WO2006002578A1

WO2006002578A1 - Quick brake apparatus

Info

Publication number: WO2006002578A1
Application number: PCT/CN2004/001238
Authority: WO
Inventors: Shuxing Ge
Original assignee: Changzhou Create Electric Appliance Co., Ltd.
Priority date: 2004-07-02
Filing date: 2004-10-29
Publication date: 2006-01-12
Also published as: CN2717104Y

Abstract

A quick brake apparatus includes a bracket, a motor and a bearing base fixed on the bracket, and a shaft which has rotating parts and couples with the bearing base, as well as a transmission mechanism with smaller, greater pulley. Bearing and driving parts with eccentric grooves are disposed between the shaft and greater pulley. The driving part with eccentric grooves connects with the greater pulley movably, and connects with the shaft through profile. A brake ring is disposed at the circumference of the greater pulley. There is clearance between the brake ring and the greater pulley. The brake ring is secured to the bracket through stanchions.2-4 brake levers are disposed between the driving parts with eccentric grooves and the greater pulley. The eccentric grooves on driving parts correspond to the brake levers. One end of the brake lever is inserted into the groove of driving part with eccentric grooves through corresponding notch on the hub of the greater pulley and active link each other. The other end connected with brake block is inserted into the corresponding brake lever holes on the circumference of the greater pulley. There is a spring on the brake lever. The rotation of the smaller pulley on the shaft of the motor drives the greater belt pulley to rotate.

Description

Quick brake device

The utility model relates to a quick braking device for a power tool. Background technique

Some power tools require that the motor rotor stop rotating shortly after the power is turned off, and the rotating member stops rotating. For example, a cutting machine requires that the blade must stop rotating within 3 to 5 seconds after the power is turned off. The brake device is electronically braked. Once the electronic component fails, the electronic brake will cause a "bite" phenomenon, which will cause damage to the motor. The brake device of the electric motor disclosed in the patent specification of the utility model No. 02208053. 1 adopts electromagnetic braking, that is, a friction disc is mounted on the rotor shaft of the motor, and the magnetism is magnetized by the friction disc to generate the magnetic force against the resistance of the spring. Braking requirements, but the structure is more complicated. Summary of the invention

The purpose of the utility model is to provide a quick braking device using mechanical inertia braking with simple structure and reliable performance.

The utility model has a support frame, a motor and a bearing seat fixed on the support frame, a rotating shaft fixed in the bearing seat and provided with a rotating member, and a belt transmission mechanism including large and small pulleys. To achieve the above object, the utility model A transmission member with an eccentric groove is arranged between the rotating shaft and the large pulley, and a transmission connection between the transmission member with the eccentric groove and the large pulley is formed by a profile connection with the rotating shaft; a moving ring, a gap between the brake ring and the large pulley, the brake ring is fixed on the support frame by the support post; 2 to 4 brake levers are arranged between the transmission part with the eccentric cymbal and the side of the large pulley wheel, The eccentric groove on the transmission member with the eccentric groove has a one-to-one correspondence with the brake lever. The brake lever passes through the corresponding notch on the large pulley hub, and one end thereof is inserted into the corresponding eccentric groove of the transmission member with the eccentric groove and is active. The other end, that is, the brake end is inserted into the corresponding brake rod hole on the side of the large pulley and is connected with a brake block. The brake block extends out of the brake rod hole of the large pulley and expands and contracts with the brake lever. The inner wall of the brake ring can be separated; the brake lever is provided with pressure Large pulley driven in rotation by a small pulley on the motor shaft via a belt.

The eccentrically grooved transmission member and the large pulley are provided with a tangential direction of the transmission member with the eccentric groove The tension spring.

The profile connection between the transmission member with the eccentric groove and the rotating shaft is formed by a rotating shaft having a square or flat cross section and a transmission member having an eccentric groove having a correspondingly shaped shaft hole.

One end of the eccentric groove of the transmission member inserted into the transmission member with the eccentric groove is a hook shape, and the eccentric groove on the transmission member with the eccentric groove penetrates the upper and lower end faces, and the hook end of the brake lever is inserted from the upper end surface.

The connection between the brake pad and the brake end of the brake lever is plugged and glued.

There are two brake levers provided between the transmission member with the eccentric groove and the side of the large pulley.

The utility model utilizes the rotary member provided on the rotating shaft to have the characteristics of large moment of inertia. When the motor power is cut off, the inertia of the rotating member drives the transmission member with the core groove to deflect, and the compression spring pushes the brake lever to press the brake block. The utility model has the advantages of simple structure, reliable performance, low cost and convenient maintenance on the inner wall of the brake ring to achieve the purpose of rapid braking. DRAWINGS

Figure 1 is a view showing the overall structure of the present invention;

Figure 2 is a perspective view of the utility model omitting the rotating member;

Figure 3 is a three-dimensional (forward) view of the large pulley;

Figure 4 is a three-dimensional (reverse) view of the large pulley;

Fig. 5 is a transmission (positive) view of the transmission with eccentric grooves;

Figure 6 is a transmission (reverse) view of the transmission with eccentric grooves;

Figure 7 is a view of the shaft;

Figure 8 is a view of the brake lever;

Figure 9 shows the brake block view. detailed description

The embodiment of Figures 1 to 9 has a support frame 1 and a rotating shaft 7, on which a motor 2 and a bearing housing 6 are fixed, and upper and lower bearings 5 are provided in the bearing housing 6. The upper part of the rotating shaft 7 extends into the bearing housing 6 and is connected with the upper and lower bearings 5. A large pulley 9 is arranged below the bearing housing 6, and a bearing 8 and a transmission member with an eccentric groove are arranged between the large pulley 9 and the rotating shaft 7. 12, the transmission member 12 with the eccentric groove and the large pulley 9 are movably matched, with eccentricity The transmission member 12 of the groove is connected to the rotating shaft 7 in a profiled manner, that is, the rotating shaft 7 having a square or flat cross section is matched with the transmission member 12 having the eccentric groove having the corresponding shaped shaft hole 12-1. The lower portion of the rotating shaft 7 is connected with a rotating member 17, and the rotating member 17 may be in the form of a strip or a disk, such as a lawn mower, and the rotating member 17 is a strip-shaped blade (shown in Fig. 1). The large pulley 9 is connected to the small pulley 3 connected to the motor main shaft 2-1 by a belt 4. The periphery of the large pulley 9 is provided with a brake ring 16 having a gap with the large pulley 9, and a support 11 is provided between the brake ring 16 and the support frame 1. The brake ring 16 is supported by the screw 10, the support 11 and the support Rack 1 is fixedly connected.

Two to four brake levers 13 are provided between the transmission member 12 having the eccentric groove and the large pulley side 9-1. In this embodiment, two brake levers 13 are disposed at opposite positions. A pressure spring 14 is provided on each of the two brake levers 13. One end 13-1 of the brake lever 13 is a hook end, and the other end 13-2 is provided with a brake block 15 at the braking end. The brake block 15 is inserted into the braking end face of the brake lever 13, and is glued. . The eccentric 橹 12-2 on the transmission member 12 with the eccentric groove is two and corresponding to the two brake levers 13 at opposite positions, and the eccentric groove 12-2 penetrates the upper and lower end faces. There are two notches 9-2-1 in the opposite position on the large pulley hub 9-2, and two notches 9 on the large pulley hub 9-2 are provided on the large pulley side 9-1. 2-1 respectively correspond to the two brake lever holes 9-1-1. The two brake levers 13 respectively pass through the corresponding notches 9-2-1 on the large pulley hub, and the hook ends 13-1 are inserted into the corresponding eccentric grooves 12-2 from the upper end faces of the transmission members with the eccentric grooves and The movable connection, the brake end 13-2 is inserted into the corresponding brake lever hole 9-1-1 on the large pulley, and the brake block 15 inserted on the brake end 13-2 is extended from the large pulley 9 The brake lever hole 9-1-1 and the extension and contraction of the brake lever 13 are engageable with the inner wall of the brake ring 16.

On the side of the transmission member 12 with the eccentric groove, there are two radially protruding spring rods 12 - 3 in opposite positions, and the large pulley hub 9-2 is provided with a transmission spring with an eccentric groove The large gap 9-2-2 of the rod 12-3 Χϊ1·, the tension spring rod 12-3 protrudes from the large gap 9-2-2, and the transmission member 12 with the eccentric groove and the large pulley 9 rotate relative to each other. Moving in the large gap 9-2-2, the bottom surface of the large pulley 9 is provided with two tension spring springs 19 corresponding to the two tension spring rods 12-3 of the transmission member with the eccentric groove, and the corresponding tension spring rod 12- 3 and the tension spring column 19 is connected with a tension spring 18 which is aligned with the tangential direction of the transmission member 12 with the eccentric groove, that is, the force direction of the tension spring 18 is tangent to the outer periphery of the transmission member 12 with the eccentric groove.

In the utility model, when the motor is energized and the normal operation, the large pulley 9 is rotated by the small pulley 3 on the motor main shaft 2-1 through the belt 4, and the hook end 13-1 of the brake lever 13 is in the transmission with the eccentric groove. The eccentric groove 12-2 of the piece is close to the center of the shaft 7 (the state shown in Fig. 2), the brake block 15 on the brake lever and the brake The ring 16 is in a separate shape and the compression spring 14 is compressed. The large pulley 9 rotates the shaft 7 and the blade 17 through the transmission member 13 with the eccentric groove connected to the shaft 7 profile, and is in an operating state at this time.

When the motor power is cut off, the pulley and the blade are still rotating due to inertia, and at this time, since the rotational inertia of the rotating member 17 on the rotating shaft 7 is large, the rotating speed of the rotating shaft 7 is greater than the rotating speed of the large pulley 9, and the belt The transmission member 12 of the eccentric groove is movably engaged with the large pulley 9, so that the rotating shaft 7 drives the transmission member 12 with the eccentric groove to have a displacement relative to the large pulley 9, and the hook end 13-1 of the brake lever 13 is driven by the eccentric groove. The end of the eccentric groove which is close to the center of the rotating shaft 7 moves to the end far from the center of the rotating shaft 7, and the brake lever 13 projects to the side of the braking ring 16 under the action of the compression spring 14, and the brake block 15 is closely attached thereto. The inner wall of the brake ring rotates with the large pulley 9 and the blade 17, and the frictional resistance torque generated between the brake block 15 and the inner wall of the brake ring 16 overcomes the moment of inertia, so that the system stops rotating rapidly. The function of the two tension springs 18 is to accelerate the relative deflection between the transmission member 13 with the eccentric groove and the large pulley 9 during braking, thereby advancing the braking start time and shortening the time required for the braking process.

When the motor is energized, the large pulley 9 is rotated by the small pulley 3 on the motor main shaft 2-1 through the belt 4. At this time, the large pulley 9 drives the brake lever 13 in the transmission member with the eccentric groove due to the inertia. The inner end of the eccentric groove 12-2 moves from the end far from the center of the rotating shaft 7 to the end close to the center of the rotating shaft 7, the brake lever 13 is separated from the braking ring 16, and the large pulley 9 drives the shaft 12 of the transmission member 12 with the eccentric groove and The rotary member 17 rotates.

Claims

Claim

1. A quick brake device having a support frame (1), a motor (2) fixed to the support frame (1) and a bearing housing (6), connected to the bearing housing (6) and provided with a rotating member (17) The shaft (7) and the belt transmission mechanism including the large and small pulleys (9, 3) are characterized in that: a bearing (8) and an eccentric 橹 are provided between the rotating shaft (7) and the large pulley (9). The transmission member (12), the transmission member (12) with the eccentric groove is dynamically connected with the large pulley (9), and is connected with the rotating shaft (7); the outer circumference of the large pulley (9) There is a brake ring (16), a gap between the brake ring (16) and the large pulley (9), and the brake ring (16) is fixed on the support frame (1) by the support post (11); 2 to 4 brake levers (13) are provided between the transmission member (12) and the large pulley side (9-1), and the eccentric groove (12-2) on the transmission member (12) with the eccentric groove is The brake levers (13) are in one-to-one correspondence, and the brake levers (13) pass through corresponding notches (9-2-1) on the large pulley hub (9-2), and one end (13-1) is inserted into the eccentric groove. In the corresponding eccentric groove (12-2) on the transmission member (12) and active Connect the other end, that is, the braking end (13-2) into the corresponding brake lever hole (9 1 1) on the large pulley side (9-1) and connect the brake block (15), the brake block (15) Extend the brake lever hole (9-1-1) of the large pulley (9) and disengage from the inner wall of the brake ring (16) with the expansion and contraction of the brake lever (13); (13) The upper part is provided with a compression spring (14), and the large pulley (9) is rotated by the small pulley (3) on the motor main shaft (2-1) through the belt (4).

2. The quick brake device according to claim 1, characterized in that: the tangential direction of the transmission member (12) with the eccentric groove is provided between the transmission member (12) with the eccentric groove and the large pulley (9) Uniform tension spring (18).

3. The quick brake device according to claim 2, characterized in that: the connecting surface between the transmission member (12) with the eccentric groove and the rotating shaft (7) is connected to the rotating shaft (7) of a square or flat section and has corresponding The transmission member (12) with the eccentric groove of the shape shaft hole (12-1) is configured to cooperate.

4. The quick brake device according to claim 3, characterized in that: the brake lever (13) is inserted into one end of the eccentric groove (12-2) of the transmission member (12) with the eccentric groove (13- 1) In the shape of a hook, the eccentric groove (12-2) on the transmission member (12) with the eccentric groove penetrates the upper and lower end faces, and the hook end (13-1) of the brake lever (13) is inserted from the upper end surface.

5. The quick brake device according to claim 4, wherein: the brake block (15) The connection to the brake end (13-2) of the brake lever (13) is plugged and glued.

6. The quick brake device according to claim 5, characterized in that: the brake lever (13) provided between the transmission member (12) with the eccentric groove and the large pulley side (9-1) is 2