JP2005240859A - Disk brake gear and industrial vehicle equipped with same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a disk brake device enabling simple adjustment with fewer labor. <P>SOLUTION: A disk brake device braking by clamping a disk rotor by a pair of arms provided with a friction pad, is provided with a base supporting at least one of arm of the both arms relatively swingably in relation to another arm, an energizing mechanism energizing the both arms in a direction to clamp the disk rotor and a lever abutted on the disk rotor side of both arms and swingably supported by the base and swinging and pressing both arms against energizing force of the energizing mechanism. The lever is connected to a brake operation mechanism for operating the disk brake device and is swung by drive of the brake operation mechanism. A roller is rotatably supported at a contact part of the lever with both arms. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a disc brake device and an industrial vehicle such as a reach type forklift provided with the disc brake device.

  Conventionally, a disc brake device has been adopted as one of brake devices for industrial vehicles. For example, a disc brake device used for a travel motor provided in a vertical position includes a disc rotor fixed to a rotation shaft of the travel motor, A base fixed to the casing of the traveling motor, a pair of upper and lower arms supported by the base so as to be swingable in the vertical direction, swinging and contacting / separating from the upper and lower surfaces of the disk rotor, and both arms Urging means such as a spring that urges the disk rotor to come into contact with the disk rotor, and drive means such as a lever that swings both arms against the urging force of the urging means and separates them from the disk rotor. ing.

  In such a disc brake device, for example, as shown in Patent Document 1 below, a cam is provided on the lever, and an adjustment bolt is screwed to each arm at a position where it comes into contact with the cam. When the cam in contact with the adjusting bolt rotates, the disc brake device is brought into a non-braking state by being separated from the disc rotor so that both arms are pushed and spread, so the positional relationship between the cam and the adjusting bolt is By adjusting, the movement of the lever and the movement of both arms can be adjusted.

  In the disc brake device described in Patent Document 2 below, the lever can be operated by, for example, a brake pedal provided in the driver's seat, and the lever and the brake pedal are connected via a link mechanism, The pedal operating force is transmitted to the lever.

JP-A-2-163526 JP 2002-255497 A

  When installing a disc brake device equipped with a cam and an adjusting bolt as described above, adjust the cam direction and the position of the adjusting bolt so that the disc rotor is securely clamped during braking. The movement of the arm is adjusted to ensure that the rotor is released, but this has the problem that it is very time-consuming. In addition, since the position of the base that supports the arm is adjusted using, for example, a shim or the like, there is a problem that this work is very laborious.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a disc brake device that can be easily adjusted with less effort. An object is to provide an equipped industrial vehicle.

  In order to achieve the above object, the first aspect of the present invention is a disc brake device that applies a brake by sandwiching a disc rotor fixed to a rotating body to be braked by a pair of arms provided with friction pads. A base that supports at least one of the arms so as to be able to swing relative to the other arm, a biasing mechanism that biases the arms in a direction to sandwich the disk rotor, and the arms. And a lever that is pivotally supported by the base and swings against the urging force of the urging mechanism. , Connected to a brake operation mechanism for operating the disc brake device, and is driven to swing by the brake operation mechanism. Are each rollably rollers supported on the contact portion of the arm, the roller is provided adjustably position the swing direction of the lever, adopting the technical means of.

  According to this, since the movement of both arms can be adjusted only by adjusting the positions of both rollers, the adjustment can be easily performed as compared with the case of adjusting with the cam and the adjusting bolt. Moreover, since both rollers move while rolling along the disk rotor side of both arms when the lever swings, smooth movement of both arms can be realized, and slip between the rollers and the arms can be realized. In other words, an excessively large force is not required to drive the lever so that the disk rotor is released. As a result, the force for driving the lever by the brake operation mechanism is small, and the disc brake device operates more efficiently.

  In order to achieve the above object, the second aspect of the present invention is a disc brake device that applies a brake by sandwiching a disc rotor fixed to a rotating body to be braked by a pair of arms provided with friction pads. A base that supports at least one of the arms so as to be able to swing relative to the other arm, a biasing mechanism that biases the arms in a direction to sandwich the disk rotor, and the arms. One of the arms is abutted against the disk rotor side and supported by the other arm so as to be swingable, and swings and presses the one arm against the biasing force of the biasing mechanism. And the lever is connected to a brake operation mechanism for operating the disc brake device, and is driven to swing by the brake operation mechanism. Ri, of the lever, rollably roller contact portion between one arm above is supported, the roller is provided adjustably position the swing direction of the lever, adopting the technical means of.

