JPH0820787A - Grease - Google Patents

Abstract

PURPOSE:To obtain an inexpensive grease which is highly effective in preventing a sliding noise and has antiwear properties by incorporating into a base grease a given amount of a powder of ultrahigh-mol.wt. polyethylene having a specific average particle diameter. CONSTITUTION:A base oil, e.g. a mineral oil or a poly(alpha-olefin), is mixed with a thickener (e.g. a lithium soap) to produce a base grease. Thereto is added 3-20wt.% powder of ultrahigh-mol.wt. polyethylene having an average particle diameter of 10-30mum. The grease thus produced is suited for use in, e.g. a control cable 1 consisting basically of an inner cable 2 and an outer casing 3. Applying this grease to either the surface of the cable 2 or the inner surface of the casing 3 is effective in preventing a sliding part from making a friction noise.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a control cable,
The present invention relates to grease used for wind regulators and the like. More specifically, it relates to a grease that suppresses abnormal noise during sliding and has improved wear resistance.

[0002]

2. Description of the Related Art A control cable is basically composed of an outer casing and an inner cable, and generally a sliding resistance between the outer casing and the inner cable. In order to reduce wear and reduce wear, a lubricant is applied to the inner surface of the outer casing or the inner cable surface. Usually, in order to further reduce the sliding resistance, a tube-shaped resin liner is provided inside the outer casing, or a resin coat is provided on the inner cable surface. The liner and the inner coat are appropriately selected and produced from polyethylene, polyoxymethylene, fluororesin, polyamide, etc. depending on the application, required load, heat resistance and the like.

Cable type window regulators are basically guide rails, carrier plates, control cables, actuators (drum housing, drum,
Drive shaft), a handle, a guide, a pulley, and the like, and is generally coated with a lubricant in order to reduce sliding resistance and wear of each part.

As a lubricant for a control cable and for a wind regulator, Japanese Patent Application No. 5/1999 is filed by the present applicant.
-88474, Japanese Patent Application Laid-Open No. 4-212712 and Nippon Kokusai Oil Co., Ltd. (Location: 3-22 Nishirokugo, Ota-ku, Tokyo)
-5) Grease T of "Nippeko LT" made of grease
As described in "Technical Sheet N-05a", mineral oils, hydrocarbon oils, silicone oils, and greases containing them as a base oil and a metal soap as a thickener are usually used. Further, a silicone grease containing a mixture of tetrafluoroethylene which is a solid lubricant and a melamine cyanuric acid adduct as a thickener has improved slidability and wear resistance, which is disclosed in JP-A-2-16193. It is described in.

However, in response to the recent demands for better filling and the demand for reliability under more severe conditions, the conventionally used lubricants cause abnormal noise and a large amount of wear and play. And the requirements are not fully satisfied. If the grease described in JP-A-2-16193 is used, slidability and wear resistance are improved, but it is expensive and oil retention is sufficient because a solid lubricant is used as a thickener. Not.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to provide an inexpensive grease which suppresses abnormal noise during sliding and has improved wear resistance.

[0007]

The grease of the present invention is characterized in that 3 to 20% by weight of ultra high molecular weight polyethylene powder having an average particle diameter of 10 to 30 μm is added to the base grease. I am trying.

A poly-α-olefin is preferably used in a part or all of the grease base oil.

It is more preferable that lithium soap is used as the thickener for the grease.

The grease for a control cable of the present invention comprises 3 to 20% by weight of ultrahigh molecular weight polyethylene powder having an average particle diameter of 10 to 30 μm with respect to the base grease.
It is characterized by being added.

The wind regulator grease of the present invention comprises 3 to 20% by weight of an ultrahigh molecular weight polyethylene powder having an average particle diameter of 10 to 30 μm based on the base grease.
It is characterized by being added.

[0012]

The grease of the present invention has an average particle size of 10 to 30.
Ultra high molecular weight polyethylene powder of μm (hereinafter, UPE
It is possible to suppress the frictional noise at the sliding portion and improve the wear resistance. The sliding portion is the outer casing of the control cable and the sliding portion of the inner cable and the window regulation.
There is a possibility that target components such as the part where the carrier plate slides on the guide rail of the motor, the part where the spring or shaft in the housing slides with the housing slide, and abnormal noise or wear occurs. Is a concept that includes all parts.

