JPS5891923A - Connecting device of power transmitting member in driving shaft - Google Patents

Abstract

PURPOSE:To improve close attaching and oleophilic characteristics and load and seizure resistances, by coating a foundation film and lubricating film arranged on said foundation film onto the surface of a power transmitting contact face. CONSTITUTION:A comparison flange 9 and driving pinion shaft 1 are strongly tightened by a nut 11 to forcibly contact the flange 9, oil slinger 13, bearing inner ring 2a, spacer 12 and inner ring 3a of a bearing 3 to one another. Surfaces of the slinger 13 are coated by a low frictional material layer 14 consisting of a foundation film 15 and lubricating film 16 containing a solid lubricating agent and arranged to a surface side of the film 15. To decrease frictional resistance of each tightened part, said coating applied to the surface of a power transmitting contact face is provided with good adhesivity and oleophilic characteristics.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a connection device between a drive shaft and a rotating shaft member that is tightly connected to the drive shaft and rotates together with power transmitted from the drive shaft, and is particularly applicable to a differential oil slinger. The present invention relates to a drive shaft power transmission member connecting device suitable for

Conventionally, there has been a sudden slippage between the drive shaft and the rotating shaft parts that are tightly connected to the drive shaft and rotate together as power is transmitted from the drive shaft, leading to abnormal noise. This was a practical problem.

Therefore, regarding this point, we coated a steel oil slinger, etc. with a synthetic resin containing fluororesin to form a low-friction synthetic resin coating layer on the oil slinger, etc., thereby eliminating the above-mentioned problems that were previously thought to be unavoidable. A device has been proposed that eliminates abnormal noise and also prevents wear due to friction between connected parts.

However, synthetic resin coating materials containing this type of fluororesin have weak adhesion to the base material, do not have very high separation strength, and are susceptible to oiliness, making it difficult to apply surface pressure to the target material. Although it is effective for those with a surface pressure of 600 or less,
For example, it is not necessarily preferable for use in large vehicles such as diesel engines.

Therefore, the present invention seeks to provide a power transmission member connecting device for a drive shaft that can improve the adhesion and lipophilicity of the synthetic resin coating material to the base material, thereby improving load resistance and seizure resistance. It is something to do.

Therefore, in the present invention, a first rotating body having a mounting hole, a second rotating body fitted into the mounting hole and connected to the first rotating body in the rotational direction, and a second rotating body are provided. A power transmission system is formed including a bearing that rotatably supports a rotating body in a fixed case, and the bearing between a step provided on the second rotating body and an end of the first rotating body. A device comprising a power transmission path for applying pressure in the axial direction to the power transmission path, and a tightening means for applying axial pressure to the power transmission path, the surface of at least one of the power transmission contact surfaces of the power transmission path being coated with a base film and this. It is characterized by depositing a low-friction material field consisting of a lubricating film containing a solid lubricant disposed on a base film.

The present invention will be explained below with reference to the drawings. FIG. 1 shows a drive pinion support portion of a final reduction gear of an automobile, and in the figure (1) is a drive pinion shaft connected to a drive shaft from a prime mover.

This drive pinion shaft (1) is driven by a pair of conical roller bearings (2) and (3) arranged at a required interval in the axial direction.
The void gear (5), which is rotatably supported within the housing (4) and is integrally provided at its base end, operates the wheels via a differential installed on a ring gear (6) that meshes with the void gear (5). It is designed to rotate the shaft.

At the tip of the drive pinion shaft (1), an external spline (7) and a male screw section (8) are provided at the tip, and a drive shaft from the prime mover is connected to the external spline (7). An internal spline 0Q provided on the companion 7 flange (9) is engaged with the spline.

And companion 7 lunge (9) ld,! Threaded part (8
) to! The mounted nut prevents the pinion from coming off in the axial direction from the live pinion shaft 1).

Said nut α is also a konnoku nioshi flange (9)
In addition to fixing, the tightening force applies an appropriate axial load (preload) to the conical roller bearings (2) and (3) to determine the amount of axial movement of the drive pinion shaft (1) during torque transmission. It plays a role in reducing the Then, the inner rings (2a) of the conical roller bearings (2), (3) and (
A cylindrical spacer α2 is inserted between the companion 7 flange (9) and the conical roller bearing (21), and a steel oil slinger a] is interposed between the companion 7 flange (9) and the conical roller bearing (21).

Therefore, the companion 7 flange (9) and the drive pinion shaft (1) are strongly tightened by the nut 0η, and the companion flange (9), the drive pinion shaft (1),
Inner ring (2α) of conical roller bearing (2), spacer (2),
Since the inner rings (3α) of the conical roller bearing (3) are in pressure contact with each other, while the driving force applied to the drive pinion shaft (1) is small, the rotation of the companion 7 flange (9) is due to the contact between the above-mentioned parts. Drive pinion shaft (1
), and on the other hand, when the driving force transmitted to the companion 7 lunge (9) becomes large and exceeds the contact friction force between the above-mentioned parts and reaches a torque determined from the friction coefficient between each part, the surface There was a slippage in both splines (7).
), rotation is transmitted by the coherence of α1. In particular, when the coefficient of friction between each part is large as in this case, a large amount of elastic energy is accumulated in each part before slipping occurs, so when the rotational torque exceeds the frictional resistance torque due to the tightening axial force, each part It most often occurs between the spanion flange (9) and the oil sling α at some or all of the contact surfaces between the parts.

By the way, this abnormal noise is caused by the large frictional resistance of each tightened part as described above, which causes a large amount of elastic energy to be accumulated between each part before slippage occurs.
This is due to the fact that when the rotational torque exceeds a certain level, this accumulation disappears all at once, causing sudden slippage.
By preventing this accumulation, the occurrence of abnormal noise can be prevented.