  According to this, since the movement of the arm can be adjusted only by adjusting the position of one roller, the adjustment can be easily performed as compared with the case of adjusting with the cam and the adjusting bolt. Further, since the structure is simplified, the assembly work of the disc brake device is simplified, and the labor required for the work is reduced. In addition, since the roller moves while rolling along the disk rotor side of the arm when the lever swings, smooth movement of the arm can be realized, and slippage between the roller and the arm can be suppressed. Thus, an excessively large force is not required to drive the lever so that the disc rotor is released. As a result, the force for driving the lever by the brake operation mechanism is small, and the disc brake device operates more efficiently.

  In the second aspect of the invention, the base extends along the arm on the side that comes into contact with the roller of the two arms, and the arm on the side that comes into contact with the roller is received by the base from below. It can be set as the structure in which a receiving part is provided.

  According to such a configuration, when the lever presses the arm on the side in contact with the roller via the roller so as to swing away from the disk rotor, the arm is received by the receiving portion provided on the base. The lever swings with the arm supporting the lever in a direction away from the disk rotor (in a direction opposite to the direction away from the disk rotor of the arm on the side in contact with the roller). As a result, both arms can be reliably separated from the disc rotor to release the disc rotor, and the disc brake device can be brought into a non-braking state.

  In the first and second aspects of the invention, the lever is provided with a shaft body rotatably supported by the base or the arm, and a brake operation mechanism connected to the shaft body and driving the lever. A lever member that is connected and can swing around a rotation axis of the shaft body; and a support member that is coupled to the shaft body and supports the roller in a rollable manner. A plurality of teeth are formed at predetermined intervals in the circumferential direction, and the lever member or the support member is provided with a hole in which a tooth groove engaged with the teeth is formed on the inner periphery, and the shaft body Is inserted into the hole, the teeth are meshed with the tooth gap, and the shaft body and the lever member or the support member are connected.

  According to such a configuration, the relative meshing relationship between the teeth formed on the outer periphery of the shaft body and the tooth grooves formed on the inner periphery of the hole provided in the lever member or the support member is appropriately selected. Thus, the positional relationship between the lever member and the roller and the position of the roller with respect to the arm can be easily adjusted. That is, by changing the meshing relationship between the teeth and the tooth gap between the shaft body and the lever member, the positional relationship between the support member and the lever member connected to the shaft body, and by extension, the support member is supported. Since the positional relationship between the roller and the lever member is changed, the position of the roller can be adjusted. Further, by changing the meshing relationship between the teeth and the tooth gap between the shaft body and the support member, the positional relationship between the lever member connected to the shaft body and the support member, and thus the lever member, Since the positional relationship with the roller supported by the support member is changed, the position of the roller can be adjusted. Here, since the teeth and the tooth gap are formed around the rotation axis of the shaft body, the roller moves around the rotation axis of the shaft body in the same manner as the lever member swinging direction, that is, the lever swinging direction. The position will be adjusted. Of course, since it is connected by the engagement of the teeth of the shaft body and the tooth groove of the hole, the changed state can be reliably maintained even if the relative engagement relationship is changed. Note that the shaft and the lever member, or the shaft and the support member may be connected by engagement of the teeth and the tooth gap, or both.

  By the way, in the first and second inventions, as a brake operation mechanism connected to the lever (lever member), a link mechanism is used that links the lever (lever member) and an operation tool such as a brake pedal operated by the driver. It is also possible to employ one that is mechanically connected via a wire cable. When a flexible connecting member such as a wire cable is used, the connecting member can be supported by the vehicle body, or can be configured to be supported by the base or the arm. When the connecting member is thus supported by the base or the arm, the positional relationship between the connecting member and the lever (lever member) to which the connecting member is connected can be maintained.

  In order to achieve the above object, an industrial vehicle according to the third aspect of the invention uses the disc brake device according to the first and second aspects of the invention with the rotating body to which the disc rotor is fixed as the rotation shaft of the traveling motor. The technical means of providing a travel motor for driving a drive wheel provided in the vehicle body is employed.

