JPH04185535A - Lubrication device for pneumatic seal structure - Google Patents

Abstract

PURPOSE:To extend the replacement cycle of an X ring against wear by receiving oil scattered inside a drive gear box in an oil reservoir, then introducing it to a part between a rotation surface and the X ring, and thereby enabling lubrication from the inside of X ring automatically at all times. CONSTITUTION:A lubrication device is provided with an X ring 9 which slides on a rotating face rotating with an axle 3 and provided between a pneumatic passage 8 rotating with the axle 3 while being connected to a pneumatic clutch 6 of a differential controller and a pneumatic pipe passage 1 fixed to a vehicle body while connected to a pneumatic control valve. In this case, an oil sump 11 is provided for receiving oil scattered inside a drive gear box 17. Between the oil sump 11 and the air passage 8, a valve structure is provided which closes when the air pressure of the passage 8 is large while opens when small. Furthermore, this valve structure is provided with a small cylinder 12 communicating with the air passage 8 and a metallic ball 13 positioned inside the cylinder 12 to lead oil in the sump 11 to the air passage 8 when the passage 8 has no air pressure while shuts of connection between one end of the cylinder 12 and the oil sump 11 when it has the air pressure.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention is applied to an automobile differential device that transmits power to both axles while absorbing a rotational difference between the two axles. The present invention
A pneumatically controlled clutch is utilized in a limited slip differential installed between both axles connected via a differential.

The present invention relates to a pneumatic seal structure for a passage that introduces air pressure from an air E generator fixedly attached to a vehicle body to a clutch that rotates together with an axle.

C Overview] The present invention provides an oil supply device for a pneumatic seal structure equipped with an By providing a valve structure between the air passage and the air passage, which closes when the air pressure is high and opens when the air pressure is low, oil is introduced into the air passage by utilizing fluctuations in the air pressure in the air passage, and the oil is introduced into the air passage. The X-ring is supplied with oil from the side.

[Conventional technology]

In a differential limiter with a pneumatically controlled clutch, the clutch and the pneumatic cylinder that drives the clutch are constructed to rotate with the axle. On the other hand, since the device that generates and controls air pressure is fixedly attached to the vehicle body, a mechanism is provided to connect the air pressure from the air pipe line attached to the vehicle body to the air passage that rotates with the axle.

FIG. 6 is a cross-sectional structural diagram of the mechanism that connects the air pressure. In this structure, the inner surface of a fixed ring 2 that grips the end of an air pipe line 1 attached to the vehicle body comes into contact with the outer peripheral surface of a collar 14 that is press-fitted into a differential case 16 that rotates with the axle. A groove 4 is formed on the outer peripheral surface of the differential case 16, and a hole 5 formed to pass through the inside and outside of the ring 2 communicates with this hole a4. 1 is connected. An air passage 8 is provided in the groove 4 on the outer peripheral surface of the differential case 16 to guide air pressure to the pneumatic cylinder 7 of the pneumatic clutch 6.

Here, the sliding surface between the inner surface of the ring 2 and the outer circumferential surface of the collar 14 is provided so that the air pressure introduced through the air pipe line 1 does not leak to the outside through this sliding surface. two x
Ring 9 is attached.

This X-ring 9 is fitted into a groove formed inside the ring 2, and its inner surface comes into sliding contact with the outer peripheral surface of the collar 14. The material of this X-ring 9 is synthetic rubber, and the groove is filled with grease so that the friction between it and the outer peripheral surface of the collar 14 is small, and the wear is small. 8 is provided.

[Problem to be solved by the invention]

In such a pneumatic seal structure, the X-ring wears out as the distance traveled by the vehicle increases, so the X-ring is replaced and maintained during periodic inspections.

The main cause of this X-ring wear is that the grease supplied between the inner surface of the X-ring and the outer peripheral surface of the collar is depleted.

The present invention improves this and aims to provide a device that can automatically lubricate the X-ring.

SUMMARY OF THE INVENTION An object of the present invention is to provide a device that can lengthen the exchange cycle of the X-ring.

