JP2018112253A - Oil supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an oil supply device which can quickly supply a lubricant to a lubrication-necessary region when an oil pump is restarted from a stopped state.SOLUTION: An oil supply device 5 comprises: an oil storage part 5a for storing a lubricant; an oil pump 5c for sucking the lubricant from the oil storage part 5a which is installed at a lower side by using power from a drive unit which makes a vehicle travel, and supplying the lubricant to a lubrication-necessary region 5e; and an oil passage 5b communicating with the lubrication-necessary region 5e from the oil storage part 5a via the oil pump 5c. When the oil pump 5c is stopped in at least a part between the oil storage part 5a and the lubrication-necessary region 5e, the oil passage 5b forms an oil sump Q which is held at a position whose oil level is higher than an oil level of the oil storage part 5a.SELECTED DRAWING: Figure 1

Description

  The present disclosure relates to an oil supply apparatus.

  2. Description of the Related Art An oil supply device that is mounted on a vehicle and drives oil pumps using power output from an engine or a drive motor and supplies lubricating oil to parts that require lubrication such as gears and bearings of the vehicle is known. (For example, refer to Patent Document 1).

Japanese Patent Laid-Open No. 2001-233300

  By the way, this type of oil supply device has a structure in which when the oil pump is stopped, the lubricating oil inside the oil passage is collected in an oil reservoir provided below.

  For this reason, for example, when the vehicle is left for a long time without being driven, the lubricating oil in the oil passage falls downward, and when it is started thereafter, the rise of the hydraulic pressure is delayed, and the portion requiring lubrication (for example, A time lag occurs until the lubricating oil is supplied to the gear portion and the bearing portion). As a result, before the lubricating oil is supplied, there is a possibility that seizure occurs in the lubrication-necessary portion.

  The present disclosure has been made in view of the above problems, and an oil supply device that can supply lubricating oil to a portion requiring lubrication at an early stage when the oil pump is restarted from a stopped state. The purpose is to provide.

  The main present disclosure that solves the above-described problem is that oil is stored from the oil storage section that is disposed on the lower side by using power from an oil storage section that stores lubricating oil and a driving device that drives the vehicle. An oil pump that sucks and supplies the lubricating oil to the necessary portion of the lubricating oil, and an oil passage that leads from the oil reservoir to the necessary portion of the lubricating oil via the oil pump. An oil that forms an oil reservoir in which the oil level is held at a position higher than the oil level of the oil reservoir when the oil pump is stopped in at least a portion between the reservoir and the lubricating oil required portion. It is a supply device.

  According to the oil supply device according to the present disclosure, when the oil pump is restarted from a stopped state, the lubricating oil can be supplied to the site requiring lubrication at an early stage.

The figure which shows an example of a structure of the oil supply apparatus which concerns on 1st Embodiment. The figure which represented typically operation | movement of the oil supply apparatus at the time of providing the one-way valve which concerns on 1st Embodiment. The figure which represented typically operation | movement of the oil supply apparatus when the one-way valve which concerns on 1st Embodiment is not provided. The figure which shows an example of a structure of the oil supply apparatus which concerns on 2nd Embodiment.

(First embodiment)
Hereinafter, the oil supply apparatus according to the first embodiment will be described with reference to FIGS.

  FIG. 1 is a diagram illustrating an example of the configuration of the oil supply device 5.

  The oil supply device 5 according to the present embodiment is applied to a transfer A of a vehicle as an example, and supplies lubricating oil to the gear unit 3, the bearing unit 4, and the like.

  For example, the transfer A distributes power generated by an engine (not shown) to the front wheels and the rear wheels. The transfer A includes a gear portion 3, a bearing portion 4, an input shaft 1, a front wheel side output shaft 2 a, a rear wheel side output shaft 2 b, an oil supply device 5, and the like, and these are accommodated in an internal space of the housing 6.

