CN103448525A - Arrangement method and structure of power assembly of long-wheelbase four-wheel drive automobile - Google Patents

Abstract

A power assembly arrangement method and structure of a long-wheelbase four-wheel-drive vehicle is characterized in that it includes a power assembly suspension system, a power assembly three-shell shell connection, and a drive shaft connection. The powertrain mount system consists of engine left mount, engine right mount, transmission mount, transfer case front mount, and transfer case rear mount. The three casings of the powertrain are connected, the engine casing and the transmission front casing are rigidly connected by bolts; the transmission front casing and the transmission rear casing are rigidly connected by bolts; the transmission rear casing and the transition plate are formed by adding rubber elastic bushings between the bolts and the mounting holes Flexible connection; the transition plate and the transfer case front case are rigidly connected by bolts; the transfer case front case and the transfer case rear case are rigidly connected by bolts. While reducing vibration and noise, the invention can greatly reduce the variation range of the stress range of the three shells of the powertrain, thereby reducing the occurrence rate of fatigue fracture failure of the three shells and ensuring the comfort and reliability of the vehicle.

Description

Powertrain Layout Method and Structure of Long Wheelbase Four-Wheel Drive Vehicle

technical field

The present invention relates to a kind of automobile technology, especially a kind of power assembly layout technology, in particular, it is suitable for the three shells of the power assembly connected by the transition plate or the power assembly with a long span due to the installation of the transfer case. The powertrain layout method and structure of four-wheel drive vehicles (especially medium-sized four-wheel drive passenger vehicles and trucks).

Background technique

As shown in Figure 2, the traditional four-wheel drive vehicle powertrain connection and suspension arrangement does not include the front suspension of the transfer case, and all shells are rigidly connected by bolts, and all transmission shafts are connected Rigid flange couplings are used. The engine, transmission, transition plate and transfer case are integrated into a single rigid body. Due to the excessively long cantilever of the transition plate and transfer case, the rigidity of the system is low, and the dynamic load bending moment on the connection between the rear case of the transmission and the transition plate is relatively large. The alternating dynamic load has a large stress range and is prone to fatigue damage.

Contents of the invention

The purpose of the present invention is to solve the problem that the existing four-wheel-drive vehicle power assembly adopts a single rigid connection and then is suspended on the vehicle frame, causing the cantilever to be too long, resulting in low system stiffness, and the dynamic load borne by the joint between the rear case of the transmission and the transition plate. In order to solve the problems of large bending moment, large alternating load stress range, and easy fatigue damage, a powertrain layout method for long-wheelbase four-wheel drive vehicles is invented, and a corresponding layout structure is provided to improve the performance of four-wheel drive vehicles. Use reliability and comfort, especially to solve the powertrain vibration and three-shell fatigue fracture phenomenon that occur in the traditional four-wheel drive vehicle powertrain connection and suspension arrangement.

One of technical solutions of the present invention is:

A method for arranging a power assembly of a long-wheelbase four-wheel-drive vehicle is characterized in that it comprises the following steps:

Firstly, suspend the engine casing with the engine mounted on the vehicle frame through at least two points, and at the same time rigidly connect the engine casing to the transmission front casing, and rigidly connect the transmission rear casing to the transmission front casing;

Second, suspend the transmission rigidly connected to the front and rear shells on the frame;

Thirdly, connect the rear case of the transmission directly to the front case of the transfer case, suspend the front case of the transfer case on the frame, and at the same time rigidly connect the front case of the transfer case to the rear case of the The rear case of the transmission is suspended on the frame; or the rear case of the transmission is flexibly connected to the transition plate, and then the transition plate is rigidly connected to the front of the transfer case, and then the front case of the transfer case is suspended on the frame. Then the rear case of the transfer case is rigidly connected with the front case of the transfer case, so that the rigid body composed of the engine case, the front case of the transmission, the rear case of the transmission, the front case of the transfer case and the rear case of the transfer case is divided into two rigid bodies. Body, to achieve the purpose of reducing the length of a single rigid connection body, reducing the dynamic load bending moment and alternating load stress amplitude.