[Means to solve the problem]

The present invention is provided between an air passage connected to a pneumatic clutch of a differential limiting device and rotates with the axle, and an air pipe line connected to a pneumatic control valve and fixed to the vehicle body, and provided on a rotating surface that rotates with the axle. In a lubricating device for a pneumatic seal structure equipped with an X-ring in sliding contact, an oil sump receiving oil splash inside the drive gear box is provided between the oil sump and the air passage, and the air pressure in the air passage is It is characterized by having a valve structure that closes when the valve is large and opens when the valve is small.

The valve structure includes a small cylinder communicating with the air passage;
It is arranged inside this small cylinder and has an outer diameter slightly smaller than the inner diameter of this small cylinder, and when there is no air pressure in the air passage, the oil in this oil sump is guided to the air passage, and when there is air pressure, this small cylinder a metal ball that moves to the other end of the cylinder to interrupt the connection between the other end of the small cylinder and the twenty oil sump, and the oil sump and the valve structure are connected to an air pipe fixed to the vehicle body. Preferably, one end of the channel is attached to a connected ring and attached to a member that rotates with said axle.

[Effect]

The valve structure installed between the oil reservoir on the ring that receives oil scattered inside the drive gear box and the air passage that supplies compressed air to the clutch opens when the clutch is disconnected and the air pressure is low. Slide the oil accumulated in the oil sump onto the collar
Replenish from inside the IJ song.

Additionally, when the clutch is engaged and the air pressure increases, the air pressure automatically closes the valve structure to prevent compressed air from leaking to the outside, and when the air pressure is low, oil drains from the oil sump. When the air pressure increases again, the oil that has flowed into various parts of the air passage is forcibly pushed back inside the x-ring.

As a result, oil can be automatically replenished from inside the X'IJ song, and a good lubrication condition can be maintained at all times, extending the life of the X'IJ song and extending the replacement cycle of the X'IJ song.

〔Example〕

Next, embodiments of the present invention will be described based on the drawings.

FIG. 1 is a side view showing the configuration of an embodiment of the present invention, and FIG. 2 is an enlarged cross-sectional view taken along the line AA shown in FIG.

The embodiment of the present invention is provided between an air passage 8 connected to a pneumatic clutch 6 of a differential limiting device and rotating together with the axle 3, and an air pipe 1 connected to a pneumatic control valve (not shown) and fixed to the vehicle body. The present invention also has an oil sump 11 that receives oil splashes inside the drive gear box 17, and a connection between this oil sump 11 and the air passage 8. A small cylinder 12 that communicates with the air passage 8 and a valve structure disposed inside the small cylinder 12 are provided between the air passage 8 and the air passage 8. , has an outer diameter slightly smaller than the inner diameter of this small cylinder 12, and guides the oil in the oil reservoir 11 to the air passage 8 when there is no air pressure in the air passage 8, and moves it to the other end of the small cylinder 12 when there is air pressure. The oil sump 11 and the valve structure include a metal ball 13 that blocks the connection between the other end of the small cylinder 12 and the oil sump 11. It is attached to the ring 2 to be connected.

Next, the operation of the embodiment of the present invention configured as described above will be explained. FIG. 3 is a diagram showing the state when the air pressure is not pressurized in the embodiment of the present invention, and FIG. 4 is a diagram showing the state when the air pressure is pressurized in the embodiment of the present invention.

When the pneumatic clutch 6 is in the disengaged state, the supply of compressed air from the air pipe line 1 is stopped, so the small cylinder 1
The metal ball 13 inside 2 is in a fallen state as shown in FIG. In this state, the oil accumulated in the oil reservoir 11 passes through the gap between the metal ball 13 and the small cylinder 12 and the gap between the outer periphery of the collar 14 and the inner periphery of the ring 2, and some of the oil is transferred to the X-ring 9. The oil is supplied from inside to the sliding surface with the collar 14 to automatically lubricate the X-ring 9 and the collar 14, and the remaining oil flows into the groove 4 provided on the outer periphery of the differential case 16.

An oil filter 10 is attached to the outside of the X ring 9, and the scattered oil is filtered by this oil filter 10 and is also supplied from the outside of the Xllll tag.

Further, when compressed air is supplied from the air pipe line 1 to bring the pneumatic clutch 6 into the engaged state, the compressed air passes through the groove 4 on the outer periphery of the differential case 16 and the inlet hole 14a of the collar 14, and then passes through the metal ball 13. Push up upward as shown in Figure 4.

