A subframe sub-beam structure for automobiles

Abstract

This utility model discloses a subframe structure for an automobile subframe, including a subframe body with a sleeve fixedly connected to its end. This utility model effectively solves the problem of rainwater backflow at traditional terminal notches by setting a one-way valve plate structure. When external water pressure is applied, the valve plate automatically closes to form a physical barrier, while internal water can be drained directionally by the water flow impacting the valve plate, greatly reducing the risk of corrosion caused by bidirectional water seepage. The use of a segmented design with tapered and straight pipes, through the tight fit between the straight pipe section and the inner wall of the subframe body and the sealing ring press-fit, compensates for the dynamic gap seepage defects of the original snap-fit ​​structure, maintaining stable sealing performance even under vehicle vibration conditions.

Description

Technical Field

[0001] This utility model relates to the field of automobile design and manufacturing technology, and in particular to a subframe structure for an automobile. Background Technology

[0002] As a key component connecting the axle and the main frame, the subframe plays a crucial role in the automotive structure by supporting the suspension system and isolating vibration and noise. Currently, the industry commonly uses a hollow, closed beam structure, with its ports connected via mounting sleeves. However, this has long been plagued by corrosion due to internal water accumulation. Traditional sealed plug solutions, due to their completely enclosed structure, actually exacerbate condensation retention. Although subsequent technological improvements have attempted to achieve bidirectional waterproofing and drainage using terminal structures with flared openings, practical applications have revealed structural flaws: firstly, the terminal notches cannot effectively prevent external rainwater intrusion, especially during high-pressure car washes or heavy rain, where water can seep in through capillary action; secondly, the drainage channels lack an active control mechanism, and external water pressure can cause backflow when the vehicle is wading through water. More seriously, the existing snap-fit ​​connection between the terminals and the beam has micro-gaps, which can create new seepage paths under dynamic loads. These defects significantly reduce the claimed corrosion resistance; actual test data shows that the corrosion rate of the subframe using this structure in humid environments is only slightly lower than that of the traditional plug solution, far from meeting design expectations. To address the aforementioned technical bottlenecks, there is an urgent need to develop a new type of sealing structure with true one-way drainage function to fundamentally solve the problem of bidirectional water vapor infiltration. Utility Model Content

[0003] The purpose of this utility model is to address the shortcomings of existing technologies by proposing a subframe structure for automobiles.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a subframe structure for an automobile subframe, comprising a subframe body, a sleeve fixedly connected to the end of the subframe body, a connecting sleeve slidably connected to the outer wall of the sleeve inside the subframe body, a terminal fixedly connected to the side of the connecting sleeve facing the outside of the subframe body, the terminal being composed of a tapered pipe section and a straight pipe section, the end of the tapered pipe section facing the connecting sleeve being smaller than the end away from the connecting sleeve, the cross-sectional dimensions of the straight pipe section matching the internal cavity dimensions of the subframe body, a sealing ring being provided between the outer wall of the straight pipe section and the inner wall of the subframe body, a groove being provided on the lower inner wall of the tapered pipe section, a water passage opening communicating with the outside of the tapered pipe section being provided on the lower inner wall of the groove, and a valve plate for controlling unidirectional water passage being rotatably connected to the inner wall of the groove.

[0005] As a further description of the above technical solution:

[0006] The valve plate is rotatably connected to the inner wall of the settling tank by a pivot pin, which is located at the end of the valve plate near the connecting sleeve.

[0007] As a further description of the above technical solution:

[0008] The valve plate completely covers the water passage opening.

[0009] As a further description of the above technical solution:

[0010] The outer wall of the straight pipe section is provided with an annular groove, and the sealing ring is provided on the inner side wall of the annular groove. The outer wall of the sealing ring abuts against the inner side wall of the sub-beam.

[0011] As a further description of the above technical solution:

[0012] A flow guide groove is provided on the lower inner wall of the straight pipe section, with the end of the flow guide groove closer to the connecting sleeve being higher than the end farther away from the connecting sleeve.

[0013] As a further description of the above technical solution:

[0014] The connecting sleeve is made of aluminum alloy.