The flexible connection adopts the method of installing a rubber elastic bushing between the bolt and the mounting hole to form a flexible connection.

The power output shaft of the transmission and the input shaft of the transfer box are connected by an elastic sleeve pin coupling; the connected parts of the other transmission shafts are connected by a rigid flange coupling.

The two suspension points for supporting the engine casing are arranged symmetrically on both sides of the engine casing.

The second technical scheme of the present invention is:

A long-wheelbase four-wheel-drive vehicle powertrain layout structure, which includes an engine housing 1 with an engine installed, a transmission front housing 2 and a transmission rear housing 3, and a transfer case front housing with a transition plate 4 installed. The housing 5 and the transfer case rear housing 6 are characterized in that the engine housing 1 is suspended on the vehicle frame through at least two suspension points, the engine housing 1 is rigidly connected to one end of the transmission front housing 2, and the front housing 2 of the transmission is rigidly connected. The other end of the case 2 is rigidly connected to one end of the transmission rear case 3, and the rigidly connected transmission front case 2 and the transmission rear case 3 are suspended on a suspension point of the vehicle frame, and it is connected to at least two suspension points of the engine case. A power system rigid body composed of an engine and a transmission is suspended on the vehicle frame at the point of placement; the transmission rear case 3 is flexibly connected with the transition plate 4 installed on the front 5 of the transfer case or directly connected with the transfer case front case 5 is flexibly connected, when the transmission rear case 3 is flexibly connected with the transfer case front case 5 through the transition plate 4, the transmission rear case 3 and one end of the transition plate 4 are connected by a flexible structure 10, and the other end of the transition plate 4 is connected to the transfer case One end of the front case 5 of the transmission is rigidly connected, and when the rear case 3 of the transmission is directly connected with the front case 5 of the transfer case flexibly, the rear case 3 of the transmission and the front case 5 of the transfer case are connected by a flexible structure 10, and the front case of the transfer case 5 is connected by a flexible structure 10. The case 5 and the transfer case rear case 6 are rigidly connected, and the transfer case front case 5 and the transfer case rear case 6 are both suspended on the vehicle frame through their respective suspension points, and the rigidly connected transfer case The front case 5 of the transfer case and the rear case 6 of the transfer case form another rigid body of the entire power system, and the two rigid bodies are flexibly connected to form a whole, so as to reduce the length of a single rigid connection body, reduce dynamic load bending moment and alternating load The purpose of stress amplitude.

The flexible structure 10 is a flexible connection of bolts with rubber elastic bushings.

The power output shaft of the transmission and the input shaft of the transfer box are connected by an elastic sleeve pin coupling 16; the connected parts of the other transmission shafts are connected by a rigid flange coupling.

The two suspension points for supporting the engine casing 1 are arranged symmetrically on both sides of the engine casing 1 .

The suspension point for supporting the transmission is located at the end of the transmission rear case 3 close to the transfer case front case 5, and the suspension point of the transfer case front case 5 is located at the end close to the transmission rear case 3, The suspension point of the transfer case rear case 5 is located at the end connected with the transfer case front case 5 .

Beneficial effects of the present invention:

In the present invention, due to the flexible connection between the transmission rear shell and the transition plate, the powertrain will form two relatively independent rigid bodies in Fig. 3, the engine and the transmission become the first independent rigid body, and the transition plate and the transfer box become another second Independent rigid body, the flexible (semi-rigid) connection between the first independent rigid body and the second independent rigid body is realized by bolts with rubber elastic bushings, so that the super-static problem of the suspension becomes the static indeterminate problem of two rigid bodies. Compared with the traditional scheme, due to the more reasonable suspension arrangement and the auxiliary supporting function of the flexible connection in the present invention, the cantilever lengths of the two rigid bodies (mainly the second independent rigid body) are significantly reduced, and their respective stiffnesses are significantly improved. The moment is greatly reduced, and the alternating load stress amplitude is greatly reduced. At the same time, an elastic sleeve pin coupling is used between the power output shaft of the transmission and the input shaft of the transfer case to compensate the relative displacement between the two rigid bodies caused by the flexible connection of the housing, and good results can be achieved.

