An engine mount

Abstract

A novel engine suspension includes a housing, an upper end cover detachably connected to the housing, a hydraulic device, and an intermediate channel body arranged on the inner wall of the housing, wherein the outer edge of the intermediate channel body abuts against the inner wall of the housing in the circumferential direction, and the center of the intermediate channel body is provided with a central hole arranged through it, and the lower end of the housing is connected to a support frame at the bottom through a rubber element. The novel engine suspension, through the arrangement of the suspension structure, arranges the intermediate channel body and the hydraulic piston inside the suspension housing, so that the vibration of the engine at different amplitudes and vibration frequencies can be effectively reduced, and the vibration transmitted from the engine to the frame is reduced to the minimum. The suspension integrates air damping vibration reduction, screen vibration reduction, oil-gas diaphragm vibration reduction, rubber vibration reduction, and torsion bar vibration reduction, and can achieve the screen to reduce small amplitude vibration, and the rubber oil-gas diaphragm and torsion bar spring to reduce large amplitude vibration.

Description

Technical Field

[0001] The invention belongs to the technical field of engine suspension, and in particular relates to an engine suspension. Background Art

[0002] A car is a multi-mass system composed of multiple mass bodies, elastic bodies and dampers. The engine is a major vibration source on the car, and its vibration is transmitted from the powertrain to the frame or body through the suspension system. The engine mount is installed between the engine and the chassis of the car to support the powertrain and isolate the engine vibration energy from being transmitted to the chassis and body. A good engine mount can effectively reduce the vibration and noise level of the entire car, effectively improve the ride comfort of the car, and extend the service life of the engine and other components.

[0003] The existing engine mount generally has a good vibration isolation effect. However, the mount stiffness is small and the limiting capacity is insufficient. When the car is greatly bumped, the engine mount device cannot effectively reduce the large displacement of the engine due to inertia. Eventually, the powertrain itself collides with the surrounding parts and is damaged. At the same time, the mount device is also easily damaged. Reducing the impact of the vibration of the engine mount on the whole vehicle and limiting the amount of jitter play a very important role in the NVH performance (noise, vibration and harshness) of the whole vehicle. Summary of the invention

[0004] The object of the present invention is to provide an engine mount to reduce the vibration of the mount in view of the above-mentioned deficiencies in the prior art.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] The engine suspension comprises a shell, an upper end cover detachably connected to the shell, a hydraulic device and an intermediate channel body arranged on the inner wall of the shell, wherein the outer edge of the intermediate channel body abuts against the inner wall of the shell along the circumferential direction, and a central hole is arranged through the center of the intermediate channel body, and the lower end of the shell is connected to a support frame at the bottom through a rubber element.

[0007] A connecting bracket is provided at the upper end of the hydraulic device, and the connecting bracket is located outside the upper end cover. A hydraulic piston is provided at the lower end of the hydraulic device. The hydraulic piston passes through the upper end cover and the outer edge of the hydraulic piston abuts against the inner wall of the shell. The upper part of the hydraulic piston and the upper end cover form a gas chamber; a vent is also provided on the upper end cover, and a pneumatic solenoid valve for controlling the opening and closing of the vent is provided at the vent.

[0008] The intermediate channel body includes an upper intermediate channel body and a lower intermediate channel body which are stacked, and a screen is provided at the center hole between the upper intermediate channel body and the lower intermediate channel body; a plurality of hydraulic oil channels are also penetrated through the central channel body, and the hydraulic oil channels include an extension valve channel and a compression valve channel which are symmetrically distributed along the center of the intermediate channel body, and the extension valve channel and the compression valve channel are alternately arranged; an extension valve spring sheet is mounted on the upper surface of the upper intermediate channel body, and the movable end of the extension valve spring sheet covers the extension valve channel and can move up and down; a compression valve spring sheet is mounted on the lower surface of the lower intermediate channel body, and the movable end of the compression valve spring sheet covers the compression valve channel and can move up and down; the upper part of the intermediate channel body and the lower part of the hydraulic piston constitute an upper liquid chamber.

[0009] It also includes a rubber oil-gas diaphragm, which is arranged below the middle channel body and sealed with the rubber element. The rubber oil-gas diaphragm and the rubber element form a high-pressure sealing cavity, and high-pressure gas passes through the high-pressure sealing cavity, while the rubber oil-gas diaphragm and the middle channel body form a lower liquid cavity.

