CN104368962B - A kind of drive shaft locking nut fastening special tooling - Google Patents

Abstract

The invention discloses a special tool for fastening a drive shaft lock nut, which comprises a base plate and baffle plates arranged at both ends of the same side of the base plate, cylinders are respectively fixed on the baffle plates located at both ends of the base plate, and two cylinders are connected with one cylinder controller at the same time. Connection, the output shafts of the two cylinders are coaxial and facing the center of the substrate, the output shafts of the two cylinders are respectively fixed with limit blocks, the bottom surface of the limit block is flat, and the top surface of the limit block is from the outer end to the connection end The inclined surface inclined upwards, and the bottom surface of the limit block is provided with a friction plate. After the limit block is tightened by the cylinder, a vertical component force acts on the friction plate, so that the friction plate and the brake disc are closely attached together, and the friction plate locks the brake disc, so that there is no gap between the brake disc and the brake caliper. Relatively rotate, and then the drive shaft lock nut can be tightened conveniently. Therefore, the present invention has the beneficial effects of convenient use, high assembly efficiency, more labor-saving operation, and no damage to the wheel hub bolts.

Description

A special tool for fastening the drive shaft lock nut

technical field

The invention relates to the technical field of automobile assembly, in particular to a special tool for fastening a lock nut of a drive shaft.

Background technique

At present, common automobile brakes generally include a brake disc and a brake caliper. The middle of the brake disc is the drive shaft. The drive shaft passes through the center of the brake and is fixedly connected to the brake. During assembly, the drive shaft lock needs to be screwed into the drive shaft. During the maintenance of the brake, the drive shaft lock nut also needs to be reinstalled after being removed. However, when the drive shaft lock nut is tightened, the drive disc will rotate with the drive shaft and the assembly cannot be completed. work, thereby affecting the assembly quality. It is now common practice to press one side of the brake to the ground to prevent the drive shaft from turning inside the caliper before torqueing the drive shaft nut. This method is severely limited by the site, which brings inconvenience to the assembly and maintenance of the driver, and the installation or maintenance efficiency is very low. The contact between the brake disc and the ground will cause damage to the periphery of the brake disc and cause unevenness. Obviously, this method is seriously unsatisfactory. In line with the theory of human factors engineering.

Chinese patent authorization announcement number: CN201769041U, authorized announcement date March 23, 2011, discloses an automobile brake drive shaft locking nut tightening auxiliary tool, which includes a handle and a limit plate fixedly connected to one end of the handle, limiting There are lock nut sleeve holes and bolt limit structures on the bit plate. The bolt limit structures include two U-shaped structures. Collinear, two U-shaped structures are arranged at opposite ends of the diameter. The structure is simple and light, the operation and positioning are efficient and quick, the manufacturing is easy and the cost is low, and it can effectively solve the problem of the brake following the rotation when the drive shaft lock nut is tightened on the automobile production line. When using this kind of auxiliary tool, you need to hold the handle of the tool with your left hand, and hold the torque wrench with your right hand to tighten the lock nut of the drive shaft for constant torque operation, and the lock nut of the drive shaft requires a lot of force to lock, while the left hand 2. The force on the right hand is action force and reaction force. Both hands will be subjected to a large force, and the fatigue intensity is high. When holding the handle or torque wrench with both hands out of thin air, the force provided is small due to the lack of support points. At the beginning It may be possible to tighten the lock nut of the drive shaft normally at some time. After a long time, it is easy to cause fatigue and cause the lock nut of the drive shaft to be tightened. In addition, during the screwing process, the two U-shaped structures and the hub bolts on the brake disc are limited. , the radial force on the stud of the hub bolt will cause thread damage.

Contents of the invention

The present invention provides an easy-to-use tool in order to overcome the disadvantages of the drive shaft lock nut fastening auxiliary tool in the prior art that the operator is prone to fatigue and affects the assembly efficiency, and at the same time it will damage the thread of the hub bolt. The assembly efficiency is high, the operation is more labor-saving, and the special tool for fastening the drive shaft lock nut of the hub bolt will not be damaged.

In order to achieve the above object, the present invention adopts the following technical solutions:

A special tool for tightening drive shaft lock nuts, including a base plate and baffle plates located at both ends of the same side of the base plate, cylinders are respectively fixed on the baffle plates located at both ends of the base plate, two cylinders are connected to one cylinder controller at the same time, and two The output shafts of the cylinders are coaxial and towards the center of the base plate. Limiting blocks are respectively fixed on the output shafts of the two cylinders. The bottom surface of the limiting blocks is flat, and the top surface of the limiting blocks is upward from the outer end to the connecting end. The inclined slope, the bottom surface of the limit block is provided with a friction plate. The head of the limit block is wedge-shaped, and the heads of the two limit blocks are respectively stuck in the gap between the brake pad and the brake disc at both ends of the brake caliper. The friction pad contacts the brake disc, and then passes through the cylinder controller. At the same time, the output shafts of the two cylinders are controlled to extend, so that the upper side of the head of the limit block is tightly pressed against the brake pad, and the friction pad is pressed against the brake disc, so that the brake disc can be prevented from rotating, and then tightened with a wrench The drive shaft lock nut, after the drive shaft lock nut is tightened, the cylinder output shaft is retracted through the cylinder controller, and the tooling can be removed. The whole process is very convenient, labor-saving, and the assembly efficiency is high. Damage to the hub bolts.

