JP5949350B2 - Internal combustion engine - Google Patents

Description

  The present invention relates to the structure of an internal combustion engine.

  A conventional internal combustion engine (hereinafter referred to as an engine) such as an automobile has a damping oil pan in order to suppress noise generated from an oil pan that accumulates engine oil (hereinafter referred to as oil). For example, a damping oil pan is disclosed in which a synthetic resin having flexibility and self-adhesiveness is attached to the inner bottom surface of the oil pan (see, for example, Patent Document 1). With this configuration, vibration of the oil pan can be suppressed.

  Further, a damping oil pan is disclosed in which an inner pan is disposed inside the oil pan, the oil between the oil pan and the inner pan is pressurized, and the vibration of the oil pan is attenuated by this oil (for example, Patent Document 2). reference). With this configuration, when the engine is operated and the oil is at a high temperature, the vibration of the oil pan can be attenuated. Further, the vibration-damping oil pan has a configuration in which the inner pan is fixed to the oil pan by a temperature-sensitive stopper when the oil is at a low temperature before the engine is started. With this configuration, it is possible to suppress the interference sound generated by the contact between the oil pan and the inner pan when the oil is at a low temperature.

  As described above, the above-described vibration-damping oil pan can suppress noise generated from the oil pan during engine operation.

  However, the above-described vibration-damping oil pan has a problem in that it cannot suppress a beat sound generated from the oil pan when the oil is at a low temperature, such as when the engine is started. This beat noise is a noise generated when a pulsation is generated when oil is sucked from the oil pan by the oil strainer, and this pulsation vibrates the oil pan. This oil pulsation occurs when the oil is cold and highly viscous.

  For example, in the case of the vibration-damping oil pan to which the above-described synthetic resin is attached, resonance of the oil pan can be suppressed against continuous vibration with a small amplitude such as an engine. However, vibration with large amplitude such as pulsation cannot be suppressed. Therefore, this vibration-damping oil pan cannot suppress the beat sound generated from the oil pan.

  Further, in the case of the vibration-damping oil pan using the above-described inner pan, similarly to the above, vibration with a large amplitude such as pulsation cannot be suppressed. Further, since the inner pan is fixed to the oil pan at a low temperature when oil pulsation occurs, the vibration-damping oil pan cannot exhibit a function of suppressing the vibration of the oil pan. Therefore, this vibration-damping oil pan cannot suppress the beat sound generated from the oil pan.

JP-A-7-63031 JP 7-293328 A

The present invention has been made in view of the above problems, and its purpose is to suppress unnecessary stress generated in the oil pan and to generate from the oil pan when the engine oil is low temperature and high viscosity. An object of the present invention is to provide an internal combustion engine that can suppress a roaring sound.

  In order to achieve the above object, an internal combustion engine according to the present invention is an internal combustion engine having an oil pan provided with a vibration damping device, wherein the vibration damping device is moved or deformed by a change in temperature, and the operation A damping rubber installed on the member, and when the temperature of the oil in the oil pan falls below a predetermined temperature, the actuating member causes the damping rubber to contact the oil pan. It is comprised by these.

  With this configuration, it is possible to suppress a beat sound generated from the oil pan when the temperature of the oil is low and the viscosity is high.

  In the internal combustion engine described above, at least a part of the operating member is made of bimetal.

  With this configuration, the temperature of the oil when the damping rubber is brought into contact with the oil pan can be accurately determined. Further, the operating member can be configured at a low cost.

  In the internal combustion engine, the operating member has a configuration in which the damping rubber is sandwiched between the two operating members from both sides, and the other end side of the two operating members is fixed directly or indirectly to the oil pan. It is characterized by that.

  With this configuration, it is possible to further suppress the beat sound generated from the oil pan. This is because the force for pressing the damping rubber against the oil pan can be increased.

  In the internal combustion engine, the operating member is configured to separate the damping rubber from the oil pan when the temperature of the oil in the oil pan becomes higher than a predetermined temperature. It is characterized by.

  With this configuration, it is possible to improve the durability of the vibration damping rubber and to suppress unnecessary stress generated in the oil pan. This is because the damping rubber can be pressed against the oil pan only when necessary.

  According to the internal combustion engine of the present invention, it is possible to suppress an unnecessary stress generated in the oil pan, and to suppress a beat sound generated from the oil pan when the engine oil has a low temperature and a high viscosity. Institution can be provided.

1 is a diagram schematically illustrating an internal combustion engine according to an embodiment of the present invention. It is the figure which showed the outline of the oil pan of the internal combustion engine of embodiment which concerns on this invention. It is the figure which showed the outline of the oil pan of the internal combustion engine of embodiment which concerns on this invention. It is the figure which showed the outline of the oil pan of the internal combustion engine of different embodiment which concerns on this invention. It is the figure which showed the outline of the oil pan of the internal combustion engine of different embodiment which concerns on this invention.

Hereinafter, an internal combustion engine according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows an outline of an internal combustion engine (hereinafter referred to as an engine) 1 according to an embodiment of the present invention. The engine 1 has an oil pan 2 provided with a vibration damping device 3. The engine 1 also has an oil strainer 4 that sucks up engine oil EO stored in the oil pan 2.

  FIG. 2 schematically shows an oil pan 2 at a high temperature of the engine 1 according to the embodiment of the present invention. The vibration damping device 3 installed in the oil pan 2 includes an operation member 11 that moves or deforms due to a change in temperature, and a vibration suppression rubber 12 installed on the operation member 11. The actuating member 11 can be made of, for example, a bimetal that is fixed to the side wall of the oil pan 2. This bimetal is a material configured such that two kinds of metals having different expansion coefficients are bonded together and bent with a change in temperature due to the difference in expansion coefficients.

