The puller. Bearing. Types of pullers, description, purpose

An element such as a bearing is used in many nodes and mechanisms. It can also be found on the car. For example, it is a clutch release bearing or hub element. In any case, a puller is required to remove it. The bearing is seated very tightly. Extract it with improvised means is extremely difficult. Therefore, today we will consider what sorts of bearings are, their dimensions and design features.

Device

The main element in the construction of this element is the central bolt. It is due to it that the puller works. The bearing is thus squeezed out of the workplace or, on the contrary, is pressed (depending on which way the central bolt is turned). Some devices are equipped with a hydraulic cylinder (for example, a hydraulic puller of bearings, as in the photo below). Also in the construction there are grippers. They come in two varieties:

• Grapples that engage with the extracted object with the help of a special tool. They work independently of the action of the bolt.
• The pressing parts are due to the force of the bolt or hydraulic cylinder.

The material from which the stripper is made

Bearing is a part that is difficult to remove. Therefore, the manufacturers of pullers use only high-strength alloyed materials. Responsible nodes in these elements are formed by forging. As for power bolts, they have a higher strength than those used in conventional threaded joints.

Kinds

There are several varieties of these tools. All of them differ in the type of capture. He can be:

• Sliding.
• Turning.
• Conical.
• With a separator.
• Universal.

As for dimensions, the puller of internal bearings may have a different diameter. On the average - from 28 to 200 millimeters. The height of the foot is from 35 to 60 millimeters. The size of the bolt head is from 9 to 22 millimeters.

Slip Puller

It is quite easy to remove the bearing with such a tool. Such a puller has two grippers that move freely along the beam. In the middle of the latter there is a threaded hole. In the upper part, the bolts can serve as fixators for the grippers. It can be a puller of internal bearings or external. To change its purpose, it is enough to rearrange the grips. By the way, their maximum solution is from 10 to 80 centimeters. The device has stops for the power bolt. This prevents the bearing from shifting. The set of sliding pullers includes grippers of different lengths. The tool is also equipped with interchangeable tips. Usually they have the same dimensions (they serve as a substitute for the failure of the first element).

With swivel arms

They have a different design. Grips are stopped with bolts. For which cars is this bearing stripper used? VAZ, MAZ, GAZ, "Mercedes" - this is a partial list of cars on which this tool can be used. The puller has stops with a double-sided gripper. There are tools and with a three-way. There are 4 fixing points on the body of the device. They install the paws of the bearing puller. The width of the device is from 5 to 7 centimeters. Used for removing small-sized bearings, including for removing the tip of battery wires. Can be equipped with a shock mechanism.

With conical clamp

These tools have 3 grippers and are used in those situations where it is necessary to eliminate the asymmetry of the load during the removal of the bearing. Often this type is sold to a hydraulic bearing puller. The centering of the grips is automatic. Also in the design there is a conical nut that is manually wrapped when the tool is installed. On some models it is spring-loaded. Has a limited range of uses. Turn the clamps here no longer work.

With separator

These tools are highly reliable. The element is based on a separator. It is installed under the bearing to be removed. Both halves of the separator are bolted for more reliable grip. After that, the pulling part is connected to the tool. Its side nuts are adjusted in accordance with the position of the separator. The power bolt is wound onto the axis of the part being removed. The tool can be used in conjunction with a sliding puller. However, when working with two mechanisms, it is required to monitor the safety of thread bolts.

Universal

Pullers universal for bearings are used most often. They also extract gears, pulleys and other mechanisms. At the heart of the construction is a power bolt made of alloy steel. Rotating it, the master creates a pulling force that is attached to the reference point. Through the central body of the instrument, this force is transferred to the clamps. In this way, the part is taken out or pressed into place. Universal pullers are used for both internal and external bearings.

Price

The cost can vary from the type, as well as the set of tools that comes with the kit. The cheapest are two- and three-gripping sliding pullers of mechanical type. Their price ranges from 500 to 1 thousand rubles. Hydraulic devices are the most expensive. They are offered in the market at a price of 25 thousand rubles. The cost of universal mechanical solutions is around 10 thousand rubles. The kit includes a set of mandrels.

Options

In order to select the correct bearing puller, it is necessary to know which parameters it should meet. When buying, you should pay attention to the following points:

• Maximum permissible load. This parameter is determined by the strength of the central body of the puller and the power bolt. For mechanical tools this parameter is from 1 to 4 tons. Hydraulic pullers have an effort of about 20 tons (but they also have a price). However, for the dismantling of such elements as the hub bearing, there are enough mechanical tools.
• Working stroke. It depends on the outreach of the power bolt and the length of the grippers.
• Dimensions of the puller's legs (in particular, the width and height of the stop).
• Minimum and maximum grip solution.

Primitive puller with your own hands

This tool can be manufactured independently. The main element is a steel pipe. Its diameter should be slightly larger than that of the clip. So, with the help of the Bulgarian, cut off a piece of pipe of the required length. It depends on the size of the screw. Then, by welding, we connect the C-shaped washer to the cut out part of the pipe. On the other hand, a nut with a female thread is welded. It should match the parameters of your screw. This type of puller is the easiest to manufacture. However, it is suitable only for the specific diameter of the bearings.

We make a universal tool

Such a puller will fit the different diameter of the elements. So, we need to make paws of 10 mm steel sheet. It is better to use pre-prepared templates. They can be made on cardboard or paper, then mark them on a sheet of metal and cut them out with a bulgarian. Then you need to pick up the bolt. We sharpen it under the cone. To the nut, welds six ears with holes. In the last our feet will be fastened. The ears are cut from metal with a thickness of 5 millimeters. The ears are welded to the nut in the assembled state. Then loosen the bolts and the joints of the legs are welded completely. At this point, the assembly of the device is complete. You can start using the tool fully.

Conclusion

So, we found out what kinds of pullers are available for bearings. The most common types are universal solutions of mechanical type. They can be used to extract any bearings and pulleys. A puller is a very useful thing in the household. Especially if you own a car. With this tool, you can even perform such a complex operation as replacing a hub bearing. In services the cost of this service is from 3 thousand rubles.