Therefore, in this embodiment, as shown in FIG. 2, the surface of the oil slinger α is coated with a low-friction material layer α.
It is composed of a base film 4 with a thickness of about μm and a lubricant film 0Q containing a solid lubricant disposed on the surface side thereof. This lubricating film 0Q is made of a low-friction synthetic resin, such as a fluororesin, a phenol resin, or an epoxy resin binder, and contains tetrafluoroethylene resin, molybdenum disulfide, tungsten disulfide, graphite, and boron nitride. It is formed by a mixture obtained by appropriately selecting and adding from
It is applied by spraying, dipping, brushing, etc. The thickness of this lubricating film is preferably 20 μm or less, but it is even better if it has a thickness of 3 to 10 P″′C.

To form this low-friction material layer α
After degreasing at 70°C, it is washed with water, and then washed with hot water to remove the alkali IJe attached to the surface.

Next, this oil slinger (2) is immersed in an aqueous manganese phosphate solution at 85 to 95°C or subjected to soft nitriding treatment to form a base film on the entire surface, and this is further washed with hot water and heated with warm air. dry. Then, on top of this base film,
A mixture having any of the compositions shown in 1 to 4 from Al to 4 is coated by any of the methods described above, and this is baked at 180°C for 30 minutes or at 150°C for 1 hour to form a lubricating film.

In addition, when using a manganese phosphate conversion film as the base film (b), it is possible to shorten the processing time by adding an accelerator to the manganese phosphate processing solution. ″1
The base film may be not only manganese phosphate and nitrocarburized, but also zinc phosphate, chromate, carburized, and sulfurized chemical conversion coatings.

In the thus obtained low-friction material layer 0Φ, the base film α→ is applied to improve corrosion resistance since the oil slinger α1 is used in oil.
Since the manganese phosphate chemical conversion coating has unevenness on its surface, it has a strong adhesion force with the oil slinger α side and the lubricating coating aQ side, and has the effect of effectively preventing the low friction material layer 04 from separating. It also has Furthermore, the lipophilicity of the lubricating film 0Q is improved by an additive such as molybdenum disulfide added to the phenol resin or the like as a binder. As described above, the low-friction material layer Q4 is rich in lipophilicity and has a large adhesion force, and therefore can significantly improve load resistance and seizure resistance.

As shown in Fig. 4, the applicant proposes a thrust swing system that includes a main body (a) to which a load is applied in the direction of arrow A and an air cylinder (c) that reciprocates the main body around its axis. Using a testing machine, the friction and wear characteristics of a test piece caused by a cylindrical mating material were measured under the following test conditions.

As the test pieces (1), the above-mentioned cloth-1 was coated with the above-mentioned film according to the present invention on a steel base material, and 7 was coated with tetrafluoroethylene resin. Ta.

Test condition load: 600.800.1000, 1200.15
00.1900 - speed) Speed: 0.2 sin/s 8
C Lubricating oil: Gear oil C#90) Number of times of dripping: 2
00 times (swing angle 20 degrees) As a result, the conventional one had a load of 600k) and - was good, but so
For / and =, the coatings were separated and adhesion between the steel base material and the other material was observed.

On the other hand, the material of the present invention maintained good properties even under a load of 1,900 to 1,900 yen.

From the above, it can be confirmed that the product of the present invention has excellent load resistance and seizure resistance.

In addition, in the above explanation, the case where the low friction material layer α4 is applied to the oil slinger 0 has been explained, but it may be applied to one spacer α.

As explained above, the present invention provides a base film and a lubricating film/film containing a solid lubricant disposed on the base film on at least one surface of the power transmission contact surface of the power transmission path. Since the low-friction material layer is applied, adhesion and lipophilicity are increased, and the load carrying capacity and seizure resistance can be significantly improved.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing an embodiment of the present invention, Fig. 2 is an enlarged sectional view of an oil slinger, Fig. 3 is a partially enlarged view of Fig. 2, and Fig. 4 is a schematic diagram of a thrust swing test machine. It is. +t+:' Drive pinion shaft, (2), (3) biconical roller bearing (4): Housing, (9): Companion flange, α]): Nut, A2 spacer, 03 = Oil slinger Cl4 = Low friction layer , to): Base film 0Q: Lubricating film - P I F+ Figure 3 3 Figure 4

Claims (4)

[Claims] (1) A first rotating body having a mounting hole, and a second rotating body that is fitted into the mounting hole and connected to the first rotating body in the rotational direction.
a rotating body, a bearing rotatably supporting the second rotating body in a fixed case, a step provided on the second rotating body, and a first rotating body.
A device comprising: a power transmission path including the bearing to form a power transmission system between an end of a rotating body; and a tightening means for applying axial pressure to the power transmission path; A low-friction material layer consisting of a base film and a lubricant film containing a solid lubricant disposed on the base film is deposited on at least one of the power transmission contact surfaces of the A power transmission member connection device for a drive shaft. (2) The lubricating film is made of tetrafluoroethylene resin, molybdenum disulfide, tungsten disulfide, graphite,
Claim 1, characterized in that at least one solid lubricant selected from boron nitride and boron terrade is bound by a binder of fluororesin, phenol resin, resin, or epoxy resin. The power transmission member connection device for the drive shaft described above. (3) The base film is comprised of one type of chemical conversion film selected from manganese phosphate, soft nitrided, zinc phosphate, chromate, carburized, and sulfurized. 3. The drive shaft power transmission member connection device according to claim 2. (4) The power transmission member connecting device for a drive shaft according to any one of claims 1, 2, and 3, wherein the power transmission contact surface is an oil slinger.