross-sectional view along line II-II, pointing in the direction of the arrow. (Example) Figure 2As shown, the engine guard plate 7 is fastened to the lower surface of the crossbeam 3 by bolts B via rubber dampers 8.

[0020] Specifically, a cylindrical bushing 31 extending downward is provided on the lower surface of the crossbeam 3, and an internal thread is formed on the inner surface of the bushing 31.

[0021] The rubber damper 8 is approximately cylindrical in shape, with its inner diameter matching the outer diameter of the bushing 31, and its height (length in the axial direction) matching the height (length in the vertical direction) of the bushing 31. Therefore, with the bushing 31 inserted into the internal space of the rubber damper 8 (the rubber damper 8 fitted onto the bushing 31), and the upper surface of the rubber damper 8 abutting against the lower surface of the crossbeam 3, the lower surface of the rubber damper 8 is flush with the lower edge of the bushing 31, and the inner surface of the rubber damper 8 is tightly fitted against the outer surface of the bushing 31.

[0022] At the middle part of the height direction of the outer peripheral surface of the rubber damper 8, there is a recessed portion 81 formed by recessing from the outer peripheral surface to the radially inward side, and the recessed portion 81 surrounds the entire circumference.

[0023] A circular rubber damper locking hole 71 is formed at the part of the engine guard plate 7 for engaging with the rubber damper 8. The inner diameter of the rubber damper locking hole 71 is the same as the radial dimension from the bottom surface of the recess 81 formed on the rubber damper 8 to the axis of the rubber damper 8. Therefore, when the rubber damper 8 is inserted into the rubber damper locking hole 71 of the engine guard plate 7, the opening edge (inner edge) of the rubber damper locking hole 71 will be embedded in the recess 81, thereby locking the engine guard plate 7 and the rubber damper 8 together. Hereinafter, the unit formed by locking the engine guard plate 7 and the rubber damper 8 together is referred to as the engine guard plate unit 10.

[0024] In this embodiment, the natural vibration frequency of the engine guard plate unit 10 is set to be approximately the same as the frequency of the vibration of the vehicle V caused by the rotation of the drive shaft and transmission shaft. In other words, by appropriately selecting the material, thickness, and hardness (rubber type, etc.) of the engine guard plate 7, the natural vibration frequency of the engine guard plate unit 10 is made approximately the same as the frequency of the vibration of the vehicle V caused by the rotation of the drive shaft and transmission shaft. Specifically, in order to make the natural vibration frequency of the engine guard plate unit 10 approximately the same as the vibration frequency of the vehicle V, it is necessary to select and determine the material, thickness, and hardness of the engine guard plate 7 and the rubber damper 8 through experiments and simulations. In this embodiment, the engine guard plate 7 is made of stainless steel, but aluminum alloy or resin material can also be used; the thickness of the engine guard plate 7 is set to 2 mm, but is not limited to this value; the rubber damper 8 is made of nitrile rubber, but natural rubber, silicone rubber, ethylene propylene rubber, butyl rubber, or polyurethane can also be used.

[0025] The engine guard plate unit 10, formed by the engine guard plate 7 and the rubber damper 8, is installed on the crossbeam 3 by fastening the rubber damper 8 to the bushing 31 with bolt B. Specifically, the bushing 31 is inserted into the internal space of the rubber damper 8 in the engine guard plate unit 10 (the unit formed by the engine guard plate 7 and the rubber damper 8), and then the bolt B is screwed in from below the bushing 31 so that the head B1 of the bolt B abuts against the lower surface of the rubber damper 8, thereby installing the engine guard plate unit 10 on the lower surface of the crossbeam 3 in a way that makes it difficult to detach.