The invention ensures the comfort and reliability of the four-wheel drive vehicle to the greatest extent while considering the economy and feasibility, and solves the problems of vibration of the power assembly and fatigue fracture of the three shells of the power assembly that cannot be overcome by traditional solutions.

The present invention can transform the super-statically indeterminate problem of the traditional powertrain mount into a statically indeterminate problem after reasonably selecting the stiffness of the mount components of the powertrain of different models, and can well solve the problem of the connection and suspension of the traditional powertrain. The tremor problem of the powertrain that cannot be overcome by the layout method can greatly reduce the variation range of the stress amplitude of the three shells of the powertrain while reducing vibration and noise, thereby reducing the incidence of fatigue fracture failures of the three shells and ensuring Vehicle comfort and reliability. The model that has been put into production adopts this plan to make almost no changes to the three-shell casting mold. It only needs to slightly repair the casting mold of the transition plate and replace some connecting parts and couplings. It has good economy and wide application range.

Description of drawings

Fig. 1 is a structural principle diagram of the power assembly arrangement of the present invention.

Fig. 2 is a structural schematic diagram of an existing powertrain arrangement.

Fig. 3 is a schematic diagram of two equivalent rigid bodies formed by the arrangement scheme of the present invention.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

Embodiment one.

As shown in Figures 1 and 3.

A powertrain arrangement method for a long-wheelbase four-wheel-drive vehicle. First, the engine casing with the engine mounted thereon is suspended on the vehicle frame through at least two points, and the two suspension points should be symmetrically distributed on both sides of the casing. At the same time, rigidly connect the engine casing to the front casing of the transmission, and rigidly connect the rear casing to the front casing of the transmission; secondly, suspend the transmission rigidly connected to the front and rear casings on the frame; thirdly, connect the rear casing of the transmission Flexible connection directly with the front case of the transfer case (a flexible connection can be formed by adding a rubber elastic bushing between the bolt and the mounting hole or other conventional connection methods, this connection method is actually a semi-rigid and semi-flexible connection ), and suspend the front case of the transfer case on the frame, and at the same time rigidly connect the front case of the transfer case to the rear case of the transfer case, and suspend the rear case of the transfer case on the frame; or make the transmission The rear shell is firstly connected to the transition plate flexibly (the flexible connection can be formed by installing a rubber elastic bushing between the bolt and the mounting hole or other conventional connection methods, this connection method is actually a semi-rigid and semi-flexible connection) , then rigidly connect the transition plate to the front case of the transfer case, suspend the front case of the transfer case on the frame, and then rigidly connect the rear case of the transfer case to the front case of the transfer case, so that the engine case, transmission The rigid body composed of the front case, the transmission rear case, the transfer case front case and the transfer case rear case is divided into two rigid bodies, as shown in Figure 3, rigid body 1 and rigid body 2 can reduce the length of a single rigid connector and reduce the dynamic load Bending moment and alternating load stress amplitude purposes. As shown in Figure 1, the power output shaft of the transmission and the input shaft of the transfer box are connected by an elastic sleeve pin coupling; the connected parts of the other drive shafts are connected by a rigid flange coupling.

Embodiment two.

As shown in Figures 1 and 3.

