JPH04122841U - liquid engine mount - Google Patents

Abstract

(57) [Summary] [Purpose] It is possible to obtain an appropriate dynamic spring constant in the medium and high speed engine rotation range, and to prevent sudden changes in the dynamic spring constant when switching from the low speed rotation range to the medium and high speed rotation range. To provide a liquid ring type engine mount. [Configuration] A pressure receiving chamber 9 whose volume increases or decreases depending on the load is defined inside a rubber block 3 connected to the engine, and a balance chamber 13 having a diaphragm 12 inside a mounting bracket 8 connected to the vehicle body frame and a flexible chamber. An intermediate chamber 22 with a membrane 21 is provided. During low-speed rotation, the pressure-receiving chamber 9 is directly connected to the equilibrium chamber 13 via a short communication path formed by an idle orifice 14 by the switching valve 16, and during medium-high speed rotation, the pressure-receiving chamber 9 is connected directly to the equilibrium chamber 13 through a long communication path formed by an idle orifice 14 and a shake orifice 15. It communicates with the equilibrium chamber 13 and the intermediate chamber 22 via. Further, when the switching valve 16 is switched, the pressure receiving chamber 9 communicates with the intermediate chamber 22 via the idle orifice 14.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention is applicable to, for example, an engine for vibration-proofing support of an automobile engine to a vehicle body frame. Regarding gin mounts, it is defined inside an elastic material and its volume changes depending on the load. The pressure receiving chamber is connected to the pressure receiving chamber through a first communicating path having a short length or a second communicating path having a long length. an equilibrium chamber communicating with the chamber; an incompressible fluid sealed inside the pressure receiving chamber and the equilibrium chamber; The two chambers are made to communicate with each other through the first communication passage when the engine speed is low, and the engine speed is low. and a switching valve that communicates with each other through the second communication passage when the engine rotation speed is high. This article relates to liquid-sealed engine mounts.

0002

[Conventional technology]

Such a liquid seal type engine mount is described, for example, in Japanese Patent Application Laid-open No. 113833/1983. It is more well known.

0003 This engine mount is suitable for when the engine rotates at low speeds such as when idling. The pressure receiving chamber and the equilibrium chamber are communicated through a first communication path through which fluid can easily pass, and the dynamic valve By lowering the vibration constant, transmission of low-frequency vibrations to the vehicle body is prevented. Also When the engine mass and mount spring system resonate, such as when the engine shakes, or when starting or accelerating suddenly. When the engine torque suddenly changes due to time, the fluid is received through the second communication passage which is difficult to pass through. The pressure chamber and equilibrium chamber are communicated, and the dynamic spring constant is increased to prevent engine vibration. ing.

0004

[Problem that the idea aims to solve]

By the way, in the middle and high speed range of the engine, the first communication passage connects the pressure receiving chamber and the equilibrium chamber. If the connection is made, the dynamic spring constant will increase rapidly, so in this case, the It is necessary to communicate the pressure receiving chamber and the equilibrium chamber. However, the conventional liquid ring type engine mentioned above The gin mount does not operate even if the second communication passage is used in the engine's medium and high speed range. It is difficult to reduce the spring constant sufficiently, and the movement occurs when switching the communication path. Since the spring constant rapidly increases, there is a problem in that a sufficient vibration damping effect cannot be obtained.

[0005] This invention was made in view of the above-mentioned circumstances, and it It is possible to obtain an appropriate dynamic spring constant by using It is an object of the present invention to provide a liquid-sealed engine mount that can prevent a sudden increase in constant.

[0006]

[Means to solve the problem]

In order to achieve the above object, the present invention provides an elastic material that is defined inside the elastic material and that is A pressure receiving chamber whose volume changes and a first communication passage with a short length or a second communication passage with a long length. an equilibrium chamber that communicates with the pressure receiving chamber through the compressible fluid, and the two chambers are connected to each other through the first communication passage when the engine speed is low. and communicate with each other via the second communication path when the engine speed is high. In a liquid ring type engine mount equipped with a switching valve, at least a portion is made of a flexible membrane. A more defined intermediate chamber with variable volume is provided, and the pressure receiving chamber and the equilibrium chamber are connected via a second communication passage. When the switching valve is switched to a position where they communicate with each other, the switching valve It is characterized in that the interchamber is configured to communicate with the equilibrium chamber.

[0007]

【Example】

Embodiments of the present invention will be described below based on the drawings.