  The input shaft 1 of the transfer A is connected to the output shaft (not shown) of the speed reducer, and the power generated by the engine is transmitted to the input shaft 1 of the transfer A via the output shaft of the speed reducer. The gear part 3 is comprised by the planetary gear mechanism etc., for example, and distributes the motive power transmitted to the input shaft 1 with respect to the front-wheel side output shaft 2a and the rear-wheel side output shaft 2b. The front wheel side output shaft 2a transmits power to the front wheels, and the rear wheel side output shaft 2b transmits power to the rear wheels. The input shaft 1, the front wheel side output shaft 2 a, and the rear wheel side output shaft 2 b are each supported by the housing 6 via a bearing portion 4 so as to be rotatable.

  The oil supply device 5 supplies the lubricating oil to the lubrication required portion 5e of the transfer A through the oil passage 5b. The “lubrication required part 5e” is a part that needs to be lubricated with lubricating oil, and includes, for example, a connecting part between gears of the gear part 3 and a bearing part of the bearing part 4.

  The oil supply device 5 includes an oil reservoir 5a, an oil passage 5b, and an oil pump 5c.

  The oil storage part 5 a stores lubricating oil at the bottom of the housing 6 of the transfer A. Needless to say, the oil reservoir 5a does not necessarily have a tank shape.

  The oil pump 5c sucks the lubricating oil stored in the oil storage portion 5a disposed on the lower side through the oil passage 5b into the suction port 5c1. Then, the oil pump 5c discharges the lubricating oil from the discharge port 5c2, and supplies the lubricating oil to the lubrication required portion 5e through the oil passage 5b.

  The oil pump 5 c is connected to the input shaft 1 and is driven so as to interlock with the rotation of the input shaft 1. For example, a trochoid pump is used as the oil pump 5c.

  The oil passage 5b is a supply route for lubricating oil from the oil reservoir 5a to the lubrication required portion 5e. The oil passage 5b according to the present embodiment is formed in the oil pipe routed from the oil reservoir 5a to the suction port 5c1 of the oil pump 5c, and the shaft of the input shaft 1 from the discharge port 5c2 of the oil pump 5c. A communication hole is included. In FIG. 1, the lubricating oil supply path is indicated by an arrow (in FIG. 1, a part of the oil passage 5 b is hidden behind the back portion of the gear portion 3 and the like).

  The lubricating oil in the oil passage 5b is supplied to the lubrication-needed portion 5e, and then scatters and flows through the wall portion of the housing 6 to the oil storage portion 5a.

  In the present embodiment, the oil passage 5b is provided with the one-way valve 5d so that the oil level in the oil passage 5b does not drop even after the oil pump 5c is stopped.

  The one-way valve 5d is opened when the lubricating oil flows in the direction from the oil reservoir 5a toward the suction port 5c1 of the oil pump 5c. The one-way valve 5d is lubricated from the suction port 5c1 of the oil pump 5c to the oil reservoir 5a. The valve body closes in the direction in which the oil flows, and the lubricating oil flows only in one direction. More specifically, the one-way valve 5d is disposed at a connection position between the oil reservoir 5a and the oil passage 5b (oil pipe). In addition, by disposing the one-way valve 5d at the connection position between the oil reservoir 5a and the oil passage 5b, even after the oil pump 5c is stopped, a larger amount of lubricating oil enters the oil passage 5b on the downstream side of the oil passage 5b. It is supposed to remain.

  FIG. 2 schematically shows the operation of the oil supply device 5 when the one-way valve 5d is provided. FIG. 3 schematically shows the operation of the oil supply device 5 when the one-way valve 5d is not provided (prior art) as a comparative example. 2 and 3 show the state of the oil level in the oil passage 5b when the oil pump 5c is stopped, and the right figure shows that the lubricating oil is applied to the lubrication required portion 5e when the oil pump 5c is restarted. The time lag until it is supplied is schematically represented.

  In the oil supply apparatus according to the prior art, as shown in FIG. 3, when the vehicle is left for a long time without driving, the lubricating oil in the oil passage 5 b falls downward. Therefore, when the vehicle is subsequently started, the rise of the hydraulic pressure is delayed, and a time lag occurs until the lubricating oil is supplied to the lubrication required portion 5e.

