CN108819696A - The longitudinal automobile power assembly of hydraulic mount after a kind of band - Google Patents

Abstract

The invention discloses a longitudinal automobile power assembly with a rear hydraulic mount, which comprises an engine and a gearbox which are integrally connected in the axial direction. A rear suspension installation beam is arranged horizontally, the axis of the gearbox is perpendicular to the rear suspension installation beam, and the rear end of the gearbox is fixed on the rear suspension installation beam by hydraulic suspension. The beneficial effect of the present invention is that the traditional rubber mount is replaced by the hydraulic mount, which can increase the rigidity in the low-frequency environment and reduce the rigidity in the high-frequency environment, so as to achieve good NVH performance of the vehicle.

Description

A longitudinal vehicle powertrain with rear hydraulic mount

technical field

The invention belongs to the field of automobile structure design, in particular to a longitudinal automobile power assembly with a rear hydraulic mount.

Background technique

For traditional cars, the powertrain, including the engine and gearbox, is the core component of the car. The layout of the powertrain can be roughly divided into two types: horizontal and vertical. The horizontal arrangement is to arrange the powertrain in the cabin along the Y direction, which is generally applicable to models with small engines and gearboxes. The vertical arrangement is to arrange the engine and gearbox in the engine room along the X direction. Because of the large space in this arrangement, it can fully meet the layout requirements of large-sized engines and gearboxes, so it is often used in medium and large vehicles or On luxury cars. In the longitudinal layout, the front end of the powertrain is fixed on the front suspension installation beam through the front suspension, and the rear end needs to be fixed on the rear suspension installation beam through the rear suspension. The suspension is an automotive powertrain used to reduce and control the transmission of engine vibration and play a supporting role. The traditional rear suspension structure generally uses a suspension device made of rubber as an elastic material, such as "a rear suspension cushion assembly for an engine" disclosed in Chinese patent document CN201818707U on May 4, 2011 Introduced, including the inner frame (1) connected with the engine, the inner frame (1) is vulcanized into an integrated structure through the rubber body (4) and the steel plate (3), the steel plate (3) is connected with the outer frame (2), and the steel plate ( 3) It is fixed on the bottom surface of the outer frame (2) by buckles, and the outer frame (2) is fixed on the frame by bolts. The cushion assembly is at a certain angle of inclination. It maintains a parallelogram state during assembly and a rectangular state after preloading. . Such traditional solutions, due to the use of rubber mounts, have relatively low stiffness in the X/Y direction, which is not conducive to the roll and yaw resistance of the rear half of the powertrain, so it cannot meet the large damping required by the low-frequency large displacement of the powertrain High stiffness and high frequency provide the effect of small damping and low stiffness, which makes the NVH performance of the vehicle poor.

Contents of the invention

Based on the above problems, the present invention provides a longitudinal vehicle powertrain with a rear hydraulic mount, which replaces the traditional rubber mount with a hydraulic mount, which can increase stiffness in a low-frequency environment and reduce stiffness in a high-frequency environment, realizing vehicle Good NVH performance.

In order to achieve the purpose of the invention, the present invention adopts the following technical solutions: a longitudinal vehicle power assembly with a rear hydraulic mount, including an engine and a gearbox that are integrally connected rigidly in the axial direction, and the front end of the engine is arranged at the front end of the engine room. The rear end in the nacelle is horizontally provided with a rear suspension installation crossbeam along the left and right directions, the axis of the gearbox is perpendicular to the rear suspension installation crossbeam, and the rear end of the gearbox is fixed on the rear suspension installation crossbeam by a hydraulic mount.

A longitudinal vehicle powertrain with rear hydraulic mount designed in this scheme changes the traditional rubber mount into hydraulic mount. An ideal dynamic suspension system should have the following two characteristics: In the low frequency range of 5-20Hz, in order to effectively attenuate the low-frequency and large-amplitude vibration caused by uneven road surface and uneven engine idling gas pressure, it needs to have high stiffness, large The characteristics of damping; in the frequency range above 20 Hz, in order to reduce the noise inside the car and improve the handling stability of the car, it needs to have the characteristics of low stiffness and small damping. The hydraulic mount overcomes the limitation of small damping of the traditional rubber mount, and can better meet the vibration isolation requirements of the automotive powertrain. Because the hydraulic mount has the characteristics of large low-frequency damping, small high-frequency dynamic stiffness, and more ideal vibration and noise reduction, the use of hydraulic mounts in this scheme can increase stiffness in low-frequency environments and reduce stiffness in high-frequency environments. Achieve good vehicle NVH performance. In addition, the stiffness and height of the hydraulic mount can be adjusted, so it is not only suitable for the initial assembly of the original factory, but also for experienced drivers, they can adjust the amount of oil in the hydraulic mount by themselves in the later stage to meet Different vehicle handling needs. It should be noted that the powertrain mentioned here only includes the engine and gearbox, but in pure electric vehicles, since there is no engine and gearbox, it is not included.

Preferably, the number of said hydraulic mounts is not less than 2, and they are arranged equidistantly in the length direction of the rear suspension mounting beam. Considering the large total mass of the powertrain, multiple hydraulic mounts are provided for use, which also stabilizes the rear end of the powertrain.

Preferably, the number of said hydraulic mounts is 2; centered on the intersection of the horizontal projection of the gearbox axis and the axis of the rear suspension mounting beam, they are symmetrically arranged in the length direction of the rear suspension mounting beam. This is a stability setting. The hydraulic mounts are respectively arranged on both sides in the length direction of the rear suspension mounting crossbeam, so that the rear end of the gearbox can be stably located directly above the connecting line of the two hydraulic mounts.

Preferably, the rear end of the gearbox is fixed with a suspension mounting bracket; the suspension mounting bracket is provided with a gearbox side mounting plate, and the gearbox side mounting plate is adapted to be fixed against the rear end of the gearbox; the bottom of the gearbox side mounting plate is provided with Hydraulic mount connecting feet, the upper ends of the hydraulic mounts are connected and fixed with the hydraulic mount connecting feet in one-to-one correspondence. It is difficult to directly fix the hydraulic mount on the rear end of the gearbox, so the mount mounting bracket is introduced in this solution. The suspension mounting bracket is a transfer mechanism with a transmission side mounting plate and a hydraulic suspension connection foot. It can be connected with the upper end of the hydraulic mount in one-to-one correspondence, so that the rear end of the gearbox can be well connected and fixed with the rear suspension installation beam through the hydraulic mount.

As a preference, the hydraulic mount connecting foot is provided with a longitudinal connecting plate extending along the force direction of the hydraulic mount. Mounting holes are arranged on the plate, and the mounting rod at the top of the hydraulic suspension passes through the mounting holes from bottom to top, and is fastened to the horizontal connecting plate by fasteners. This scheme defines the shape of the hydraulic mount connecting foot and its specific connection mode with the hydraulic mount.

Preferably, the number of longitudinal connecting plates is 3, which are respectively arranged in the direction of the front end of the gearbox and the direction of both ends of the rear suspension mounting beam; the lower ends of each longitudinal connecting plate are respectively connected to the corresponding sides of the transverse connecting plate. The use of three longitudinal connecting plates can increase the longitudinal strength of the hydraulic suspension connecting feet, and facilitate the operation of the upper fastening of the horizontal connecting plates.

Preferably, adjacent longitudinal connecting plates are connected and fixed to each other laterally. This further improves the strength of the longitudinal connecting plate and further improves the longitudinal supporting strength of the hydraulic suspension connecting foot.

To sum up, the beneficial effect of the present invention is that the traditional rubber mount is replaced by the hydraulic mount, which can increase the stiffness in a low-frequency environment and reduce the stiffness in a high-frequency environment, so as to achieve a good NVH performance of the vehicle.

Description of drawings

Fig. 1 is a structural schematic diagram of the present invention.

Fig. 2 is an enlarged view of part A of Fig. 1 .

Among them: 2 Rear suspension mounting beam, 3 Hydraulic mounting, 4 Mounting bracket, 31 Mounting rod, 41 Gearbox side mounting plate, 42 Hydraulic mounting connecting foot, 98 Gearbox, 99 Engine, 421 Longitudinal connecting plate, 422 horizontal connecting plate, 423 mounting holes.

Detailed ways

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

The embodiment shown in Fig. 1 and Fig. 2 is a longitudinal vehicle power assembly with a rear hydraulic mount.