A long-wheelbase four-wheel-drive vehicle powertrain layout structure, which includes an engine housing 1 with an engine installed, a transmission front housing 2 and a transmission rear housing 3, and a transfer case front housing with a transition plate 4 installed. Case 5 and transfer case rear case 6. The engine case 1 is suspended on the vehicle frame at least through two suspension points symmetrically arranged on both sides of the engine case. The engine case 1 and the front case 2 of the transmission One end is rigidly connected by a bolt 7, and the other end of the transmission front case 2 and one end of the transmission rear case 3 are rigidly connected by a bolt 8. After the rigid connection, the transmission front case 2 and the transmission rear case 3 are suspended on a suspension of the vehicle frame. At least two suspension points between it and the engine casing will be a rigid body of the power system composed of the engine and transmission (equivalent to 1 in 3) is suspended on the vehicle frame; the transmission rear case 3 is connected with the transfer case front case 5 through the transition plate 4 with a flexible structure 10 (rubber elastic can be installed between the bolt and the mounting hole Bushing method to form a flexible connection or other conventional connection methods, this connection is actually a semi-rigid and semi-flexible connection), or directly connected to the front case 5 of the transfer case flexibly, the rear case 3 of the transmission is connected to the split case through the transition plate 4 When the transfer case front case 5 is flexibly connected, the transmission rear case 3 and one end of the transition plate 4 are connected by a flexible structure 10, and the other end of the transition plate 4 is rigidly connected with one end of the transfer case front case 5, and the transmission rear case 3 When directly connected to the transfer case front case 5 flexibly, the transmission rear case 3 and the transfer case front case 5 are connected by a flexible structure 10, and the transfer case front case 5 and the transfer case rear case 6 are rigidly connected , the transfer case front case 5 and the transfer case rear case 6 are suspended on the vehicle frame through their respective suspension points, and the rigidly connected transfer case front case 5 and the transfer case rear case 6 form the entire power Another rigid body of the system, the two rigid bodies are flexibly connected to form a whole, so as to reduce the length of a single rigid connection body, reduce the dynamic load bending moment and the amplitude of alternating dynamic load stress. The power output shaft of the transmission and the input shaft of the transfer box are connected by an elastic sleeve pin coupling 16; the connected parts of the other transmission shafts are connected by a rigid flange coupling. During specific implementation, the suspension point for supporting the transmission is located at the end of the transmission rear case 3 close to the front case 5 of the transfer case, and the suspension point of the front case 5 of the transfer case is located near the rear case 3 of the transmission case. On one end, the suspension point of the transfer case rear case 5 is located at the end connected with the transfer case front case 5 .

Fig. 1 is the principle diagram of the present invention, and it is made up of power assembly suspension system, three parts of power assembly shell connection and drive shaft connection.

The powertrain mount consists of engine left mount 11; engine right mount 12 (located symmetrically behind the left engine mount 11 at the position shown in the figure, and there are no less than 2 engine mount points, including 2); transmission mount Point 13; transfer case front suspension point 14; transfer case rear suspension point 15.

The three casings of the powertrain are connected, the engine casing 1 and the transmission front casing 2 are rigidly connected by bolts 7; the transmission front casing 2 and the transmission rear casing 3 are rigidly connected by bolts 8; Rubber elastic bushings are installed between them to form a flexible connection 10 (or other applicable types of flexible connection forms); the transfer case front case 5 and the transfer case rear case 6 are rigidly connected by bolts 9 .

The transmission shaft is connected, and the elastic sleeve pin coupling 4 (or other applicable type of elastic coupling) is used between the power output shaft of the transmission and the input shaft of the transfer case; the other connecting parts of the transmission shaft are rigid flange couplings ( or other applicable types of rigid couplings, not shown on the diagram).

The parts not involved in the present invention are the same as the prior art or can be realized by adopting the prior art.

The above-mentioned embodiments and accompanying drawings are only to describe the preferred implementation of the present invention, and are not intended to limit the concept and scope of the present invention. Various modifications and improvements made in the technical solution shall fall within the scope of protection of the present invention, and the technical content claimed in the present invention has been fully recorded in the claims.