  On the other hand, in the oil supply device 5 according to the present embodiment, as shown in FIG. 2, by providing the one-way valve 5d, the oil level is maintained in the oil passage 5b even when the oil pump 5c is stopped for a long time. The oil pump 5c can be kept in a liquid-tight state while maintaining a high position. In other words, when the oil pump 5c is stopped, the one-way valve 5d disposed in the oil passage 5b is held in the oil passage 5 at a position where the oil level is higher than the oil level of the oil reservoir 5a. An oil reservoir Q is formed. Therefore, the oil pump 5c can quickly supply the lubricating oil to the lubrication required portion 5e immediately after the vehicle is started.

  As described above, according to the oil supply device 5 according to the present embodiment, even when the oil pump 5c is stopped by the one-way valve 5d provided in the oil passage 5b, the oil level remains high in the oil passage 5b. Will be maintained. Therefore, the lubricating oil can be quickly supplied to the lubrication required portion 5e immediately after the vehicle is started.

(Second Embodiment)
The oil supply device 5 according to the present embodiment is provided with a bent portion 5bs in the middle of the oil passage 5b as a configuration for maintaining the oil level at a high position in the oil passage 5b when the oil pump 5c is stopped. This is different from the first embodiment.

  FIG. 4 is a diagram illustrating an example of the configuration of the oil supply device 5 according to the present embodiment. FIG. 4 schematically shows the oil reservoir 5a, the oil passage 5b, and the oil pump 5c corresponding to FIG.

  The bent portion 5bs is formed, for example, by bending an oil pipe (oil passage 5) up and down between the oil storage portion 5a and the oil pump 5c. At this time, the bottom part which is the lowest part of the bent part 5bs is arranged to be higher than the oil level of the oil storage part 5a.

  With this configuration, when the oil pump 5c is stopped, a part of the lubricating oil remains in the bent portion 5bs without returning to the oil storage portion 5a. In other words, the bent portion 5bs formed in the oil passage 5b forms an oil reservoir portion Q in the oil passage 5b when the oil pump 5c is stopped.

  Note that the amount of lubricating oil remaining in the bent portion 5bs can be adjusted by appropriately changing the diameter and length of the bent portion 5bs.

  As described above, according to the oil supply device 5 according to the present embodiment, even when the oil pump 5c is stopped for a long period of time by the bent portion 5bs provided in the oil passage 5b, as in the first embodiment, the oil surface Will remain high. Therefore, the lubricating oil can be quickly supplied to the lubrication required portion 5e immediately after the vehicle is started.

  In the above-described embodiment, the mode applied to the transfer A is shown as an example of the oil supply device 5. However, it is needless to say that the oil supply device 5 described above can be similarly applied to a reduction gear, an engine, and the like in addition to the transfer A.

  As mentioned above, although the specific example of this invention was demonstrated in detail, these are only illustrations and do not limit a claim. The technology described in the claims includes various modifications and changes of the specific examples illustrated above.

  The present disclosure can be suitably used for an oil supply device that supplies lubricating oil to a portion of a vehicle that requires lubrication.

A Transfer 1 Input shaft 2a Front wheel side output shaft 2b Rear wheel side output shaft 3 Gear portion 4 Bearing portion 5 Oil supply device 5a Oil storage portion 5b Oil passage 5c Oil pump 5d One-way valve 5bs Bending portion 6 Housing

Claims (4)

An oil reservoir for storing lubricating oil;
An oil pump that draws lubricating oil from the oil reservoir disposed on the lower side using power from a driving device that drives the vehicle, and supplies the lubricating oil to a portion requiring the lubricating oil;
An oil passage that leads from the oil reservoir through the oil pump to a lubricating oil required portion,
The oil passage is oil that is held at a position where the oil level is higher than the oil level of the oil storage part when the oil pump is stopped in at least a part between the oil storage part and the lubricating oil required part. Forming a reservoir,
Oil supply device. The oil passage has a one-way valve that shields the flow of lubricating oil from the oil pump toward the oil reservoir between the oil reservoir and the oil pump, and when the oil pump stops Forming the oil reservoir on the downstream side of the one-way valve;
The oil supply apparatus according to claim 1. The one-way valve is disposed at a connection position between the oil reservoir and the oil passage.
The oil supply apparatus according to claim 2. The oil passage has a bent portion that bends up and down at least at a part between the oil storage portion and the lubricating oil required portion, and the oil pool portion is formed in the bent portion when the oil pump is stopped. To
The oil supply apparatus according to claim 1.

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