JP4127101B2 - Oil pumping device with balancer function - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an oil pressure feeding device using a balance weight.
[0002]
[Prior art]
Japanese Patent Laid-Open No. 4-224339 discloses an oil pressure feeding device having a balancer function, in which a gear pump for pumping engine oil is added with a function as a balancer for canceling vibrations generated in the engine. . That is, in such a device, a pair of gears are disposed in the housing, and these gears are rotated by the driving force transmitted from the crankshaft, so that oil is supplied to a gap generated between the inner surface of the housing and the tooth bottom of the gear. I was pumping up while storing. Each gear is composed of two regions having different specific gravities, and functions as an unbalanced mass because the center of rotation of the gear is shifted from the center of gravity (see Patent Document 1).
[0003]
[Patent Document 1]
JP-A-4-224339
[Problems to be solved by the invention]
However, the above-described conventional apparatus has a problem in that the amount of pumped oil is small because the oil is pumped using a small gap generated between the inner surface of the housing and the tooth bottom.
The present invention has been made in view of such a problem, and an object thereof is to provide an oil pumping device having a balancer function capable of pumping oil efficiently and in large quantities.
[0005]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, an oil pressure feeding device having a balancer function according to the present invention includes a balance weight means having at least a pair of diameter portions opened at a predetermined center angle, and a storage chamber for rotatably storing the balance weight means. And a housing having a storage chamber for storing oil in a space formed between the defining portion of the storage chamber and the diameter portion of the balance weight means, and the storage through the inlet and the outlet, respectively. An oil inflow path and an oil outflow path communicating with the chamber , wherein the balance weight means includes an arc portion connecting outer ends of the pair of diameter portions, and the storage chamber includes a defining portion of the storage chamber, A roller in contact with the arc portion is rotatably provided so as to close a gap with the arc portion.
The balance weight means may have a semicircular longitudinal cross section. In this case, the oil can efficiently function as an unbalance weight while securing a sufficient space for storing oil and acquiring a large amount of oil delivery.
Further, it is preferable that the extension direction of the oil outflow path is inclined forward in the rotational direction of the balance weight means with respect to a radial reference line including the rotation center of the balance weight means and the outlet. . In this case, the oil efficiently flows into the oil outflow path .
Further, it is preferable that the roller is disposed adjacent to the outlet in front of the outlet in the rotational direction of the balance weight means. In this case, it is possible to prevent leakage at a portion where the oil delivery effect is greatly reduced by oil leakage.
Further, an oil supply path is provided upstream of the oil inflow path, and it is preferable that the oil supply path communicates with the bearing portion so as to supply oil to the bearing portion of the balance weight means. . In this case, the oil supply path can function not only as a flow path for supplying pressure feeding oil to the storage chamber but also as a flow path for supplying lubricating oil to the bearing portion of the balance weight means. .
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the accompanying drawings.
Embodiment 1 FIG.
FIG. 1 shows a longitudinal section of an oil pressure feeding device having a balancer function according to an embodiment of the present invention. FIG. 2 shows a cross section taken along line II-II in FIG. The housing 3 of the oil pressure feeding device 1 is formed by joining a housing upper 3a constituting the upper part and a housing lower 3b constituting the lower part at a predetermined mating surface. In the housing 3, a pair of left and right accommodation chambers 7a and 7b for rotatably accommodating a pair of left and right balance weights 5a and 5b, which are balance weight means, are formed.
[0008]
An oil supply path 9 is provided at a position slightly above the middle of the pair of housing chambers 7a and 7b in the housing upper 3a. The oil supply path 9 extends substantially parallel to the rotation axis of the pair of balance weights 5a and 5b. A pair of oil inflow passages 11a and 11b extends from the oil supply passage 9 toward the pair of storage chambers 7a and 7b. The oil inflow passages 11a and 11b communicate with the corresponding storage chambers 7a and 7b through the inflow ports 13a and 13b. Further, a pair of oil transfer paths 15a and 15b are provided at positions on the lower side of the housing chambers 7a and 7b in the housing lower 3b. Such oil conveyance paths 15a and 15b also extend substantially parallel to the rotation axis of the balance weights 5a and 5b. A pair of oil outflow paths 17a and 17b extend from the oil transfer paths 15a and 15b toward the storage chambers 7a and 7b. The oil outflow passages 17a and 17b communicate with the corresponding storage chambers 7a and 7b through the outlets 19a and 19b. In the present embodiment, the extension direction EX of the oil outflow passages 17a and 17b is a radial reference line BL that passes through the rotation center (rotation axis) O of the balance weights 5a and 5b and the approximate centers of the outflow ports 19a and 19b. On the other hand, it is inclined forward with respect to the rotation direction of the balance weight indicated by the arrow R.