[0010] A buffer limit block for limiting the upward movement of the hydraulic piston is also provided below the upper end cover.

[0011] The high-pressure sealed cavity is filled with 2-3 MPa compressed nitrogen.

[0012] The rubber oil-gas diaphragm and the rubber element are integrated by vulcanization sealing.

[0013] The hydraulic oil passages are four, and the extension valve passages and the compression valve passages are two respectively.

[0014] The rubber element is a hollow U-shaped cone rubber pile, and its material is polybutadiene rubber or isoprene rubber.

[0015] The thickness of the rubber body at the bottom of the U-shaped cone of the rubber element is thicker than the thickness of the rubber body at the connection between the rubber element and the side wall of the shell.

[0016] The support frame is connected to the vehicle frame through a torsion bar spring, one end of the torsion bar spring is assembled and connected to the support frame, and the other end is fixed on the vehicle frame.

[0017] The torsion bar spring is made of alloy spring steel, and its surface is coated with epoxy resin.

[0018] The beneficial effects of the present invention are:

[0019] 1) Engine suspension: through the layout of the suspension structure, the intermediate channel body and the hydraulic piston are arranged inside the suspension shell, so that the vibration of the engine at different amplitudes and vibration frequencies can be effectively reduced, and the vibration transmitted from the engine to the frame is reduced to a minimum. The suspension integrates air damping vibration reduction, screen vibration reduction, oil-gas diaphragm vibration reduction, rubber vibration reduction, and torsion bar vibration reduction. It can achieve the screen to reduce small-amplitude vibration, and the rubber oil-gas diaphragm and torsion bar spring to reduce large-amplitude vibration.

[0020] 2) The stretching and contraction between the nylon screen wires in the middle channel body helps to reduce high-frequency vibrations, and the high-pressure sealing cavity helps to eliminate the dynamic hardening phenomenon in the flow channel of the middle channel body.

[0021] 3) The pneumatic solenoid valve automatically opens and closes the vent hole on the upper end cover according to the vibration conditions, with a high degree of automation, which improves the adaptability of the suspension vibration reduction.

[0022] 4) Existing suspensions can often only reduce vibrations in a single direction. The cylindrical rubber element of the suspension has a good effect on reducing vibrations in different directions. The torsion bar spring can also reduce longitudinal force and vertical force to a certain extent, which is of great significance for ensuring the reliability of the suspension and extending the service life of the suspension. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the structure of the present invention;

[0024] Figure 2 It is a schematic diagram of the structure of the intermediate channel body;

[0025] Figure 3 yes Figure 2 AA section view;

[0026] Figure 4 yes Figure 2 BB section view. DETAILED DESCRIPTION

[0027] The following is a description of the implementation of the present invention by means of specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0028] The present invention provides an engine mount, such as Figures 1 to 4 shown.

[0029] The engine suspension includes a shell 1, an upper end cover 2 detachably connected to the shell 1, a hydraulic device, and an intermediate channel body 4 arranged on the inner wall of the shell 1, the side wall of the intermediate channel body 4 abuts against the inner wall of the shell 1 along the circumferential direction, and the center of the intermediate channel body 4 is provided with a central hole arranged through it, and the lower end of the shell 1 is connected to the bottom support frame 6 through a rubber element 5.

[0030] A connecting bracket 31 is provided at the upper end of the hydraulic device, and the connecting bracket 31 is located outside the upper end cover 2. A hydraulic piston 32 is provided at the lower end of the hydraulic device. The hydraulic piston 32 passes through the upper end cover 2 and the outer edge of the hydraulic piston 32 abuts against the inner wall of the housing 1. The upper part of the hydraulic piston 32 and the upper end cover 2 form a gas chamber 11, and the upper part of the intermediate channel body 4 and the lower part of the hydraulic piston 32 form an upper liquid chamber 12. A vent hole 21 is also provided on the upper end cover 2, and a pneumatic solenoid valve 22 for controlling the opening and closing of the vent hole is provided at the vent hole 21. A buffer stopper 23 for limiting the upward movement of the hydraulic piston 32 is also provided below the upper end cover 2 to ensure that the suspension protects the hydraulic piston 32 from generating a rigid impact with the upper end cover 2 when it is subjected to severe vibration. Preferably, a piston ring is provided on the hydraulic piston 32 to ensure the sealing between it and the inner wall of the suspension housing 1. In this embodiment, the engine suspension is set to be cylindrical, and the connecting bracket 31 bears the longitudinal force of the engine.

