JP2018105330A - Clutch device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a CSC-type clutch device which can reduce an influence of the thermal deterioration of fluid in a clutch housing which is liable to be raised in a temperature.SOLUTION: This CSC-type clutch device includes at least: a master cylinder; a hydraulic cylinder arranged in a clutch housing, and having a hydraulic chamber; a bleeding member which is arranged outside the clutch housing being a clearance between the master cylinder and the hydraulic cylinder; a first hydraulic conduit part arranged between the master cylinder and the bleeding member; and a second hydraulic conduit part arranged between the bleeding member and the hydraulic cylinder. A non-mineral oil system fluid is charged in the first hydraulic conduit part, and fluid containing a trifluorochloroethylene polymer whose dynamic viscosity at a temperature of 25°C is 5 to 30 mm/s is charged in the second hydraulic conduit part and the hydraulic chamber.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a clutch device.

  As a hydraulic fluid (also referred to as fluid) used in a concentric slave cylinder (CSC) type clutch device, non-mineral oil-based fluid is usually used. The non-mineral oil-based fluid has a hygroscopic property, so that it easily absorbs moisture that has entered from a reservoir tank or a rubber hose. Therefore, even when moisture enters the pipe, generation of gas due to vaporization can be prevented. However, the boiling point of non-mineral oil-based fluid gradually decreases with moisture absorption. Even when the boiling point of the non-mineral oil type fluid is 240 ° C. or more at the time of filling, moisture absorption occurs due to use, and the boiling point of the non-mineral oil type fluid may be lower than 180 ° C. after several years. A non-mineral oil type fluid whose boiling point has been lowered by absorbing moisture may cause a clutch operation failure due to vapor. In order to prevent such defects, it is necessary to periodically replace the non-mineral oil-based fluid.

  Further, in the CSC clutch device, a hydraulic system enters the clutch housing. Therefore, the temperature of a part of the fluid contained in the clutch housing becomes high. Since non-mineral oil-based fluid deteriorates under the influence of heat, periodic replacement is also necessary from the viewpoint of preventing malfunction due to heat deterioration.

  Patent Document 1 discloses a clutch device having a movable dividing member that divides a fluid into a hydraulic line portion that stores the fluid. With this movable dividing member, even when the moisture content of the fluid is increased on the hydraulic pressure generating part side, the fluid containing moisture can be prevented from entering the clutch housing that tends to be in a high temperature environment.

JP 2010-53928 A

  With the technique described in Patent Document 1, even when the moisture content of the fluid is increased on the hydraulic pressure generating unit side, such fluid can be prevented from entering the clutch housing. However, as described above, the fluid is also deteriorated by the influence of heat. In the configuration of Patent Document 1, since the hydraulic fluid (also referred to as fluid) in the clutch housing is exposed to a high temperature, there is a concern that operation failure may occur due to thermal degradation as before. Moreover, in the structure described in patent document 1, since the movable piston is provided, the number of parts increases. Furthermore, in the configuration described in Patent Document 1, since the air bleeding bleeder plug is outside the clutch housing, the clutch fluid in the cylinder cannot be replaced, and the clutch fluid may stay.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a CSC clutch device capable of reducing the influence of thermal deterioration of fluid in a clutch housing that is likely to become high temperature.

  One embodiment of the present invention is as follows.

(1) A CSC clutch device,
A master cylinder,
A hydraulic cylinder disposed in the clutch housing and having a hydraulic chamber;
An air vent member disposed between the master cylinder and the hydraulic cylinder and outside the clutch housing;
A first hydraulic line portion disposed between the master cylinder and the air vent member;
A second hydraulic line portion disposed between the air vent member and the hydraulic cylinder;
Including at least
In the first hydraulic line, the non-mineral oil-based fluid is filled,
A clutch device in which the fluid containing the polymer of ethylene trifluoride chloride having a kinematic viscosity at 25 ° C. of 5 to 30 mm ² / s is filled in the second hydraulic line section and the hydraulic chamber.

  According to the configuration of the present invention, it is possible to provide a CSC clutch device capable of reducing the influence of the thermal deterioration of the fluid in the clutch housing that is likely to become high temperature.