[0008] 1 to 7 show one embodiment of the present invention, and FIG. 1 shows the liquid-sealed engine mount. 2 is a sectional view taken along line 2-2 in FIG. 1, FIG. 3 is a sectional view taken along line 3-3 in FIG. FIG. 4 is an explanatory diagram of the action corresponding to FIG. 1, FIG. 5 is a sectional view taken along the line 5-5 in FIG. 4, and FIG. A block diagram showing the control system, and Figure 7 is a graph showing the relationship between input frequency and dynamic spring constant. be.

As shown in FIGS. 1 and 2, this engine mount M includes a circular mounting plate 1, and the upper part of a mounting bolt 2 passing vertically through the center of the mounting plate 1 is connected to an engine (not shown). be done. A rubber block 3 is vulcanized and bonded to the lower surface of the mounting plate 1 and the lower outer periphery of the mounting bolt 2. An annular casing 4 is vulcanized and bonded to the outer periphery of the rubber block 3, and at the lower end of the casing 4, the outer peripheries of the superimposed upper partition plate 5 and lower partition plate 6, and a valve housing 7 made of synthetic resin or aluminum are attached. The flange portion 7 ₁ formed on the upper portion of the valve housing 7 and the flange portion 8 ₁ formed on the upper portion of the annular mounting bracket 8 covering the outer periphery of the valve housing 7 are vertically pressed and fixed by caulking. The mounting bracket 8 is coupled to a vehicle body frame (not shown) through a flange portion ₈₂ formed at its lower portion.

0010 A recess is formed on the lower surface of the rubber block 3, and a recess is formed between the recess and the upper partition plate 5. A pressure receiving chamber 9 is defined. The volume of the pressure receiving chamber 9 is determined by the rubber between the mounting plate 1 and the casing 4. Excessive deformation of the rubber block 3 caused by the deformation of the block 3 due to the load. is regulated by the lower surface of the mounting plate 1 coming into contact with the upper surface of the rubber block 3.

[0011] The outer circumference of the rubber diaphragm 12 is vulcanized and adhered to the inner surface of the mounting bracket 8. An equilibrium chamber 13 is defined between the diaphragm 12 and the lower surface of the valve housing 7. It will be done. The pressure receiving chamber 9 and the equilibrium chamber 13 are provided with orifices 14, 15 and a switching valve, which will be described later. 16, and an incompressible fluid such as oil is sealed inside them. entered. Therefore, the volume of the pressure receiving chamber 9 increases or decreases due to the deformation of the rubber block 3. The volume of the equilibrium chamber 13 communicating with this pressure receiving chamber 9 is such that the diaphragm 12 is vertically It increases or decreases by deforming.

0012 Next, referring also to FIG. 3, the pressure receiving chamber 9 and the equilibrium chamber 13 are made to communicate with each other. Structure of idle orifice 14, shake orifice 15, and switching valve 16 Explain.

The idle orifice 14 is formed inside the valve housing 7, and its starting end communicates with the pressure receiving chamber 9 through openings 5 ₁ and 6 ₁ formed in the upper partition plate 5 and the lower partition plate 6. The idle orifice 14 includes a first passage 14 1 extending from the openings 5 ₁ , 6 ₁ along the lower surface of the lower partition plate 6 in a circumferential direction counterclockwise over approximately 120 degrees, and the end of the first passage _{14 1 is} It is connected to a third passage 14 ₃ via a second passage 14 ₂ extending downward. The third passage 14 ₃ extends clockwise through 90° along the lower side of the second passage 14 ₂ , and its end is connected to a fourth passage 14 ₄ that extends radially inward and communicates with the switching valve 16 .

[0014] Further, the shake orifice 15 is the fourth passage 14 of the idle orifice 14. _Four A first passage 15 branching radially outward from the middle of₁And this first passage 15₁of a second passageway 15 extending upwardly from the distal end;₂And this second passage 15₂from the end to the bottom A third section extending approximately 180° counterclockwise on the circumference along the lower surface of the partition plate 6 aisle 15₃and a fourth passage 15 extending downward at its end._Foursaid equilibrium via It communicates with room 13.