[0031] The middle channel body 4 includes an upper middle channel body 41 and a lower middle channel body 42 which are stacked, and the upper middle channel body 41 and the lower middle channel body 42 are disc-shaped with the same outer diameter and inner diameter, and a screen 9 is installed at the center hole between the upper middle channel body 41 and the lower middle channel body 42. In this embodiment, the screen 9 is a nylon screen, and the outer edge of the nylon screen cannot be deformed under the clamping action of the upper middle channel body 41 and the lower middle channel body 42, while the nylon screen can achieve a certain deformation when located in the center hole. The nylon screen has a very high bearing strength, and has good wear resistance, fatigue resistance, corrosion resistance, and reliability. A plurality of hydraulic oil channels are also provided through the center channel body, and the hydraulic oil channels include an extension valve channel 43 and a compression valve channel 44 which are symmetrically distributed along the center of the middle channel body, and the extension valve channel 43 and the compression valve channel 44 are alternately arranged. Preferably, the hydraulic oil channels are provided with four, and the extension valve channel 43 and the compression valve channel 44 are provided with two respectively.

[0032] An extension valve spring sheet 431 is mounted on the upper surface of the upper intermediate channel body 41, and the movable end of the extension valve spring sheet 431 covers the extension valve channel 43 and can move up and down to control the flow and cutoff of the fluid in the extension valve channel 43; a compression valve spring sheet 441 is mounted on the lower surface of the lower intermediate channel body 42, and the movable end of the compression valve spring sheet 441 covers the compression valve channel 44 and can move up and down to control the flow and cutoff of the fluid in the compression valve channel 44. The extension valve spring sheet 431 and the compression valve spring sheet 441 have variable stiffness during the deformation process driven by the fluid pressure. When the fluid flow rate is low and the pressure is low, the spring deformation is small and the stiffness is small; when the fluid flow rate is high and the pressure is high, the spring deformation is large and the spring stiffness is large.

[0033] It also includes a rubber oil-gas diaphragm 7, which is arranged below the middle channel body 4 and sealed with the rubber element 5. Preferably, the rubber oil-gas diaphragm 7 and the rubber element 5 are integrated by vulcanization sealing to ensure the sealing effect, and the rubber oil-gas diaphragm 7 divides the inner cavity on the lower side of the middle channel body 4 into two parts. The rubber oil-gas diaphragm 7 and the middle channel body 4 constitute a lower liquid cavity 13, and the rubber oil-gas diaphragm 7 and the rubber element 5 constitute a high-pressure sealing cavity 14, and the high-pressure sealing cavity 14 is filled with high-pressure gas. In this embodiment, the high-pressure sealing cavity 14 is filled with 2~3MPa compressed nitrogen.

[0034] The rubber element 5 is a hollow U-shaped cone rubber pile, and its material is polybutadiene rubber or isoprene rubber. Preferably, the thickness of the rubber body at the bottom of the U-shaped cone of the rubber element 5 is thicker than the thickness of the rubber body at the connection between the rubber element 5 and the side wall of the housing 1, so that when the rubber element 5 is compressed and sheared at the same time, it can meet the requirements of vibration reduction in the vertical, longitudinal and transverse directions.

[0035] A support frame 6 is provided at the bottom of the rubber element 5. In this embodiment, the rubber element 5 and the housing 1, as well as the rubber element 5 and the support frame 6 at the bottom of the housing 1 are fixedly connected by vulcanization to ensure that no relative displacement occurs during vibration. The support frame 6 is used to support the longitudinal force of the suspension. The support frame 6 is connected to the frame through a torsion bar spring 8, and one end of the torsion bar spring 8 is assembled and connected to the support frame 6, and the other end is fixed to the frame; the cross-section of the torsion bar spring 8 can be rectangular, and the torsion bar spring 8 is made of alloy spring steel, such as chrome-vanadium alloy spring steel coated with epoxy resin on the surface, to improve its service life.

[0036] The working principle of the engine mount is as follows:

[0037] The pneumatic solenoid valve 22 on the lower side of the upper end cover 2 can realize automatic control of the opening and closing of the vent hole 21. When low-frequency and large-amplitude vibration occurs, the pneumatic solenoid valve 22 closes the vent hole, and the gas cavity 11 between the hydraulic piston 32 and the upper end cover 2 is sealed, and the stiffness of the upper liquid cavity 12 increases accordingly, and the dynamic stiffness increases; when high-frequency and small-amplitude vibration occurs, the pneumatic solenoid valve 22 opens the vent hole 21, and the gas cavity 11 between the hydraulic piston 32 and the upper end cover 2 remains connected to the atmospheric pressure, the stiffness of the upper liquid cavity 12 decreases, and the dynamic stiffness decreases.

