Such an element as a bearing is used in many units and mechanisms. It can also be found on the car. For example, this is a clutch release bearing or a hub element. In any case, a puller is required to dismantle it. The bearing is very tight. It is extremely difficult to extract it with improvised means. Therefore, today we will consider what bearing pullers are, their sizes and design features.
Device
The main element in the design of this element is the central bolt. It is due to him that the puller works. The bearing is thus squeezed out of the workplace or, conversely, pressed in (depending on which way to turn the central bolt). Some machines are equipped with a hydraulic cylinder (for example, a hydraulic bearing puller, as in the photo below).
Also in the design there are grips. They come in two varieties:
- Grips that are engaged with the object to be retrieved using a special tool. They work regardless of the action of the bolt.
- Clamping the part due to the force of the bolt or hydraulic cylinder.
Material from which the puller is made
The bearing is a part that is quite difficult to remove. Therefore, puller manufacturers use only high-strength alloyed materials. Responsible nodes in these elements are formed by forging. As for power bolts, they have higher strength than those used in conventional threaded connections.
Views
There are several varieties of these tools. All of them differ in the type of capture. It can be:
- