JP4736477B2 - Locking device - Google Patents

Description

  The present invention relates to a locking device, and is particularly provided in a steering mechanism that is configured by mechanically separating a steering (steering steering wheel) side and a steered wheel side. The present invention relates to a locking device for mechanical connection.

  Conventionally, a vehicle has been provided with a variable transmission ratio steering mechanism that controls a displacement amount (steering angle) of a steered wheel with respect to a driver's steering operation (steering angle) according to a vehicle speed (for example, Patent Document 1 or Patent Document). 2). According to this variable transmission ratio steering mechanism, the steering side and the steered wheel side are mechanically separated in the same mechanism, and the steering operation is electrically detected, and an actuator or the like is detected according to the detected amount. The amount of displacement of the steered wheels is controlled using the movable mechanism.

  The variable transmission ratio steering mechanism is provided with a lock device that mechanically connects the steering side and the steered wheel side by displacing the lock arm to the lock position when an abnormality such as a power supply trouble occurs. Thereby, the displacement amount of the steered wheel with respect to the steering operation can be set to 1: 1, and the steering operation can be directly transmitted to the steered wheel. As a result, the vehicle can be quickly moved to a safe place when a failure occurs.

  At this time, the above-described lock arm is biased to the unlock position during normal vehicle travel, and is displaced to the lock position by the operation of a solenoid or the like by detecting an abnormality. However, if the state where the lock arm is urged to the unlocking position continues for a long time, the movable part of the arm displacement mechanism that displaces the lock arm sticks due to various factors, and even if an abnormality is detected, the lock arm It is assumed that the above displacement becomes impossible or smooth displacement is not made. Therefore, for example, a mechanism is provided in which the lock arm is temporarily displaced from the unlock position to the lock position when the engine is started, and the displacement operation of the lock arm is confirmed during normal use of the vehicle. As a result, the movable part is prevented from being fixed, and the operation of the lock arm is always performed stably.

JP 2004-017887 A JP 2001-48028 A

  However, in the case of the locking device described above, since the displacement operation of the lock arm is frequently checked at a predetermined frequency such as when the engine is started, sufficient durability is required for the lock arm and the arm displacement mechanism that displaces the lock arm. It was done. In particular, in view of the service life of the vehicle, etc., the operation of displacement of the lock arm is required to be guaranteed from several hundred thousand to several million operations. Therefore, a hard material having excellent wear resistance has been used for parts (particularly hinge pins) used in the locking device.

  Also, in the locking device, a part of the solenoid plunger is scraped by sliding during the displacement operation of the lock arm, metal powder is generated, and enters a movable part such as a solenoid, so-called `` biting '' or other phenomenon The advance / retreat operation may not be performed smoothly. In addition, magnetic materials or materials that become magnetized by firing at high temperatures may be magnetically attached to electromagnetic coils used in locking devices when metal powder is generated by friction. (Mainly made of stainless steel) was used. Therefore, since the materials used are limited, it is difficult to ensure durability and high lubricity.

  In addition, since the lock device described above generally has a small lock arm stroke, it has normal durability (for example, about several hundred thousand times), but a stricter durability standard (for example, high load is applied over a long period of time) , Millions of times) is set, an excessive load is applied to the lock arm and the arm displacement mechanism, and a stable displacement operation that satisfies these criteria may not be performed. In particular, there have been few attempts to provide a lubricating layer made of a non-magnetic material on at least a part of the surface of the lock arm or arm displacement mechanism used.

  In view of the above situation, an object of the present invention is to provide a lock arm that mechanically connects the steering side and the steered wheel side and a lock device that improves the durability of the arm displacement mechanism.