[0009]
As shown in FIG. 3, the balance weights 5 a and 5 b are formed in a semicircular shape (three-dimensionally semi-cylindrical shape) in a vertical direction in a direction orthogonal to the rotation axis. A pair of diameter portions 21a and 21b defining an open weight shape at an angle of 180 degrees and an arc portion 25 connecting the pair of outer end portions 23 of the diameter portions 21a and 21b are provided. In the present embodiment, the diameter portions 21a and 21b extend linearly as viewed in the longitudinal section. As described above, the semi-circular shape of the vertical cross section effectively functions as an unbalanced weight while sufficiently securing a space for storing oil, which will be described later, to obtain a large amount of oil delivery.
[0010]
Further, as shown in FIG. 2, support shaft portions 31 and 33 protrude from front and rear end surfaces of the weight portions of the balance weights 5a and 5b. Accordingly, the balance weights 5a and 5b are rotatably supported by the support shaft portions 31 and 33 by four bearing portions 35 that are provided in the housing 3 and that are not illustrated in detail. Further, from the oil supply path 9 (see FIG. 1) upstream of the oil inflow paths 11a and 11b, a flow path (not shown) that communicates with each bearing portion 35 extends, and the oil supply path 9 includes a pair of storage chambers. In addition to supplying pressure feeding oil to 7a and 7b, it functions as a flow path for supplying lubricating oil to each bearing portion 35. A pair of weight driving gears 37 are attached to the rear ends of the pair of support shaft portions 33. Further, a power transmission rod 39 is attached to the weight driving gear 37 on the left side of the balance weight 5a in the drawing. The front end of is connected. A power input gear 41 is connected to the rear end of the power transmission rod 39. The power input gear 41 is supplied with rotational torque of a crankshaft (not shown) in the engine.
[0011]
Next, the operation of the oil pressure feeder having the balancer function according to the present embodiment having such a configuration will be described. When the rotational torque of the engine crankshaft is input to the power input gear 41, the torque is transmitted to the pair of balance weights 5a and 5b via the power transmission rod 39, the pair of weight driving gears 37, and the support shaft portion 33. Accordingly, the balance weights 5a and 5b rotate as indicated by an arrow R in FIG. As shown in FIG. 1, a space 43 having a semicircular longitudinal section is secured by the inner peripheral surface 7c as a defining portion of the storage chambers 7a and 7b and the pair of diameter portions 21a and 21b. The space 43 is located above the corresponding storage chambers 7a and 7b in the state where the pair of balance weights 5a and 5b is positioned below the pair of storage chambers 7a and 7b. The oil in the oil supply path 9 flows into the pair of spaces 43 through the inflow paths 11a and 11b.
[0012]
As the pair of balance weights 5a and 5b rotate, the angular position of the space 43 in the storage chambers 7a and 7b also changes. For this reason, the oil stored in the space 43 also moves as the position of the space 43 changes. Then, as shown in FIG. 4, when the pair of balance weights 5a and 5b move upward and communication between the space 43 and the oil outflow passages 17a and 17b is secured, the balance weights 5a and 5b Due to the feed action accompanying rotation and the centrifugal force at the time of oil movement, the oil stored in the space 43, as indicated by the arrow B, passes through a pair of oil outflow paths 17a, 17b, a pair of oil transport paths 15a, It is pumped to 15b. Thereafter, with the rotation of the balance weights 5a and 5b, the oil is supplied into the space 43 in a state where the communication between the space 43 and the oil inflow passages 11a and 11b is secured, and the space 43 and the oil outflow passages 17a and 17b The oil in the space 43 is pumped to the oil transport paths 15a and 15b in a state where the communication is ensured. Further, since the center of gravity and the rotation center of the semicircular balance weights 5a and 5b are deviated from each other, the balance weights 5a and 5b can provide a balancer function for canceling vibration generated in the engine as well as pumping oil.
[0013]
In this way, the balance weight having a pair of diameter portions opened at a predetermined center angle is used, and the oil is transferred using the entire unoccupied space in which no balance weight is present in the accommodation chamber. As compared with the conventional mode in which a solid member occupies, a large amount of oil can be pumped efficiently. Further, since the oil outflow path is formed to be inclined as described above corresponding to the rotation direction, the oil in the accommodation chamber can be efficiently discharged to the outside. Further, since the balancer device also functions as an oil pressure feeding device, the existing oil pump in the engine can be downsized or deleted. Further, in general, when a balancer device is provided, there is a concern that the hydraulic pressure is reduced (compared to an engine without a balancer device) due to the supply of lubricating oil to the weight bearings. Since the oil pressure feeding function is added to the device itself, there is no problem of a decrease in oil pressure. In addition, the balancer device that already has a lubrication oil supply system to the weight bearing can be implemented by adding at least an oil inflow path, an oil outflow path, and an oil transfer path, and there is an advantage that the number of remodeling points can be reduced. There is.
[0014]
Embodiment 2. FIG.