[0013]

EXAMPLES While the average particle size of general polyethylene powder is 200 to 300 μm and the molecular weight thereof is 250,000 to 250,000, the UPE powder has an average particle size of 10 to 30 μm.
Since it has a very small value of m and a large molecular weight of 2,000,000, it has a low wear coefficient, excellent self-lubricating property, and excellent wear resistance. By adding this UPE powder as an additive to the grease, the sliding property and wear resistance of the grease can be improved. It should be noted that if the particle size is large, a rough feeling occurs, and if it is too small, sufficient slidability cannot be obtained. If the amount of UPE powder added is less than 3% by weight, the effect is not obtained, and if it exceeds 20% by weight, the characteristics are rather deteriorated. The cost of UPE powder is about 1/4 of the cost of polytetrafluoroethylene powder (hereinafter referred to as PTFE powder).
Is.

As the base oil of the grease, a mineral oil or a synthetic oil which can be used over a wide viscosity range, a wide temperature range, etc. was used. In particular, silicone oil and poly-α-olefin oil were used to improve low temperature properties.

Further, various metallic soaps are often used as a thickening agent for grease. Among them, the grease using lithium soap as a thickener has excellent water resistance, can be used up to a maximum temperature of about 140 ° C, has good mechanical stability, and is used as a general-purpose grease for various purposes. .

Next, the grease of the present invention will be described based on Examples and Comparative Examples, but the present invention is not limited to such Examples.

Example 1 Mineral oil as a base oil and lithium soap as a thickener were mixed in a weight ratio of 17: 3, and a grease treatment was carried out.
This was used as a base grease, and the average particle size as an additive was 2
3 μ% of 0 μm UPE powder was added to the base grease, and the mixture was stirred uniformly to prepare the grease of Example 1. All UPE powders used in the following examples had the same average particle diameter of 20 μm as in Example 1.

Example 2 A grease similar to that of Example 1 was prepared except that UPE powder as an additive was added in an amount of 10% by weight based on the base grease.

Example 3 A grease similar to that of Example 1 was prepared except that 20% by weight of UPE powder as an additive was added to the base grease.

Example 4 A base grease was used as "Nippeko LT" manufactured by Nippon Sekiyu Co., Ltd.
A grease similar to that of Example 1 was prepared except that UPE powder as an additive was added in an amount of 10% by weight based on the base grease.

Example 5 A grease similar to that of Example 1 was prepared except that the base oil was poly-α-olefin and the additive UPE powder was added in an amount of 10% by weight based on the base grease. did.

Example 6 Base grease was manufactured by Kyodo Yushi Co., Ltd. under the trade name of "Multemp T".
A ", and the same grease as in Example 1 was prepared except that UPE powder having an average particle diameter of 20 μm as an additive was added in an amount of 10% by weight based on the base grease.

Comparative Example 1 Mineral oil as a base oil and lithium soap as a thickening agent were mixed in a weight ratio of 17: 3 and subjected to a grease treatment,
This was used as a base grease, which was stirred uniformly without adding an additive to prepare a grease of Comparative Example 1.

Comparative Example 2 A grease similar to Comparative Example 1 was prepared except that 1% by weight of UPE powder as an additive was added to the base grease.

Comparative Example 3 A grease similar to Comparative Example 1 was prepared except that 10% by weight of PTFE powder having an average particle diameter of 20 μm as an additive was added to the base grease.

Comparative Example 4 Base grease is “Nippeko LT” manufactured by Nippon Kyushu Co., Ltd.
A grease similar to that of Comparative Example 1 was manufactured except for the above.

Comparative Example 5 A grease similar to Comparative Example 1 was prepared except that the base oil was poly-α-olefin.

Comparative Example 6 Base grease is "Multemp T" manufactured by Kyodo Yushi Co., Ltd.
A grease similar to that of Comparative Example 1 was prepared except that it was "A".

Next, the grease of the present invention will be described with reference to the drawings.
A control cable and a wind regulator using a frame will be described.

FIG. 1 is a schematic sectional view of one embodiment of a control cable using the grease of the present invention, and FIG. 2 is another embodiment of the control cable using the grease of the present invention. FIG. 3 is a schematic sectional view, FIG. 3 is an explanatory view showing an embodiment of a wind regulator using the grease of the present invention, and FIG. 4 is an explanatory view of an apparatus for measuring abnormal noise of the grease of the present invention. is there.

The normal structure of the control cable is shown in FIG.
2 and FIG. The control cable 1 is basically composed of an outer casing 3 and an inner cable 2. The outer casing 3 is usually an armor layer 4 made of a shield wire or a spiral tube. And a protective layer 5. Further, a tube-shaped liner 6 may be provided inside the armor layer 4, and an inner coat 7 may be provided on the outer surface of the inner cable 2.