In order to solve the above problems, the locking device according to the present invention is “displaced between the unlocking position where the two shafts constituting the rotation transmission system are mechanically separated and the mechanically connected locking position. a locking device having a locking arm, is To設to one end of the solenoid plunger of the solenoid constituting the arm displacement mechanism for displacing the previous SL lock arm the hinge pin, and is formed on the lock arm, the solenoid body of the solenoid plunger A molybdenum lubricating layer coated with molybdenum disulfide using a polyamide-imide resin as a binder is formed on at least one surface of the pin receiving portion that comes into contact with the hinge pin in accordance with the forward / backward movement operation with respect to the arm displacement mechanism. Outside the plunger of the solenoid plunger of the solenoid that constitutes A fluorine lubrication layer in which a fluorine resin using a furan resin as a binder is coated on at least one of a surface portion and a solenoid inner sliding surface portion of the solenoid body that accommodates a part of the solenoid plunger is formed, The lubricating layer formed by combining the molybdenum lubricating layer and the fluorine lubricating layer is coated on the arm displacement mechanism .

  Here, molybdenum disulfide used for the molybdenum lubricating layer is known as a solid lubricating material, and can reduce the coefficient of friction with the object that is in contact by sliding between crystal planes. It is one of the excellent materials. On the other hand, the polyamide-imide resin is one of polymer materials having an amide group and an imide group in the main chain, and is a kind of engineering plastic having high heat resistance. A molybdenum lubricating layer is formed by coating molybdenum disulfide on a part of the surface of the lock arm or the like using this polyamideimide resin as a binder. The obtained molybdenum lubricating layer is a layer having high lubricity and wear resistance due to molybdenum disulfide and heat resistance due to polyamideimide resin.

  In addition, the technique for forming the molybdenum lubricating layer is a dipping method in which a coating object such as a lock arm is dipped in a coating solution prepared by mixing the above-described two components in a predetermined blending ratio and dried. It is possible to use a well-known layer forming technique such as a spray method in which the liquid is atomized. The molybdenum lubricating layer thus obtained has a layer thickness of 1 micrometer or more and 100 micrometers or less, preferably 5 micrometers or more and 15 micrometers or less.

  Therefore, according to the locking device of the present invention, the molybdenum lubricating layer is formed on the surface of either the lock arm or the arm displacement mechanism. As a result, it has a molybdenum lubrication layer mainly composed of molybdenum disulfide, which has excellent wear resistance and lubricity, at any position where it can move or slide during the displacement operation of the lock arm. It is possible to reduce the load on the lock arm and the arm displacement mechanism. As a result, the durability of the entire locking device can be improved. Further, the molybdenum lubrication layer made of molybdenum disulfide and polyamideimide resin is a nonmagnetic material, and the firing temperature of the polyamideimide resin is 200 ° C. or less, so the stainless steel material is nonmagnetic martensite. To austenite having magnetism. For this reason, problems due to the magnetic material described above do not occur.

  Therefore, according to the locking device of the present invention, the molybdenum lubricating layer is formed on the surface of at least one of the hinge pin installed at one end of the solenoid plunger and the pin receiving portion of the lock arm that contacts the hinge pin during the displacement operation. Has been. Here, the hinge pin and the pin receiving portion are portions that are most loaded during the displacement operation of the lock arm, and are likely to be worn. Therefore, it is possible to improve the durability of the locking device by selectively coating the portion with this molybdenum lubricating layer. Moreover, since the abrasion powder of the coating itself is soft, problems such as galling do not occur. Moreover, since it is nonmagnetic, the problem by magnetic powder does not arise.

  Here, the fluorine-based resin is composed of fluorine atoms in the molecule, such as polytetrafluoroethylene (PTFE), and has wear resistance and heat resistance due to the fluorine atoms. It is. On the other hand, the furan resin is generally produced from furfuryl alcohol and includes furfuryl alcohol and a copolymer of furfural and phenol.

  Therefore, according to the locking device of the present invention, the fluorine-based lubricating layer is formed on the surfaces of the lock arm and the arm displacement mechanism. In other words, it has a fluorine-based lubricating layer mainly composed of fluorine that is excellent in wear resistance and lubricity in either the movable or sliding part during the displacement operation of the lock arm. It is possible to reduce the load applied to the arm arm displacement mechanism. In particular, the fluorine lubrication layer made of a fluororesin and a furan resin is composed of a nonmagnetic material, and the curing temperature when curing the fluororesin and furan resin can be 200 ° C. or less. As described above, the stainless material does not become austenite.