The spherical surface of the pushed-up metal ball 13 comes into pressure contact with the circle ring 15 to prevent compressed air from leaking from the small cylinder 12.

Since leakage is prevented, the supplied compressed air passes through the air passage 8, pressurizes the pneumatic cylinder 7, presses the pneumatic clutch 6, and flows into the groove 4 when the pneumatic clutch 6 is in the open state. The oil is forcibly pushed out onto the sliding surface of the X-ring 9 and the collar 14, and oil is replenished from inside.

FIG. 5 shows another embodiment of the present invention in which an oil reservoir and a valve structure are provided in a differential case.

In the second example, since the differential case is a rotating body, the ability to accumulate oil in the oil sump 11 is inferior compared to the previous example, but since a large amount of oil is splashed while the car is running, it is difficult to accumulate oil inside the oil sump 11. Supply is possible, and oil from the oil reservoir 11 is introduced into the groove 4 via the pneumatic cylinder 7 and the air passage 8 when the pneumatic clutch 6 is in the disengaged state, passes from the groove 4 through the inlet hole 14a of the collar 14, and flows into the It is supplied inside the ring 9.

When the pneumatic clutch 6 is in the engaged state, the metal ball 1
3 is pushed up by the air pressure from the air pipe line 1 and comes into pressure contact with the O-ring 15 to prevent air leakage.

〔Effect of the invention〕

As explained above, according to the present invention, by introducing the splashed oil inside the drive gear box into the oil reservoir between the rotating surface and the sliding surface of the Oil can be supplied automatically, which has the effect of lengthening the replacement cycle due to X-ring wear.

[Brief explanation of drawings]

FIG. 1 is a side view showing the configuration of an embodiment of the present invention. FIG. 2 is an enlarged cross-sectional view taken along line AA shown in FIG. FIG. 3 is a diagram showing a state when air pressure is not pressurized in the embodiment of the present invention. FIG. 4 is a diagram showing a state when air pressure is increased in the embodiment of the present invention. FIG. 5 is a diagram showing the configuration of another embodiment. FIG. 6 is a diagram showing the configuration of a conventional example. 1... Air pipe line, 2... Ring, 3... Axle, 4
... Groove, 5... Hole, 6... Pneumatic clutch, 7.
...Pneumatic cylinder, butt...Air passage, 9...X ring, 10...Oil filter, 11...Oil sump, 12
...Small cylinder, 13...Metal ball, 14...Collar, 14a...Inflow hole, 15...0 ring, 16...
...Differential case, 17...Drive gear box, 18...Oil seal. Patent Applicant Hino Motors Co., Ltd. Agent Patent Attorney Nao Ide Komen dynamic heavy box example y 1 Figure 2 Figure example, ¥13 figure example 4 Figure E Z fruit 1ri i Idari兇 5 fig y 6 fig.

Claims (1)

[Claims] 1. An air passage connected to the pneumatic clutch of the differential limiting device and rotating with the axle, and an air pipe connected to the pneumatic control valve and fixed to the vehicle body, and rotating with the axle. In the oil supply device for a pneumatic seal structure equipped with an A lubricating device for a pneumatic seal structure, comprising a valve structure that closes when the air pressure is high and opens when the air pressure is low. 2. The valve structure includes a small cylinder that communicates with the air passage, and a small cylinder that is disposed inside the small cylinder and has an outer diameter slightly smaller than the inner diameter of the small cylinder, so that when there is no air pressure in the air passage, this oil is removed. 2. A metal ball that guides oil in the reservoir into the air passage and moves to the other end of the small cylinder when air pressure is present to interrupt the connection between the other end of the small cylinder and the oil sump. 1. A lubricating device for the pneumatic seal structure according to 1. 3. The oil supply device for a pneumatic seal structure according to claim 2, wherein the oil reservoir and the valve structure are attached to a ring to which one end of an air pipe line fixed to the vehicle body is connected. 4. The oil supply device for a pneumatic seal structure according to claim 2, wherein the oil reservoir and the valve structure are attached to a member that rotates together with the axle.