JP2004301272A - Oil force feed device having balancer function - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an oil force feed device having the balancer function for efficiently and forcibly feeding oil in large quantities. <P>SOLUTION: This oil force feed device 1 has a pair of balance weights 5a and 5b having a vertical cross section of a semicircular shape. These weights are rotatably housed in housing chambers 7a and 7b of a housing 3. The oil from oil inflow passages 11a and 11b flows in a semicircular space 43 formed between an inner peripheral surface 7c of the housing chambers and the weights according to rotation of the weights, and is also forcibly fed outside the device 1 via oil outflow passages 17a and 17b. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an oil pressure feeding device using a balance weight.
[0002]
[Prior art]
Japanese Patent Laying-Open No. 4-224339 discloses an oil pumping 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 arranged in a housing, and these gears are rotated by a driving force transmitted from a crankshaft, so that oil is filled in a gap generated between an inner surface of the housing and a gear bottom. I was pumping it up. Further, each gear is composed of two region portions having different specific gravities, and has also functioned as an unbalance mass because the rotation center of the gear and the center of gravity are shifted (see Patent Document 1).
[0003]
[Patent Document 1]
JP-A-4-224339
[Problems to be solved by the invention]
However, in the above-described conventional apparatus, since the oil is pumped using the small gap generated between the inner surface of the housing and the tooth bottom, there is a problem that the amount of oil pumped is small.
The present invention has been made in view of such a problem, and an object of the present invention is to provide an oil pumping device having a balancer function that can efficiently pump a large amount of oil.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, an oil pumping device having a balancer function according to the present invention includes a balance weight unit having at least a pair of radial portions that open at a predetermined center angle, and a storage chamber that rotatably stores the balance weight unit. A housing having an accommodation chamber for accommodating oil in a space formed between a defining portion of the accommodation chamber and a diameter portion of the balance weight means, and the housing is provided through an inlet and an outlet, respectively. An oil inflow passage and an oil outflow passage communicating with the chamber are provided.
[0006]
Further, the balance weight means may have a longitudinal section having a semicircular shape. In this case, a sufficient space for storing oil is obtained, and a large amount of oil is delivered, while efficiently functioning as an unbalance weight.
Further, it is preferable that an extension direction of the oil outflow path is inclined forward in a rotation direction of the balance weight means with respect to a radial reference line including a rotation center of the balance weight means and the outflow port. . In this case, the oil efficiently flows into the oil outflow passage.
The balance weight means includes an arc portion connecting the outer ends of the pair of diameter portions, and the accommodation chamber is in contact with the arc portion so as to close a gap between the defining portion of the accommodation room and the arc portion. Preferably, the rotating roller is provided rotatably. In this case, it is possible to prevent oil leakage from occurring from the gap.
Further, it is preferable that the roller is disposed on the rotation direction front side of the balance weight means with respect to the outlet, adjacent to the outlet. In this case, it is possible to prevent leakage in a portion where the oil delivery effect is largely reduced due to oil leakage.
It is preferable that an oil supply path is provided upstream of the oil inflow path, and the oil supply path communicates with the bearing of the balance weight means so as to supply oil to the bearing. . In this case, the oil supply path can function not only as a flow path for supplying oil for pressure feeding to the storage chamber, but also as a flow path for supplying oil for lubrication to the bearing portion of the balance weight means. .
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
Embodiment 1 FIG.
FIG. 1 shows a longitudinal section of an oil pumping device having a balancer function according to an embodiment of the present invention. FIG. 2 shows a cross section along the line II-II in FIG. The housing 3 of the oil pressure feeding device 1 is formed by joining a housing upper 3a constituting an upper portion thereof and a housing lower 3b constituting a lower portion thereof at a predetermined mating surface. In the housing 3, a pair of left and right storage chambers 7a and 7b for rotatably storing a pair of left and right balance weights 5a and 5b as balance weight means are formed.
[0008]
An oil supply passage 9 is provided at a position slightly above the middle of the pair of storage chambers 7a and 7b in the housing upper 3a. The oil supply passage 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 extend from the oil supply passage 9 toward the pair of storage chambers 7a and 7b. The oil inflow paths 11a and 11b communicate with the corresponding storage chambers 7a and 7b via the inflow ports 13a and 13b. A pair of oil transfer paths 15a, 15b is provided in the housing lower 3b at a position on the outer lower side of each of the storage chambers 7a, 7b. The oil conveying paths 15a and 15b also extend substantially parallel to the rotation axis of the balance weights 5a and 5b. A pair of oil outflow passages 17a and 17b extend from the oil conveyance passages 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, 17b is defined by a radial reference line BL passing through the rotation center (rotation axis) O of the balance weights 5a, 5b and substantially the center of the outlets 19a, 19b. On the other hand, the balance weight is inclined forward in the rotation direction of the balance weight indicated by arrow R.