  Therefore, according to the locking device of the present invention, the fluorine lubrication layer is provided on one of the plunger outer sliding surface portion of the solenoid plunger and the solenoid inner sliding surface portion of the solenoid body. Here, the solenoid is a solenoid plunger that is partly accommodated in the solenoid main body and moves forward and backward by electromagnetic action. For this reason, the plunger outer sliding surface portion corresponding to the outer surface of the solenoid plunger and the solenoid inner sliding surface portion that accommodates a part of the solenoid plunger and abuts against the outer sliding surface portion are portions that violently rub, and the displacement movement of the lock arm is performed. In particular, wear resistance is required. Therefore, the durability of the locking device is improved by forming such a portion by coating a fluorine lubricating layer.

  Further, the locking device according to the present invention has, in addition to the above configuration, “the locking device is provided in a steering mechanism configured by mechanically separating the steering side and the steered wheel side, It is also possible to perform "separation and connection".

  Therefore, according to the locking device of the present invention, the provision of the above-described steering mechanism improves the durability of separation and connection operation between the steering side and the steered wheel side.

  As an effect of the present invention, a molybdenum disulfide / polyamideimide resin excellent in high lubricity and wear resistance is provided on at least a part of a lock arm and an arm displacement mechanism of a lock device that mechanically connects a steering side and a steered wheel side. Alternatively, by coating a lubricating layer made of a combination of fluorine-based resin and furan-based resin, the displacement operation of the lock arm can be stabilized and the durability of the lock device can be improved.

  Hereinafter, a locking device 1 according to an embodiment of the present invention will be described with reference to FIGS. 1 to 3. Here, FIGS. 1 and 2 are sectional views showing the configuration of the locking device 1, and FIG. 3 is a perspective view showing the hinge pin 2 and the pin receiving portion 4 of the lock arm 3 in a simplified manner.

  The lock device 1 according to the present embodiment is provided in a transmission ratio variable steering mechanism known from Patent Document 1 and the like, and this transmission ratio variable steering mechanism is a housing connected to a steering (steering handle = not shown). 6, an electric motor (not shown) having a stator fixed in the housing 6, a motor shaft 5 of the motor connected to a steered wheel (not shown) via a reduction gear (not shown), and the like, A displacement amount (steering angle) of a steered wheel with respect to a steering operation (steering angle) is controlled according to a vehicle speed or the like. Specifically, the arm receiving portion 7 provided on the motor shaft 5 side, the lock arm 3 provided on the housing 6 side and supported at one end, and the lock arm 3 between the unlocking position and the locking position. An arm displacement mechanism 8 for displacement is mainly provided. Then, by displacing the lock arm 3 to the lock position, the motor shaft 5 and the housing 6 configured in a mechanically separated state are mechanically connected, and the turning angle is 1: 1 with respect to the steering angle. You can steer with. The motor shaft 5 and the housing 6 correspond to two shafts constituting a rotation transmission system.

  More specifically, the lock arm 3 is a longitudinal piece-like member having an arm locking portion 9 that can be engaged with the arm receiving portion 7 at one end and a pin receiving portion 4 at the other end, and an arm support hole. 12 is supported by an arm support shaft 10 connected to the arm 12. Thereby, the whole lock arm 3 can be rotated. Further, as shown in FIG. 3, the pin receiving portion 4 is formed by a pair of pin receiving piece portions 11a and 11b facing each other, is in contact with a hinge pin 2 to be described later, and a pin cutout portion 13a for displacing the lock arm 3 , 13b are provided. The lock arm 3 is normally biased to the locked position where the arm locking portion 9 is engaged with the arm receiving portion 7 (the state shown in FIG. 1).