Next, the wind regulator will be described. As shown in FIG. 3, an inner cable having a guide rail 22 attached to an automobile door 21 and a rotary pulley 23 at the upper end, a sliding guide 24, and a sliding guide 25 at the lower end coated with grease. 2 has been passed over. Inner
The cable 2 is further inserted from the upper end of the guide rail 22 into the outer casing 3 and wound around a drum (not shown) of an actuator 26. On the other hand, a carrier plate 28 is attached to the lower end of the window glass 27 of the door.
An inner cable 2 stretched over a guide rail 22 is fixed at 8. Grease is applied to each of the above sliding parts.

In the above window regulator 20, the window glass 27 is opened and closed by the handle 29 of the actuator 26 shown in FIG. 4 via the drive shaft 30, the inner cable 2 and the like, and the window glass 27 is closed. When doing so (when pulling up the window glass upward), it was confirmed whether or not abnormal noise was generated due to friction between the spring 31 and the housing cover 32. The spring 31 was not plated, and the housing cover 32 was Zn plated. This is the abnormal noise test.

On the other hand, the wear resistance was evaluated by the Timken load bearing performance test method (JIS K2220). As the test conditions, the rotation speed of the rotating shaft was 800 rpm, the load was 13.3 N (N: Newton), the test time was 10 minutes, and the test temperature was room temperature. However, if the test block is Zn
A plate was used and the amount of wear after the test was recorded. This is the abrasion test.

Table 1 shows the results of the abnormal noise test and the abrasion test of Examples 1 to 6 and Comparative Examples 1 to 6.

[0036]

[Table 1]

First, the presence or absence of abnormal noise in the abnormal noise test is compared. In comparison with Comparative Example 2 in which 1 wt% of UPE powder as an additive was added to the base grease and Comparative Examples 1 and 4 to 6 in which no additive was added, noise was generated. 3 UPE powder to base grease
No abnormal noise is generated in Examples 1 to 6 in which .about.20% by weight is added and Comparative Example 3 in which 10% by weight of PTFE powder is added to the base grease.

Next, the wear widths in the wear test will be compared. The wear width of Comparative Example 2 in which 1 wt% of UPE powder as an additive was added to the base grease and Comparative Examples 1 and 4 to 6 in which no additive was added were 1.9 to 2.1 mm. On the other hand, UPE powder as an additive was added in an amount of 3 to 20% by weight based on the base grease and Examples 1 to 6 and PTFE powder were added in an amount of 10% by weight based on the base grease. It can be seen that the wear width of Comparative Example 3 is 1.3 to 1.5 mm.

As described above, UPE powder which is an additive is added.
In Examples 1 to 6 in which 3 to 20% by weight was added to the base grease, 10% by weight of PTFE powder, which was an additive, was added to the base grease in the abnormal noise test and the abrasion test. It can be seen that it has the same performance as that of Comparative Example 3 described above.

[0040]

The grease of the present invention has an average particle size of 10
Since UPE powder having a thickness of -30 μm is added in an amount of 3 to 20% by weight based on the base grease, abnormal noise during sliding is suppressed, abrasion resistance is provided, and the price is low.

[Brief description of drawings]

FIG. 1 is a schematic sectional view of an embodiment of a control cable using the grease of the present invention.

FIG. 2 is a schematic explanatory view of another embodiment of the control cable using the grease of the present invention.

FIG. 3 Wind regulation using the grease of the present invention
It is explanatory drawing which shows one Example of the data.

FIG. 4 is an explanatory diagram of an apparatus for measuring abnormal noise of grease according to the present invention.

[Explanation of symbols]

 1 Control Cable 2 Inner Cable 3 Outer Casing 20 Wind Regulator

Continuation of the front page (51) Int.Cl. ⁶ Identification number Office reference number FI technical display location C10M 107: 02 117: 02 143: 02) C10N 10:02 30:00 F 30:06 40:32 50:10

Claims (5)

[Claims] 1. An ultra-high molecular weight polyethylene powder having an average particle size of 10 to 30 μm is 3 to 3 parts with respect to a base grease.
20% by weight added grease. 2. The grease according to claim 1, wherein a part or all of the base oil of the grease is poly-α-olefin. 3. The grease according to claim 1, wherein the thickener for the grease is lithium soap. 4. The grease of claim 1, 2 or 3 which is a grease for control cables. 5. The grease according to claim 1, 2 or 3, which is a wind regulator grease.