JP2793228B2 - Lubricant for control cable and control cable using the same - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a control cable lubricant and a control cable in which the lubricant is interposed between an inner cable and a conduit. More specifically, even in a high load area, a stick-slip does not occur, and a lubricant for a control cable that can smoothly perform the sliding operation of the inner cable, and the lubricant is interposed between the inner cable and the conduit. Control cable.

2. Description of the Related Art A control cable basically includes a flexible conduit and a single flexible inner cable slidably inserted into the conduit. , By applying push-pull operation, rotation operation or an operation combining them, remote control of a driven device attached to the other end of the inner cable, for example, transmission, brake,
It is used to operate clutches, speedometers, etc.

As the inner cable, a cable obtained by twisting a plurality of metal wires or a cable reinforced by applying a synthetic resin coat to the outer periphery thereof or wrapping a flat steel wire around the inner cable is used. The conduit is, for example, a spiral tube in which one or a plurality of flat steel wires or round steel wires are densely wound in a coil shape, and a protective layer made of a synthetic resin provided outside the spiral tube. Is used.

However, since the sliding resistance increases when the conduit and the inner cable come into direct contact with each other, for example, as disclosed in Japanese Patent Application Laid-Open No. 60-231009, a liner of a synthetic resin flexible tube is provided on the inner periphery of the conduit. The liner is made of a synthetic resin such as polyethylene, polyoxymethylene, polybutylene terephthalate, or polytetrafluoroethylene.

In addition, in order to further reduce the sliding resistance between the liner and the inner cable, taking into account the effect on the control cable load efficiency {(load / operating load) × 100}, for example, dimethylpolysiloxane oil, olefin Synthetic oils such as oils and mineral oils, and greases based on these oils, as well as oils and greases containing antioxidants, rust inhibitors, extreme pressure agents, etc., are used as lubricants for control cables. Have been.

However, in such a conventional control cable, when the inner cable whose outer peripheral surface is coated with a synthetic resin and the synthetic resin liner slide, a stick-slip cannot be formed with a conventionally used lubricant. Because
There is a problem that it is difficult to perform a smooth sliding operation.

[Problems to be Solved by the Invention] Therefore, the inventors of the present invention have studied diligently to provide a control cable that reduces stick-slip when the inner cable and the conduit slide, and that allows the inner cable to slide smoothly. As an essential component, an organopolysiloxane oil-based lubricating oil containing an amine-modified organopolysiloxane oil in which an amino group is directly bonded to a silicon atom via at least one carbon atom, or the lubricating oil as a main component When grease is used, the stick-slip is improved, especially when using an inner cable with a synthetic resin coating on the outer peripheral surface and a synthetic resin liner, such stick-slip is extremely improved. For the first time, they have found a completely new fact that they have completed the present invention.

[Means for Solving the Problems] That is, the present invention comprises, as an essential component, an amine-modified organopolysiloxane oil in which an amino group is directly bonded to a silicon atom via at least one carbon atom, and has a kinematic viscosity at 25 ° C. A control cable lubricant comprising an organopolysiloxane oil-based lubricating oil of 25 to 150,000 cSt or grease containing the lubricating oil as a main component, a flexible conduit, and an inner cable slidably inserted into the conduit. A control cable comprising: an organopolysiloxane oil-based lubricating oil comprising an amine-modified organopolysiloxane oil in which the amino group is directly bonded to a silicon atom via at least one carbon atom as an essential component; A control cable, characterized in that grease mainly composed of lubricating oil is interposed between the inner cable and the conduit. That.

[Operation and Examples] As described above, the lubricant for control cables of the present invention contains, as an essential component, an amine-modified organopolysiloxane oil in which an amino group is directly bonded to a silicon atom via at least one carbon atom. Kinematic viscosity at 25 ° C is 25 ~
It is an organopolysiloxane oil-based lubricating oil of 150,000 cSt or a grease containing the lubricating oil as a main component.