  Next, the operation of the vibration damping device 3 will be described. When the engine 1 is operated and the temperature of the oil EO in the oil pan 2 becomes higher than a predetermined temperature (at a high temperature), the operating member 11 made of bimetal causes the vibration damping rubber 12 to move the damping rubber 12 to the oil pan 2. It curves so that it may separate from. That is, the damping rubber 12 and the oil pan 2 are not in contact with each other. Here, “high temperature” refers to a state in which no roaring sound is generated. For example, the oil EO temperature is 50 ° C. or higher. However, this temperature varies depending on the physical properties of the oil.

  FIG. 3 shows an outline of the oil pan 2 at a low temperature of the engine 1 according to the embodiment of the present invention. When the temperature of the oil EO is equal to or lower than a predetermined temperature (when the temperature is low), for example, before the engine 1 is started, the actuating member 11 bends so that the damping rubber 12 contacts the oil pan 2. At this time, it is desirable that the actuating member 11 is configured to press the damping rubber 12 against the oil pan 2 and maintain a state where a compression force is generated in the damping rubber 12. Here, the low temperature is a state in which a roaring sound can be generated. For example, the temperature of the oil EO is less than 50 ° C. However, this temperature varies depending on the physical properties of the oil.

  With the above configuration, the following operational effects can be obtained. First, when the temperature of the oil EO is low and the viscosity is high (at a low temperature), it is possible to suppress the beat sound generated from the oil pan 2. This is because the vibration damping rubber 12 is pressed against the oil pan by the operation of the operation member 11 and the vibration of the oil pan 2 can be suppressed.

  Secondly, the temperature of the oil EO when the damping rubber 12 is brought into contact with the oil pan 2 can be accurately determined. Moreover, the operation member 11 can be manufactured at low cost. This is because a bimetal is used for the operating member 11.

  Thirdly, the durability of the vibration damping rubber 12 can be improved and unnecessary stress generated in the oil pan 2 can be suppressed. This is because the damping rubber 12 can be pressed against the oil pan 2 only when necessary.

  The present invention is applied to a conventional damping oil pan such as a synthetic resin damping member attached to the inner bottom surface of the oil pan 2 in order to suppress noise generated from the oil pan 2 during engine operation. Can be used in combination. With this configuration, it is possible to suppress both a beating sound generated when the oil EO is at a low temperature and a noise generated by the oil pan 2 resonating with the vibration of the engine 1.

  Moreover, although the manufacturing cost of the engine 1 increases, the operating member 11 can be configured to move the damping rubber 12 by the control of the driving device and the temperature sensor.

FIG. 4 shows an outline of an oil pan 2A at a high temperature of an engine according to another embodiment of the present invention. The oil pan 2A has a vibration damping device 3A. An operation member (bimetal) 11A of the vibration damping device 3A includes a vibration damping rubber 12A sandwiched between two operation members 11A from both sides, and the other end of the two operation members 11A is connected to the oil pan 2A via a support member 13. It has a configuration that is indirectly fixed. Note that the actuating member 11A may be configured to be directly fixed to the oil pan 2A.

  Next, the operation of the vibration damping device 3A will be described. When the temperature of the oil EO becomes higher than a predetermined temperature (at a high temperature), the two actuating members 11A made of bimetal are curved so as to separate the damping rubber 12A from the oil pan 2A. That is, the damping rubber 12A and the oil pan 2A do not contact each other.

  FIG. 5 shows an outline of an oil pan 2 </ b> A at a low temperature of an engine according to another embodiment of the present invention. When the temperature of the oil EO becomes lower than a predetermined temperature (at a low temperature), the two actuating members 11A made of bimetal are bent so as to bring the damping rubber 12A into contact with the oil pan 2A.

  With this configuration, it is possible to further suppress the beat sound generated from the oil pan 2A. This is because the force pressing the damping rubber 12A against the oil pan 2A is increased by the bimetal disposed on both sides of the damping rubber 12A.

  In addition, although the example which installed the damping device 3 and 3A in the oil pan 2 and 2A of the engine 1 was demonstrated, this damping device can be applied also to the oil pan which accumulates other oils, such as mission oil. . Here, when the physical properties of the oil EO are different, it is desirable to change the material of the bimetal employed for the actuating members 11 and 11A.

1 Internal combustion engine
2, 2A Oil pan 3, 3A Damping device 11, 11A Actuating member 12, 12A Damping rubber EO Oil (engine oil)

Claims (4)

In an internal combustion engine having an oil pan with a damping device,
The vibration damping device has an operation member that moves or deforms due to a change in temperature, and a vibration control rubber installed on the operation member,
The internal combustion engine, wherein the operating member is configured to bring the damping rubber into contact with the oil pan when the temperature of the oil in the oil pan becomes equal to or lower than a predetermined temperature.   The internal combustion engine according to claim 1, wherein at least a part of the operating member is made of bimetal.   The operation member has a configuration in which the damping rubber is sandwiched between two operation members from both sides, and the other end side of the two operation members is directly or indirectly fixed to the oil pan. Item 3. The internal combustion engine according to Item 2.   The operation member is configured to separate the damping rubber from the oil pan when the temperature of the oil in the oil pan becomes higher than a predetermined temperature. The internal combustion engine according to any one of 1 to 3.

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