[0026] Next, the effects of the mounting structure of the engine guard plate 7 will be explained. Generally, the main vibration of a vehicle is caused by the rotation of the drive shaft and transmission shaft, and the frequency of this vibration is lower than the natural vibration frequency of the engine guard plate 7. In this embodiment, since the engine guard plate unit 10, formed by the engine guard plate 7 and the rubber damper 8 being snapped together, is mounted on the crossbeam 3, the natural vibration frequency of the engine guard plate unit 10 can be set lower than the natural vibration frequency of the engine guard plate 7 and closer to the vibration frequency of the vehicle V.

[0027] Figure 3 It is a graph used to compare the natural vibration frequency of an existing engine guard plate unit with the natural vibration frequency of the engine guard plate unit 10 in this embodiment. Figure 3 In the diagram, the horizontal axis represents the vibration frequency, and the vertical axis represents the amplitude. The vibration frequency at which the amplitude is maximum is the natural vibration frequency. Additionally, Figure 3In the diagram, dashed line B represents the amplitude of a single engine guard plate unit in the prior art at various vibration frequencies, solid line A represents the amplitude of the engine guard plate unit 10 in this embodiment at various vibration frequencies, and frequency band C is the frequency band of vehicle vibration caused by the rotation of the drive shaft and transmission shaft. Figure 3 As shown, the natural vibration frequency of the engine guard plate unit 10 is set lower than the natural vibration frequency of the engine guard plate unit, and the natural vibration frequency of the engine guard plate unit 10 is located within the frequency band C of vehicle vibration.

[0028] Therefore, the engine guard plate unit 10 can function as a dynamic damper. That is, the rubber damper 8 can act as a spring for the dynamic damper, and the engine guard plate 7 can act as a mass block for the dynamic damper. In this way, by using the engine guard plate unit 10, which also functions as a dynamic damper, vehicle vibration can be significantly reduced, and driving stability and ride comfort can be improved.

[0029] Figure 4 It is a graph used to compare vehicle vibration in the prior art with vehicle vibration in this embodiment. Figure 4 In the diagram, dashed line B represents the vibration amplitude of a vehicle at various frequencies in the prior art, solid line A represents the vibration amplitude of a vehicle at various frequencies in this embodiment, and frequency band C represents the frequency band of vehicle vibration caused by the rotation of the drive shaft and transmission shaft. Figure 4 As shown, by making the engine guard plate unit 10 also function as a dynamic damper, the vibration amplitude of the vehicle body in frequency band C is significantly reduced compared to existing technologies. This results in improved driving stability and ride comfort.

[0030] However, this utility model is not limited to the above-described embodiments and various modifications can be made. For example, in the above embodiments, the connection points between the engine guard plate 7 and the crossbeam 3 are set to 6, but this utility model is not limited to this and the number of connection points can be determined according to the actual situation.

Claims

1. An engine guard plate mounting structure for mounting the engine guard plate on a vehicle body frame component, characterized in that: The vehicle body frame component is provided with a rubber damper mounting part for mounting a rubber damper; Rubber damper clip holes are formed on the engine guard plate. The engine guard plate is installed integrally with the rubber damper on the vehicle body frame component, with the rubber damper engaged on the inner edge of the rubber damper snap hole and the rubber damper fastened to the rubber damper mounting part.

2. The mounting structure of the engine guard plate as described in claim 1, characterized in that: The rubber damper mounting part is a cylindrical bushing that extends downward from the lower surface of the vehicle body frame component. The rubber damper is cylindrical, and its inner diameter is the same as the outer diameter of the bushing. With the bushing inserted into the internal space of the rubber damper, the stud of the bolt tightened onto the internal thread formed on the inner circumferential surface of the bushing, and the head of the bolt abutting against the lower surface of the rubber damper, the rubber damper is fastened to the lower surface of the vehicle body frame component.

3. The mounting structure of the engine guard plate as described in claim 1, characterized in that: The rubber damper is cylindrical, and a recessed portion is formed at the middle of its outer circumference in the height direction, extending inward from the outer circumference. This recessed portion encircles the entire circumference. The engine guard plate is fitted into the recess of the rubber damper with the inner edge of the rubber damper's snap-fit ​​hole, and is thus integrated with the rubber damper.

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