Here, an amine-modified organopolysiloxane oil in which an amino group is directly bonded to a silicon atom through at least one carbon atom is a compound in which an amino group is bonded to a silicon atom in a polysiloxane through at least one carbon atom. If so, the molecular structure, the type of silicon-bonded monovalent hydrocarbon group and the number of carbon atoms, the type of amino group and its content and its location, and the type of molecular chain end-blocking group, There is no limitation.

The molecular structure of the amine-modified organopolysiloxane oil in which the amino group is directly bonded to a silicon atom via at least one carbon atom may be either linear or branched. From the viewpoint of easiness, it is preferable to be linear.

Examples of the silicon-bonded monovalent hydrocarbon group include a methyl group, an alkyl group having 2 to 12 carbon atoms, a phenyl group and a 2-phenylpropyl group. It is preferable that the compound contains at least 50 mol% of a methyl group since the temperature dependency of the viscosity change is reduced.

Examples of the amino group include a primary amino group and a secondary amino group. Representative examples of the monovalent hydrocarbon group having at least one amino group bonded thereto include, for example, a 2-aminoethyl group, a 3-aminopropyl group, and a 3-aminopropyl group.
And an aminoalkyl group such as (N-aminoethyl) aminopropyl group. The aminoalkyl group is an amine-modified organopolysiloxane in which the amino group is directly bonded to a silicon atom via at least one carbon atom. It may be present at one or both of the side chain and the molecular chain end of the oil. The aminoalkyl group accounts for 0.1 to 50 mol%, preferably 0.5 to 20 mol%, in one molecule of the amine-modified organopolysiloxane oil in which the amino group is directly bonded to a silicon atom via at least one carbon atom. It is desirable that it be contained. When the content is less than 0.1 mol%, stick-slip tends to occur easily, and when the content is more than 50 mol%, the effect is particularly improved as compared with the content of less than 50 mol%. No difference is seen.

Examples of the molecular chain terminal blocking group include a trimethylsiloxy group, a dimethyl (aminoalkyl) siloxy group,
Among them, silanol group, alkoxy group and the like can be mentioned, and among these, trimethylsiloxy group and dimethyl (aminoalkyl) siloxy group are easily manufactured or amino group is directly bonded to silicon atom via at least one carbon atom. It is particularly preferred in view of the stability of the amine-modified organopolysiloxane oil used.

The amine-modified organopolysiloxane oil in which the amino group is directly bonded to a silicon atom via at least one carbon atom has a kinematic viscosity at 25 ° C. of 25 to 25 when used alone as a lubricating oil. It is desirably 150,000 cSt, preferably 100 to 30,000 cSt. Such kinematic viscosity is
When it is smaller than 25 cSt, an amine-modified organopolysiloxane oil in which the amino group is directly bonded to a silicon atom via at least one carbon atom tends to be easily exhibited, and 150,000 cSt is used. If it exceeds, the oil film forming property tends to be easily reduced.

When the amine-modified organopolysiloxane oil in which the amino group is directly bonded to a silicon atom via at least one carbon atom is used in combination with another organopolysiloxane oil, the amino group has at least one carbon atom. The kinematic viscosity at 25 ° C. of an amine-modified organopolysiloxane oil which is directly bonded to a silicon atom via the above is the amine-modified organopolysiloxane oil wherein the amino group is directly bonded to the silicon atom via at least one carbon atom. The kinematic viscosity at 25 ° C. of the mixture of the siloxane oil and the other organopolysiloxane oil is not particularly limited as long as it is within the range of 25 to 150,000 cSt. In view of the above, it is preferably 5 to 300,000 cSt, especially preferably 10 to 30,000 cSt.

Specific examples of the other organopolysiloxane oil include dimethyl polysiloxane oil, methyl alkyl polysiloxane oil having 2 to 12 carbon atoms in the alkyl group, and methylphenyl polysiloxane oil.

The kinematic viscosity at 25 ° C. of the other organopolysiloxane oil is not particularly limited, but if it is too low, it tends to volatilize, and if it is too high, the film-forming property and the mixing property are poor. 10-300,00
It is preferably 0 cSt, especially 100-150,000 cSt.