Claims (9)

1. a long-wheelbase four-wheel-drive vehicle powertrain arrangement method is characterized in that it comprises the following steps: Firstly, suspend the engine casing with the engine mounted on the vehicle frame through at least two points, and at the same time rigidly connect the engine casing to the transmission front casing, and rigidly connect the transmission rear casing to the transmission front casing; Second, suspend the transmission rigidly connected to the front and rear shells on the frame; Thirdly, connect the rear case of the transmission directly to the front case of the transfer case, suspend the front case of the transfer case on the frame, and at the same time rigidly connect the front case of the transfer case to the rear case of the The rear case of the transmission is suspended on the frame; or the rear case of the transmission is flexibly connected to the transition plate, and then the transition plate is rigidly connected to the front of the transfer case, and then the front case of the transfer case is suspended on the frame. Then the rear case of the transfer case is rigidly connected with the front case of the transfer case, so that the rigid body composed of the engine case, the front case of the transmission, the rear case of the transmission, the front case of the transfer case and the rear case of the transfer case is divided into two rigid bodies. Body, to achieve the purpose of reducing the length of a single rigid connection body, reducing the dynamic load bending moment and alternating load stress amplitude. 2. The method according to claim 1, characterized in that the flexible connection is formed by installing a rubber elastic bushing between the bolt and the mounting hole. 3. The method according to claim 1, characterized in that the power output shaft of the transmission and the input shaft of the transfer case are connected by an elastic sleeve pin coupling; the connected parts of the remaining drive shafts are connected by a rigid flange Shaft connected. 4. The method according to claim 1, characterized in that the two suspension points supporting the engine casing are arranged symmetrically on both sides of the engine casing. 5. A powertrain arrangement structure of a long-wheelbase four-wheel drive vehicle, which includes an engine housing (1) with an engine installed, a transmission front housing (2) with a transmission installed, a transmission rear housing (3), and a The transfer case front case (5) and the transfer case rear case (6) of the transition plate (4) are characterized in that the engine casing (1) is suspended on the vehicle frame through at least two suspension points, The engine housing (1) is rigidly connected to one end of the transmission front housing (2), the other end of the transmission front housing (2) is rigidly connected to one end of the transmission rear housing (3), and the rigidly connected transmission front housing (2) is connected to The transmission rear case (3) is suspended on a suspension point of the vehicle frame, and at least two suspension points between it and the engine casing suspend a power system rigid body composed of the engine and the transmission on the vehicle frame; The transmission rear case (3) is flexibly connected with the transition plate (4) installed on the transfer case front (5) or directly connected with the transfer case front case (5), and the transmission rear case (3) passes through the transition plate ( 4) When flexibly connected with the transfer case front case (5), the transmission rear case (3) and one end of the transition plate (4) are connected by a flexible structure (10), and the other end of the transition plate (4) is connected to the transfer case Rigid connection between one end of the front case of the transmission (5); when the rear case of the transmission (3) is directly connected with the front case of the transfer case (5) flexibly, the connection between the rear case of the transmission (3) and the front case of the transfer case (5) The flexible structure (10) is used to connect, and the transfer case front case (5) and the transfer case rear case (6) are rigidly connected. The transfer case front case (5) and the transfer case rear case (6) ) are suspended on the vehicle frame through their respective suspension points, and the rigidly connected transfer case front case (5) and transfer case rear case (6) form another rigid body of the entire power system. The joints are flexibly connected as a whole to achieve the purpose of reducing the length of a single rigid connection, reducing the dynamic load bending moment and the amplitude of alternating load stress. 6. The structure according to claim 5, characterized in that the flexible structure (10) is a flexible connection of bolts with rubber elastic bushings. 7. The structure according to claim 5, characterized in that the power output shaft of the transmission and the input shaft of the transfer box are connected by an elastic sleeve pin coupling (16); Flange coupling connected. 8. The structure according to claim 5, characterized in that the two suspension points supporting the engine casing (1) are arranged symmetrically on both sides of the engine casing (1). 9. The structure according to claim 5, characterized in that the suspension point for supporting the transmission is located at the end of the rear case (3) of the transmission close to the front case (5) of the transfer case, and the transfer case The suspension point of the front case (5) is located at the end close to the transmission rear case (3), and the suspension point of the transfer case rear case (5) is located at the end connected with the transfer case front case (5) superior.

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