A switching valve 16 is provided at the end of the fourth passage 14 ₄ of the idle orifice 14 . The switching valve 16 includes a pair of guide portions 16 ₁ and 16 ₂ with a circular cross section that are rotatably supported by the valve housing 7, and a valve portion 16 ₃ formed by cutting out between the guide portions 16 ₁ and 16 ₂ . , a shaft portion ₁₆₄ extending axially from one guide portion ₁₆₂ to the outside of the mounting bracket 8, and a stopper portion having a non-circular cross section with a portion of the shaft portion ₁₆₄ protruding outward in the radial direction. Equipped with 16 ₅ . An arm 17 fixed to the tip of the shaft portion ₁₆₄ is connected to an actuator 18, and by driving this actuator 18, the switching valve 16 is moved between the low speed position shown in FIGS. 1 to 3 and the medium and high speed position shown in FIGS. 4 and 5. Rotate between positions. At this time, the position of the switching valve 16 in the low-speed position and the medium-high speed position is controlled by the stopper part ₁₆₅ coming into contact with a stopper member 29 disposed on its outer periphery. Further, an oil seal 19 and a dust seal 20 are attached to the outer periphery of the shaft portion ₁₆₄ of the switching valve 16 to prevent incompressible fluid from leaking from inside the mounting bracket 8 and dust from entering into the mounting bracket 8. Ru.

[0016] The upper part of the switching valve 16 has a circular opening formed in the center of the lower partition plate 6. A flexible membrane 21 made of rubber is stretched to cover it. Lower surface of flexible membrane 21 and valve housing An intermediate chamber 22 is defined between the upper surfaces of the switch valve 7, and this intermediate chamber 22 is connected to the valve of the switching valve 16. Part 16₃It is opened and closed by That is, when the switching valve 16 is in the low speed position shown in FIGS. When the pressure receiving chamber 9 is The intermediate chamber 22 communicates directly with the equilibrium chamber 13 via the switching valve 16 located at the valve section 16. ₃ is occluded by On the other hand, when the switching valve 16 is in the medium and high speed position in FIGS. 4 and 5, The valve part 16 of the switching valve 16₃Due to the direct connection between the idle orifice 14 and the equilibrium chamber 13 communication is cut off, and the pressure receiving chamber 9 is connected to the idle orifice 14 as a second communication path. The equilibrium chamber 13 is connected to the equilibrium chamber 13 through both of the quake orifices 15, and the equilibrium chamber 13 is further connected to a valve. Part 16₃It communicates with the intermediate chamber 22 opened by. Also, the switching valve 16 is switched from the low speed position. Since the intermediate chamber 22 is opened at the same time as the rotation starts toward the medium-high speed position, the During switching, the intermediate chamber 22 communicates with the pressure receiving chamber 9 via the idle orifice 14. .

[0017] As shown in FIG. 6, a control unit that controls the engine mount M A power supply 24, a rotation speed sensor 25, and a solenoid valve 26 are connected to 23. , the solenoid valve is activated in accordance with the change in engine speed detected by the rotation speed sensor 25. The opening and closing of the valve 26 is controlled. The solenoid valve 26 is connected to the pressure of the atmosphere 27 and the engine. The negative pressure of the intake manifold 28 is selectively transmitted to the actuator 18. , the switching valve 16 of the engine mount M is opened and closed.

[0018] Next, the operation of the embodiment of the present invention having the above-mentioned configuration will be explained with respect to the input frequency on the horizontal axis. This will be explained with reference to the graph of FIG. 7 in which the vertical axis is the constant.

[0019] Low engine speed range such as idling (input frequency 20 to 45 Hertz) In (3), the switching valve 16 is in the low speed position shown in FIGS. 1 to 3, and the pressure receiving chamber 9 is in the first communication path. The intermediate chamber 22 communicates directly with the equilibrium chamber 13 through the idle orifice 14 as is closed by the switching valve 16. At this time, the end of the idle orifice 14 is It also communicates with the equilibrium chamber 13 through the shake orifice 15, but as mentioned above, The end of the idle orifice 14 directly communicates with the equilibrium chamber 13 via the switching valve 16. Therefore, the shake orifice 15 does not substantially function.

[0020] In the low-speed rotation range mentioned above, the pressure generated in the pressure receiving chamber 9 due to the deformation of the rubber block 3 Due to the fluctuation, the fluid in the idle orifice 14 resonates as a liquid column, and the rubber block 3 The dynamic spring constant can be lowered further than the main component of the spring. As a result, fig. 7, the dynamic spring constant in the input frequency range of 20 to 45 Hz is shown by the dashed line. The number is kept low, effectively blocking vibration transmission from the engine to the vehicle body.