[0038] The connecting bracket 31 on the top of the shell 1 bears the longitudinal force from the engine and transmits the force to the hydraulic piston 32; the upper liquid chamber between the hydraulic piston 32 and the intermediate channel body 4, under the action of the longitudinal force of the hydraulic piston 32, the fluid in the upper liquid chamber 12 and the lower liquid chamber 13 can flow through the intermediate channel body 4.

[0039] When the hydraulic piston 32 moves upward, the volume of the upper liquid chamber 12 increases, the compression valve spring sheet 441 is closed, the extension valve spring sheet 431 is opened, and the fluid in the lower liquid chamber 13 enters the upper liquid chamber 12 through the extension valve channel 43 on the intermediate channel body 4 to overcome the force of the extension valve spring sheet 431 and the pores of the nylon screen; when the hydraulic piston 32 moves downward, the volume of the upper liquid chamber 12 decreases, the extension valve spring sheet 431 is closed, the compression valve spring sheet 441 is opened, and the fluid in the upper liquid chamber 12 enters the lower liquid chamber 13 through the compression valve channel 44 on the intermediate channel body 4 to overcome the force of the compression valve spring sheet 441 and the pores of the nylon screen.

[0040] The stiffness of the spring sheet changes during the deformation process as the fluid pressure acts on it. When the fluid flow rate is low and the pressure is low, the spring deformation is small and the stiffness is low; when the fluid flow rate is high and the pressure is high, the spring deformation is large and the stiffness is large.

[0041] When the vibration amplitude is large and the excitation frequency is low, under the combined action of the hydraulic piston force and the pressure in the high-pressure sealing chamber, the fluid between the upper liquid chamber 12 and the lower liquid chamber 13 mainly flows through the compression valve channel 44 and the extension valve channel 43; the fluid generates flow resistance during the circulation process in the compression valve channel 44 and the extension valve channel 43, consuming vibration energy.

[0042] When the vibration amplitude is small and the excitation frequency is high, the fluid flowing through the compression valve channel 44 and the extension valve channel 43 produces a dynamic hardening phenomenon. At this time, the nylon screen can achieve a certain amplitude of longitudinal vibration. During the vibration process, the stretching and contraction between the nylon screen wires produce a certain friction to reduce the vibration. At the same time, the nylon screen pores also allow a part of the fluid to flow. When the fluid passes through the nylon screen pores, flow friction is generated, further consuming vibration energy.

[0043] The rubber oil-gas diaphragm 7 separates the fluid in the lower liquid chamber 13 from the high-pressure nitrogen in the high-pressure sealing chamber 14. During operation, the rubber oil-gas diaphragm 7 always maintains a certain elasticity and acts like an air spring. When low-frequency and large-amplitude vibration occurs, the high-pressure sealing chamber 14 maintains a certain damping characteristic to reduce vibration; when high-frequency and small-amplitude vibration occurs, the high-pressure sealing chamber 14 helps to eliminate the dynamic hardening phenomenon of the fluid between the compression valve channel 44 and the extension valve channel 43.

[0044] The rubber element 5 at the bottom of the suspension may undergo compression deformation and shear deformation simultaneously during vibration, which can reduce large-amplitude vibrations in the vertical, longitudinal and lateral directions; and the torsion bar spring 8 is connected to the support frame 6 at one end and fixed to the frame at the other end. It has a rectangular cross-sectional shape and undergoes longitudinal deformation or lateral deformation when the suspension is subjected to a large longitudinal force or lateral force to further reduce vibration.

