JPH09236167A - Differential device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a differential device to prevent outflow of oil through a breather and perform sufficient lubrication regardless of the position of an engagement part between a pinion gear and a ring gear. SOLUTION: A shield plate 17 consisting of an annular press-in part 18 and a spiral part 19 having an orifice 20 is engaged with the outer peripheral part of the back of the tooth part 3a of a ring gear 3 engaged with a pinion gear 10 arranged inside a differential carrier 2. During rotation of the ring gear 3, the spiral part 19 of the shield plate 17 is filled with oil 13 stored in the oil reservoir 14 of the differential carrier 2 and during rotation, the oil 13 is fed to the ring gear 3 through the orifice 20 of the spiral part 19 to lubricate an engagement part 16 between the pinion hear 10 and the ring gear 3. Thus, the shield plate 17 prevents outflow of the oil 13 through a breather 15.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a differential device having improved lubricity at a meshing portion of a differential ring gear and a pinion gear connected to a transmission.

[0002]

2. Description of the Related Art A conventional differential will be briefly described with reference to FIG. Inside the differential carrier 2 of the differential 1, a ring gear 3 arranged in the rotational direction of a tire (not shown) is provided. Inside the ring gear 3, a rotary gear case 4 integrated with the ring gear 3 is provided.

Differential side gears 5 are provided on both left and right sides inside the rotary gear case 4, and a differential pinion gear 6 that meshes with the differential side gears 5 is provided.

At the center of the differential side gear 5, a drive shaft 7 having a tire mounted at one end is provided.
The other end of the is connected by spline fitting so that it can be rotated integrally. A pinion gear 10 provided on a pinion shaft 9 supported by two bearings 8 is meshed with the ring gear 3.

At the end of the pinion shaft 9 opposite to the pinion gear 10 side, a splined flange member 11 is provided. A universal joint on one side of a propeller shaft (not shown) is connected to the flange member 11, and a universal joint on the other side of the propeller shaft is connected to a rotation output shaft of the transmission 12.

Further, as shown in FIG. 6, an oil reservoir 14 filled with oil 13 is provided at the inner bottom of the differential carrier 2. A part of the ring gear 3 is immersed in the oil 13. Further, a breather 14 for ventilation is provided above the differential carrier 2. In FIG. 6, an arrow A indicates the rotation direction of the ring gear 3.

With this structure, the power from the transmission 12 is transmitted from the rotary output shaft to the propeller shaft, and from the propeller shaft to the pinion shaft 9 spline-fitted to the flange member 11. Further, power is transmitted from the pinion gear 10 of the pinion shaft 9 to the ring gear 3 that meshes with the pinion gear 10.

When the ring gear 3 rotates, the rotary gear case 4 fixed to the ring gear 3 rotates and is transmitted to the tire from the drive shaft 7 connected to the differential side gear 5. When the ring gear 3 rotates, as shown in FIG. 7, the ring gear 3 scrapes up the oil to lubricate the meshing portion 16 between the ring gear 3 and the pinion gear 10.

As a differential gear device, there is one disclosed in Japanese Utility Model Laid-Open No. 60-128056. What is disclosed in this publication is an oil pump that pumps oil from the oil reservoir of the differential carrier, a reserve tank that temporarily stores this oil, and a reservoir that communicates with this reserve tank and supplies oil to the meshing portion between the pinion gear and the ring gear. And a jet nozzle that does this.

Further, as a differential device, the actual device is Sho 63-69.
There is one disclosed in Japanese Patent Publication No. 850. What is disclosed in this publication is that the rotary gear case is provided with an oil scraping member that guides the oil in the differential carrier into the oil from an oil inlet provided in the rotary gear case.

[0011]

In the prior art described above, the oil is raked up by the ring gear in order to lubricate the meshing portion between the ring gear and the pinion gear. However, when the oil is scraped up, the oil is crushed by the centrifugal force. In some cases, the particles were scattered in the differential carrier and flowed out from the breather of the differential carrier 2.

Further, as shown in FIG. 6, the ring gear that meshes with the pinion gear rotates 180 degrees or more after it comes out of the oil sump and meshes with the pinion gear immediately before being immersed in oil. Depending on the meshing position of the pinion gear with the ring gear, there has been a problem that the oil lubrication at the meshing portion of the ring gear and the pinion gear is insufficient.

