KR20200006336A - Oil pump - Google Patents

Abstract

The present invention provides an oil pump for suctioning oil from an external oil pan and supplying the suctioned oil. The oil pump comprises: a body in which a suction line suctioning the oil and a supply line supplying the oil suctioned through the suction line to each friction part of an engine are formed, and which provides an oil valve chamber for the inflow and outflow of the oil at one side therein; an outer rotor which is rotatably provided inside the body, has a rotary chamber formed therein, and receives the pressure of the oil in the oil valve chamber at one side; an inner rotor provided to be eccentric with respect to the outer rotor and including a plurality of vanes which rotate in conjunction with the rotation of a drive shaft of the engine, and is radially and slidably coupled to an outer circumferential surface, wherein the plurality of vanes feed the oil to the supply line while one end is in contact with an inner circumferential surface of the outer rotor; a support spring which has one end in contact with a spring support portion formed on an outer side surface of the outer rotor and the other end in contact with an inner side surface of the rotary chamber, and which supports the outer rotor; and a thermostat disposed at one end of the support spring, wherein the length of the thermostat is stretched in accordance with the temperature of the oil supplied from the body.

Description

Oil pump

The present invention relates to an oil pump, and more particularly, to an oil pump in which a thermostat that expands and contracts in response to an oil temperature is disposed.

In general, an internal combustion engine such as a vehicle is driven by a high speed and high pressure of a piston and an explosive stroke of a mixer, so that the inside of the cylinder is driven under conditions of high temperature and high pressure.The cylinder wall and the sliding surface of the piston, and the crankshaft and camshaft, etc. It is important to supply oil continuously.

As such, an oil pump for pumping oil is widely used to supply oil for lubrication and cooling of the engine.

The oil pump has gear type, vane type and piston type according to the structure. In addition, the oil pump includes a constant delivery pump in which the discharge amount of the pump is always constant according to the load variation, and a variable delivery pump in which the discharge amount is changed according to the load variation.

1 is a view showing an example of the configuration of an oil pump according to the prior art. Referring to FIG. 1, the oil pump 1 according to the related art includes a main body 2, an inner rotor 3 that is rotated by the driving force of the engine, and an outer rotor installed eccentrically with the inner rotor 3 ( 4) While the outer rotor 4 is elastically supported, while the outer rotor 4 and the inner rotor 3 are in contact with the inner circumferential surfaces of the support spring 5 and the outer rotor 4 which are kept eccentrically positioned with each other. A plurality of vanes 6, which rotate to feed oil outwardly, are included as a representative component.

As shown in FIG. 1, the conventional oil pump has an eccentric change only by the discharge pressure of the oil discharged from the oil pump, and has a structure in which the system resistance of the engine that changes with temperature is not considered.

Therefore, the conventional oil pump can be supplied with the required amount of oil corresponding to the engine speed in the state where the oil temperature is sufficiently raised, but in the cold start more than the required amount of oil is supplied Therefore, there is a problem that the fuel economy of the vehicle is lowered by using the driving force of the engine more than necessary.

Prior art for the present invention can be exemplified in Patent Publication No. 2017-0020585.

The present invention has been made to solve the above problems, by arranging a thermostat to expand and contract in response to the temperature of the oil supplied by the oil pump and to change the elasticity of the support spring does not sufficiently increase the temperature of the oil It is an object of the present invention to provide an oil pump in which a variable time point at which the oil supply pressure is lowered in a non-state state appears more quickly so that the required amount of oil is supplied.

In order to achieve the above object, the present invention provides an oil pump for sucking oil from an external oil pan and supplying the sucked oil, the suction line for sucking the oil, and the oil sucked through the suction line. A body configured to supply a supply line to each friction part of the engine, and to provide an oil valve chamber into and out of the oil to one side thereof; An outer rotor rotatably installed inside the body and having a rotary chamber formed therein and receiving a pressure of the oil in the oil valve chamber to one side; A plurality of eccentrically installed with respect to the outer rotor and rotated in accordance with the rotation of the drive shaft of the engine and coupled to the outer circumferential surface so as to slidably coupled to the outer circumferential surface and one end portion in contact with the inner circumferential surface of the outer rotor to pump the oil to the supply line An inner rotor including a vane; One end is in contact with the spring support formed on the outer surface of the outer rotor and the other end is in contact with the inner surface of the rotary chamber, the support spring for supporting the outer rotor and one end of the support spring is disposed, the supply from the body It provides an oil pump including a thermostat length is stretched according to the temperature of the oil.

