CN106697056B - Preposition forerunner's automobile - Google Patents

Abstract

A front-wheel drive vehicle, comprising: a body; a sub-frame, which is arranged below the body and is connected to the body at the front of the vehicle; the connection mode of the sub-frame and the body is suitable for: in the When the front part of the vehicle is impacted, the subframe receives the impact force and is disconnected from the vehicle body at the connection position, and moves along the front and rear directions of the vehicle. The technical solution improves the safety performance of the vehicle.

Description

front drive car

technical field

The invention relates to the technical field of automobiles, in particular to a front-drive automobile.

Background technique

Most of the existing cars cancel the frame, and use the body with the function of the sub-frame, most of which are fixed on the body, which is called a load-bearing body. In a front-wheel-drive vehicle with a single-body body, a subframe is usually provided at the front of the car, which is smaller in size and lighter in weight than a traditional full frame, and is used to mount a small number of components such as a steering gear.

In a front-wheel drive vehicle, the subframe and the powertrain are both installed with the body, wherein the powertrain is arranged at the front of the car and mounted on the body by means of suspension, and the subframe is connected to the body by means of suspension under the body . At this time, when the car is hit by a frontal collision, the powertrain at the front of the car is greatly impacted, and the impact force is transmitted to the subframe through the suspension, resulting in a large instantaneous impact on the subframe.

Since the traditional design of the subframe only considers the requirements of a durable and stable connection between it and the body, and does not consider the design requirements of the subframe under the condition of a frontal collision, referring to Figure 1, under a large instantaneous impact force , the subframe will generate a very high acceleration peak (refer to arrow A), that is, the speed of the car will decrease to 0 in a very short time, and the large instantaneous shock will be transmitted to the passenger compartment, which will increase the impact on the driver and the driver. Risk of injury to occupants.

SUMMARY OF THE INVENTION

The problem solved by the present invention is that when an existing front-drive vehicle with a subframe is subjected to a frontal collision, the impact transmitted to the passenger compartment is relatively large, thereby increasing the risk of injury to the driver and the passenger.

In order to solve the above-mentioned problems, the present invention provides a front-drive vehicle, comprising:

body;

a subframe, arranged below the body and connected to the body at the front of the vehicle;

The connection mode of the sub-frame and the vehicle body is suitable: when the front part of the vehicle is impacted, the sub-frame receives the impact force and is disconnected from the vehicle body at the connection position, and moves along the front and rear directions of the vehicle.

Optionally, the connection mode of the subframe and the vehicle body includes bolt connection;

The bolt connection method is suitable for: when the front part of the vehicle is hit, the subframe receives the impact force to break the bolts, so as to be separated from the vehicle body and move toward the rear part of the vehicle.

Optionally, the type of the bolt is suitable for yielding during the installation of the sub-frame to the vehicle body, so as to be crushed by the sub-frame when the front part of the vehicle is impacted.

Optionally, the connection between the subframe and the body includes rivet connection;

The rivet connection method is suitable for: when the front part of the vehicle is hit, the subframe is subjected to impact force to break the rivets, so as to be separated from the vehicle body and move toward the rear part of the vehicle.

Optionally, the sub-frame is located on a side of the powertrain of the vehicle that is close to the rear of the vehicle in the front-rear direction of the vehicle, and is connected to the body on this side; or,

The subframe protrudes from the side away from the rear of the vehicle and the side close to the rear of the vehicle relative to the power assembly of the vehicle along the front and rear directions of the vehicle, and is respectively connected with the vehicle bodies on both sides of the power assembly.

Optionally, the body includes: two body longitudinal beams arranged opposite to each other along the vehicle width direction, and two body support brackets that are closer to the rear of the vehicle than the body longitudinal beam and are oppositely arranged along the vehicle width direction;

Along the front and rear directions of the vehicle, the subframes are respectively connected with the two body brackets, and are respectively connected with the two body longitudinal beams through suspension.

Optionally, the subframe extends to a side away from the rear of the vehicle and to a side close to the rear of the vehicle in the front-rear direction of the vehicle relative to the powertrain of the vehicle, and the subframe is located at the side of the rear of the vehicle. A side of the power assembly remote from the rear of the vehicle is connected to the corresponding end of the body rail.