  According to this, since the labor required for adjusting the disc brake device in the industrial vehicle is reduced, the work load and cost relating to maintenance are reduced, and the safety of the vehicle is improved. In particular, for industrial vehicles such as forklifts, where the vehicle is frequently started and stopped for work, and frequently used for braking of the vehicle, such as switching between forward and reverse, and getting on and off the driver, The burden on the brake device is large, and it is necessary to check and adjust the disc brake device frequently, so that the effect obtained is great.

  According to the first and second aspects of the invention, the movement of the arm can be adjusted only by adjusting the position of the roller, so that the adjustment can be easily performed as compared with the case of adjusting with the cam and the adjusting bolt. . In addition, since the roller moves while rolling along the arm when the lever swings, slippage between the roller and the arm is suppressed, and an extra large force is not required to drive the lever. As a result, the brake operation force is reduced.

  According to the third aspect of the present invention, the work load and cost related to the maintenance of the disc brake device are reduced, so that the maintainability and safety of the industrial vehicle can be improved.

  Hereinafter, an embodiment in which the present invention is applied to a reach-type forklift that is a kind of industrial vehicle will be described with reference to the drawings.

  As shown in FIG. 3, the reach forklift according to the first embodiment of the present invention has left and right reach legs 2 projecting forward from the vehicle body frame 1, and the cargo handling device 6 can be moved forward and backward on both reach legs 2. It is supported by. A road wheel 3 is supported at the front end of the reach leg 2, a drive wheel 4 is supported at the left rear part of the body frame 1, and a caster wheel 5 is supported at the right rear part of the body frame 1, Travel with these wheels. The drive wheel 4 is supported by a gear housing 7 provided on the vehicle body frame 1 so as to be pivotable about a longitudinal axis, and a driving force is transmitted to the upper portion of the gear housing 7 via a gear provided in the gear housing 7. A travel motor 8 for rotating the drive wheel 4 is provided. A rotary shaft 9 of the travel motor 8 is protruded upward, and a disc rotor 11 of the disc brake device 10 according to the present embodiment is horizontally fixed to the rotary shaft 9.

  As shown in FIGS. 1 and 2, the disc brake device 10 includes a disc rotor 11 and friction pads that are brought into contact with and separated from upper and lower surfaces of the disc rotor 11 (hereinafter referred to as braking surfaces if necessary). A pair of upper and lower arms 13 a and 13 b (hereinafter, abbreviated as “arm 13” if necessary) provided with 12, a base 14 attached to the upper surface of the travel motor 8 and holding both arms 13, A biasing mechanism 15 that biases both arms 13 with a predetermined biasing force in a direction in which the disk rotor 11 is sandwiched, that is, a direction in which the friction pad 12 contacts the disk rotor 11, and a biasing force of the biasing mechanism 15 in both arms 13 And a lever 16 that pushes and opens the friction pad 12 against the disk rotor 11.

  A bearing piece 18 to which a pin 17 that pivotally supports both arms 13 is attached is formed at the front end of the base 14 so as to rise upward, and the pin is inserted into a mounting hole provided at the front end of both arms 13. 17 is inserted and both arms 13 are supported by the base 14 and can swing up and down around the pin 17. Friction pads 12 are fixed to the surfaces of the arms 13 facing the disk rotor 11, and the arms 13 swing so that the friction pads 12 come into contact with and separate from the upper and lower braking surfaces of the disk rotor 11. It is supposed to be. A bearing piece 24 to which a shaft 25 of a lever 16 (to be described later) is attached is formed at the rear end of the base 14 so as to rise upward. The shaft 25 is attached to the bearing piece 24. It is supported by the hole and can rotate about the axis. Here, in the base 14, the mounting holes to which the pins 17 and the shaft 25 are attached are formed at the same height from the lower surface of the base 14, and the pins 14 and the shaft 25 are connected to the disk rotor 11. It is attached to the traveling motor 8 so as to be located at the same height.

  The urging mechanism 15 is received by a headed bolt 19 inserted vertically into both arms 13, a spring seat 20 received on the upper surface of the upper arm 13 a, and a nut 21 screwed to the headed bolt 19. And a coil spring 23 provided between the spring receiving seat 20 and the spring holding seat 22 in a state of being inserted into the headed bolt 19. Then, when the coil spring 23 is compressed and attached to a preset length, both arms 13 come close to each other by the elastic restoring force of the coil spring 23 and are biased in a direction to sandwich the disk rotor 11.