  On the other hand, the arm displacement mechanism 8 displaces the lock arm 3 (arm engagement portion 9) biased to the lock position to the unlock position, and generates a driving force for releasing the engagement with the arm receiving portion 7. It is mainly configured by the generated solenoid 14 and the hinge pin 2 having a pair of pin protrusions 16 that are attached to one end of the solenoid plunger 15 of the solenoid 14 and are in contact with the pin notches 13a and 13b described above. Here, a molybdenum lubricating layer 19 coated with molybdenum disulfide 18 using the polyamideimide polymer 17 as a binder is formed over the entire surface of the hinge pin 2. In addition, the content rate of the molybdenum disulfide 18 in the molybdenum lubricating layer 19 is set to about 65% here. The content of molybdenum disulfide 18 is preferably 50% or more and 80% or less, and more preferably 60% or more and 70% or less. That is, when the content of molybdenum disulfide 18 is lower than 50%, the crystal surface is not sufficiently slid by the molybdenum disulfide 18, and good wear resistance cannot be obtained. On the other hand, when the content is 80% or more, since the content of the binder is small, the surface of the hinge pin 2 is not strongly coated, and the molybdenum lubricating layer 19 may be peeled off by use. Furthermore, the amount of molybdenum disulfide 18 used is expected to increase, and the cost for imparting wear resistance is expected to increase.

  Further, a plunger outer sliding surface portion 20 of the solenoid plunger 15 and a part of the solenoid plunger 15 are accommodated, and a furan resin 23 is bonded to each surface of the solenoid inner sliding surface portion 22 of the solenoid body 21 facing the plunger outer sliding surface portion 20. As a result, a fluorine lubricating layer 25 coated with polytetrafluoroethylene 24 (hereinafter referred to as “PTFE 24”) is formed. At this time, the content of PTFE 24 in the fluorine lubricating layer 25 is preferably 50% or more and 80% or less, and more preferably 60% or more and 70% or less. That is, when the content of PTFE 24 is lower than 50%, sufficient wear resistance and lubricity by PTFE 24 cannot be obtained. Here, each of the lubricating layers 19 and 25 is formed by immersing the hinge pin 2 or the solenoid plunger 15 to be coated in a coating solution prepared in advance and drying at a predetermined temperature. In addition, the process at the time of forming the lubricating layers 19 and 25 by such drying is performed at a relatively low temperature of 200 ° C. or less so that the stainless steel material constituting the hinge pin 2 and the solenoid plunger 15 is not austenitized. Yes. The layer thickness obtained by dipping is about 10 micrometers.

  Here, the displacement operation of the lock arm 3 by the arm displacement mechanism 8 is performed when the solenoid 14 (solenoid coil 9) of the lock device 1 is not excited by the biasing force of a spring (not shown) from the solenoid body 21 to the solenoid plunger 15. Protrudes in the advancing direction (corresponding to the arrow A in FIG. 1). As a result, the hinge pin 2 installed at one end of the solenoid plunger 15 abuts on the pin receiving portion 4 of the lock arm 3 existing on the extension line of the advance direction, and further tries to push the lock arm 3 in the advance direction. . Here, since the lock arm 3 is partly supported by the arm support shaft 10 as described above, the arm support shaft is moved by pushing the pin receiving portion 4 at the other end of the lock arm 3 in the advancing direction. With the axis 10 as an axis, the arm locking portion 9 at one end is displaced in the opposite direction (corresponding to the arrow B in FIG. 1). As a result, the arm locking portion 9 engages with the arm receiving portion 7 provided on the steering shaft 5 side. Thereby, the motor shaft 5 and the housing 6 are connected, and the steering side and the steered wheel side are mechanically connected. This is a state where the lock arm 3 is in the locked position (locked state). This locked state is normal when the vehicle is turned off, when an abnormality occurs, but the transmission ratio variable control is stopped under a predetermined condition. Presented at the time of confirming the operation of the lock arm 3 (fixing the transmission ratio to 1: 1). On the other hand, when the lock arm 3 is displaced to the unlocking position to be in the unlocked state, a predetermined electrical signal is sent from a control device (not shown) connected to the locking device 1, and a solenoid is based on this signal. When 14 is excited, the solenoid plunger 15 is attracted in a direction (corresponding to the reverse direction of the arrow A in FIG. 1) to be immersed in the solenoid main body 21, and the displacement is made.

