WO2019103096A1

WO2019103096A1 - Liquid storage structure

Info

Publication number: WO2019103096A1
Application number: PCT/JP2018/043178
Authority: WO
Inventors: 秀一平野
Original assignee: いすゞ自動車株式会社
Priority date: 2017-11-27
Filing date: 2018-11-22
Publication date: 2019-05-31
Also published as: PH12020550681A1; CN111386394A; JP2019094868A; JP6928215B2; CN111386394B

Abstract

This liquid storage structure is provided with: a liquid storage unit in which a liquid is stored; a vibration source; and a baffle plate. The baffle plate has a lower surface including a recess which is opened downward. As the liquid surface level in the liquid storage unit increases and the liquid surface reaches the lower surface, a space defined by the liquid surface and the recess is formed. The recess has a shape which is set such that the natural frequency on the vibrated side including the liquid storage unit and the liquid in the liquid storage unit does not coincide with the natural frequency of the vibration source.

Description

Liquid storage structure

The present disclosure relates to a liquid storage structure, and more particularly, to a technology in which a baffle plate is provided in an oil pan that stores engine oil.

Generally, an oil pan for storing engine oil is provided at a lower portion of a cylinder block of the engine. The engine oil stored in the oil pan is pumped up by an oil pump driven by the power of the engine, supplied to each sliding element of the engine, and then circulated to the oil pan (for example, Patent Document 1) reference).

Japanese Patent Application Laid-Open No. 11-280547

By the way, vibration is transmitted to the oil pan and the engine oil stored in the oil pan as the oil pump sucks the oil. For this reason, when the natural frequency of the vibration source mainly composed of an oil pump or the like and the natural frequency of the vibration receiving side including the oil pan and engine oil in the oil pan coincide with each other, these resonances are caused. Noise may occur. Such noise may cause the driver or the like to feel uncomfortable, so it is desirable to effectively suppress the generation of the noise.

The technology of the present disclosure relates to the liquid storage structure, and effectively suppresses the generation of noise.

The technology of the present disclosure is a liquid storage structure including a liquid storage unit that stores a liquid, the liquid storage unit, an excitation source that applies vibration to the liquid in the liquid storage unit, and a baffle plate. The lower surface of the baffle plate faces the liquid surface of the liquid stored in the liquid storage portion, and the lower surface of the baffle plate includes a recess opened downward, and the liquid surface level in the liquid storage portion rises with the rise. When the liquid level reaches the lower surface, a space defined by the liquid level and the recess is formed, and the natural frequency of the liquid reservoir and the excitation side including the liquid in the liquid reservoir and the natural frequency The shape of the recess is set so that the natural frequency of the vibration source does not match.

In the liquid storage structure described above, the natural vibration characteristic on the side to be excited has a maximum value of amplitude in two frequency bands different from the natural frequency of the vibration source due to the influence of the resonance frequency of the closed space. The shape of the recess may be set to be a characteristic.

In the above liquid storage structure, the frequency characteristic on the side to be excited has maximum values of amplitude in two frequency bands under the influence of the resonance frequency of the closed space, whereby any one of the maximum values is the excitation The baffle plate may be provided with a through hole communicating with the recess to allow air to escape from the closed space if it matches the natural frequency of the source.

In the liquid storage structure described above, the recess may be formed by being partitioned by a plurality of reinforcing ribs provided on the lower surface of the baffle plate.

In the liquid storage structure described above, the liquid storage portion is an oil pan provided at a lower portion of an engine, the liquid is engine oil stored in the oil pan, and the vibration source is an oil for pumping up the engine oil. It may be a pump.

According to the technology of the present disclosure, the generation of noise can be effectively suppressed with respect to the liquid storage structure.

