JPS6242151Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an oil pump lubricating device which is driven by spline connection to a drive shaft.

Generally, internal combustion engines such as automobiles are equipped with an oil pump on the drive shaft of the internal combustion engine, and lubricating oil is supplied to each part of the internal combustion engine by driving the pump.
The transmission mechanism is also hydraulically controlled.

As shown in FIG. 5, the oil pump is provided with a driving side pump element 2 and a driven side pump element 3 that rotate integrally with the rotation of the element 2 inside the main body casing 1. The pump element 2 is spline-coupled to the drive shaft 4 of the internal combustion engine, and the drive-side pump element 2 is attached to the drive shaft 4.
The rotation of the driven side pump element 3 is rotated, and the rotation of these elements 2 and 3 causes the casing 1 to rotate.
The oil in a pump chamber 5 formed inside is pressurized and is sent out from the pump chamber 5 to the outside.

By the way, the drive shaft 4 and the drive side pump element 2
It is necessary to supply lubricating oil to the spline joints to prevent wear, pitting, etc. of the spline joints.

Therefore, conventionally, a gap S for lubricating oil supply is formed between the casing 1 and the boss portion 2d of the drive side pump element 2, and the gap S is connected to the pump chamber 5.
This oil is leaked to supply oil to the spline joint.

However, in the oil supply means, most of the oil leaked from the gap S is scattered radially outward due to the centrifugal force accompanying the rotation of the drive-side pump element 2, and the spline joint is securely connected to the spline joint. It was impossible to lubricate it.

The present invention was devised in view of the above-mentioned problems, and it reliably supplies oil in the pump chamber to the spline joint between the drive-side pump element and the drive shaft, thereby preventing wear and pitting of the spline joint. The object of the present invention is to provide an oil pump lubrication device that can prevent the above problems.

Therefore, the present invention provides an oil pump comprising a driving pump element and a driven pump element interlocking with the driving pump element, the driving pump element being spline-coupled to a drive shaft, the oil pump comprising: a driving pump element; A lubrication oil supply passage that opens at the spline joint to the drive shaft is provided, and the passage communicates with the pump chamber, and the spline joint is connected to the spline joint.
A circumferential communication groove communicating between spline grooves of at least one of the drive shaft and the drive-side pump element is provided around the circumference, and a groove bottom of the communication groove is engaged with the spline groove in which the communication groove is formed. It is characterized by being deeper than the tips of the spline teeth.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The oil pump lubrication device according to the present invention will be explained below with reference to the drawings.

The drawing shows a trochoidal oil pump, in which a small-diameter drive gear 2 with a large number of teeth 2a on the outer periphery is installed as a drive-side pump element inside a main body casing 1.
and a large-diameter driven gear 3 having teeth 3a that mesh with the teeth 2a of the drive gear 2 on the inner periphery as a driven pump element, and the drive gear 2 is located at an eccentric position with respect to the driven gear 3, This drive gear 2 is integrally connected to a drive shaft 4 of an internal combustion engine, and the driven gear 3 is rotated by the rotation of the drive gear 2 accompanying the drive shaft 4, and the relative eccentricity of these two gears 2 and 3 is The rotation pressurizes the oil in the pump chamber 5 formed between the gears 2 and 3 within the casing 1, and sends it out from the pump chamber 5.

The drive gear 2 and the drive shaft 4 are connected to rotate together by spline connection, that is, a plurality of spline teeth 2b and spline grooves 2c are formed on the inner peripheral surface of the shaft hole of the drive gear 2, and A cylindrical body 4a is press-fitted onto the drive shaft 4, and the drive gear 2 is attached to the outer peripheral surface of the cylindrical body 4a.
spline teeth 4b and spline grooves 4c that mesh with spline teeth 2b and spline grooves 2c are formed to connect the drive gear 2 to the cylindrical body 4a of the drive shaft 4.
They are fitted on top and splined together.

In the embodiment shown in the figure, in the oil pump having the above structure, the drive gear 2 is provided with a lubricating oil supply passage 6 that opens at the spline joint with the drive shaft 4, and the passage 6 is connected to the pump. In communication with the chamber 5 and in the spline joint,
A circumferential communication groove 7 that communicates between the spline grooves 4c on the drive shaft 4 side is provided, and the communication groove 7
The bottom of the groove is made deeper than the tip of the spline tooth 2b that meshes with the spline groove 4c in which the communication groove 7 is formed.

Specifically, the teeth 2 in the drive gear 2
Between the tooth bottom between a and the inner spline groove 2c,
The oil supply passage 6 extending in the radial direction is formed, and the spline groove 2 of the drive gear 2 is formed by the passage 6.
c and the pump chamber 5, and a circumferential communication groove 7 is formed in a part of the spline teeth 4b on the drive shaft 4 side, and the communication groove 7 connects each spline groove between the spline teeth 4b. 4c, the oil in the pump chamber 5 is supplied to the inner peripheral spline groove 2c of the drive gear 2 through the passage 6, and the communication groove 7 is supplied from the spline groove 2c to the inner peripheral spline groove 2c.
It was designed to supply oil to the spline groove 4c on the drive shaft 4 side through the spline groove 4c.