The thermostat may be arranged in parallel with the support spring in the length change direction.

The thermostat may include a cylindrical body and wax disposed inside the body.

The wax may have an operating temperature of -40 to 150 ° C.

The main body may include an end disposition plate disposed at both ends of the main body, and a tube including an elastic body and connecting the end disposition plate.

The present invention as described above, by arranging a thermostat that expands and contracts in response to the temperature of the oil supplied by the oil pump and the elasticity of the support spring is changed, the oil supply pressure in the state that the oil temperature is not sufficiently raised The variable time point that is lowered has an effect of appearing faster.

1 is a view showing an example of the configuration of an oil pump according to the prior art.
2 is a view showing the configuration of an oil pump according to an embodiment of the present invention.
3 is a cross-sectional view showing an example of the configuration of the thermostat used in the present invention.
Figure 4 is a graph showing the oil pressure of the oil supplied by the oil pump according to the prior art and the oil pump according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a view showing the configuration of an oil pump according to an embodiment of the present invention.

Referring to FIG. 2, the oil pump 100 includes a body 110, an outer rotor 120, an inner rotor 130, a support spring 140, and a thermostat 150.

Body 110 is formed with a suction line (not shown) for sucking the oil from the oil pan, and a supply line (not shown) for supplying the oil introduced from the suction line to each friction portion of the engine. An oil valve chamber 114 is formed at a predetermined position on one side of the body 110 to allow oil to flow in and out from the suction line and the supply line.

The oil introduced into the body 110 is supplied to each part of the engine through a supply line, and is then bypassed to the oil valve chamber 114 which is a space between the body 110 and the outer rotor 120. do.

The pressure of the oil supplied to the oil valve chamber 114 may be applied to one side of the outer rotor 120 to be described later to change the eccentricity of the outer rotor 120 and the inner rotor 130 to be described later.

The outer rotor 120 is formed in a substantially ring shape. The outer rotor 120 is installed in the inner space of the body 110 by a connecting shaft 121 formed on the outer side of the outer rotor 120.

The outer rotor 120 is rotated by a predetermined angle with respect to the connecting shaft 121 and eccentrically with the inner rotor 130 to be described later by a predetermined amount. The inner rotor of the outer rotor 120 is formed with a rotary chamber 128 in which vanes 132 and rings 136, which will be described later, are installed. The rotary chamber 128 is formed in a circular shape, and is formed concentrically with the outer rotor 120.

On the outer side of the outer rotor 120, a spring support 122 is formed.

The spring support part 122 contacts the one end of the support spring 140 to be described later to support the support spring 140.

The spring support part 122 is formed in the shape of a rod formed in a predetermined length and width. The spring support part 122 transmits the elastic force of the support spring 140 to the outer rotor 120 so that the outer rotor 120 and the inner rotor 130 are eccentric, and the support spring (120) when the outer rotor 120 is rotated. 140) to be compressed.

The spring support part 122 has an escape prevention end 123 formed at a predetermined height toward the support spring 140 at the end thereof. The release preventing end 123 prevents one end of the support spring 140 from being separated on the spring support part 122 during the low speed operation.

Inner rotor 130 is rotatably installed on the inner surface of the body (110). The inner rotor 130 is rotated by receiving a rotational force from the drive shaft of the engine.

The inner rotor 130 is formed in a circular shape. The inner rotor 130 may be smaller than the diameter of the rotary chamber 128, and may rotate inside the rotary chamber 128. The rotating shaft connected to the inner rotor 130 is connected to the outside through the body 110. The central axis of the rotary chamber 128 is kept unmoved and is eccentric with respect to the outer rotor 120.

The vanes 132 are coupled to the inner rotor 130 and the outer circumferential surface of the inner rotor 130 to be slidably radially. The vane 132 is used in plurality.

Here, the plurality of vanes 132, the outer end is in contact with the inner circumferential surface of the outer rotor 120 as the inner rotor 130 is rotated out of the radial rotation, the embodiment of the present invention is the outer end of the vane 132 A ring 136 is provided to contact the end of the vane 132 so as to be in uniform contact with the inner circumferential surface of the outer rotor 120.