[0021] However, as described above, the idle orifice 14 causes the pressure receiving chamber 9 and the equilibrium chamber to 13 is in communication, the input frequency increases during acceleration, that is, in the medium speed rotation range. There is an inconvenience that the dynamic spring constant increases rapidly as the load increases. For this, type When the frequency reaches approximately 45 Hz, the switching valve 16 is turned off from the low speed position shown in Figures 1 to 3. 3 and 4 when the input frequency reaches approximately 65 Hz. Complete the changeover to the medium-high speed position. During that time, when the switching valve 16 starts rotating, At the same time, since the end of the idle orifice 14 communicates with the intermediate chamber 22, the pressure receiving chamber 9 Pressure fluctuations are absorbed by elastic deformation of the flexible membrane 21 in the intermediate chamber 22. This results in In the input frequency range of 45 to 65 Hz, the dynamic spring constant is the value shown by the dashed line. It becomes possible to significantly reduce the value from the value shown by the broken line.

[0022] When the input frequency reaches a high speed range exceeding approximately 65 Hz, the switching valve 16 is switched off. After the replacement is completed, the pressure receiving chamber 9 and the equilibrium chamber 13 are connected in series as a second communication path. The idle orifice 14 and the shake orifice 15 communicate with each other. The equilibrium chamber 13 also communicates with an open intermediate chamber 22. In this case shake orifice 15 is suffocated by high-frequency vibrations and the flow resistance becomes large. If there is no communication between the intermediate chamber 22 and the equilibrium chamber 13, as shown by the two-dot chain line in FIG. It becomes difficult to sufficiently reduce the dynamic spring constant in the high speed rotation range. but However, in the present invention, the intermediate chamber 22 and the equilibrium chamber 13 communicate with each other. Since the fluid pressure is absorbed by the deformation of the flexible membrane 21 of 22, the actual dynamic spring constant is The value decreases from the value shown by the two-dot chain line to the value shown by the solid line, and its characteristics are improved.

[0023] Although the embodiments of the present invention have been described in detail above, the present invention is limited to the above embodiments. However, various inventions may be made without departing from the present invention as stated in the claims for utility model registration. It is possible to make small design changes.

[0024] For example, in the embodiment, the idle orifice 14 constituting the first communication path is connected to the second communication path. However, it is not possible to provide the first communication path and the second communication path completely separately. Both are possible.

[0025]

[Effect of the idea]

As described above, according to the features of the present invention, when the engine speed is high, the pressure receiving chamber At the same time, the equilibrium chamber is communicated with the equilibrium chamber via a second communication path having a long length. Since it communicates with the intermediate chamber having a flexible membrane, the second communication passage is Even if the fluid suffocates and the fluid pressure increases, the fluid pressure is absorbed by the deformation of the flexible membrane and the dynamic spring It is possible to suppress the increase in the net constant. In addition, the first communication passage and the second communication passage are connected by a switching valve. Since the intermediate chamber communicates with the pressure receiving chamber during road switching, the engine speed is low. This prevents sudden changes in the dynamic spring constant during the transition from high speed to high speed, resulting in a wide rotation speed range. The dynamic spring constant can be maintained at an appropriate value.

[Brief explanation of drawings]

[Figure 1] Longitudinal cross-sectional view of liquid ring type engine mount

[Figure 2] Cross-sectional view taken along line 2-2 in Figure 1

[Figure 3] Cross-sectional view taken along line 3-3 in Figure 1

[Fig. 4] Explanatory diagram of the action corresponding to Fig. 1

[Figure 5] Cross-sectional view taken along line 5-5 in Figure 4

[Figure 6] Block diagram showing the control system

[Figure 7] Graph showing the relationship between input frequency and dynamic spring constant

[Explanation of symbols]

3... Rubber block (elastic material) 9... Pressure receiving chamber 13... Equilibrium chamber 14... Idle orifice (first communication path, second communication path) 15... Shake orifice (second communication path) 16.・Switching valve 21・・Flexible membrane 22・・Intermediate chamber

Claims (1)

[Scope of utility model registration request] Claim 1: A pressure receiving chamber (9) defined inside the elastic material (3) whose volume changes depending on the load, and a first communication passage (14) having a short length or a second communication passage having a long length. (14,1
an equilibrium chamber (1) communicating with the pressure receiving chamber (9) via a
3), an incompressible fluid sealed inside the pressure receiving chamber (9) and the equilibrium chamber (13), and a first communication passage (14) connecting both the chambers (9, 13) when the engine speed is low. The switching valves (14, 15) communicate with each other through the second communication passages (14, 15) when the engine speed is high.
A liquid-sealed engine mount comprising: a variable volume intermediate chamber (22) at least partially defined by a flexible membrane (21);
When the switching valve (16) is switched to a position where the two chambers (3) communicate with each other via the second communication passage (14, 15), the switching valve (16) switches the intermediate chamber (22) into an equilibrium chamber ( 1
3) A liquid-sealed engine mount characterized by being configured to communicate with the engine mount.