The differential gear device disclosed in Japanese Utility Model Laid-Open No. 60-128056 is provided with a jet nozzle for supplying oil to a pinion gear and a ring gear, an oil pump for pumping the oil, and a reserve tank for storing the oil. However, there is a risk that the device will become large-scale.

Further, the differential device disclosed in Japanese Utility Model Laid-Open No. 63-69850 is provided with an oil scraping member for squeezing the oil in the differential carrier into the rotary gear case. Since the oil scraping member is attached to the tooth portion of the ring gear, it is difficult to supply oil to the meshing portion between the ring gear and the pinion gear.

The present invention has been made in order to solve the above-mentioned conventional problems. A shield plate is attached to the outer periphery of the rear surface of the ring gear to prevent the oil from flowing out from the breather, and the pinion gear can be used anywhere. It is an object of the present invention to provide a differential device that is sufficiently lubricated even when meshed with.

[0016]

According to a first aspect of the present invention, a pinion gear linked to a rotary output shaft of a transmission is provided inside a differential carrier, and a ring gear that meshes with the pinion gear is rotatably provided.
A ring-shaped press-fitting portion is provided on the outer peripheral portion of the back surface of the tooth portion of the ring gear, and an orifice that is integrally provided on the outer peripheral edge of the press-fitting portion and curves toward the tooth portion of the ring gear and supplies oil to the meshing portion It is characterized in that a shield plate composed of an eddy winding portion provided above is attached.

According to the first aspect of the present invention, a ring-shaped press-fitting portion is provided on the outer peripheral portion of the back surface of the tooth portion of the rotatable ring gear that meshes with the pinion gear provided inside the differential carrier, and is integrally formed on the outer peripheral edge of the press-fitting portion. A shield plate consisting of a vortex winding portion provided with an orifice provided in is installed, and the vortex winding portion of the shielding plate is filled with the oil accumulated in the oil reservoir of the differential carrier when the ring gear rotates. The shield plate turns while filled with oil, and supplies oil to the ring gear from the orifice of the spiral winding portion to lubricate the meshing portion between the pinion gear and the ring gear.

The invention according to claim 2 is characterized in that the orifice provided on the circumference of the vortex winding portion corresponds to the tooth bottom portion of the ring gear.

According to the second aspect of the present invention, the orifice provided on the circumference of the spirally wound portion is made to correspond to the tooth bottom portion of the ring gear, so that the oil filled in the spirally wound portion is surely supplied to the tooth bottom portion to ensure the meshing portion. Lubricate.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention understood from the description of claim 1, a pinion gear 10 connected to a rotation output shaft of a transmission 12 is provided inside a differential carrier 2 as shown in FIG. Further, a ring gear 3 that meshes with the pinion gear 10 is rotatably provided. Then, a ring-shaped press-fitting portion 18 is formed on the outer peripheral surface of the back surface of the tooth portion 3a of the ring gear 3, and the tooth portion 3a of the ring gear 3 is curved toward the tooth portion 3a side to form a meshing portion.
A shield plate 17 composed of an eddy winding portion 19 provided on the circumference with an orifice 20 for supplying the oil 13 to 16 is fitted.

In the present invention understood from the second aspect, as shown in FIG. 2, the orifice 20 provided on the circumference of the spiral portion 19 is made to correspond to the tooth bottom portion 3b of the ring gear 3.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings, wherein the same members as those in FIGS. FIG. 1 is a schematic diagram of the differential 1. This differential 1 differential carrier 2
A ring gear 3 is rotatably provided inside the
A rotary gear case 4 is integrally provided at the center of the ring gear 3.

Inside the rotary gear case 4, there is provided a differential mechanism portion including a differential side gear 5 and a differential pinion gear 6 (see FIG. 5 for both). The ring gear 3 is meshed with a pinion gear 10 at the end of a pinion shaft 9 connected to the rotary output shaft of a transmission 12 (see FIG. 5).