Support spring 140 is installed on one side of the body 110, one end is supported in contact with the spring support portion 122 of the outer rotor 120, the other end is supported on the inner side of the body (110). Here, the support spring 140 allows the outer rotor 120 and the inner rotor 130 to be described later to be eccentric by a predetermined amount by the elastic force of the spring. The amount of oil pumped to each part of the engine is controlled according to the eccentricity of the outer rotor 120 and the inner rotor 130.

The thermostat 150 is disposed at one end of the support spring 140. Thermostat 150 is stretched in length corresponding to the temperature of the oil supplied from the body (110).

When the thermostat 150 is disposed, the length change direction of the thermostat 150 is disposed in parallel with the support spring 140. More preferably, the central axis of the thermostat 150 is disposed to coincide with the central axis of the support spring 140.

Therefore, the compression degree of the support spring 140 is changed according to the change in the length of the thermostat 150. In this embodiment, the thermostat 150 is disposed at opposite ends of the separation prevention end 123 of both ends of the support spring 140, but may be disposed at the end of the separation prevention end 123 according to the user's needs. .

Here, the thermostat 150 may be configured as follows.

The thermostat 150 includes a body 152 and a wax 156.

The main body 152 has a cylindrical shape having a predetermined diameter and height. Here, the diameter of the main body 152 corresponds to the diameter of the support spring 140. The height of the main body 152 may be set in various ways according to the needs of the user.

Here, both ends of the main body 152 are disposed with an end placement plate 152A made of a predetermined metal or hard plastic, and the end placement plates 152A at both ends are placed in a tube 152B made of an elastic body such as rubber. Is connected by. Accordingly, the length of the tube 152B may vary depending on the volume change of the wax described later, but the diameter does not change. Here, the material of the tube 152B preferably has heat durability that is not damaged by oil temperature.

Wax 156 is filled in the body 152 in a predetermined amount. The wax 156 increases or decreases in volume depending on the temperature of the oil. Wax 156 may have an operating temperature of -40 to 150 ° C.

The length of the main body 152 is changed according to the volume increase or decrease of the wax 156, and thus the elastic force of the support spring 140 connected to one end of the main body 152 may be changed. In the present embodiment, although the wax is filled in the main body 152, various materials may be used according to the user's needs as long as it can shrink and expand according to the temperature.

Wax 156 is to maintain the contracted state at room temperature, it is preferable that the length of the thermostat 150 is connected to the support spring 140 in a shortened state. Therefore, it is preferable that the elastic force of the support spring 140 is maintained in a reduced state at the initial operation of the engine.

The oil supply using the oil pump according to the present invention configured as described above will be described.

First, when the engine operates, the oil of the oil pan (not shown) is introduced into the body 110 through the suction pipe (not shown), and the introduced oil is introduced into each friction portion of the engine through the supply line by the vane 132. Is supplied.

The supplied oil is then bypassed and supplied to the oil valve chamber 114, which is a space between the inner surface of the body 110 and the outer rotor 120.

The pressure of the oil supplied to the oil valve chamber 114 is applied to the outer rotor 120.

In the initial stage of engine operation, the oil in the oil valve chamber 114 is smaller than the elastic force of the support spring 140, so as to maintain the eccentricity of the outer rotor 120 and the inner rotor 130 as shown in FIG.

Initially, the temperature of the oil may be at room temperature.

In this state, the engine speed is gradually increased to increase the pressure of oil flowing into the oil valve chamber 114. The oil pressure of the oil valve chamber 114 is applied to the outer rotor 120, and when the applied pressure is greater than the elastic force of the support spring 140, the outer rotor 120 subjected to the pressure is clocked around the rotating shaft 121. Direction, the support spring 140 is compressed, and the degree of eccentricity between the outer rotor 120 and the inner rotor 130 is reduced.

The flow rate of the oil supplied by the reduction of the eccentricity of the outer rotor 120 and the inner rotor 130 may be reduced so that the pressure increase of the oil may be limited.

Figure 4 is a graph showing the hydraulic pressure of the oil supplied by the oil pump according to the prior art and the oil pump according to an embodiment of the present invention.

Referring to Figure 4, it will be described with respect to the pressure of the oil supplied using the oil pump 1 according to the prior art and the oil pump 100 according to an embodiment of the present invention.

In the case of a hot start in which the engine is started while the engine coolant temperature is above a certain level, the oil temperature is above a certain level.

