JP3989475B2 - Support device for internal combustion engine - Google Patents

Description

  The present invention relates to a support device for an internal combustion engine using a negative pressure switching engine mount that can change damping characteristics by switching to negative pressure or atmospheric pressure.

As a support device for an internal combustion engine, a device using a negative pressure switching type engine mount has been put to practical use.
A practical internal combustion engine support device was practically sufficient if the negative pressure switching engine mount was switched to negative pressure or atmospheric pressure to change the damping characteristics.

As such a support device for an internal combustion engine, a device in which the damping characteristic of a negative pressure switching engine mount is changed in an idle rotation range and a high-speed rotation range of the engine is known (for example, see Patent Document 1). .
JP 2003-49892 A (page 7, FIG. 1)

  FIG. 7 is a diagram for explaining a conventional basic configuration. An internal combustion engine support device 300 suspends (mounts) an engine (internal combustion engine) 301 on a vehicle body 303 via a negative pressure switching engine mount 302 and applies negative pressure. A solenoid valve (electromagnetic switching valve) 304 is connected to the pressure introduction pipe of the switching engine mount 302, and this solenoid valve 304 is exposed to atmospheric pressure and negative pressure from the intake manifold 305 of the engine 301. By switching the pressure guided to the switchable engine mount 302 with the solenoid valve 304, the degree of hardness for supporting the engine 301 with the negative pressure switchable engine mount 302 (hereinafter abbreviated as “mount characteristic”), that is, the damping characteristic is adjusted. It is intended to change. For example, when the engine 301 is in the idling rotation range, the negative pressure is guided to the negative pressure switching engine mount 302 to soften the mount characteristics, and when the engine 301 is in the high rotation range, the negative pressure switching engine mount 302 is set. The mount characteristics are set hard by introducing atmospheric pressure.

In general, when an engine is supported on a subframe (not shown) or the like via a negative pressure switching engine mount, a plurality of (for example, four) engine mounts are used.
Since the conventional internal combustion engine support device 300 is a system that simultaneously switches the mounting characteristics (damping characteristics) of the plurality of negative pressure switching engine mounts 302, the mounting characteristics (damping characteristics) change rapidly due to this switching. May end up.

  The present invention provides a support device for an internal combustion engine that suppresses a large change in mount characteristics (attenuation characteristics) when switching a negative pressure switching type engine mount and can improve an engine (internal combustion engine) vibration suppression effect. The task is to do.

Invention, the negative pressure change-interchangeable mounting of the two systems capable of changing the damping characteristics by switching the negative pressure or the atmospheric pressure is provided in body the internal combustion engine through these negative pressure changeover interchangeable mount according to claim 1 In a supporting device for an internal combustion engine that is supported on the side, first and second pipes for introducing negative pressure or atmospheric pressure are provided in two negative pressure switching mounts, respectively, and these first and second pipes are provided. A one-way valve and an orifice that regulates the flow rate are provided in parallel on one of the paths, and the negative pressure or the atmospheric pressure introduction side from the junction of the first and second pipes is set to a negative pressure or a pressure according to the traveling state of the vehicle. A switching valve for switching to atmospheric pressure is provided .

  Therefore, a one-way valve and an orifice for regulating the flow rate are provided in parallel on one of the first and second pipes to control the flow of air flowing through the two systems of negative pressure switching mounts.

  That is, first and second pipes for introducing negative pressure or atmospheric pressure are provided in two systems of negative pressure switching type mounts, respectively, and a one-way valve and one of these first and second pipes are provided. By providing an orifice to regulate the flow rate in parallel, the timing when switching to negative pressure or atmospheric pressure is shifted. As a result, the third mode can be set in the negative pressure switching type engine mount in addition to the mode obtained at the negative pressure and the mode obtained at the atmospheric pressure in the mount characteristics (attenuation characteristics).

Two negative pressure switching mounts by providing a switching valve that switches to negative pressure or atmospheric pressure according to the running state of the vehicle on the negative pressure or atmospheric pressure introduction side from the confluence of the first and second pipes Can be switched by one switching valve.

  In the invention according to claim 1, first and second pipes for introducing negative pressure or atmospheric pressure are provided in the two systems of negative pressure switching mounts, respectively, and of these first and second pipes Since the one-way valve and the orifice for regulating the flow rate are provided in parallel on one of them, the timing when switching to negative pressure or atmospheric pressure can be shifted. As a result, the third mode can be set in the negative pressure switching type engine mount in addition to the mode obtained at negative pressure and the mode obtained at atmospheric pressure in the mount characteristics (damping characteristics), which contributes to the reduction of vibration. There is an advantage that the quietness of the vehicle can be improved.

In addition , a switching valve that switches to negative pressure or atmospheric pressure according to the running state of the vehicle is provided on the negative pressure or atmospheric pressure introduction side from the junction of the first and second pipelines, thereby switching the negative pressure of the two systems. Switching of the type mount can be performed with a single switching valve. As a result, there is an advantage that the cost of the support device for the internal combustion engine can be reduced .

The best mode for carrying out the present invention will be described below with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals.
FIG. 1 is a system configuration diagram of a vehicle employing an internal combustion engine support device according to the present invention, in which 10 is a vehicle, 11 is a body frame as a vehicle body, 12 is an engine as an internal combustion engine, and 13 is a front sub. A frame, 14 is a front bumper, 15 is a bonnet, 16 is a front fender, 17 is a front window, 18 is a front door, and 19 is a front wheel.

  The internal combustion engine support device 30 is provided with two systems of negative pressure switchable mounts 31 and 32 that can change the damping characteristics by switching to negative pressure or atmospheric pressure, and through these negative pressure switchable mounts 31 and 32. In the internal combustion engine support device for supporting the engine (internal combustion engine) 12 on the vehicle body frame (vehicle body) 11 side, first and second pressure guides 31 and 32 for introducing negative pressure or atmospheric pressure to the negative pressure switching mounts 31 and 32, respectively. The second pipes 33 and 34 are provided, and one of these first and second pipes 33 and 34 is provided with a one-way valve 35 and an orifice 36 for regulating the flow rate of air in parallel. The details will be described below.

  The negative pressure switching mount 31 is referred to as a first-system liquid-filled engine mount 31 (hereinafter abbreviated as “first engine mount”), and the negative pressure switching mount 32 is referred to as a second system. The liquid-enclosed engine mount (hereinafter abbreviated as “second-system engine mount”).

  Further, the degree of hardness that supports the engine (internal combustion engine) 12 by the engine mounts 31 and 32 of the first system and the second system is defined as “mount characteristic (or damping characteristic)”), and the engine 12 is It is described that the mount characteristic (or attenuation characteristic) is hard when firmly supported, and the mount characteristic (or attenuation characteristic) is soft when the engine 12 is supported softly.

  FIG. 2 is a perspective view showing an example of a front structure of a vehicle body frame on which a support device for an internal combustion engine according to the present invention is mounted. The front structure of the vehicle body frame 11 includes left and right front side frames 61 extending in the longitudinal direction of the vehicle body. 61, left and right upper frames 62, 62 extending forward and backward of the vehicle body on the outer side in the vehicle width direction of the front side frames 61, 61, and the front side frames 61, 61 and the upper frames 62, 62. The left and right front damper housings 63, 63 spanned between and the front bulkhead 64 coupled to the front portions of the left and right front side frames 61, 61 and the front portions of the left and right upper frames 62, 62 are as main components. A monocoque body.

The front bulkhead 64 includes a lower cross member 65 that extends in the vehicle width direction below the front portions of the left and right front side frames 61, 61, and left and right side stays 66 that extend upward from both ends of the lower cross member 65. 66 and an upper cross member 67 that extends in the vehicle width direction so as to be coupled to the upper ends of the side stays 66 and 66 are main components.
The upper cross member 67 is formed by extending left and right extension portions 68 and 68 obliquely rearward from both left and right ends, and is coupled to the left and right upper frames 62 and 62 in the middle of the length via the extension portions 68 and 68.

  That is, the vehicle body frame 11 includes front and rear left and right 4 front and rear left and right front frames 61 and 61 and front left and right floor frames 69 and 69 extending rearward from the rear ends of the front side frames 61 and 61. The front sub-frame 13 is suspended through a single elastic bushing for vibration isolation 70 (... indicates a plurality, the same applies hereinafter).

  The front sub-frame 13 is a frame having a substantially cross-beam shape or a substantially rectangular shape, and includes a front horizontal member 72, a left vertical member 71 extending rearward from the left and right ends of the front horizontal member 72, and a right front It consists of a right vertical member 71 extending rearward from the joint 74 and a rear horizontal member 73 connected to the tips of these left and right vertical members 71, 71.

  FIG. 3 is a perspective view showing a state in which the internal combustion engine (engine) is mounted on the front subframe employed in the support device for the internal combustion engine according to the present invention. The front subframe 13 has a horizontal engine (internal combustion engine) in the right half. Engine) 12 is mounted, and transmission 22 is mounted on the left half. The transmission 22 transmits power by extending the propeller shaft 23 rearward from the output side.

  FIG. 4 is a system diagram of the internal combustion engine support device according to the present invention. The internal combustion engine support device 30 supports a first system engine mount 31 that supports the front portion of the engine 12 and the rear portion of the engine 12. A second system engine mount 32, a first pipe line 33 extending from the first system engine mount 31, a one-way valve (one-way valve) 35 and an orifice 36 provided halfway along the first pipe line 33. A second pipe 34 extending from the engine mount 32 of the second system, a junction pipe 38 connected to a junction 37 of the first and second pipes 33 and 34, and the junction pipe 38 A switching valve (solenoid valve (electromagnetic switching valve)) 39 provided at the tip, a negative pressure introduction pipe 41 extending from one of the switching valves 39, and an air opening duct extending from the other of the switching valves 39 2, a control unit (ECU) 43 that controls the switching valve 39 consists.

  The ECU 43 is an abbreviation for an electric control unit. The ECU 43 controls the engine 12 and reads vehicle information 44 such as an engine speed, an accelerator opening, a brake signal, or an engine start detection, thereby switching the valve. (Solenoid valve) 39 is turned ON / OFF, switched to negative pressure / atmospheric pressure, and controls the engine mounts 31 and 32 of the first and second systems.

  The negative pressure introduction pipe 41 is a passage for introducing a negative pressure to the first system engine mount 31 and the second system engine mount 32 by connecting the tip to the intake manifold 21 of the engine 12.

  The one-way valve (one-way valve) 35 and the orifice 36 are members arranged in parallel in the middle of the first pipe line 33, and the one-way valve 35 is directed from the engine mount 31 of the first system toward the junction 37. It is a valve arranged to flow fluid (air) in one direction.

  That is, first and second pipe lines 33 and 34 for introducing negative pressure or atmospheric pressure to first and second system engine mounts (two negative pressure switching mounts) 31 and 32, respectively, One of these first and second pipes 33 and 34 is provided with a one-way valve 35 and an orifice 36 for regulating the flow rate in parallel, thereby shifting the timing when switching to negative pressure or atmospheric pressure. . As a result, the third mode can be set for the engine mounts 31 and 32 of the first system and the second system in addition to the mode obtained at negative pressure and the mode obtained at atmospheric pressure for the mount characteristics (attenuation characteristics). . Thereby, it can contribute to reduction of vibration and can aim at improvement in silence of vehicle 10 (refer to Drawing 1).

  The internal combustion engine support device 30 is switched from the junction 37 of the first and second pipes 33 and 34 to the negative pressure or atmospheric pressure introduction side to switch to the negative pressure or the atmospheric pressure according to the traveling state of the vehicle. It can be said that it is provided.

  By providing a switching valve 39 for switching to the negative pressure or the atmospheric pressure in accordance with the traveling state of the vehicle on the negative pressure or atmospheric pressure introduction side from the junction 37 of the first and second pipelines 33 and 34, the first system The second engine mount (two negative pressure switching mounts) 31 and 32 can be switched with one switching valve. As a result, the cost of the internal combustion engine support device 30 can be reduced.

  It can be said that the internal combustion engine support device 30 has the one-way valve 35 oriented from the first system engine mount (negative pressure switching mount) 31 toward the switching valve 39.

  When switching from atmospheric pressure to negative pressure by directing the direction of the one-way valve 35 from the first engine mount (negative pressure switching mount) 31 to the switching valve 39, two negative pressure switching mounts When switching from negative pressure to atmospheric pressure, the switching timing of one of the two systems of negative pressure switching mounts can be shifted (delayed) compared to the other.

  As a result, for example, when the first and second engine mounts (two negative pressure switching mounts) 31 and 32 are switched from negative pressure to atmospheric pressure, the internal combustion engine (engine) 12 speed is idle. By setting the rotational range to the high-speed rotational range, it is possible to smoothly suppress an increase in vibration of the internal combustion engine (engine) 12 at the time of start. As a result, it is possible to improve the quietness when starting.

The operation of the internal combustion engine support device 30 described above will be described.
5 (a) and 5 (b) are operation explanatory views showing a state during idling of the support device for the internal combustion engine according to the present invention, and (a) shows the support device 230 for the internal combustion engine of the comparative example. b) shows the internal combustion engine support device 30 of the embodiment.

  In (a), the internal combustion engine support device 230 includes a first system engine mount 231 and a second system engine mount 232 that support the engine 212, and a first pipeline extending from the first system engine mount 231. 233, a second pipe 234 extending from the engine mount 232 of the second system, a junction pipe 238 connected to a junction 237 of the first and second pipes 233 and 234, and the junction pipe 238 A switching valve (solenoid valve) 239 provided at the tip of the switch, a negative pressure introduction pipe 241 extending from one of the switching valves 239, an air opening duct 242 extending from the other of the switching valves 239, and a control for controlling the switching valve 239 (ECU) 243, and the ECU 243 includes the engine speed, the accelerator opening, the brake signal, or the engine By reading vehicle information 244 such as gin start detection, the switching valve (solenoid valve) 239 is turned on / off, switched to negative pressure / atmospheric pressure, and the first and second system engine mounts 231 and 232 are controlled. To do.

  That is, the internal combustion engine support device 230 switches the switching valve 239 from OFF to ON, switches the engine mounts 231 and 232 of the first system / second system from atmospheric pressure to negative pressure, and controls the first system / second system. The mount characteristics (attenuation characteristics) of the engine mounts 231 and 232 are simultaneously switched. Note that (a) indicates that the mount characteristic (attenuation characteristic) is set to a soft state.

  In (b), the internal combustion engine support device 30 directs the switching valve 39 by directing the direction of the one-way valve 35 from the first system engine mount (negative pressure switching mount) 31 to the switching valve 39. When switching from OFF to ON and switching from atmospheric pressure to negative pressure, the mount characteristics (damping characteristics) of the first and second engine mounts (two negative pressure switching mounts) 31, 32 can be switched simultaneously. it can. Incidentally, (b) shows that the mount characteristic (attenuation characteristic) is set in a soft state.

  6 (a) and 6 (b) are operation explanatory views showing the state of the internal combustion engine support device according to the present invention during the engine running rotation, and FIG. 6 (a) shows the internal combustion engine support device 230 of the comparative example, (B) shows the internal combustion engine support device 30 of the embodiment.

  In (a), the mount characteristic (damping characteristic) is set to a hard state. In the internal combustion engine support device 230, the switching valve 239 is switched from ON to OFF, and the first and second engine mounts 231 are set. , 232 is changed from the negative pressure to the atmospheric pressure, the large mount characteristics (attenuation characteristics) of the first and second engine mounts 231 and 232 are affected. The mount characteristics of the first and second engine mounts 231 and 232 may change before the change.