  The lever 16 is supported by the shaft 25 supported by the base 14, a lever member 26 coupled to one end side of the shaft 25, a roller support member 27 coupled to the other end side, and the roller support member 27. A pair of rollers 28a and 28b (hereinafter abbreviated as "roller 28" as needed). The roller 28a abuts the lower surface of the upper arm 13a in front of the shaft 25, and is rearward of the shaft 25. The roller 28b is attached in contact with the upper surface of the lower arm 13b. The lever 16 as a whole can swing back and forth around the axis of the shaft 25. By swinging backward, both arms 13 swing away from the disk rotor 11 and swing forward. By moving, both arms 13 swing in a direction to contact the disk rotor 11.

  As shown in FIG. 4, the shaft 25 has a pivot portion 29 that is rotatably fitted in the bearing piece 24 of the base 14, and a left side of the bearing piece 24 with the pivot portion 29 fitted in the bearing piece 24. A spline shaft portion 30 that externally fits the lever member 26 and a screw shaft portion 31 that protrudes further to the left from the left end of the spline shaft portion 30 is provided. The lever member 26 is connected to the left end side of the roller, and the roller support member 27 is connected to the right end side.

  As shown in FIG. 4, the lever member 26 has a spline hole 32 that engages with the spline shaft portion 30 of the shaft 25 at the base end portion, and a brake operation mechanism 40 (not shown in FIG. 4) that will be described later at the distal end portion. ) Are connected to each other. The lever member 26 is connected to the shaft 25 by the nut 36 being screwed onto the screw shaft portion 31 with the plain washer 34 and the spring washer 35 sandwiched between the spline shaft portion 30 and the spline hole 32 engaged. Fixed. When the spline shaft portion 30 and the spline hole 32 are engaged with each other, the lever member 26 is positioned at a predetermined position, for example, an upright position where the distal end portion is directly above the base end portion, and the urging mechanism 15 causes friction. In a state where the pad 12 is pressed against the disk rotor 11, the meshing relationship of the shaft 25 with the lever member 26 is selected so that each roller 28 comes into contact with each arm 13 or approaches within a predetermined range.

  The roller support member 27 is formed so as to protrude from the support bar 27a to the opposite side of the shaft 25, that is, to the right at a symmetrical position with respect to the shaft 25. A roller 28 formed of a pair of support shafts 27b and formed in a cylindrical shape with a uniform thickness is fitted on each support shaft 27b so as to be able to roll. At this time, the retaining ring 38 is fitted into the circumferential groove 37 formed at the tip (right end) of each support shaft 27b, so that the roller 28 is removed from the support shaft 27b without preventing the roller 28 from rolling. Is prevented. The shaft 25 and the roller support member 27 may be connected and fixed by screwing or welding a support bar 27a to the right end of the pivot portion 29.

  As shown in FIGS. 5 and 6, the brake operation mechanism 40 includes a brake pedal 41, a pull rod 42, a crank lever device 43, and a push rod 44. The brake pedal 41 is disposed at the left front corner on the floor 45 provided at the right rear portion of the vehicle body frame 1, and is vertically moved around the left and right axial centers via a support shaft device 47 on a support frame 46 provided on the left side of the floor 45. It is supported so that it can swing. The pull rod 42 has a lower end connected to the middle portion of the brake pedal 41 and an upper end connected to the tip of the horizontal arm 43 a of the crank lever device 43. The crank lever device 43 has a shaft 43c that is supported by the body frame 1 via a left and right bearing 43b so as to be rotatable around a left and right axis, and a base end portion of the shaft 43c between the support frame 46 and the floor 45. A fixed horizontal arm 43a and a vertical arm 43d having a base end fixed to a shaft 43c in front of the lever member 26 are provided. The push rod 44 has a front end connected to the tip of the vertical arm 43 d and a rear end connected to the round hole 33 in the tip of the lever member 26. The push rod 44 is configured to be capable of adjusting the axial length, that is, the length from the connecting portion with the vertical arm 43d to the connecting portion with the lever member 26, and the brake pedal 41 is adjusted by adjusting the axial length. You can adjust the tread.

  Now, in a state where the brake pedal 41 is not operated (that is, in a brake operating state), the lever member 26 is urged in a direction that tilts forward and backward due to the weight of the brake operating mechanism 40, and the roller 28 is moved to the operating position (friction pad). 12 is received at a position where it contacts the arm 13 at a position where it contacts the braking surface of the disk rotor 11. When the brake pedal 41 is depressed, the lever member 26 is pushed backward against the urging force of the urging mechanism 15 by the depressing force, and the roller 28 pushes and opens the arm 13 so that the friction pad 12 is separated from the disk rotor 11. . In other words, the brake operating mechanism 40 is of a type that releases the disc rotor 11 to a non-braking state by pushing the lever 16 (lever member 26) backward (hereinafter referred to as “brake release” as necessary). It is.