It is the schematic which shows the clutch apparatus of the CSC system which concerns on this embodiment. It is an expanded sectional view of an air bleeding member.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
FIG. 1 is a schematic view of a CSC clutch device (for example, for a vehicle) according to a first embodiment of the present invention.

  As shown in FIG. 1, the clutch device of this embodiment includes a clutch mechanism 2 and a CSC hydraulic cylinder 3 (hydraulic actuator) housed in a clutch housing 1, and hydraulic fluid in the hydraulic cylinder 3. Hydraulic pressure supply means 4 for supplying pressure and executing the switching operation of the clutch mechanism 2.

  The clutch housing 1 is disposed between an engine (not shown) and a transmission, and is bolted integrally to the engine block at one end portion of the engine side that is wide open, and is integrated with the transmission case at the other end portion. Are combined. The clutch housing 1 houses a flywheel 6 (rotating body) that is fastened and supported by a crankshaft 5 (engine output shaft) that is a driving side rotating shaft.

  The clutch mechanism 2 is configured as a dry single plate type friction clutch interposed between the crankshaft 5 of the engine and the transmission input shaft 7. The clutch mechanism 2 is constituted by a CSC hydraulic cylinder 3. The operation is switched to any one of a clutch engagement state in which a power transmission path is connected from the crankshaft 5 to the transmission input shaft 7 (driven rotation shaft) and a clutch release state in which the power transmission path is disconnected. It is like that.

  Specifically, the clutch mechanism 2 includes a clutch disk 11 adjacent to the flywheel 6, a clutch cover 12 fastened to the flywheel 6 so as to store the clutch disk 11 between the flywheel 6, and the clutch disk 11. The pressure plate 13 can be opposed to the flywheel 6 with the clutch interposed therebetween, and the clutch disk 11 can be pressed to the flywheel 6 side. A diaphragm spring 14 that can be coupled, and a release hub 15 that can operate the diaphragm spring 14 on its inner peripheral side to release the clutch coupling.

  The flywheel 6 is formed in a disk shape having a larger rotational inertia than the crankshaft 5, and the rotational fluctuation of the crankshaft 5 can be suppressed by rotational energy. The flywheel 6 has an outer peripheral gear portion 6g that is driven by a starter motor when the engine is started.

  The clutch disk 11 rubs against the flywheel 6 on one surface side of the outer peripheral portion thereof, and rubs against the pressure plate 13 on the other surface side, and is splined on the transmission input shaft 7 which is a driven side rotating shaft on the inner peripheral portion thereof, for example. They are connected together in the rotational direction by fitting.

  The clutch cover 12 is fastened to the flywheel 6 by a plurality of bolts (not shown) at the outer periphery thereof, and a vent hole (not shown in the drawing) is formed between the clutch cover 12 and the flywheel 6, and the clutch disk 11 and the pressure plate The outer periphery of 13 is surrounded. Further, the clutch cover 12 is curved into a substantially U-shaped cross section at the inner peripheral portion thereof, and a circular opening 12c is formed.

  The pressure plate 13 is formed flat on one side facing the clutch disk 11, and on the other side engaged with the diaphragm spring 14, a biasing force from the diaphragm spring 14 side to the flywheel 6 side is given on the circumference of a certain radius. The ring-shaped protrusions 13p (which may be a plurality of protrusions spaced at equal intervals in the circumferential direction) are provided.

  The diaphragm spring 14 has a disc spring shape whose outer peripheral portion is largely curved toward the pressure plate 13 in a free state, and is located at a constant radial position with respect to the flywheel 6 via an annular pivot ring 18 and a clutch cover 12. In addition to being restrained, it is incorporated in the clutch cover 12 in a state where it is pressed and engaged with the pressure plate 13 in the vicinity thereof and radially outward from the restrained portion by the pivot ring 18. The diaphragm spring 14 is bent so that the clutch disk 11 is pressed against the flywheel 6 via the pressure plate 13 in a state of being assembled into the clutch cover 12.

  When the clutch is released, the diaphragm spring 14 has an inner peripheral side (a plurality of finger spring portions described later) by a CSC hydraulic cylinder 3 so that the outer peripheral side is separated from the clutch disk 11 with the pivot ring 18 as a fulcrum. It can be bent to one side in the axial direction from left to right in FIG. 1, and when the clutch is engaged, it returns to the other side in the axial direction.