A longitudinal vehicle power assembly with a rear hydraulic mount in this example mainly includes an engine 99 and a gearbox 98 rigidly connected in an axial direction, as well as a rear mount beam 2 and a hydraulic mount 3 . The powertrain in this example is longitudinally mounted, the engine is located in front of the engine room, and the gearbox is located behind the engine. The two can be regarded as a whole with rigid connection. At the rear of the engine compartment, there is a rear suspension installation beam along the left and right direction of the vehicle body, but the horizontal position of the rear suspension installation beam is slightly lower than the horizontal position of the transmission axis, and the transmission axis is in line with the rear suspension. The extension direction of the mounting beam is vertical.

A suspension mounting bracket 4 is fixed at the rear end of the gearbox. The suspension mounting bracket includes a transmission side mounting plate 41, which is adapted to be fixed close to the rear end of the transmission; two hydraulic suspension connecting feet 42 are arranged below the transmission side mounting plate, and the hydraulic suspension The upper ends are connected and fixed with the hydraulic suspension connecting feet in one-to-one correspondence. And take the intersection point of the horizontal projection of the gearbox axis and the axis of the rear suspension mounting beam as the center, and arrange symmetrically in the length direction of the rear suspension mounting beam.

Each hydraulic suspension connection foot includes a longitudinal connection plate 421 and a transverse connection plate 422 . There are three longitudinal connecting plates, all of which extend along the force direction of the hydraulic mount, and are respectively set in the direction of the front end of the gearbox and the direction of both ends of the rear suspension mounting beam; the upper ends of the longitudinal connecting plates are fixed with the gearbox side mounting plate, and the lower ends are respectively Connect with the corresponding side of the horizontal connecting plate. Adjacent longitudinal connecting plates are connected and fixed to each other laterally. The extension direction of the horizontal connecting plate is parallel to the force direction of the hydraulic mount; the horizontal connecting plate is provided with a mounting hole 423, and the mounting rod 31 at the top of the hydraulic mount passes through the mounting hole from bottom to top, and is fastened to the horizontal connecting plate with fasteners. solid.

Claims (7)

1. the longitudinal automobile power assembly of hydraulic mount after a kind of band, the engine including axial upper rigid unitary connection（99）With Gearbox（98）, the front end of engine is set to the front end in cabin, and the rear end in cabin is horizontally disposed in left-right direction rear overhang Set installation crossbeam（2）, the axis of gearbox is perpendicular to rear-suspending installation crossbeam, characterized in that the rear end of gearbox passes through hydraulic Suspension（3）It is fixed on rear-suspending installation crossbeam.

2. the longitudinal automobile power assembly of hydraulic mount after a kind of band according to claim 1, characterized in that described hydraulic The quantity of suspension is no less than 2, is arranged on the length direction of rear-suspending installation crossbeam in equidistant mode.

3. the longitudinal automobile power assembly of hydraulic mount after a kind of band according to claim 2, characterized in that described hydraulic The quantity of suspension is 2；Centered on the intersection point of the floor projection of the axis of gearbox and rear-suspending installation crossbeam axis, rear It is arranged symmetrically on the length direction of suspension installation crossbeam.

4. the longitudinal automobile power assembly of hydraulic mount after a kind of band according to claim 1 or 2 or 3, characterized in that become Fast box back is fixed with suspension mounting bracket（4）；Suspension mounting bracket is equipped with gear-box side mounting plate（41）, gear-box side installation Plate adaptation is close to speed change box back and is fixed；The lower section of gear-box side mounting plate is equipped with hydraulic mount connecting pin（42）, hydraulic mount Upper end be connected and fixed correspondingly with hydraulic mount connecting pin.

5. the longitudinal automobile power assembly of hydraulic mount, hydraulic mount connecting pin are set after a kind of band according to claim 4 There is the vertical connecting plate extended along hydraulic mount Impact direction（421）, indulge connecting plate lower end and be equipped with horizontal connecting plate（422）, horizontal connection The extending direction of plate is parallel to hydraulic mount Impact direction；Horizontal connecting plate is equipped with mounting hole（423）, the peace on hydraulic mount top Fill bar（31）Mounting hole is passed through from bottom to top, and is fastened with fastener and horizontal connecting plate.

6. the longitudinal automobile power assembly of hydraulic mount after a kind of band according to claim 5, characterized in that vertical connecting plate Quantity be 3, be respectively arranged on extreme direction and rear-suspending installation crossbeam direction of both ends before power assembly；Under each vertical connecting plate End side connection corresponding with horizontal connecting plate respectively.

7. the longitudinal automobile power assembly of hydraulic mount after a kind of band according to claim 6, characterized in that adjacent is vertical Connecting plate is in the fixation that is laterally connected to each other.