In this state, when the engine speed increases, the oil pump 1 according to the prior art and the oil pump 100 according to the embodiment of the present invention have the same pressure change of the oil supplied as the engine speed increases, It can be seen that the same time point in which the eccentricity between the outer rotor 120 and the inner rotor 130 is reduced to limit the increase in the oil pressure (see FIG. 5A).

On the other hand, when the engine is started (cold start) while the engine is not operated for a predetermined time, the change in the supply pressure of oil is as follows.

First, the oil supply pressure change when the oil pump 1 according to the related art is used will be described.

When the engine is started, the pressure of the oil supplied from the oil pump 1 according to the related art and the oil pump 100 according to the embodiment of the present invention may be the same.

After the operation of the engine is started, if the engine speed increases, the pressure of the oil supplied in the oil pump 1 increases. It can be seen that the increase in the oil pressure is limited by reducing the eccentricity between the outer rotor 120 and the inner rotor 130 at a time when the engine speed increases more than a predetermined time (about 1500 rpm) (see FIG. 5B). Here, when cold starting at the same rotational speed, it can be seen that the oil supply pressure is greater than in the case of hot starting.

An oil supply pressure change when using the oil pump 100 according to the present invention will be described.

In the oil pump 100 operated by the rotational force of the engine, oil is supplied at a predetermined pressure, and the oil supply pressure increases as the rotation speed of the engine increases.

Here, until the engine speed increases to a certain level (about 1000 rpm), it shows the same oil supply pressure as the oil pump 1 according to the prior art.

At this time, until the engine speed increases to a certain degree (about 1000 rpm), the temperature of the oil does not rise so that the thermostat 150 remains in a contracted state, and thus the elastic force of the support spring 140 is reduced. It is a state.

If the temperature of the oil rises above a certain level, the wax 156 increases in volume and the length of the thermostat 150 increases.

As the length of the thermostat 150 increases, the support spring 140 is compressed, and the elastic force of the support spring 140 increases.

Eccentricity of the eccentricity of the outer rotor 120 and the inner rotor 130 is increased by the increase of the elastic force of the support spring 140, and thus the flow rate of the oil supplied by the degree reduction is reduced so that the pressure increase of the oil may be limited. Can be.

It can be seen that the engine supply pressure thereafter is in the same state as the hot start (see FIG. 5C).

As described above, the oil pump 100 according to the present invention can be set faster than the pressure variable time of the oil supplied when compared with the conventional oil pump (1).

The present invention, by arranging a thermostat that expands and contracts in response to the temperature of the oil supplied by the oil pump and the elasticity of the support spring is changed to change the oil supply pressure is lowered in the state that the oil temperature is not sufficiently increased The point of view is faster.

Although the present invention has been described with reference to the embodiments shown in the drawings, this is merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

100: oil pump
110: body 120: outer rotor
130: inner rotor 140: support spring
150: thermostat

Claims (5)

An oil pump which sucks oil from an external oil pan and supplies the sucked oil,
A suction line for sucking the oil, and a supply line for supplying the oil sucked through the suction line to each friction portion of the engine is formed, providing an oil valve chamber in which the oil is introduced into and out of the one side Body;
An outer rotor rotatably installed inside the body and having a rotary chamber formed therein and receiving a pressure of the oil in the oil valve chamber to one side;
A plurality of eccentrically installed with respect to the outer rotor and rotates in accordance with the rotation of the drive shaft of the engine and coupled to the outer circumferential surface so as to slidably coupled to the outer circumferential surface and one end portion in contact with the inner circumferential surface of the outer rotor to pump the oil to the supply line An inner rotor including a vane;
A support spring having one end in contact with a spring support formed on an outer side of the outer rotor and the other end in contact with an inner side of the rotary chamber, and supporting the outer rotor;
An oil pump disposed at one end of the support spring and including a thermostat, the length of which is stretched according to the temperature of the oil supplied from the body. The method of claim 1,
The thermostat is,
An oil pump having a longitudinal change direction parallel to the support spring. The method of claim 2,
The thermostat is,
With a cylindrical body,
An oil pump comprising a wax disposed inside the main body. The method of claim 3,
The wax has an oil pump having an operating temperature of -40 to 150 ℃. The method of claim 3,
The main body,
An end disposition plate disposed at both ends of the main body;
An oil pump comprising an elastic body and a tube connecting said end placement plate.

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