  As wear of the friction pad 12 progresses, the distance between the rear end portions of the arms 13 gradually decreases in the brake operating state, the lever member 26 tilts forward, and the brake pedal 41 rises. Therefore, when the wear of the friction pad 12 has progressed to a predetermined amount or periodically, the lever member 26 is once disassembled from the spline shaft portion 30, and the spline hole 32 is shifted in the backward tilting direction, for example, by one ridge. By reassembling to 30, the roller 28 is moved in such a direction as to widen the distance between both arms 13, and the position of the lever member 26 in the brake operating state is corrected from the forward tilted position to the upright position. As a result, the brake pedal 41 can be returned to its original position and the brake can be reliably released.

  Thus, in the disc brake device 10 according to the first embodiment, the movement of the arm 13 can be adjusted only by adjusting the position of the roller 28 by changing the meshing relationship between the spline shaft portion 30 and the spline hole 32. Thus, the adjustment can be easily performed as compared with the case of adjusting with the cam and the adjusting bolt. Further, since both rollers 28 move while rolling along the disk rotor 11 side of both arms 13 when the lever 16 swings, the slip between the roller 28 and the arm 13 is suppressed, and the disk rotor. No extra force is required to drive the lever 16 so that 11 is released. As a result, the force for driving the lever 16 by the brake operation mechanism 40 is small, and the disc brake device 10 operates more efficiently. That is, since the pedaling force applied to the brake pedal 41 is small when releasing the brake, the fatigue of the driver who operates this reach type forklift is reduced.

  In the disk brake device 10 of this embodiment, the meshing relationship between the spline shaft portion 30 of the shaft 25 and the spline hole 32 of the lever member 26 in the first embodiment is different. That is, as shown in FIG. 7, the lever member 26 is positioned at a predetermined angle (here, the upright position where the distal end 34 is directly above the proximal end 33), and the urging mechanism 15 causes the friction pad 12 to move to the disk rotor. 11, the lower roller 28 a is in contact with the lower arm 13 b in front of the shaft 25, and the upper roller 28 b is in contact with the upper arm 13 a behind the shaft 25. The spline shaft part 30 and the spline hole 32 are meshed so as to contact each other.

  In addition, a brake operation mechanism 50 is connected to the disc brake device 10 of this embodiment instead of the brake operation mechanism 40 including the crank lever device 43 and the push rod 44 in the first embodiment. As shown in FIGS. 7 and 8, the terminal member of the brake operation mechanism 50 connected to the lever member 26 includes a cable 52 protected by an outer cable 51, and the terminal portion of the outer cable 51 is a support member 53. It fixes to the body frame 1 side via. Although not shown in FIGS. 7 and 8, the other end of the cable 52 is supported by a support frame 46 provided on the left side of the floor 45 at the right rear portion of the vehicle body frame 1 so as to be swingable up and down. When the brake pedal 41 is depressed, the lever 16 (lever member 26) is pulled forward as shown in FIG.

  In this manner, the disc brake device 10 according to the present invention can be made to correspond to a brake operation mechanism 50 of a type that releases the brake by pulling the lever 16 (lever member 26) forward. The other configurations, operations, and effects of the second embodiment are the same as those of the first embodiment.

  As shown in FIGS. 9 and 10, the disc brake device 10 of this embodiment is different from that of the second embodiment in that the support member 53 is fixed to the upper arm 13a. Thereby, even if the traveling motor 8 moves up and down during traveling, the terminal of the outer cable 51 moves up and down following the traveling motor 8 together with the arm 13a, and a bending force acts on the cable 52. This can be prevented. The other configurations, operations, and effects of the third embodiment are the same as those of the second embodiment.