  Further, the diaphragm spring 14 has a plurality of finger portions (not indicated) directed radially inward on the inner peripheral side thereof, and the plurality of finger portions are cantilevered at the respective radial outer ends, and the distal end side is It is a thin leaf spring.

  The release hub 15 includes a hub main body (not denoted by reference numeral) that is integrally attached to the distal end portion of the cylindrical piston 21 of the hydraulic cylinder 3 that is disposed coaxially with the transmission input shaft 7, and the transmission input shaft 7. And a flange portion (not shown) that also serves as a spring receiver located on the side opposite to the clutch disk 11 with respect to the diaphragm spring 14 in the direction of the rotational center axis of the flywheel 6, that is, outside the clutch cover 12. . A release bearing 19 that engages with a plurality of finger portions of the diaphragm spring 14 is provided on the flange portion of the release hub 15.

  The release hub 15 is linearly driven by a piston 21 within a certain operating stroke range, and when moving in a direction approaching the clutch disk 11, a plurality of diaphragm springs 14 that engage with a flange portion via a release bearing 19 are provided. The finger portion of the clutch is pressed against the flywheel 6 side so that the clutch coupled state of the clutch disk 11 and the flywheel 6 can be released.

  The CSC hydraulic cylinder 3 has a substantially cylindrical support tube 22 with a flange fixed coaxially to the transmission input shaft 7 in the clutch housing 1 so as to support the piston 21 so as to be slidable in the axial direction. Between the cylindrical piston 21 and the support tube 22, there is a case member 24 that defines an annular hydraulic chamber 23 to which hydraulic fluid pressure is supplied. That is, the CSC hydraulic cylinder 3 is constituted by a direct acting hydraulic cylinder that moves the cylindrical piston 21 coaxially with respect to the transmission input shaft 7.

  On the other hand, the hydraulic pressure supply means 4 for supplying the hydraulic pressure to the CSC hydraulic cylinder 3 includes a master cylinder 31 as a hydraulic pressure generator for generating the hydraulic pressure, and a CSC hydraulic pressure from the master cylinder 31. A hydraulic line portion 32 for storing hydraulic fluid (fluid) that transmits hydraulic pressure to the hydraulic pressure chamber 23 of the cylinder 3, and a master cylinder 31 in the hydraulic pressure line portion 32 and the hydraulic cylinder 3 are provided. And an air bleeding member 70. The air bleeding member 70 has an air bleed plug 72, and a hydraulic pipe line is connected to the first pipe part 32a on the master cylinder 31 side and the second pipe part 32b on the CSC hydraulic cylinder 3 side. It is provided in the hydraulic line portion 32 so as to divide the portion 32. That is, the hydraulic pressure supply means 4 includes a master cylinder 31, a first hydraulic line portion 32a disposed between the master cylinder 31 and the air bleeding member 70, an air bleeding member 70 having an air bleed plug 72, And a second hydraulic line portion 32b disposed between the air bleeding member 70 and the hydraulic cylinder 3.

  The master cylinder 31 houses a piston 42 in a cylindrical cylinder 41 with a bottom, and a rod portion of the piston 42 is generated so that a displacement corresponding to a pedaling force applied to the clutch pedal 51, that is, a clutch operating force is generated in the piston 42. 42 a is pin-coupled to a predetermined turning radius position 51 c of the clutch pedal 51. Although the detailed configuration of the master cylinder 31 is not shown, when the piston 42 returns to the right side in the drawing together with the clutch pedal 51, the hydraulic pressure generation chamber in the cylinder 41 communicates with the reservoir 43, which is a resin tank. Thus, when the piston 42 moves to the left side in the figure when the clutch pedal 51 is depressed, the fluid in the hydraulic pressure generating chamber is pressurized by the piston 42 after the communication is blocked by the piston 42. The hydraulic fluid pressure is transmitted by being pushed into the hydraulic pressure line section 32.

  The first pipe section 32a on the master cylinder 31 side of the hydraulic pipe section 32 is formed by metal clutch tubes 61 and 62 and a rubber hose 63 (first pipe member) connecting them, and the liquid pipe section 32a The second conduit portion 32b on the hydraulic cylinder 3 side of the pressure conduit portion 32 is configured by a metal clutch tube 66 and a fitting 67 (second piping member).