Preferably, the baffle has an L-shaped cross-section, one of its outer sides is attached to the base plate, and the other inner side is fixedly connected to the cylinder. The L-shaped structure of the baffle has high connection strength, and after the output shaft of the cylinder is extended, it can bear a large supporting force.

As a preference, the baffle and the base plate are connected by a rotating shaft, the base plate is provided with an arc-shaped hole, the connecting surface of the baffle plate and the base plate is provided with a limit bolt, and the outer end of the limit bolt passes through the Through the arc hole and locked by the nut. Since the two ends of the brake caliper are basically not parallel, and generally form an angle between 20° and 40°, the baffle can rotate around the rotating shaft within a certain range, so it can Angle Adjust the angle of the baffle so that the heads of the two limit blocks are perpendicular to both ends of the brake caliper. At this time, the contact surface between the limit block and the brake pad is the largest. After the output shaft of the cylinder is extended, the force on the limit block is even , stable, and the pressure effect on the friction surface is the best, so this kind of tooling can be used for different types of brakes and has strong versatility.

Preferably, the coefficient of friction between the friction plate and the brake disc is ≥0.42. According to the national standard, the friction coefficient between the brake pad and the brake disc is between 0.35-0.40. This range makes the brake pad neither invalid nor lock the brake disc. After the friction coefficient of the friction pad is greater than 0.40, it can guarantee After receiving the vertical force, the friction plate locks the brake disc, so that the brake disc cannot rotate, and it is convenient to tighten the lock nut of the drive shaft.

Preferably, a pin hole is provided in the middle part of the substrate, and a positioning pin is provided in the pin hole. When the force of the two support blocks is perpendicular to the two ends of the brake caliper, the reaction force received by the two support blocks is not a balanced force, so the entire base plate will be offset to the center of the brake disc, in order to prevent this deviation At this time, insert the positioning pin into the positioning hole, and the head of the positioning pin just snaps into the gap between the inner side of the brake caliper and the boss on the brake disc, so as to provide an outward force for the entire base plate to balance the two The resultant force on the support block.

Preferably, the two ends of the base plate are respectively covered with rubber protective sleeves, and the rubber protective sleeves cover the baffle plate and the cylinder together. The rubber protective sleeve covers the lower end of the baffle and the cylinder to prevent the lower end of the baffle or various corners of the cylinder from contacting the drive disc and damaging the friction surface of the drive disc.

Preferably, armrests are provided on the opposite side of the base plate to the baffle. Armrests facilitate installation and removal of the entire tooling.

Therefore, the present invention has the beneficial effects of convenient use, high assembly efficiency, more labor-saving operation, and no damage to the wheel hub bolts.

Description of drawings

Fig. 1 is a kind of structure diagram of the present invention.

Fig. 2 is a schematic view of the side structure of the present invention.

In the figure: base plate 1 baffle plate 2 cylinder 3 limit block 4 friction plate 5 rotating shaft 6 arc hole 7 limit bolt 8 nut 9 brake disc 10 pin hole 11 positioning pin 12 rubber protective sleeve 13 armrest 14 brake caliper 15 drive Shaft 16 Hub bolt 17 Brake pad 18.

detailed description

The present invention will be further described below in conjunction with accompanying drawing and specific embodiment:

As shown in Figure 1 and Figure 2, a special tool for fastening the lock nut of the drive shaft, including a base plate 1 and a baffle plate 2 arranged at both ends of the same side of the base plate, an armrest 14 is provided on the opposite side of the base plate 1 and the baffle plate, and the baffle plate 2 The cross-section is an L-shaped structure, one of the outer sides is connected to the base plate 1, and the other inner side is fixedly connected to the cylinder 3, and the two cylinders are connected to a cylinder controller at the same time, which is convenient to control the simultaneous expansion and contraction of the two cylinders. The output shafts of the cylinder 3 are coaxial and towards the center of the substrate. The output shafts of the two cylinders are respectively fixed with a limit block 4. The limit block has a wedge-shaped structure. The bottom surface of the limit block 4 is a plane, and the top surface of the limit block 4 It is a slope inclined upward from the outer end to the connecting end. The wedge-shaped structure of the head of the limit block can be inserted into the tiny gap between the friction plate and the brake disc. The bottom surface of the limit block 4 is provided with a friction plate 5, and the friction plate The coefficient of friction between 5 and the brake disc 10 is ≥0.42. In this embodiment, the coefficient of friction between the friction disc 5 and the brake disc 10 is 0.45, which can ensure that the friction disc locks the brake disc after being subjected to a vertical force. , so that the brake disc cannot rotate, and it is convenient to tighten the lock nut of the drive shaft; the two ends of the base plate 1 are respectively covered with rubber protective sleeves 13, and the rubber protective sleeve covers the baffle plate and the cylinder together, and the rubber protective sleeve covers the baffle plate. The lower end, the cylinder, etc. are covered to prevent the lower end of the baffle or various corners of the cylinder from contacting the drive disc and damaging the friction surface of the drive disc.

The baffle plate 2 and the base plate 1 are connected by a rotating shaft 6, the base plate is provided with an arc-shaped hole 7, and the connecting surface between the baffle plate 2 and the base plate 1 is provided with a limit bolt 8, and the outer end of the limit bolt passes through the arc-shaped hole and Lock it with nut 9. Since the two ends of the brake caliper are basically not parallel, and generally form an angle between 20° and 40°, the baffle can rotate around the rotating shaft within a certain range, so it can Angle Adjust the angle of the baffle so that the heads of the two limit blocks are perpendicular to both ends of the brake caliper. At this time, the contact surface between the limit block and the brake pad is the largest. After the output shaft of the cylinder is extended, the force on the limit block is even , stable, and the pressure effect on the friction surface is the best, so this kind of tooling can be used for different types of brakes, and has strong versatility; the middle part of the base plate 1 is provided with a pin hole 11, and a positioning pin 12 is provided in the pin hole 11. When When the force of the two support blocks is perpendicular to the two ends of the brake caliper, the reaction force received by the two support blocks is not a balanced force, so the entire base plate will be offset to the center of the brake disc, in order to prevent the offset At this time, insert the positioning pin into the positioning hole, and the head of the positioning pin just snaps into the gap between the inner side of the brake caliper and the boss on the brake disc, so as to provide an outward force for the entire base plate to balance the two supports The resultant force on the block.

In conjunction with the accompanying drawings, the method of use of the present invention is as follows: the output shaft of the cylinder is controlled by the cylinder controller to retract, the nut 9 and the limit bolt 8 are loosened, and then the limit blocks on the two cylinders are clamped at both ends of the brake caliper, Make the friction plate fit the surface of the brake disc, insert the positioning pin 12, make the positioning pin stuck in the gap between the inner side of the brake caliper and the boss on the brake disc, and then control the output shaft of the cylinder to extend through the cylinder controller. The wedge-shaped structure of the head of the block is stuck in the gap between the friction plate and the brake disc, and the baffle rotates with the force of the limit block, so that the upper side of the head of the limit block is as close as possible to the friction plate. Then tighten the nut 9. At this time, the brake disc and the brake caliper are tightly locked and locked due to the action of the friction plate, so that relative rotation cannot occur. Finally, the drive shaft lock nut can be easily tightened. During the whole process, the tooling will not contact the hub bolts and will not damage the hub bolts. Therefore, the present invention has the beneficial effects of convenient use, high assembly efficiency, more labor-saving operation, and no damage to the wheel hub bolts.

Claims (5)

1. a drive shaft locking nut fastening special tooling, it is characterized in that, including substrate (1) and the baffle plate (2) that is located at substrate homonymy two ends, it is positioned on the baffle plate at substrate two ends and is respectively fixed with cylinder (3), two cylinders connect with a cylinder controller simultaneously, the output shaft of two cylinders (3) is coaxial and center towards substrate, limited block (4) it is respectively fixed with on the output shaft of two cylinders, the bottom surface of described limited block (4) is plane, the end face of limited block (4) is to connecting the acclivitous inclined-plane of end from outer end, the bottom surface of described limited block (4) is provided with friction plate (5)；The L-shaped structure in cross section of described baffle plate (2), wherein a lateral surface is fitted and connected with substrate (1), and another medial surface is fixing with cylinder (3) to be connected；It is connected by rotating shaft (6) between described baffle plate (2) and substrate (1), described substrate is provided with arcuate socket (7), described baffle plate (2) is provided with caging bolt (8) with the joint face of substrate (1), and the outer end of caging bolt is locked through arcuate socket and by nut (9).

A kind of drive shaft locking nut fastening special tooling the most according to claim 1, is characterized in that, coefficient of friction >=0.42 between described friction plate (5) and brake disc (10).

A kind of drive shaft locking nut fastening special tooling the most according to claim 1, is characterized in that, the middle part of substrate (1) is provided with pin-and-hole (11), is provided with alignment pin (12) in described pin-and-hole (11).

A kind of drive shaft locking nut fastening special tooling the most according to claim 1, is characterized in that, the two ends of substrate (1) are cased with rubber protecting jacket (13) respectively, and described rubber protecting jacket together envelopes baffle plate, cylinder.

A kind of drive shaft locking nut fastening special tooling the most according to claim 1, is characterized in that, upper and baffle plate the opposite flank of described substrate (1) is provided with handrail (14).