[0015] As a further description of the above technical solution:

[0016] The terminal is made of carbon fiber composite resin.

[0017] This utility model has the following beneficial effects:

[0018] 1. Compared with existing technologies, the subframe structure of this automobile has effectively solved the problem of rainwater backflow at the traditional terminal notch by setting a one-way valve plate structure. When external water pressure is applied, the valve plate automatically closes to form a physical barrier, while the internal water can be drained in a one-way manner by the water flow impacting the valve plate, which greatly reduces the risk of corrosion caused by two-way water seepage.

[0019] 2. Compared with existing technologies, the subframe structure of this automobile adopts a segmented design of tapered tubes and straight tubes. Through the tight fit between the straight tube section and the inner wall of the beam and the pressing of the sealing ring, the dynamic gap water leakage defect of the original snap-fit ​​structure is made up for, and the stable sealing performance can still be maintained under vehicle vibration conditions. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the subframe subbeam structure of an automobile proposed in this utility model;

[0021] Figure 2 This utility model proposes a subframe structure for an automobile subframe. Figure 1 Partial sectional view along line AA;

[0022] Figure 3 This utility model proposes a subframe structure for an automobile subframe. Figure 2 A magnified view of a section at point B in the middle;

[0023] Figure 4 This utility model proposes a subframe structure for an automobile subframe. Figure 2 A magnified view of a section at point C.

[0024] Legend:

[0025] 1. Sub-beam body; 2. Sleeve; 3. Connecting sleeve; 4. Terminal; 401. Tapered pipe section; 4011. Settling groove; 4012. Water passage opening; 402. Straight pipe section; 4021. Flow guide groove; 5. Valve plate; 6. Turning pin; 7. Sealing ring. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] Reference Figures 1 to 4 The present invention provides a subframe structure for an automobile: including a subframe body 1, a sleeve 2 fixedly connected to the end of the subframe body 1, a connecting sleeve 3 slidably connected to the outer wall of the sleeve 2 inside the subframe body 1, and a terminal 4 fixedly connected to the side of the connecting sleeve 3 facing the outside of the subframe body 1. The connecting sleeve 3 is made of aluminum alloy and the terminal 4 is made of carbon fiber composite resin.

[0028] To achieve a dynamic sealing fit between terminal 4 and sub-beam 1, terminal 4 is composed of a tapered tube section 401 and a straight tube section 402. The end of tapered tube section 401 facing the connecting sleeve 3 is smaller than the end away from the connecting sleeve 3. The cross-sectional dimensions of straight tube section 402 match the inner cavity dimensions of sub-beam 1. A sealing ring 7 is provided between the outer wall of straight tube section 402 and the inner wall of sub-beam 1. An annular groove is provided on the outer wall of straight tube section 402. The sealing ring 7 is located on the inner wall of the annular groove. The outer wall of sealing ring 7 abuts against the inner wall of sub-beam 1.

[0029] When the vehicle vibrates during operation, the straight pipe section 402 maintains a constant contact pressure with the sub-beam 1 through the sealing ring 7, eliminating the micro-gap seepage path of the traditional snap-fit ​​structure. At the same time, the gradually changing cross-section design of the tapered pipe section 401 provides clearance space for the movement of the valve plate 5.

[0030] In order to establish a reliable drainage channel, a settling trough 4011 is provided on the lower inner wall of the tapered pipe section 401, and a water passage opening 4012 communicating with the outside of the tapered pipe section 401 is provided on the lower inner wall of the settling trough 4011.

[0031] A drainage channel is formed through the water inlet 4012 and the settling tank 4011, allowing internal condensate or seepage water to be discharged outwards in a directional manner through the water inlet 4012.

[0032] To solve the problem of bidirectional water seepage, a valve plate 5 for controlling unidirectional water flow is rotatably connected to the inner wall of the settling tank 4011. The valve plate 5 is rotatably connected to the inner wall of the settling tank 4011 by a pivot pin 6. The pivot pin 6 is located at the end of the valve plate 5 near the connecting sleeve 3. The valve plate 5 completely covers the water flow opening 4012.