Further, as shown in FIG. 1, a shield plate 17 is mounted by press fitting on the outer peripheral surface of the back surface of the tooth portion 3a of the ring gear 3 (see also FIG. 2). As shown in FIG. 3, the shielding plate 17 includes a press-fitting portion 18 and a spiral winding portion 19 that are press-fitted into the ring gear 3. The press-fitting portion 18 and the spiral winding portion 19 are formed in a ring shape along the ring gear 3.

The shield plate 17 in FIG. 3 is an enlarged view of only the lower portion of the shield plate 17 shown in FIG. This shield 17
The spiral portion 19 is curved toward the tooth portion 3a of the ring gear 3, and the curved portion faces the tooth bottom portion 3b so that the oil 13 hits the tooth bottom portion 3b of the tooth portion 3a of the ring gear 3. An orifice 20 is provided. The orifice 20 has a tooth bottom 3b
Are formed by the number of.

Since this embodiment is constructed as described above, as shown in FIGS. 1 and 2, when the ring gear 3 meshing with the pinion gear 10 is rotated by the rotation of the pinion shaft 9, the teeth of the ring gear 3 are rotated. Oil scraped up in part 3a
13 becomes the flow of the oil 13 as shown in FIG.
The oil is discharged from the orifice 20 through the inside and the oil is supplied to the tooth bottom portion 3a of the ring gear 3.

Therefore, the shielding plate 17 sufficiently supplies the oil 13 to the meshing portion 16 between the ring gear 3 and the pinion gear 10, and the oil lubrication can be reliably performed. In addition, since the oil 13 is retained in the spiral portion 19 of the shielding plate 17, it is possible to prevent a large amount of the oil 13 from scattering.

[0028]

According to the first aspect of the present invention, a ring-shaped press-fitting portion and a spiral-wound portion having an orifice are provided on the outer peripheral portion of the rear surface of the tooth portion of the ring gear that meshes with the pinion gear, which is provided inside the differential carrier. Since the shielding plate is attached, it is possible to fill the vortex winding portion of the shielding plate with the oil accumulated in the oil reservoir of the differential carrier when the ring gear rotates.

As a result, the shield plate rotates while being filled with oil, and the oil can be supplied to the ring gear through the orifice of the spiral portion to lubricate the meshing portion between the pinion gear and the ring gear. Therefore, the shielding plate can prevent the oil from flowing out from the breather.

According to the second aspect of the invention, since the orifice provided on the circumference of the spirally wound portion is made to correspond to the tooth bottom portion of the ring gear, the oil filled in the spirally wound portion is reliably supplied to the tooth bottom portion and meshed. The part can be reliably lubricated. This can significantly improve the lubricity of the meshing portion.

[Brief description of drawings]

FIG. 1 is a sectional view showing a main part of an embodiment of the present invention.

FIG. 2 is a right side view of the one in FIG.

FIG. 3 is an enlarged cross-sectional view of a lower portion of the shield plate of FIG.

FIG. 4 is a schematic diagram showing a flow of oil when the ring gear of FIG. 2 is rotated.

FIG. 5 is a cross-sectional view for explaining a conventional differential device.

6 is a cross-sectional view showing a meshing portion of a ring gear and a pinion gear shown in FIG.

FIG. 7 is a cross-sectional view showing a ring gear scooping up oil.

[Explanation of symbols]

 2 Differential carrier 3 Ring gear 3a Tooth 3b Tooth bottom 10 Pinion gear 12 Transmission 13 Oil 16 Meshing part 17 Shielding plate 18 Press-fitting part 19 Whirlpool part 20 Orifice

Claims (2)

[Claims] 1. A differential carrier is provided with a pinion gear linked to a rotary output shaft of a transmission, a ring gear meshing with the pinion gear is rotatably provided, and a ring-shaped press-fitting portion is provided on an outer peripheral portion of a rear surface of a tooth portion of the ring gear. And a shield plate consisting of an eddy winding portion integrally provided at the outer peripheral edge of the press-fitting portion, curved toward the tooth portion side of the ring gear, and provided with an orifice for supplying oil to the meshing portion on the circumference. The differential device characterized in that. 2. The differential device according to claim 1, wherein the orifice provided on the circumference of the spiral portion corresponds to the tooth bottom portion of the ring gear.