  In (b), the mount characteristic (damping characteristic) is set to a hard state. In the internal combustion engine support device 30, the first system and second system engine mounts (two systems of negative pressure switching mounts) 31 are used. , 32 are provided with first and second pipes 33, 34 for introducing negative pressure or atmospheric pressure, respectively, and one-way valve 35 and flow rate are provided in one of these first and second pipes 33, 34. By providing the orifices 36 for regulating the pressure in parallel, the timing for switching to the negative pressure or the atmospheric pressure is shifted. As a result, the third mode can be set for the engine mounts 31 and 32 of the first system and the second system in addition to the mode obtained at negative pressure and the mode obtained at atmospheric pressure for the mount characteristics (attenuation characteristics). .

  That is, since the support device 30 for the internal combustion engine directs the direction of the one-way valve 35 from the first system engine mount (negative pressure switching mount) 31 to the switching valve 39, the switching valve 39 is switched from ON to OFF. When the engine mounts 31 and 32 of the first system / second system are switched from negative pressure to atmospheric pressure, a sudden change in the mount characteristics (attenuation characteristics) of the engine mount 31 of the first system is prevented. For example, it is possible to adapt to the mount characteristic (attenuation characteristic) corresponding to the engine speed during the engine rotation changing from the idle state to the running state. Thereby, it can contribute to reduction of vibration and can aim at improvement in silence of vehicle 10 (refer to Drawing 1).

  In the internal combustion engine support device according to the present invention, as shown in FIG. 4, the first engine mount 31 and the second engine mount 32 are one engine mount, but the present invention is not limited thereto. Instead, it may be a combination of a plurality of engine mounts.

  In the internal combustion engine support device according to the present invention, as shown in FIG. 4, the direction of the one-way valve 35 is directed from the first system engine mount 31 toward the switching valve 39, but is not limited thereto. The one-way valve may be directed from the switching valve 39 toward the first system engine mount 31.

  As shown in FIGS. 5 and 6, the internal combustion engine support device according to the present invention switches from atmospheric pressure to negative pressure and switches the switching valve 39 from ON when the switching valve 39 is switched from OFF to ON. When switched to OFF, the pressure is switched from negative pressure to atmospheric pressure. However, the present invention is not limited to this, and the switching valve may be set to the reverse mode.

  The internal combustion engine support device according to the present invention is suitable for use in a vehicle such as a passenger car or a wagon equipped with an engine (internal combustion engine) having a large displacement.

1 is a system configuration diagram of a vehicle employing a support device for an internal combustion engine according to the present invention. It is a perspective view which shows an example of the front part structure of the vehicle body frame which mounts the support apparatus of the internal combustion engine which concerns on this invention. 1 is a perspective view showing a state in which an internal combustion engine (engine) is mounted on a front subframe employed in a support device for an internal combustion engine according to the present invention. 1 is a system diagram of a support device for an internal combustion engine according to the present invention. It is action explanatory drawing which shows the state at the time of idle rotation of the support apparatus of the internal combustion engine which concerns on this invention. It is action explanatory drawing which shows the state at the time of engine running rotation of the support apparatus of the internal combustion engine which concerns on this invention. It is a figure explaining the conventional basic composition.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Vehicle, 11 ... Car body (body frame), 12 ... Internal combustion engine (engine), 30 ... Support apparatus of internal combustion engine, 31, 32 ... Two systems of negative pressure switching mounts (first system / second system engine) Mount), 33, 34 ... first and second pipes, 35 ... one-way valve, 36 ... orifice, 37 ... confluence, 39 ... switching valve.

Claims (1)

A negative pressure change-interchangeable mounting of the two systems capable of changing the damping characteristics by switching the negative pressure or the atmospheric pressure is provided, the support of an internal combustion engine for supporting the internal combustion engine to the vehicle body via these negative pressure changeover interchangeable mount In the device
The two systems of negative pressure switching mounts are respectively provided with first and second pipes for introducing negative pressure or atmospheric pressure, and one-way valve and flow rate are provided in one of the first and second pipes. an orifice for restricting the provided in parallel,
A support for an internal combustion engine, characterized in that a switching valve for switching to a negative pressure or an atmospheric pressure is provided on the negative pressure or atmospheric pressure introduction side from the confluence of the first and second pipes according to the running state of the vehicle. apparatus.

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