Since the content of the amine-modified organopolysiloxane oil in which the amino group is directly bonded to the silicon atom via at least one carbon atom in the mixed oil, the content varies depending on the content of the aminoalkyl group. Although it is not possible, it is usually preferably adjusted appropriately from 0.01% by weight to less than 100% by weight, preferably from 0.05 to 80% by weight. When the content is less than 0.01% by weight, stick-slip tends to easily occur.

In the present invention, the amine-modified organopolysiloxane oil or the mixed oil wherein the amino group is directly bonded to a silicon atom via at least one carbon atom,
For example, a grease-like material obtained by appropriately compounding a thickener such as lithium soap or fluororesin powder may be used. The compounding amount of such a thickener is appropriately adjusted according to the kinematic viscosity of the amine-modified organopolysiloxane oil in which the amino group is directly bonded to a silicon atom via at least one carbon atom or the mixed oil. But usually an amine-modified organopolysiloxane oil or mixed oil wherein the amino group is directly bonded to a silicon atom via at least one carbon atom
It is preferably from 3 to 100 parts by weight, especially from 5 to 50 parts by weight, per 100 parts by weight. When the amount is less than 3 parts by weight, the shape retention as grease tends to be poor, and when the amount exceeds 100 parts by weight, the oil film forming property tends to be poor.

In the present invention, if necessary, the amino group is an amine-modified organopolysiloxane oil directly bonded to a silicon atom via at least one carbon atom or a grease thereof, or the mixed oil or a grease thereof. The organopolysiloxane oil-based lubricating oil or the grease containing the lubricating oil as a main component may contain a pigment or a heat-resistance imparting agent such as an organic amine compound or a transition metal compound.

Next, the control cable of the present invention will be described with reference to the drawings.

FIG. 1 is a partially cutaway perspective view showing an embodiment of a pull control cable used for operating a clutch or a brake of an automobile.

(1) is an inner cable, (2) is a conduit, (3) is a synthetic resin coating of the inner cable, and (4) is a liner. In the present invention, the synthetic resin coating (3) may not be provided, but is preferably provided to improve load efficiency. The inner cable (1) is a wire rope having a 7 × 7 structure formed by twisting seven steel wires to form one strand and twisting the strands, and has an outer diameter of 3.0 mm. The conduit (2) has a single rectangular cross section (thickness 1.30mm, width 2.
40mm) steel strip is spirally and closely wound on a liner (4) to form a tubular (outer diameter: 8.60mm, inner diameter: 6.00mm) armor layer (5), and its outer circumference is coated with a thickness of 0.7mm And a protective layer (6) of a synthetic resin such as polypropylene. The synthetic resin coating (3) is a layer made of a resin such as polybutylene terephthalate and having a thickness of about 0.35 mm and coated on the outer periphery of the inner cable (1).
3.7 mm. Liner (4) is 4.6mm inside diameter, 5.7mm outside diameter
And a resin tube formed of, for example, polybutylene terephthalate.

There is a gap of 0.9 mm in diameter between the outer periphery of the synthetic resin coating (3) and the inner periphery of the liner (4).

The number of strands constituting the inner cable (1) and the number of steel strands constituting the strand are not particularly limited, and various conventionally known combinations can be employed.

The conduit (2) may have a shield layer in which a plurality of metal wires or synthetic resin wires are wound around the liner (4) with a gentle spiral instead of the armor layer (5). . Further, various conventionally known materials such as polypropylene and polyvinyl chloride can be used as the protective layer (6).

That is, the present invention relates to any control cable as long as a synthetic resin coating (3) is formed on the outer peripheral surface of the inner cable (1) and a liner (4) is formed over substantially the entire inner circumference of the conduit (2). The present invention is not limited to the configuration of the inner cable or the conduit. In order to reduce the stick-slip, it is preferable that a liner (4) made of synthetic resin is provided over almost the entire area of the conduit (2), but it is not always necessary to provide the liner.

Examples of the synthetic resin used for the synthetic resin coating (3) include polyethylene, polyoxymethylene, polybutylene terephthalate, polytetrafluoroethylene, and polyamide, but the present invention is limited to only such synthetic resin. Instead, other synthetic resins can be used.