Optionally, in the connection position of the sub-frame and the body along the front and rear directions of the vehicle, the connection mode of the sub-frame and the body bracket is suitable for: when the front of the vehicle is hit, the sub-frame is connected. The frame is disengaged from the body bracket at the connection position by the impact force, and moves toward the rear of the vehicle.

Optionally, the vehicle body bracket includes: a limiting part and a connecting part connected together;

the connecting part is connected with the subframe;

The limiting portion is located on the path that the subframe moves toward the rear of the vehicle, and has a guide surface facing the subframe along the front-rear direction of the vehicle, and the guide surface is adapted to be impacted at the front of the vehicle while guiding the subframe to move toward the rear of the vehicle.

Optionally, the included angle between the guide surface and the front-rear direction of the vehicle is an obtuse angle.

Optionally, the connection position of the suspension and the sub-frame is suitable for: when the vehicle is impacted in the front-rear direction, the suspension transmits the impact force to the sub-frame along the front-rear direction.

Optionally, the suspension has a mounting surface, the sub-frame is assembled with the mounting surface of the suspension, and the mounting surface is parallel to the front-rear direction of the vehicle.

Compared with the prior art, the technical solution of the present invention has the following advantages:

The subframe of this scheme is a detachable subframe. When the front of the car is hit by a frontal impact, the impact is transmitted to the subframe and converted into mechanical motion of the subframe.

On the one hand, this effectively reduces the instantaneous impact force value transmitted to the subframe, thereby reducing the peak of acceleration, reducing the instantaneous impact force value of the powertrain on the subframe, and reducing the risk of injury to the driver and occupants.

On the other hand, when the sub-frame moves mechanically, it consumes the vibration energy generated by the impact of the car, and has the effect of absorbing energy and reducing vibration.

Further, when the sub-frame is entirely located on the side of the powertrain of the car that is close to the rear of the car along the front-rear direction of the car, the sub-frame moves toward the rear of the car and moves downward due to the action of gravity after falling off, which is the driving force. The assembly reserves a crushable space towards the rear of the car. The larger energy generated by the impact is transmitted to the engine assembly and consumed in the crushable space, which reduces the impact force transmitted to the front panel of the vehicle, further reduces the displacement of the front panel into the passenger compartment, and reduces the The risk of injury to the driver and occupants is reduced, and the safety performance of the vehicle is improved.

Description of drawings

Fig. 1 is a schematic diagram of the change of the acceleration with time when the vehicle is subjected to a frontal impact when the subframe and the body are inseparable in the existing automobile, wherein the acceleration is expressed as the acceleration when the speed is reduced;

FIG. 2 is a partial view of the body and the subframe of the automobile according to the specific embodiment of the present invention, and the partial view is obtained from the bottom of the vehicle and the roof;

Fig. 3 is another partial view of the vehicle body and the sub-frame in the automobile according to the specific embodiment of the present invention, and the partial view is obtained by looking at the automobile along the vehicle width direction;

FIG. 4 is a schematic diagram of the change of the acceleration with time when the automobile according to the specific embodiment of the present invention is subjected to a frontal impact, wherein the acceleration is expressed as the acceleration when the speed is reduced;

5 is a schematic diagram of the positional relationship between the sub-frame and the body support when the sub-frame is not separated from the vehicle body according to the specific embodiment of the present invention;

6 is a schematic diagram of the positional relationship between the sub-frame and the vehicle body support in the vehicle according to the specific embodiment of the present invention.

Detailed ways

In order to make the above objects, features and advantages of the present invention more clearly understood, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

2 and 3, the present invention provides a new front-drive vehicle, comprising:

body 1;

The power assembly 2 is arranged in the front cabin of the vehicle, and is mounted on the body 1 through the suspension 3, and the suspension 3 has vibration absorption performance;

The subframe 4 is arranged below the body 1 and connected with the body 1, and is generally located in the front compartment of the automobile, and can be used for installing a steering gear (not shown in the figure);

The connection mode of the subframe 4 and the body 1 is suitable: when the front part 1 of the automobile is subjected to a full-width frontal impact or a frontal offset impact, the subframe 4 is affected by the impact force transmitted by the powertrain 2 through the body 1 and is connected to the body. 1 disengages and moves toward the rear of the vehicle II in the vehicle front-to-rear direction BB.