[0009]
As shown in FIG. 3, the balance weights 5a and 5b have a semicircular shape (three-dimensionally a semi-cylindrical shape) in a vertical section orthogonal to the rotation axis. It has a pair of radial 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 ends 23 of the radial portions 21a and 21b. In the present embodiment, the diameter portions 21a and 21b extend linearly when viewed in the vertical section. With such a form in which the longitudinal section is a semicircular shape, a space for storing the oil described later is sufficiently secured to obtain a large amount of oil delivery, and also functions efficiently as an unbalance weight.
[0010]
As shown in FIG. 2, the support shaft portions 31, 33 protrude from the front and rear end surfaces of the weight portions of the balance weights 5a, 5b. Therefore, the balance weights 5a and 5b are rotatably supported on the support shaft portions 31 and 33 by four bearing portions 35 (not shown) provided in the housing 3 in detail. Further, a flow path (not shown) communicating with each bearing portion 35 extends from the oil supply path 9 (see FIG. 1) upstream of the oil inflow paths 11a and 11b, and the oil supply path 9 includes a pair of storage chambers. In addition to supplying oil for pressure feeding to 7a and 7b, it also functions as a flow path for supplying oil for lubrication to each bearing portion 35. A pair of weight driving gears 37 are attached to the rear ends of the pair of support shafts 33, and a power transmission rod 39 is attached to the weight driving gear 37 on the balance weight 5a side on the left side in the drawing. Is connected at the front end. A power input gear 41 is connected to the rear end of the power transmission rod 39. The power input gear 41 is adapted to receive the torque of a crankshaft (not shown) of the engine.
[0011]
Next, the operation of the oil pumping device having the above configuration and having a balancer function according to the present embodiment will be described. When the rotational torque of the crankshaft of the engine is input to the power input gear 41, the torque is transmitted via the power transmission rod 39, the pair of weight driving gears 37, and the support shaft 33 to the pair of balance weights 5a, 5b. , Whereby the balance weights 5a and 5b rotate as shown by the arrow R in FIG. As shown in FIG. 1, a space 43 having a semicircular vertical section is secured by the inner peripheral surface 7c as a defining portion of the storage chambers 7a and 7b and the pair of radial portions 21a and 21b. When the pair of balance weights 5a and 5b are located below the pair of accommodation rooms 7a and 7b, the space 43 is located above the corresponding accommodation rooms 7a and 7b and is indicated by an arrow A. As described above, the oil in the oil supply passage 9 flows into the pair of spaces 43 via the inflow passages 11a and 11b.
[0012]
With the rotation of the pair of balance weights 5a, 5b, the angular position of the space 43 in the storage chambers 7a, 7b also changes. Therefore, the oil stored in the space 43 also moves with the change in the position of the space 43. Then, as shown in FIG. 4, when the pair of balance weights 5a and 5b move upward and the state where the communication between the space 43 and the oil outflow passages 17a and 17b is ensured, the balance weights 5a and 5b are removed. Due to the feed action accompanying the rotation and the centrifugal force at the time of oil movement, the oil stored in the space 43 passes through a pair of oil outflow paths 17a and 17b as shown by an arrow B, and a pair of oil conveyance paths 15a and 17b. 15b. Thereafter, with the rotation of the balance weights 5a, 5b, oil is supplied into the space 43 in a state where communication between the space 43 and the oil inflow passages 11a, 11b is secured, and the space 43 and the oil outflow passages 17a, 17b are connected to each other. The oil in the space 43 is pressure-fed to the oil conveying paths 15a and 15b in a state where the communication is established. In addition, since the center of rotation and the center of rotation of the semicircular balance weights 5a and 5b are displaced from each other, the rotation of the balance weights 5a and 5b provides not only oil pressure feed but also a balancer function for canceling vibration generated in the engine.