  The main configuration of the reach type forklift according to the fourth embodiment of the present invention is the same as that of the first embodiment, and the cargo handling device 6 is supported by the reach leg 2 provided on the vehicle body frame 1 so as to be able to move forward and backward. A road wheel 3 is rotatably supported at the front end of the vehicle body 2, a drive wheel 4 is supported at the left rear portion of the vehicle body frame 1, and a caster wheel 5 is rotatably supported at the right rear portion of the vehicle body frame 1. The drive wheel 4 is provided on the vehicle body frame 1 together with a gear housing 7 that supports the drive wheel 4 so as to be pivotable about the longitudinal axis, and a traveling motor 8 is provided on the upper portion of the gear housing 7. Then, the disc rotor 11 of the disc brake device 10 according to the fourth embodiment is horizontally fixed to the rotating shaft 9 protruding upward from the traveling motor 8.

  As shown in FIGS. 11 and 12, the disc brake device 10 includes a disc rotor 11 and friction pads that are brought into contact with and separated from upper and lower surfaces of the disc rotor 11 (hereinafter referred to as braking surfaces if necessary). A pair of upper and lower arms 13 a and 13 b (hereinafter, abbreviated as “arm 13” if necessary) provided with 12, a base 14 attached to the upper surface of the travel motor 8 and holding both arms 13, An urging mechanism 15 that urges both arms 13 in a direction to sandwich the disk rotor 11, and both arms 13 are pushed open against the urging force of the urging mechanism 15 to separate the friction pad 12 from the disk rotor 11. The lever 16 is provided.

  A bearing piece 18 to which a pin 17 that pivotally supports both arms 13 is attached is formed at the front end of the base 14 so as to rise upward, and the pin is inserted into a mounting hole provided at the front end of both arms 13. 17 is inserted and both arms 13 are supported by the base 14 and can swing up and down around the pin 17. Friction pads 12 are fixed to the surfaces of the arms 13 facing the disk rotor 11, and the arms 13 swing so that the friction pads 12 come into contact with and separate from the upper and lower braking surfaces of the disk rotor 11. It is supposed to be. Further, a bearing piece 24 to which a shaft 25 of the lever 16 described later is attached is formed at the rear end portion of the upper arm 13a so as to rise downward, and the shaft 25 is provided on the bearing piece 24. It is supported by the mounting hole and can rotate about the axis.

  FIG. 13 is an enlarged side view of the portion A in FIG. 12, and as shown in FIG. 13, the portion of the base 14 that extends along the lower arm 13b to the lower side of the lower arm 13b. On the upper surface, a receiving portion 54 formed of a protrusion for receiving the lower arm 13b is formed. As a result, when the lever 16 presses the lower arm 13b away from the disk rotor 11 via a roller 28, which will be described later, that is, swings downward, the lower arm 13b is received by the receiving portion 54. Since the lever 16 swings together with the upper arm 13a away from the disk rotor 11, that is, swings upward, the upper and lower friction pads 12 are reliably separated from the disk rotor 11 when the brake is released.

  The urging mechanism 15 is received by a headed bolt 19 inserted vertically into both arms 13, a spring seat 20 received on the upper surface of the upper arm 13 a, and a nut 21 screwed to the headed bolt 19. And a coil spring 23 provided between the spring receiving seat 20 and the spring holding seat 22 in a state of being inserted into the headed bolt 19. Then, when the coil spring 23 is compressed and attached to a preset length, both arms 13 come close to each other by the elastic restoring force of the coil spring 23 and are biased in a direction to sandwich the disk rotor 11.

  The lever 16 includes a shaft 25 supported by the upper arm 13a, a lever member 26 connected to one end of the shaft 25, a roller support member 27 connected to the other end, and the roller support member 27 The roller 28 is supported by the tip, and the roller 28 is attached in contact with the upper surface of the lower arm 13b. The lever 16 as a whole can swing back and forth around the axis of the shaft 25. By swinging forward, both arms 13 swing away from the disk rotor 11 and swing backward. By moving, both arms 13 swing in a direction to contact the disk rotor 11.

  The shaft 25 is formed so as to protrude to the left of the bearing piece 24 in a state in which the pivot 29 is fitted in the bearing piece 24 so as to be rotatably fitted in the bearing piece 24 of the upper arm 13a. In addition, a spline shaft portion 30 for externally fitting the lever member 26 and a screw shaft portion 31 formed so as to protrude further leftward from the left end of the spline shaft portion 30 are provided. The member 26 is connected, and the roller support member 27 is connected to the right end side.