[0033] When the internal water reaches a certain amount, the water pressure pushes the valve plate 5 to rotate around the pivot pin 6 to open and drain the water; when external water pressure is applied, the valve plate 5 is pressed tightly against the water inlet 4012 to form a mechanical seal, effectively preventing high-pressure water jets from washing the car or backflow of water.

[0034] To optimize internal drainage efficiency, a flow guide 4021 is provided on the lower inner wall of the straight pipe section 402, with the end of the flow guide 4021 closer to the connecting sleeve 3 being higher than the end away from the connecting sleeve 3.

[0035] The guide channel 4021 guides the water inside the beam to flow along a preset path to the sink 4011, avoiding water retention. At the same time, the inclined design ensures that the drainage process is not affected by changes in vehicle posture.

[0036] Working principle: When the vehicle vibrates during driving, the straight pipe section 402 maintains a constant contact pressure with the sub-beam 1 through the sealing ring 7, eliminating the micro-gap seepage path of the traditional snap-fit ​​structure. At the same time, the tapered pipe section 401's gradually changing cross-section design provides clearance space for the valve plate 5's movement. A drainage channel is formed through the water passage opening 4012 and the settling groove 4011, allowing internal condensate or seepage water to be discharged outwards along the water passage opening 4012. When the internal water reaches a certain amount, the water pressure pushes the valve plate 5 to rotate around the pivot pin 6 to open and achieve drainage. When external water pressure is applied, the valve plate 5 is pressed tightly against the water passage opening 4012 to form a mechanical seal, effectively blocking the high-pressure water jet from car washing or backflow of water. The guide groove 4021 guides the water inside the beam to flow along a preset path to the settling groove 4011, avoiding water retention. At the same time, the inclined design ensures that the drainage process is not affected by changes in the vehicle's posture.

[0037] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A subframe structure for an automobile, characterized in that: Includes a sub-beam body (1), with a sleeve (2) fixedly connected to the end of the sub-beam body (1). A connecting sleeve (3) is slidably connected to the outer wall of the sleeve (2) inside the sub-beam body (1). A terminal (4) is fixedly connected to the side of the connecting sleeve (3) facing the outside of the sub-beam body (1). The terminal (4) is composed of a tapered tube section (401) and a straight tube section (402). The end of the tapered tube section (401) facing the connecting sleeve (3) is smaller than the end away from the connecting sleeve (3). The cross-sectional dimensions of the pipe section (402) match the inner cavity dimensions of the sub-beam body (1). A sealing ring (7) is provided between the outer wall of the straight pipe section (402) and the inner wall of the sub-beam body (1). A sinkhole (4011) is provided on the lower inner wall of the tapered pipe section (401). A water passage opening (4012) communicating with the outside of the tapered pipe section (401) is provided on the lower inner wall of the sinkhole (4011). A valve plate (5) for controlling unidirectional water passage is rotatably connected to the inner wall of the sinkhole (4011).

2. The subframe structure according to claim 1, wherein: The valve plate (5) is rotatably connected to the inner wall of the sink (4011) by a pivot pin (6), which is located at one end of the valve plate (5) near the connecting sleeve (3).

3. The subframe structure of an automobile subframe according to claim 1, characterized in that: The valve plate (5) completely covers the water passage opening (4012).

4. The subframe structure of an automobile subframe according to claim 1, characterized in that: The outer wall of the straight pipe section (402) is provided with an annular groove, and the sealing ring (7) is provided on the inner side wall of the annular groove. The outer wall of the sealing ring (7) abuts against the inner side wall of the sub-beam body (1).

5. The subframe structure of an automobile subframe according to claim 1, characterized in that: The inner lower wall of the straight pipe section (402) is provided with a flow guide groove (4021), and the end of the flow guide groove (4021) closer to the connecting sleeve (3) is higher than the end farther away from the connecting sleeve (3).

6. The subframe structure of an automobile subframe according to claim 1, characterized in that: The connecting sleeve (3) is made of aluminum alloy.

7. The subframe structure of an automobile subframe according to claim 6, characterized in that: The terminal (4) is made of carbon fiber composite resin.

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