[0045] The engine suspension is arranged by arranging the suspension structure, arranging the intermediate channel body and the hydraulic piston inside the suspension shell, so that the vibration of the engine at different amplitudes and vibration frequencies can be effectively reduced, and the vibration transmitted from the engine to the frame is reduced to a minimum; the existing suspension technology is usually pure hydraulic vibration reduction or pure rubber vibration reduction, which has a limited scope of application for vibration reduction, while the suspension integrates air damping vibration reduction, screen vibration reduction, oil-gas diaphragm vibration reduction, rubber vibration reduction, and torsion bar vibration reduction, which can achieve the screen to reduce small amplitude vibration, and the rubber oil-gas diaphragm and torsion bar spring to reduce large amplitude vibration; the intermediate channel body The stretching and contraction between the nylon screen wires helps to reduce high-frequency vibrations, and the high-pressure sealing chamber helps to eliminate the dynamic hardening phenomenon in the flow channel of the intermediate channel body; the pneumatic solenoid valve automatically opens and closes the vent holes of the upper end cover according to the vibration conditions, with a high degree of automation, which improves the adaptability of the suspension vibration reduction; in addition, the existing suspension can often only reduce vibrations in a single direction, and the cylindrical rubber element of the suspension has a good effect on reducing vibrations in different directions. The torsion bar spring can also reduce the longitudinal force and vertical force to a certain extent, which is of great significance for ensuring the reliability of the suspension and extending the service life of the suspension.

[0046] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the invention claimed for protection. The scope of protection claimed for the present invention is defined by the attached claims and their equivalents.

[0047] In the description of the present invention, it is necessary to understand that the terms "front", "rear", "left", "right", "center", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the protection content of the present invention.

Claims

1. An engine mount, characterized in that: The hydraulic system comprises a housing, an upper end cover detachably connected to the housing, a hydraulic device, and an intermediate channel body provided on the inner wall of the housing. The outer edge of the intermediate channel body abuts against the inner wall of the housing along the circumferential direction, and a central hole is provided in the center of the intermediate channel body. The lower end of the housing is connected to the support frame at the bottom via a rubber element. The upper end of the hydraulic device is provided with a connecting bracket, and the connecting bracket is located outside the upper end cover. The lower end of the hydraulic device is provided with a hydraulic piston, which passes through the upper end cover and the outer edge of the hydraulic piston abuts against the inner wall of the shell. The upper part of the hydraulic piston and the upper end cover form a gas chamber. The upper end cover is also provided with a vent hole, and a pneumatic solenoid valve for controlling the opening and closing of the vent hole is provided at the vent hole. The intermediate channel body includes an upper intermediate channel body and a lower intermediate channel body arranged in a stacked manner, and a screen is provided at the center hole between the upper intermediate channel body and the lower intermediate channel body; a plurality of hydraulic oil channels are also provided through the central channel body, and the hydraulic oil channels include an expansion valve channel and a compression valve channel symmetrically distributed along the center of the intermediate channel body, and the expansion valve channels and the compression valve channels are arranged alternately; an expansion valve spring sheet is mounted on the upper surface of the upper intermediate channel body, and the movable end of the expansion valve spring sheet covers the expansion valve channel and can move up and down; a compression valve spring sheet is mounted on the lower surface of the lower intermediate channel body, and the movable end of the compression valve spring sheet covers the compression valve channel and can move up and down; the upper part of the intermediate channel body and the lower part of the hydraulic piston form an upper liquid chamber; It also includes a rubber oil-gas diaphragm, which is arranged below the middle channel body and is sealed with the rubber element. The rubber oil-gas diaphragm and the rubber element form a high-pressure sealing cavity, and the high-pressure sealing cavity is filled with high-pressure gas, and the rubber oil-gas diaphragm and the middle channel body form a lower liquid cavity; The support frame is connected to the vehicle frame through a torsion bar spring, and one end of the torsion bar spring is assembled and connected to the support frame, and the other end is fixed to the vehicle frame; The torsion bar spring is made of alloy spring steel, and its surface is coated with epoxy resin.

2. The engine mount according to claim 1, characterized in that: A buffer limit block for limiting the upward movement of the hydraulic piston is also provided below the upper end cover.

3. The engine mount according to claim 1, characterized in that: The high-pressure sealed cavity is filled with compressed nitrogen at a pressure of 2-3 MPa.

4. The engine mount according to claim 1, characterized in that: The rubber oil-gas diaphragm and the rubber element are integrated by vulcanization sealing.

5. The engine mount according to any one of claims 1 to 4, characterized in that: There are four hydraulic oil channels, and two extension valve channels and two compression valve channels respectively.

6. The engine mount according to claim 5, characterized in that: The rubber element is a hollow U-shaped cone rubber pile, and its material is polybutadiene rubber or isoprene rubber.

7. The engine mount according to claim 6, characterized in that: The thickness of the rubber body at the bottom of the U-shaped cone of the rubber element is thicker than the thickness of the rubber body at the connection between the rubber element and the side wall of the shell.

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