Next, an oil pressure feeder having a balancer function according to Embodiment 2 of the present invention will be described with reference to FIG. In the present embodiment, a pair of rollers described later is added to the first embodiment. That is, a pair of rollers 145 are rotatably embedded in the inner peripheral surfaces 7c of the storage chambers 7a and 7b in the housing lower 3b. The roller 145 is disposed so as to contact the arc portion 25 of the balance weights 5a and 5b. As a result, the arc-shaped gap between the inner circumferential surface 7c of the storage chamber and the arc portions 25 of the balance weights 5a and 5b, which was about several millimeters in the first embodiment, is blocked, and the arc-shaped gap in the space 43 is formed from the arc-shaped gap. The phenomenon of oil leakage can be completely prevented. The pair of rollers 145 are disposed adjacent to the outlets 19a and 19b on the front side in the rotational direction of the balance weights 5a and 5b with respect to the corresponding outlets 19a and 19b. Accordingly, when oil leakage from the space 43 to the arcuate gap occurs, oil leakage can be prevented at a portion where the oil pumping efficiency is most reduced.
[0015]
The present invention is not limited to the above-described embodiment, and can be implemented with various modifications. For example, as the balance weight, as shown in FIG. 6A, a balance weight 205 having a fan-shaped longitudinal section may be used. In this balance weight 205, the central angle θ that determines the degree of opening of the pair of left and right diameter portions 221a and 221b is set to be less than 180 degrees. The present invention does not exclude an aspect exceeding the center angle of 180 degrees, but if the angle exceeds 180 degrees, the effect as an unbalanced weight is offset and reduced, so the center angle is preferably 180 degrees or less. It is. Furthermore, as shown in FIG. 6B, a balance weight 305 in which a pair of left and right diameter portions 321a and 321b are curved may be used. That is, the balance weight of the present invention is not limited to the pair of left and right diameter portions being linear, and can be selected in a suitable form in consideration of the oil pumping effect.
[0016]
In the present invention, the number and positions of the oil conveyance path, the oil outflow path, the outflow port, the inflow port, the oil inflow path, the oil supply path and the rollers, and the extending direction of the oil outflow path are also described in the above-described embodiments. The present invention is not limited to this, and can be implemented with appropriate modifications.
[0017]
【The invention's effect】
As described above, according to the present invention, a large amount of oil can be efficiently pumped by an oil pumping device having a balancer function.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing an oil receiving state in an oil pressure feeding device according to Embodiment 1 of the present invention.
2 is a cross-sectional view taken along the line II-II in FIG.
FIG. 3 is a diagram showing the shape of a balance weight used in the oil pressure feeding device according to the first embodiment.
FIG. 4 is a longitudinal sectional view of the same mode as FIG. 1, showing an oil delivery state.
FIG. 5 is a longitudinal sectional view of the same mode as in FIG. 1, relating to an oil pressure feeding device according to a second embodiment of the present invention.
FIG. 6 is a diagram showing the shape of a balance weight used in an oil pressure feeding device according to another embodiment.
[Explanation of symbols]
1,101 Oil pressure feeding device having balancer function, 3 housing, 5a, 5b, 205, 305 balance weight (balance weight means), 7a, 7b accommodating chamber, 7c inner circumferential surface (defining part) of accommodating chamber, 9 oil supply Road, 11a, 11b Oil inflow path, 13a, 13b Inlet, 17a, 17b Oil outflow path, 19a, 19b Outlet, 21a, 21b, 221a, 221b, 321a, 321b Diameter, 23 Outer end, 25 Arc , 35 Bearing part, 43 space, 145 roller, BL radial direction reference line.

Claims (5)

Balance weight means having at least a pair of diameter portions that open at a predetermined center angle;
A housing that rotatably accommodates the balance weight means, and that contains oil in a space formed between a defining portion of the accommodation chamber and a diameter portion of the balance weight means; ,
An oil inflow path and an oil outflow path communicating with the accommodation chamber via an inlet and an outlet, respectively .
The balance weight means includes an arc portion connecting outer end portions of the pair of diameter portions,
An oil pressure feeding device having a balancer function , wherein a roller that contacts the arc portion is rotatably provided in the accommodating chamber so as to close a gap between the defining portion of the accommodating chamber and the arc portion. .   2. The oil pressure feeding device having a balancer function according to claim 1, wherein the balance weight means has a semicircular longitudinal section.   The extending direction of the oil outflow passage is inclined forward in the rotational direction of the balance weight means with respect to a radial reference line including a rotation center of the balance weight means and the outlet. Item 3. An oil pressure feeding device having a balancer function according to Item 1 or 2. The balancer according to any one of claims 1 to 3, wherein the roller is disposed adjacent to the outlet in front of the outlet in the rotational direction of the balance weight means. Oil pumping device with function. An oil supply passage is provided upstream of the oil inflow passage, and the oil supply passage communicates with the bearing portion so as to supply oil to the bearing portion of the balance weight means. Item 5. An oil pressure feeding device having a balancer function according to any one of Items 1 to 4 .

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