In the present invention, when the synthetic resin coating (3) and the liner (4) are formed as described above, it is particularly preferable because the stick-slip is extremely improved. Even if only one of the liners (4) is provided, the stick slip is improved as compared with the conventional case.

Next, the control cable of the present invention will be described in more detail based on embodiments, but the present invention is not limited to only such embodiments.

Example 1 100 parts by weight of dimethylpolysiloxane oil having a kinematic viscosity at 25 ° C of 100,000 cSt was added with a kinematic viscosity at 25 ° C of 1200 cSt.
St is a straight-chain amino group containing 2 mol% of 3- (N-aminoethyl) aminopropyl group and other organic group being methyl group directly bonded to silicon atom via at least one carbon atom. Amine-modified organopolysiloxane oil (hereinafter referred to as amine-modified organopolysiloxane oil A)
5 parts by weight) are mixed uniformly, and the kinematic viscosity at 25 ° C
89,300 cSt lubricant was obtained.

A control cable having the structure and dimensions shown in FIG. 1 was used. On the outer periphery of the armor layer (5), a protective layer (6) of a synthetic resin (polypropylene) coated with a thickness of 0.7 mm is provided. The outer peripheral surface of the inner cable (1) was coated with polybutylene terephthalate so as to have an outer diameter of 3.7 mm. In the liner (4), polybutylene terephthalate was formed on the outer peripheral surface of the conduit (2) so as to have an inner diameter of 4.6 mm and an outer diameter of 5.7 mm.

The lubricant obtained above was applied to the inner cable (1) of the control cable at a rate of 0.5 g per 1 m in length.

The stick-slip ratio and load efficiency as physical properties of the obtained control cable were measured according to the following methods. Table 1 shows the measurement results.

(Stick Slip Rate and Load Efficiency) The test apparatus will be described with reference to FIG. Constant temperature box (1
The bending radius of inner cable (1) is 150mm and bending angle is 18 in 1).
A control cable of a specimen which was curved in a semicircular shape so as to be 0 ° was attached. A lever (12) is attached to the input end of the inner cable (1), and a spring (13) for applying a load is attached to the load end.
In the middle of the input side of the inner cable (1), the load cell (14)
However, another load cell (15) is attached in the middle of the load side. The test was performed by operating the lever (12) until the load on the load side exceeded 200 kgf.

The load efficiency is determined by setting the temperature-controlled box (11) at the specified temperature (room temperature and 140 ° C).
° C) and measured as follows.

The lever (12) shown in FIG. 2 was pulled to apply an input load and operated up to a maximum load of 210 kg. Next, the input load was slowly restored. After repeating this operation 10 times, the 11th input load and applied load were measured with the load cells (14) and (15), and the load efficiency was calculated by the formula: (load / operated load) × 100.

The stick-slip ratio was measured in the same manner after the load efficiency was measured, and the operation was performed in the same manner. The load was temporarily stopped with a load of 200 kgf applied, and the lever (12) was pulled again to reduce the static operation load at the applied load. The difference between the dynamic operation loads was read and calculated by the formula: {(static operation load-dynamic operation load) / load} x 100.

Examples 2 to 7 and Comparative Examples 1 to 3 A control cable was prepared in the same manner as in Example 1 except that a lubricant having a composition shown in Table 1 was used. It measured similarly. The results are shown in Table 1.

Example 8 The kinematic viscosity at 25 ° C. was 20,000 cSt, and 3- (N−
Amine-modified organopolysiloxane containing 2 mol% of aminoethyl) aminopropyl groups and other amino groups being methyl groups and having straight-chain amino groups directly bonded to silicon atoms via at least one carbon atom The oil (hereinafter, referred to as amine-modified organopolysiloxane oil B) itself was used as the lubricant.

Next, a control cable was prepared in the same manner as in Example 1 except that the lubricant obtained above was used, and its load efficiency and stick-slip ratio were measured in the same manner as in Example 1. The results are shown in Table 1.

Examples 9 and 10 and Comparative Examples 4 and 5 After the materials having the compositions shown in Table 1 were uniformly mixed at room temperature, the mixture was treated three times with a roll mill to prepare a grease-like lubricant.