  At this time, the entire surface of the hinge pin 2 that comes into contact with the lock arm during the displacement operation, and the plunger outer sliding surface portion 20 and the solenoid inner sliding surface portion 22 of the solenoid plunger 15 that slides in the advance direction are lubricated with excellent wear resistance. Layers 19 and 25 are provided. As a result, it is possible to suppress the possibility that the hinge pin 2 is worn away and metal powder is generated when the hinge pin 2 comes into contact with the pin receiving portion 4 of the lock arm 3. Similarly, metal powder generated when the plunger outer sliding surface portion 20 and the solenoid inner sliding surface portion 22 slide can be suppressed. Moreover, since the metal powder generated by these abrasions is made of a nonmagnetic material, it is magnetically attached to an electromagnetic coil or the like used in the lock device 1 and does not hinder the displacement operation. . In addition, the possibility of entering the sliding portion of the solenoid plunger 15 and causing a biting phenomenon is reduced. Thereby, the durability of the entire lock device 1 is improved, and the displacement operation of the lock arm 3 can be performed stably several million times or more compared with the conventional one.

  The present invention has been described with reference to preferred embodiments. However, the present invention is not limited to these embodiments, and various modifications can be made without departing from the spirit of the present invention as described below. And design changes are possible.

  In other words, in the present embodiment, the molybdenum lubricating layer 19 is formed by coating the surface of the hinge pin 2. However, the present invention is not limited to this, and the lock arm 3 side contacting the pin protrusion 16 of the hinge pin 2 is not limited thereto. The pin receiving unit 4 may be provided in the same manner. Thereby, the durability of the part is further improved. Furthermore, although the fluorine lubrication layer 25 is provided on both the plunger outer sliding surface portion 20 and the solenoid inner sliding surface portion 22, the plunger outer sliding surface portion 20 or the solenoid inner sliding surface portion 22 is provided depending on the required durability conditions. Either one may be used. Further, the portions where the molybdenum lubrication layer 19 and the fluorine lubrication layer 25 are formed can be formed at any location where the lock device 1 can move and slide.

It is sectional drawing which shows the structure of a locking device. It is sectional drawing which shows the structure of a locking device. It is a perspective view which simplifies and shows the structure of the hinge pin receiving part of a hinge pin and a lock arm.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Locking device 1 Hinge pin 3 Lock arm 4 Pin receiving part 8 Arm displacement mechanism 11a, 11b Pin receiving piece part 13a, 13b Pin notch part 14 Solenoid 15 Solenoid plunger 17 Polyamideimide polymer (polyamideimide resin)
18 Molybdenum disulfide 19 Molybdenum lubricating layer 20 Plunger outer sliding surface 22 Solenoid inner sliding surface 23 Furan resin 24 PTFE (fluororesin))
25 Fluorine lubrication layer

Claims (2)

A lock device having a lock arm that is displaced between a mechanically separated lock release position and a mechanically connected lock position, the two shafts constituting the rotation transmission system,
Before SL hinge pin is To設to one end of the solenoid plunger of the solenoid constituting the arm displacement mechanism for displacing the lock arm, and is formed on the lock arm, the hinge pin and those in accordance with the forward and backward movement with respect to the solenoid body of the solenoid plunger A molybdenum lubricating layer coated with molybdenum disulfide using a polyamideimide resin as a binder is formed on at least one surface of the pin receiving portion that comes into contact ,
A furan-based resin is bonded to at least one of the plunger outer sliding surface portion of the solenoid plunger of the solenoid constituting the arm displacement mechanism and the solenoid inner sliding surface portion of the solenoid body accommodating a part of the solenoid plunger. Fluorine lubrication layer coated with the fluorine resin used as is formed,
A locking device, wherein the arm displacement mechanism is coated with a lubricating layer in which the molybdenum lubricating layer and the fluorine lubricating layer are combined . The locking device is provided in a steering mechanism configured by mechanically separating a steering side and a steered wheel side, and separates and connects the steering side and the steered wheel side. Item 2. The locking device according to Item 1.

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