  Here, the rubber hose 63 forms at least a part of the first pipe portion 32a on the master cylinder 31 side, and is made of a material different from that of the metal clutch tube 66 and the fitting 67, and is made of the metal clutch tube 66. The fitting 67 is more difficult to absorb water than the rubber hose 63.

  Further, the first pipeline portion 32a on the master cylinder 31 side and the second pipeline portion 32b on the hydraulic cylinder 3 side form a continuous pipeline by the air vent member 70 that also functions as a connecting piping member. Are combined. As shown in FIG. 2, the air bleeding member 70 is a member that can block the air bleed hole portion in an airtight and liquid tight manner. An air bleed plug 72 with a rubber cap is disposed between the first pipe section 32a on the master cylinder 31 side of the hydraulic pipe section 32 and the second pipe section 32b on the hydraulic cylinder 3 side. Have. Each of the air bleed plugs 72 is screwed into an air bleed hole formed in the air bleeding member 70, and the pipe portion 32 can be released to the atmosphere side with the screw loosened, and is screwed. Thus, the air bleed hole can be closed airtight and liquid tightly.

  In FIG. 1, a plurality of compression coil springs 26 are provided at equal intervals in the circumferential direction between the flange portion of the release hub 15 and the case member 24 of the CSC hydraulic cylinder 3 so as to surround them. As described above, the bellows-shaped dust cover 27 is mounted between the case member 24 and the inner race (without a sign) of the release bearing 19 fixed to the flange portion.

In the present embodiment, the first hydraulic line portion 32a is filled with non-mineral oil-based fluid, and the second hydraulic line portion 32b and the hydraulic chamber 23 of the hydraulic cylinder 3 are filled with A fluid containing a polymer of ethylene trifluoride chloride (PCTFE) having a kinematic viscosity at 25 ° C. of 5 to 30 mm ² / s (hereinafter also referred to as PCTFE polymer) is filled. In other words, the fluid (hereinafter also referred to as the first fluid) filled in the first hydraulic line portion 32a is a non-mineral oil type fluid, and the second hydraulic line portion 32b and the hydraulic pressure The fluid (hereinafter also referred to as second fluid) filled in the hydraulic chamber 23 of the cylinder 3 contains a polymer of ethylene trifluoride chloride having a kinematic viscosity at 25 ° C. of 5 to 30 mm ² / s. .

That is, in this embodiment, a polymer of ethylene trifluoride chloride having a kinematic viscosity at 25 ° C. of 5 to 30 mm ² / s is mainly used as the second fluid. The polymer is not compatible with moisture or non-mineral oil type fluid and is stable to heat. As the first fluid, non-mineral oil-based fluid is used. The first fluid can be easily replaced due to the configuration of the clutch device.

  The PCTFE polymer generally has a structure represented by the following formula (1).

  n is an integer of 1 or more.

The average molecular weight of the PCTFE polymer is not particularly limited, but is, for example, 1000 or less. For example, when the average molecular weight of the PCTFE polymer is about 500, the PCTFE polymer has a kinematic viscosity at 25 ° C. of 5 to 15 mm ² / s, a boiling point of 250 ° C. or higher, and a pour point of −70 ° C. or lower. It is a liquid. The kinematic viscosity at 25 ° C. of the PCTFE polymer is 30 mm ² / s or less, preferably 20 mm ² / s or less, more preferably 15 mm ² / s or less. When the kinematic viscosity at 25 ° C. of the PCTFE polymer is 30 mm ² / s or less, the speed of clutch return can be adjusted to an appropriate range when the clutch is engaged / disengaged at a low temperature. When the kinematic viscosity at 25 ° C. of the PCTFE polymer is 5 mm ² / s or more, it is possible to easily suppress the deterioration of members such as evaporation and rubber cup even when the clutch becomes high temperature. The kinematic viscosity can be measured according to JIS K2283.

  As the second fluid, for example, Daifoil Co., Ltd. Daifoil TM variety # 1 can be used. Daifroyl # 1 contains a PCTEF polymer at 99.9% by mass or more.