Compared with the prior art, the sub-frame 4 of this embodiment is a detachable sub-frame. 4 , when the front part of the automobile is hit by a frontal impact, the impact is transmitted to the sub-frame 4 and converted into a mechanical movement of the sub-frame 4 . On the one hand, this effectively reduces the instantaneous impact force value transmitted by the powertrain 2 to the sub-frame 4, thereby reducing the acceleration peak (please compare the arrow A in Figure 1 and the arrow C in Figure 4, the arrow A and the arrow C correspond to Acceleration peak at the same time point after the car hits), reducing the instantaneous impact force value of the powertrain 2 on the subframe 4, and reducing the risk of injury to the driver and occupants. On the other hand, when the sub-frame 4 is mechanically moving, the vibration energy generated by the impact of the vehicle is consumed, and the effect of energy absorption and vibration reduction is achieved. Furthermore, the sub-frame 4 moves toward the rear II of the vehicle and moves downward due to gravity after falling off, leaving a crushable space for the powertrain 2 toward the rear II of the vehicle. The larger energy generated by the impact is transmitted to the engine assembly 2, and is consumed in the crushable space, which reduces the impact force transmitted to the front panel of the vehicle and further reduces the displacement of the front panel into the passenger compartment. It reduces the risk of driver and occupant injury and improves vehicle safety.

The detachable design of the subframe 4 is further described below.

Referring to FIGS. 2 and 3 , the vehicle body 1 includes: two body side members 10 located at the front part I of the vehicle and oppositely arranged along the vehicle width direction DD, and closer to the vehicle rear part II than the vehicle body side members 10 and along the vehicle width direction. DD two body brackets 11 arranged opposite each other, wherein each body longitudinal beam 10 is connected with a longitudinal beam extension beam 12, and the longitudinal beam extension beam 12 extends toward the rear part II of the vehicle relative to the longitudinal beam 10, and the two body brackets 11 are respectively installed on the two sides. on each longitudinal beam extension beam 12;

Along the vehicle front and rear direction BB, the subframe 4 is connected to the two body side members 10 through the suspension 3 respectively to form two connection points E, and to the two body brackets 11 to form two connection points F.

When the automobile is subjected to a frontal collision, the longitudinal beam extension beam 12 will be squeezed by the impact on the body longitudinal beam 10 , the position of the longitudinal beam extension beam 12 will remain unchanged, and the longitudinal beam 10 will be squeezed and deformed. Therefore, as an example of the design solution for the detachment of the subframe 4, it can be that the subframe 4 is separated from the body 1 at two connection points F when the vehicle is hit by a frontal impact, and at the same time the longitudinal beam 10 is deformed to drive the subframe The frame 4 moves towards the rear II of the vehicle.

As another embodiment, the sub-frame 4 may also be separated from the body 1 at the two connection points E and F at the two connection points E and F when the sub-frame 4 is hit by a frontal impact. Better reduction of the displacement of the dash panel into the passenger compartment.

That is, at the connection point E and the connection point F, at least the subframe 4 is designed to be separated from the vehicle body 1 at the connection point F.

Taking the separation of the subframe 4 and the body 1 at the connection point F as an example, referring to FIGS. 5 and 6 , the subframe 4 and the body support 11 are connected by bolts 7, and the bolts 7 pass through the subframe 4 and the body in the vertical direction. The bracket 11 is fastened with both. Among them, the principle of separation of the subframe 4 and the body support 11 at the connection point F is as follows:

Referring to FIG. 5 , when installing the subframe 4 and the body support 11, the type of the bolts 7 should be suitable: the bolts 7 yield under the action of the installation moment, and yield means that after the installation moment of the bolts 7 reaches a certain deformation stress, Begin a non-uniform transition from elastic state to elastic-plastic state, which marks the beginning of macroscopic plastic deformation;

6 , when the sub-frame 4 is impacted, the impact is transmitted to the bolts 7 , the bolts 7 yield during the installation process, and the irreversible plastic deformation occurs under the impact of the sub-frame 4 and is crushed, and the sub-frame 4 can be move.