[0013]
As described above, the balance weight having a pair of radial portions that open at a predetermined center angle is used, and oil is transferred using the entire non-occupied space where the balance weight does not exist in the accommodation room. It is possible to efficiently pump a large amount of oil as compared with a conventional mode in which a solid member is occupied. Further, since the oil outflow passage is formed so as to correspond to the rotation direction and to be inclined as described above, the oil in the storage chamber can be efficiently discharged outside the room. Further, since the balancer device also functions as an oil pumping device, the existing oil pump in the engine can be reduced in size or eliminated. Further, in general, when the balancer device is provided, there is a concern that the hydraulic pressure may drop (compared to an engine without the balancer device) with the supply of the lubricating oil to the weight bearing. However, according to the present invention, the balancer Since the oil pumping function is added to the device itself, there is no problem of a decrease in oil pressure. In addition, for a balancer device that already has a lubricating oil supply system to the weight bearing, it can be implemented simply by adding at least an oil inflow path, an oil outflow path, and an oil conveyance path, and has the advantage of requiring fewer remodeling points. There is.
[0014]
Embodiment 2 FIG.
Next, an oil pressure feeding device having a balancer function according to a second embodiment 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 surface 7c of the housing chambers 7a, 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 peripheral surface 7c of the accommodation chamber and the arc portion 25 of the balance weights 5a and 5b, which was about several millimeters in the first embodiment, is closed. The phenomenon of oil leakage can be completely prevented. In addition, the pair of rollers 145 is disposed adjacent to the outlets 19a, 19b on the rotation direction front side of the balance weights 5a, 5b than the corresponding outlets 19a, 19b. Therefore, when oil leakage from the space 43 to the arc-shaped gap occurs, oil leakage can be prevented in a portion where the oil pumping efficiency is most reduced.
[0015]
The present invention is not limited to the above embodiment, and can be implemented with various modifications. For example, as shown in FIG. 6A, a balance weight 205 having a fan-shaped vertical section can be used as the balance weight. In the balance weight 205, the center angle θ that determines the degree of opening of the pair of left and right diameter portions 221a and 221b is set to less than 180 degrees. The present invention does not exclude a mode in which the center angle exceeds 180 degrees. However, if the angle exceeds 180 degrees, the effect as an unbalance weight is canceled or reduced. Therefore, the center angle is preferably 180 degrees or less. It is. Further, as shown in FIG. 6B, a balance weight 305 in which a pair of left and right radial 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 right and left radial portions being linear, and can be selected in a suitable form in consideration of the oil pumping effect.
[0016]
The present invention is also applicable to the above-described embodiment in which the number and positions of the oil conveying 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 above. However, the present invention is not limited to this, and can be implemented with appropriate modification.
[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 pumping device according to Embodiment 1 of the present invention.
FIG. 2 is a sectional view taken along the line II-II in FIG.
FIG. 3 is a diagram showing a 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 embodiment as FIG. 1, showing an oil delivery state.
FIG. 5 is a longitudinal sectional view of the same embodiment as FIG. 1 relating to an oil pumping device according to a second embodiment of the present invention.
FIG. 6 is a diagram showing a shape of a balance weight used in an oil pressure feeding device according to still 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 storage chamber, 7c inner peripheral surface of storage chamber (defining section), 9 oil supply Channel, 11a, 11b oil inflow channel, 13a, 13b inflow port, 17a, 17b oil outflow channel, 19a, 19b outflow port, 21a, 21b, 221a, 221b, 321a, 321b diameter section, 23 outer end section, 25 arc section , 35 bearing part, 43 space, 145 rollers, BL radial reference line.

Claims (6)

Balance weight means having at least a pair of radial portions that open at a predetermined center angle,
A housing that rotatably stores the balance weight means, and a storage chamber that stores oil in a space formed between a defining portion of the storage chamber and a diameter portion of the balance weight means; ,
An oil pumping device having a balancer function, comprising: an oil inflow passage and an oil outflow passage communicating with the storage chamber via an inlet and an outlet, respectively. The oil pumping device according to claim 1, wherein the balance weight means has a semicircular vertical cross section. The extension direction of the oil outflow passage is inclined forward in the rotation direction of the balance weight means with respect to a radial reference line including the rotation center of the balance weight means and the outflow port. Item 3. An oil pressure feeding device having a balancer function according to item 1 or 2. The balance weight means includes an arc portion connecting outer end portions of the pair of diameter portions,
4. The storage chamber according to claim 1, wherein a roller that contacts the arc portion is rotatably provided in the storage chamber so as to close a gap between the defining portion of the storage chamber and the arc portion. An oil pressure feeding device having a balancer function according to any one of the preceding claims. 5. The oil pumping device having a balancer function according to claim 4, wherein the roller is disposed forward of the outflow port in the rotation direction of the balance weight means and adjacent to the outflow port. 6. An oil supply path is provided upstream of the oil inflow path, and the oil supply path communicates with the bearing of the balance weight means so as to supply oil to the bearing. Item 6. An oil pressure feeding device having a balancer function according to any one of Items 1 to 5.

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