In the embodiment shown in FIG. 2, the oil supply passage 6 is formed in a portion of the drive gear 2 facing the pump chamber 5, and the communication groove 7 is formed in a position opposite to the passage 6, so that the pump chamber 5 is applied directly to the passage 6 and the communication groove 7 to supply oil in the pump chamber 5 to the spline joint.

In the oil supply means shown in FIG. 2, the oil supply pressure may be too high. In this case, the oil supply passage 6 is formed in the boss portion 2d of the drive gear 2, as shown in FIG. In addition, the communication groove 7 on the drive shaft 4 side is formed to face the oil supply passage 6 of the boss portion 2d, and thus As a result, the internal pressure of the pump chamber 5 is indirectly applied to the passage 6 and the communication groove 7, and the oil in the pump chamber 5 is supplied to the spline portion at low pressure.

Further, if the oil supply pressure is too high in the oil supply means shown in FIG. 2 and too low in the oil supply means shown in FIG.
is formed at a position facing the pump chamber 5, and the communication groove 7 is formed at a position apart from the passage 6 laterally and non-opposing, so that the passage 6 is connected to the spline groove 2c of the drive gear 2 and the drive shaft 4 side. This is done to supply oil to the communication groove 7 through the gap between the spline tooth 4b and the spline tooth 4b.

One or more of the oil supply passage 6 and the communication groove 7 may be formed, and the communication groove 7 may include the following:
As described above, the spline groove 4c is formed deeper than the tip of the spline tooth of the drive gear 2 that meshes with the spline groove 4c on the drive shaft 4 side.

In the illustrated embodiment, the communication groove 7 is formed on the spline tooth 4b on the drive shaft 4 side, but the communication groove 7 may be formed on the spline tooth 2b on the drive gear 2 side, or alternatively, the communication groove 7 may be formed on the spline tooth 2b on the drive shaft 4 side. spline tooth 2
b and the spline teeth 2b on the drive gear 2 side. When forming the spline teeth 2b on the drive gear 2 side, the groove bottom of the communication groove 7 may be formed on both the spline teeth 2b on the drive gear 2 side. gear 2
The spline teeth are formed deeper than the tips of the spline teeth on the drive shaft 4 side that mesh with the spline grooves 2c on the side.

Furthermore, in the illustrated embodiment, a trochoid type oil pump has been described, but the present invention can also be applied to gear pumps and other types of oil pumps.

8 in the figure is a side plate of the casing 1.

The oil pump lubrication device of the present invention is constructed as described above, and as the drive shaft 4 is driven, the drive gear 2 and the driven gear 3 are rotated within the casing 1, and the oil within the pump chamber 5 is pressurized. and is sent out from the pump chamber 5.

When the oil pump is in operation, a portion of the oil in the pump chamber 5 flows from the oil supply passage 6 formed in the drive gear 2 through the communication groove 7 to the spline joint between the gear 2 and the drive shaft 4. supplied,
The spline joint is lubricated.

As explained above, in the oil pump lubrication device of the present invention, the drive-side pump element spline-coupled to the drive shaft is provided with an oil supply passage that opens at the spline joint to the drive shaft, and the passage is communicated with the pump chamber. Additionally, a circumferential communication groove is provided in the spline joint portion to communicate between at least one of the spline grooves of the drive shaft and the drive-side pump element, and the bottom of the communication groove is connected to the communication groove. Since the spline groove is deeper than the tips of the spline teeth that mesh with the spline groove, a portion of the oil in the pump chamber can be reliably supplied to the spline joint through the passage and the communication groove, and the spline joint can be reliably supplied with oil. Therefore, wear and pitting of the spline joint can be reliably prevented.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway front view of a lubricating device for an oil pump according to the present invention, Fig. 2 is a vertical cross-sectional side view of the same, and Figs. 3 and 4 are longitudinal cross-sections of a part of the pump showing other embodiments. Side view, FIG. 5 is a longitudinal sectional side view showing a conventional example. 2... Drive side pump element (drive gear), 4
... Drive shaft, 5 ... Pump chamber, 6 ... Oil supply passage,
7...Communication groove.

Claims (1)

[Scope of utility model registration request] An oil pump comprising a drive side pump element and a driven side pump element interlocked with the drive side pump element, the drive side pump element being spline-coupled to a drive shaft, wherein the drive side pump element is connected to the drive shaft. A lubrication oil supply passage is provided that opens at the spline joint of the pump, and the passage communicates with the pump chamber, and the spline groove of at least one of the drive shaft and the drive-side pump element communicates with the spline joint. lubrication of an oil pump, characterized in that a circumferential communication groove is provided around the circumference, and the groove bottom of the communication groove is deeper than the tip of a spline tooth meshing with the spline groove in which the communication groove is formed. Device.