On the one hand, the bolts 7 yield, and yielding is the beginning of the plastic deformation of the bolts 7. The yielded bolts 7 make the mounting point F more secure, and the connection between the bolts 7 and the body bracket 11 and the subframe 4 is tighter , to meet the requirements of the structure itself and the durability of the connection. On the other hand, the yielded bolts 7 can be broken after a certain impact when the vehicle is impacted by a frontal impact, which more effectively realizes the separation of the sub-frame 4 from the vehicle body 1 after being impacted.

Therefore, according to the ability of the specific vehicle to resist impact, select the appropriate bolt 7, so that the bolt 7 yields within a reasonable installation torque range, and ensures that when the vehicle is hit by a certain impact force exceeding its elastic deformation limit, it is crushed. Frame 4 falls off smoothly. For example, for a vehicle with poor resistance to impact, the bolt 7 should be crushed when it is subjected to a small impact moment, and the bolt 7 is easily crushed, so that the subframe 4 can be crushed when it is subjected to a large impact force. A large displacement occurs to improve the anti-collision ability of the vehicle.

In addition, referring to FIGS. 2 and 3 , the suspension 3 and the body side member 10 are also connected by bolts. At this time, the bolts connecting the suspension 3 and the body side member 10 can be selectively designed to achieve or Close to yield, on the one hand, the connection of the sub-frame 4 can be more stable, and on the other hand, it can also ensure whether the bolt can break or fail under the action of a certain force. If the installation torque does not make the bolts reach or nearly yield, it cannot be guaranteed that the installation bolts of the subframe 4 will break under the action of a certain force.

In addition to the bolt connection, as a modified example, the subframe and the body can be connected by rivets, and the rivet connection is suitable for: when the front part of the car is hit, the subframe is crushed by the impact force. rivets to disengage from the body and move toward the rear of the car.

Further, referring to FIG. 2 and FIG. 3 , the connection position of the suspension 3 and the sub-frame 4 is suitable: when the automobile is hit in the front-rear direction, the suspension 3 transmits the impact force to the sub-frame 4 along the front-rear direction BB, It is well ensured that after the powertrain 2 is impacted, the impact force is more effectively transmitted to the sub-frame 4 along the front and rear direction of the car, ensuring that the sub-frame 4 can accurately move towards the rear of the car, rather than towards the car along the car. Deflection movement on both sides in the width direction.

Wherein, the suspension 3 is fixedly supported on the body longitudinal beam 10, and the suspension 3 has a mounting surface (not shown in the figure), the mounting surface is used to install the subframe 4, and is assembled with the mounting surface of the subframe 4, and fastened together. The mounting surface of the suspension 3 is parallel to the front-rear direction BB of the vehicle, which can ensure that the impact force generated by the powertrain 2 after being hit is transmitted to the sub-frame 4 along the front-rear direction BB.

Further, referring to FIGS. 5 and 6 , the body bracket 11 includes: a connecting portion 110 and a limiting portion 111 that are connected together;

The connecting portion 110 is connected with the sub-frame 4, and the bolts 7 pass through the connecting portion 110 and the sub-frame 4 in the vertical direction and are fastened together;

The limiting portion 111 is located on the path where the sub-frame 4 moves toward the rear portion II of the vehicle, and has a guide surface 112 facing the sub-frame 4 along the front-rear direction of the vehicle. On the one hand, the guide surface 112 can limit the position of the sub-frame 4 to prevent the sub-frame 4 from moving relative to the vehicle body 1 when it is assembled with the vehicle body 1 . On the other hand, the guide surface 112 is also suitable for guiding the sub-frame 4 to move toward the rear of the vehicle and toward the bottom of the vehicle body 1 when the vehicle is collided, so as to ensure that the sub-frame 4 falls off smoothly. In this way, the resistance of the sub-frame 4 by the guide surface 112 during the movement process is small, and the sub-frame 4 can effectively move toward the rear of the vehicle. Therefore, the included angle between the guide surface 112 and the front and rear direction of the vehicle is designed to be an obtuse angle, and the guide surface 112 is inclined toward the side of the sub-frame 4 , which can play a good role in limiting and guiding.