  As shown in FIG. 14, the lever member 26 is formed with a spline hole 32 that engages with the spline shaft portion 30 of the shaft 25 at the base end portion, and a round portion that is connected to a brake operation mechanism 50 described later at the tip end portion. A hole 33 is formed. The lever member 26 is connected to the shaft 25 by the nut 36 being screwed onto the screw shaft portion 31 with the plain washer 34 and the spring washer 35 sandwiched between the spline shaft portion 30 and the spline hole 32 engaged. Fixed. When the spline shaft portion 30 and the spline hole 32 are engaged with each other, the lever member 26 is positioned at a predetermined position, for example, an upright position where the distal end portion is directly above the base end portion, and the urging mechanism 15 causes friction. In a state where the pad 12 is pressed against the disk rotor 11, the meshing relationship of the shaft 25 with the lever member 26 is selected so that each roller 28 comes into contact with each arm 13 or approaches within a predetermined range.

  The roller support member 27 is formed so as to protrude linearly from the other end of the support bar 27a to the opposite side of the shaft 25, that is, to the right. A roller 28 formed of a support shaft 27b and formed in a cylindrical shape with a uniform thickness is fitted on the support shaft 27b so as to be able to roll. At this time, the retaining ring 38 is fitted into the circumferential groove 37 formed at the tip (right end) of the support shaft 27b, thereby preventing the roller 28 from falling off the support shaft 27b without preventing the roller 28 from rolling. Is done. The shaft 25 and the roller support member 27 are screwed or welded to the right end of the pivot portion 29 at the other end of the support bar 27a (the end opposite to the side where the support shaft 27b is provided). It may be connected and fixed by doing.

  The brake operation mechanism 50 includes a brake pedal 41 and a cable 52 protected by an outer cable 51, and a terminal portion of the outer cable 51 is fixed to an upper arm 13 a of the disc brake device 10 via a support member 53. The As in the first embodiment, the brake pedal 41 is disposed at the left front corner on the floor 45 provided at the right rear portion of the body frame 1, and the support frame 46 provided on the left side of the floor 45 via the support shaft device 47. Thus, it is supported so that it can swing up and down around the left and right axis. The cable 52 has one end connected to the brake pedal 41 and the other end connected to the round hole 33 at the tip of the lever member 26.

  Now, in a state where the brake pedal 41 is not operated (that is, in a brake operating state), the lever member 26 is urged in the direction of falling forward from the rear due to the weight of the brake pedal 41, and the roller 28 is moved to the operating position (friction). The pad 12 is received by the urging force of the urging mechanism 15 at a position where the pad 12 contacts the arm 13 at a position where the pad 12 contacts the braking surface of the disk rotor 11. When the brake pedal 41 is depressed, the lever member 26 is pulled forward against the urging force of the urging mechanism 15 by the depressing force, and the roller 28 pushes and opens the arm 13 so that the friction pad 12 is separated from the disk rotor 11. To do. That is, the brake operation mechanism 50 is of a type that releases the brake by pulling the lever 16 (lever member 26) forward.

  As wear of the friction pad 12 progresses, the distance between the rear ends of both arms 13 gradually decreases in the brake operating state, the lever member 26 tilts backward from the upright position, and the brake pedal 41 rises. Therefore, when the wear of the friction pad 12 has progressed to a predetermined amount or periodically, the lever member 26 is once disassembled from the spline shaft portion 30, and the spline hole 32 is shifted by, for example, one mountain in the forward tilting direction. By reassembling to 30, the roller 28 is moved in such a direction as to widen the distance between both arms 13, and the position of the lever member 26 in the brake operating state is corrected from the backward tilted position to the upright position. As a result, the brake pedal 41 can be returned to its original position and the brake can be reliably released.

  Thus, in the disc brake device 10 according to the fourth embodiment, the movement of the arm 13 can be adjusted only by adjusting the position of the roller 28 by changing the meshing relationship between the spline shaft portion 30 and the spline hole 32. Thus, the adjustment can be easily performed as compared with the case of adjusting with the cam and the adjusting bolt. Further, it is not necessary to adjust the positions of the arm 13 and the lever 16 with respect to the disk rotor 11 by, for example, shim adjustment at the time of assembly, and the assembly work is simplified. Of course, the structure is simplified as compared with the first to third embodiments, so that there is an advantage that it is easy to assemble.