A control cable was prepared in the same manner as in Example 1 except that this lubricant was used, and the load efficiency and the stick-slip ratio of each were measured in the same manner as in Example 1. The results are shown in Table 1.

In addition, for reference, the mixing penetration of the obtained grease-like lubricant was measured. The results are shown in Table 1.

Example 11 A control cable was obtained in the same manner as in Example 2 except that nylon-6,6 was used as the inner cable covering material and the liner material. The stick-slip ratio and the load efficiency of the obtained control cable were measured in the same manner as in Example 2. The results are shown in Table 1.

Comparative Example 6 A control cable was obtained in the same manner as in Comparative Example 1 except that nylon-6,6 was used as the inner cable covering material and the liner material. Comparative Example 1 of stick-slip ratio and load efficiency of obtained control cable
The measurement was performed in the same manner as described above. The results are shown in Table 1.

Example 12 In Example 2, nylon-6,6 was used as the inner cable covering material.
And a control cable was obtained in the same manner as in Example 2 except that no liner material was used. The stick-slip ratio and the load efficiency of the obtained control cable were measured in the same manner as in Example 2. The results are shown in Table 1.

Comparative Example 7 A control cable was obtained in the same manner as in Comparative Example 1 except that nylon-6,6 was used as the inner cable covering material and no liner material was used. The stick-slip ratio and the load efficiency of the obtained control cable were measured in the same manner as in Comparative Example 1. The results are shown in Table 1.

Example 13 A control cable was obtained in the same manner as in Example 2 except that the inner cable was not used and the polybutylene terephthalate was used as the liner material. The stick-slip ratio and the load efficiency of the obtained control cable were measured in the same manner as in Example 2. The results are shown in Table 1.

Comparative Example 8 A control cable was obtained in the same manner as in Comparative Example 1 except that the inner cable covering material was not used and polybutylene terephthalate was used as the liner material. The stick-slip ratio and the load efficiency of the obtained control cable were measured in the same manner as in Comparative Example 1. The results are shown in Table 1.

As is clear from the results shown in Table 1, Examples 1 to
It can be seen that the control cable of the present invention obtained in FIG. 13 has an extremely low stick-slip ratio and excellent load efficiency.

[Effects of the Invention] The control cable of the present invention has a lower stick-slip ratio than a conventional cable, and has a superior load efficiency effect.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view showing one embodiment of the control cable of the present invention, and FIG. 2 is an explanatory diagram of a measuring device for measuring the performance of the control cable of the present invention. (Main symbols in the drawings) (1): Inner cable (2): Conduit (3): Synthetic resin coating (4): Liner

──────────────────────────────────────────────────の Continuation of the front page (51) Int.Cl. ⁶ Identification symbol FI C10N 40:32 50:10 (56) References JP-A-54-49460 (JP, A) JP-A-59-189167 (JP, A) JP-A-60-231009 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) C10M 107/50 F16C 1/24 F16C 1/20 F16C 1/26 C10N 40:32

Claims (5)

(57) [Claims] An organopolysiloxane having an amine-modified organopolysiloxane oil in which an amino group is directly bonded to a silicon atom via at least one carbon atom and having a kinematic viscosity at 25 ° C of 25 to 150,000 cSt. A lubricant for control cables comprising a siloxane oil-based lubricating oil or a grease containing the lubricating oil as a main component. 2. A control cable comprising a flexible conduit and an inner cable slidably inserted into the conduit, wherein the organopolysiloxane-based lubricating oil or the lubricating oil according to claim 1. A control cable, characterized in that grease mainly composed of: is interposed between the inner cable and the conduit. 3. The control cable according to claim 2, wherein said control cable is provided with a synthetic resin coating on an outer peripheral surface of an inner cable. 4. The control cable according to claim 2, wherein a liner made of synthetic resin is provided over the entire area of the conduit of the control cable. 5. The control cable according to claim 2, wherein a liner made of synthetic resin is attached to the entire area inside the conduit, and a synthetic resin coating is applied to an outer peripheral surface of the inner cable.