It should be noted that, referring to FIG. 2 , the sub-frame 4 is entirely located on the side of the powertrain 2 that is close to the rear II of the vehicle along the front-rear direction BB of the vehicle. At this time, the sub-frame 4 is a half-width frame. In other embodiments, the subframe can also be selected as a full subframe. Compared with the half frame, the size of the full subframe along the front and rear directions of the vehicle is larger. The side away from the rear of the vehicle and the side close to the rear of the vehicle II protrude and are connected to the body on both sides of the powertrain, respectively. At this time, the full subframe is connected to the corresponding end of the body longitudinal member on the side of the power assembly away from the rear of the vehicle, and is connected to the body bracket on the side close to the rear of the vehicle. Compared with the full frame, the half frame has smaller size, lower cost and lower fuel consumption.

Although the present invention is disclosed above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention should be based on the scope defined by the claims.

Claims (9)

1. A front-wheel-drive vehicle is characterized in that, comprising: body; a subframe, arranged below the body and connected to the body at the front of the vehicle; The connection mode of the sub-frame and the vehicle body is suitable: when the front part of the automobile is hit, the sub-frame receives the impact force and is disconnected from the vehicle body at the connection position, and moves along the front and rear directions of the vehicle; The vehicle body includes: two body longitudinal beams arranged oppositely along the vehicle width direction, and two body brackets arranged opposite to the vehicle rear portion and along the vehicle width direction compared with the vehicle body longitudinal beam; Along the front and rear directions of the vehicle, the subframes are respectively connected with two body brackets, and are respectively connected with the two body longitudinal beams through suspension; In the connection position of the subframe and the body along the front and rear directions of the vehicle, the connection mode of the subframe and the body bracket is suitable for: when the front part of the vehicle is impacted, the subframe is impacted Force is applied to disengage from the body support at the connection position and move toward the rear of the vehicle; The vehicle body bracket includes: a limiting part and a connecting part connected together; the connecting part is connected with the subframe; The limiting portion is located on the path that the subframe moves toward the rear of the vehicle, and has a guide surface facing the subframe along the front-rear direction of the vehicle, and the guide surface is adapted to be impacted at the front of the vehicle while guiding the subframe to move toward the rear of the vehicle. 2. The front-drive vehicle of claim 1, wherein the connection between the subframe and the vehicle body comprises bolt connection; The bolt connection method is suitable for: when the front part of the vehicle is hit, the subframe receives the impact force to break the bolts, so as to be separated from the vehicle body and move toward the rear part of the vehicle. 3. The front-wheel drive vehicle of claim 2, wherein the bolts are of a type suitable for yielding during the installation of the subframe to the vehicle body to achieve impact on the front of the vehicle is crushed by the sub-frame. 4. The front-drive vehicle of claim 1, wherein the connection between the sub-frame and the vehicle body comprises a rivet connection; The rivet connection method is suitable for: when the front part of the vehicle is hit, the subframe is subjected to impact force to break the rivets, so as to be separated from the vehicle body and move toward the rear part of the vehicle. 5 . The front-wheel drive vehicle of claim 1 , wherein the sub-frame is located on a side of the powertrain of the vehicle that is close to the rear of the vehicle along the front-rear direction of the vehicle, and is connected to the vehicle body on this side. 6 . ;or, The subframe protrudes from the side away from the rear of the vehicle and the side close to the rear of the vehicle along the front and rear direction of the vehicle relative to the powertrain of the vehicle, and is respectively connected with the vehicle bodies on both sides of the powertrain. 6 . The front-wheel drive vehicle of claim 1 , wherein the sub-frame extends to a side away from the rear of the vehicle along the front-rear direction of the vehicle relative to the powertrain of the vehicle, and extends toward the rear of the vehicle. 7 . One side of the vehicle body protrudes, and the subframe is connected to the corresponding end of the body side member on the side of the power assembly away from the rear of the vehicle. 7 . The front-wheel drive vehicle of claim 1 , wherein the included angle between the guide surface and the front-rear direction of the vehicle is an obtuse angle. 8 . 8 . The front-drive vehicle according to claim 1 , wherein the connection position of the suspension and the sub-frame is suitable for: when the vehicle is impacted in the front-rear direction, the suspension will move along the front and rear. 9 . The front-rear direction transmits the impact force to the subframe. 9 . The front-wheel drive vehicle of claim 8 , wherein the suspension has a mounting surface, the sub-frame is assembled with the mounting surface of the suspension, and the mounting surface is parallel to the front-rear direction of the vehicle. 10 . .