FIG. 1 is a schematic view showing a liquid storage structure according to the present embodiment. FIG. 2A is a schematic perspective view of the baffle plate according to the present embodiment as viewed obliquely from below. FIG. 2B is a schematic perspective view of the baffle plate according to the present embodiment as viewed obliquely from below. FIG. 3 is a schematic view for explaining the natural vibration characteristic on the vibration receiving side of the liquid storage structure according to the present embodiment. FIG. 4 is a schematic view showing a liquid storage structure according to another embodiment. FIG. 5 is a schematic view for explaining the natural vibration characteristic on the vibration receiving side of the liquid storage structure according to another embodiment.

Hereinafter, the liquid storage structure according to the present embodiment will be described based on the attached drawings. The same parts are given the same reference numerals, and their names and functions are also the same. Therefore, detailed description about them will not be repeated.

FIG. 1 is a schematic view showing a liquid storage structure 1 according to the present embodiment. The liquid storage structure 1 is, for example, an engine oil storage structure that lubricates each sliding element of the engine E, and includes an oil pan 10 fixed to the lower part of a cylinder block (crankcase) CB and a baffle plate 20 Have.

Engine oil O is stored in the oil pan 10. An oil strainer 11 for removing foreign matter contained in the engine oil O is immersed in the engine oil O in the oil pan 10. Further, the oil strainer 11 is connected to an oil pump 13 that pumps up the engine oil O via a suction pipe 12.

The oil pump 13 is an example of an excitation source that applies vibration to the engine oil O stored in the oil pan 10 or the oil pan 10. For example, the oil pump 13 is driven by power extracted from a crankshaft (not shown) of the engine E Do. After the engine oil O pumped up from the oil pan 10 by the drive of the oil pump 13 is supplied to each sliding element such as a valve mechanism (not shown) of the engine E, the oil pan 10 via a return piping (not shown). Is supposed to be circulated.

The baffle plate 20 is, for example, a plate member for securing the liquid surface stability and rigidity of the engine oil O stored in the oil pan 10, and the peripheral portion thereof is the inner wall of the oil pan 10 or the engine E It is fixed to the site of Further, on the lower surface of the baffle plate 10 facing the liquid surface L of the engine oil O, a plurality of recessed portions 21 are opened.

Specifically, as shown in FIG. 2A, the recess 21 extends along the periphery of the lower surface of the baffle plate 20 in a substantially rectangular shape, and extends diagonally inside the periphery reinforcing rib 22. It is sectioned and formed by a plurality of (two in the illustrated example) inclined reinforcing ribs 23 which cross each other. Incidentally, as shown in FIG. 2B, the recess 21 may be divided and formed by the peripheral reinforcing rib 22 and a plurality of lattice reinforcing ribs 24 provided in a lattice shape in the peripheral reinforcing rib 22.

As shown in FIG. 1, when the fluid level L of the engine oil O rises according to the driving state of the oil pump 13 and the fluid level L reaches the lower surface of the baffle plate 20 as shown in FIG. A closed space S for sealing the air is formed by the liquid surface L and the recess 21. That is, the baffle plate 20 is configured not to have a through hole or the like that communicates the lower surface and the upper surface or the side surface of the baffle plate 20 at least in the range where the recess 21 is formed.

By the way, when vibration is transmitted to the oil pan 10 and the engine oil O in the oil pan 10 with the oil suction of the oil pump 13, the natural frequency of the oil pump 13 (hereinafter simply referred to as a vibration source) and The resonance may occur when the natural frequencies of the oil pan 10 and the engine oil O in the oil pan 10 (hereinafter, these are simply referred to as the vibration receiving side) coincide with each other.

In the present embodiment, in order to prevent such resonance, the natural vibration characteristic on the excitation side is influenced by the resonance frequency of the closed space S, and thus one peak of the amplitude shown by the broken line in FIG. Space volume and / or opening area of the recess 21 so as to change from the characteristic line L1 having only the characteristic line L1 to the characteristic line L2 having the maximum values P1 and P2 of amplitude in two different frequency bands as shown by solid lines. The numerical value is set. The numerical values such as the space volume and the opening area are not uniquely determined, and may be appropriately set by experiments according to the specifications of the engine E, the capacity of the oil pump 13, the shape of the oil pan 10, and the like.