  Since the PCTFE polymer has high thermal stability and hardly deteriorates, it is basically unnecessary to replace it. Further, since the PCTFE polymer and the non-mineral oil-based fluid are not compatible with each other, members such as a movable piston necessary for separating these fluids are unnecessary. The PCTFE polymer is chemically stable and hardly deteriorates due to heat generated in the clutch housing. Therefore, even if it is used for a long period of time, there is little or no deterioration, so malfunction is unlikely to occur. In addition, since the PCTFE polymer is not compatible with water, there is little or no moisture transferred from the first hydraulic line portion 32a to the second hydraulic fluid.

  Further, the PCTFE polymer has good lubricity and can reduce wear of a member such as a rubber cup used as a seal for the piston of the hydraulic chamber. As a result, occurrence of fluid leakage can be reduced.

  The content of the PCTFE polymer in the second fluid is, for example, 90% by mass or more, preferably 95% by mass or more, more preferably 99% by mass or more, and further preferably 99.9% by mass. It is above, Especially preferably, it is 100 mass%. The second fluid may contain additives in addition to the PCTFE polymer as long as the effects of the present invention are not hindered.

  As a non-mineral oil type fluid, what is comprised including the glycol type compound with a high boiling point is mentioned, for example. More specifically, as the non-mineral oil-based fluid, for example, a liquid composition (brake fluid) based on glycol ether, glycol, polyglycol, polyglycol ether or a boric acid ester thereof is used. it can. The content of the base is preferably 90% by mass or more, more preferably 95% by mass or more, and further preferably 99% by mass or more. The non-mineral oil-based fluid may appropriately contain additives in addition to the base.

  In the following, the present invention will be described with reference to examples. In addition, this invention is not restrict | limited by a following example.

  By preparing PCTFE having different average molecular weights and mixing them appropriately, five kinds of fluids used for evaluation were obtained. These fluids were filled in the second hydraulic line section and the hydraulic chamber of the clutch device shown in FIG. The first hydraulic line was filled with non-mineral oil-based fluid. The clutch device thus obtained is checked for operability at low temperatures (that is, whether or not the pedal return is below a specified value), and a high temperature operation test is performed to enable the specified operation of the clutch CSC and durability. It was confirmed whether there was no problem with sex. The results are shown in Table 1.

  As a result, in the clutch device using PCTFE having a low viscosity of Comparative Example 1, the liquid amount decreased in the high temperature operation test, and the high temperature operation test could not be completed.

  In Comparative Example 2, a clutch return failure occurred in the low temperature operation test. In the high-temperature endurance test, the clutch operation time became longer due to operation delay, and the endurance test was not established.

1 Clutch housing 2 Clutch mechanism 3 CSC hydraulic cylinder (hydraulic actuator)
4 Hydraulic pressure supply means 5 Crankshaft (drive side rotating shaft)
6 Flywheel 6g Gear 7 Transmission input shaft (driven side rotating shaft)
11 Clutch disc 12 Clutch cover 12c Opening 13 Pressure plate 13p Annular projection 14 Diaphragm spring 15 Release hub 18 Pivot ring 19 Release bearing 21 Piston (cylindrical piston)
22 Support tube 23 Hydraulic chamber 24 Case member 27 Dust cover 31 Master cylinder (hydraulic pressure generator)
32 Hydraulic line part 32a Pipe line part (first pipe line part)
32b Pipe line part (second pipe part)
41 Cylinder 42 Piston 42a Rod part 43 Reservoir (resin tank)
51 Clutch pedal (operation input member)
51c Predetermined turning radius position 61, 62 Clutch tube (duct forming member)
63 Rubber hose 66 Clutch tube (metal pipe forming member)
67 Fitting (Metal pipe forming member)
70 Air venting member (connecting piping member)
72 Air bleed plug

Claims (1)

A CSC clutch device,
A master cylinder,
A hydraulic cylinder disposed in the clutch housing and having a hydraulic chamber;
An air vent member disposed between the master cylinder and the hydraulic cylinder and outside the clutch housing;
A first hydraulic line portion disposed between the master cylinder and the air vent member;
A second hydraulic line portion disposed between the air vent member and the hydraulic cylinder;
Including at least
In the first hydraulic line, the non-mineral oil-based fluid is filled,
A clutch device in which the fluid containing the polymer of ethylene trifluoride chloride having a kinematic viscosity at 25 ° C. of 5 to 30 mm ² / s is filled in the second hydraulic line section and the hydraulic chamber.

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