  Further, since the roller 28 moves while rolling along the disk rotor side of the lower arm 13b when the lever 16 swings, the slip between the roller 28 and the lower arm 13b is suppressed, and the disk 28 No extra force is required to drive the lever 16 so that the rotor 11 is released. As a result, the force for driving the lever 16 by the brake operation mechanism 40 is small, and the disc brake device 10 operates more efficiently. That is, since the pedaling force applied to the brake pedal 41 is small when releasing the brake, the fatigue of the driver who operates this reach type forklift is reduced.

  Instead of the brake operation mechanism 50 in the fourth embodiment, a brake operation mechanism including a pull rod 42, a crank lever device 43, and a push rod 44 in addition to the brake pedal 41 as in the first embodiment. It is also possible to adopt a type in which the brake is released by pushing the lever 16 (lever member 26) backward by a brake operation mechanism. Further, as in the second embodiment, it is possible to employ a brake operation mechanism in which the support member 53 is provided on the vehicle body frame 1.

It is a side view at the time of the brake action of Example 1. It is a side view at the time of brake release of Example 1. It is a perspective view of the reach type forklift concerning the present invention. It is a disassembled perspective view of the lever in Example 1. FIG. It is a side view of the brake operation mechanism of this invention. It is a top view of the brake operation mechanism of the present invention. It is a side view at the time of the brake action of Example 2. FIG. It is a side view at the time of the brake release of Example 2. FIG. It is a side view at the time of the brake action of Example 3. It is a side view at the time of brake release of Example 3. It is a side view at the time of the brake action of Example 4. It is a side view at the time of brake release of Example 4. It is a side view which expands and shows the A section of FIG. It is a disassembled perspective view of the lever in Example 4. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Disc brake apparatus 11 Disc rotor 12 Friction pad 13 Arm 13a Upper arm 13b Lower arm 14 Base 15 Energizing mechanism 16 Lever 25 Shaft 26 Lever member 27 Roller support member 28 Roller 30 Spline shaft part 32 Spline hole 40, 50 Brake operation Mechanism 54 Receiving part

Claims (5)

In a disc brake device that applies a brake by holding a disc rotor fixed to a rotating body to be braked by a pair of arms provided with friction pads,
A base that supports at least one of the arms so as to be able to swing relative to the other arm;
An urging mechanism that urges both the arms in a direction to sandwich the disk rotor;
A lever that abuts against the disk rotor side of the both arms and is supported by the base so as to be swingable, and swings and presses the arms against the biasing force of the biasing mechanism;
The lever is connected to a brake operation mechanism for operating the disc brake device, and is driven by the brake operation mechanism to swing.
2. A disc brake device according to claim 1, wherein a roller is supported at the contact portion of the lever with the two arms so as to be able to roll, and the roller is provided so that its position can be adjusted in the swinging direction of the lever. In a disc brake device that applies a brake by holding a disc rotor fixed to a rotating body to be braked by a pair of arms provided with friction pads,
A base that supports at least one of the arms so as to be able to swing relative to the other arm;
An urging mechanism that urges both the arms in a direction to sandwich the disk rotor;
One of the arms is abutted against the disk rotor side of one of the arms and is supported by the other arm so as to be swingable. The arm is swung to resist the biasing force of the biasing mechanism. And a lever to press
The lever is connected to a brake operation mechanism for operating the disc brake device, and is driven by the brake operation mechanism to swing.
A disc brake device, wherein a roller is supported at a contact portion of the lever with the one arm so as to be able to roll, and the roller is provided so that the position of the roller can be adjusted in the swinging direction of the lever.   The base extends along an arm on the side that comes into contact with the roller among the two arms, and a receiving portion that receives the arm on the side in contact with the roller from below is provided on the base. The disc brake device according to claim 2. The lever is connected to a shaft body rotatably supported by the base or the arm, and a brake operation mechanism coupled to the shaft body and driving the lever, and swings around a rotation axis of the shaft body. A lever member that is movable, and a support member that is coupled to the shaft body and supports the roller in a rollable manner.
A plurality of teeth are formed on the outer periphery of the shaft body at predetermined intervals in the circumferential direction, and the lever member or the support member is provided with a hole formed with a tooth groove that engages with the teeth on the inner periphery. And
4. The shaft body is inserted into the hole, the teeth are meshed with the tooth gap, and the shaft body and the lever member or the support member are connected to each other. Disc brake device described in the paragraph.   The industrial vehicle provided with the disc brake device according to any one of claims 1 to 4, wherein the rotating body is a rotating shaft of a travel motor that drives a drive wheel provided in the vehicle body.

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