As described above, when the natural vibration characteristics on the side to be vibrated are changed, the natural frequency on the side to be vibrated does not match the natural frequency of the vibration source, so that these resonances are reliably prevented. As a result, it is possible to effectively suppress the generation and damage of noise caused by resonance.

The present invention is not limited to the embodiment described above, and can be appropriately modified and implemented without departing from the spirit of the present invention.

For example, when the frequency characteristic on the excitation side has maximum values P1 and P2 of amplitude in two different frequency bands under the influence of the resonance frequency of the closed space S, either one of these maximum values P1 and P2 is added. If it matches with the natural frequency of the vibration source, as shown in FIG. 4, it is preferable to provide the baffle plate 20 with a through hole 25 communicating with the recess 21 to release the air in the closed space S. According to this configuration, the characteristic vibration characteristic on the side to be excited has only one peak in the amplitude shown by the solid line from the characteristic line L3 having two maximum values P1 and P2 in the amplitude shown by the broken line in FIG. It changes to the characteristic line L4 which it has, and it becomes possible to effectively prevent the generation of noise due to resonance, breakage, and the like.

In the above embodiment, the recess 21 is described as being divided into a plurality of sections by the reinforcing

ribs

22, 23, 24. However, the number of the recess 21 may be only one, and further, it may be other than the reinforcing rib It may be sectioned by other projections or the like.

Moreover, although the liquid storage structure 1 of the said embodiment was demonstrated to the oil pan 10 of the engine E as an example, it is possible to apply widely also to other liquid storage structures, such as an oil pan and a fuel tank of a transmission.

This application is based on Japanese Patent Application (Japanese Patent Application No. 2017-226578) filed on November 27, 2017, the contents of which are incorporated herein by reference.

The present invention relates to a liquid storage structure, and can effectively suppress the generation of noise.

DESCRIPTION OF SYMBOLS 1 Liquid storage structure 10 Oil pan 11 Oil strainer 12 Suction pipe 13 Oil pump 20 Baffle plate 21 Recess 22 Peripheral reinforcing rib 23 Inclined reinforcing rib 24 Grid-like reinforcing rib 25 Through hole

Claims

A liquid storage unit for storing liquid;
The liquid storage unit, and a vibration source that applies vibration to the liquid in the liquid storage unit;
A liquid storage structure comprising a baffle plate,
The lower surface of the baffle plate faces the surface of the liquid stored in the liquid storage portion,
The lower surface of the baffle plate includes a recess that opens downward,
When the liquid level reaches the lower surface as the liquid level in the liquid reservoir rises, a space defined by the liquid level and the recess is formed.
The shape of the recess is set such that the natural frequency of the liquid storage portion and the vibration-excitation side containing the liquid in the liquid storage portion does not match the natural frequency of the vibration source.
The natural vibration characteristics on the side to be excited become the frequency characteristics having maximum values of amplitude in two frequency bands different from the natural frequency of the excitation source under the influence of the resonance frequency of the closed space. The liquid storage structure according to claim 1, wherein a shape of the recess is set.
The recess is formed by being divided by the lower surface of the baffle plate and a plurality of reinforcing ribs provided on the lower surface of the baffle plate.
The baffle plate forms a closed space by the liquid surface and the recess without connecting the lower surface of the baffle plate and the upper surface of the baffle plate at least in a range where the recess is formed.
The liquid storage structure according to claim 1.
The recess is formed by being divided by the lower surface of the baffle plate and a plurality of reinforcing ribs provided on the lower surface of the baffle plate.
The baffle plate forms a closed space by the liquid surface and the recess without connecting the lower surface of the baffle plate and the upper surface of the baffle plate at least in a range where the recess is formed.
The liquid storage structure according to claim 2.
The liquid storage structure according to claim 1, wherein the baffle plate is provided with a through hole communicating with the recess to release air from the space.
The liquid reservoir is an oil pan provided at a lower portion of an engine, the liquid is engine oil stored in the oil pan, and the vibration source is an oil pump for pumping up the engine oil. The liquid storage structure according to any one of 5.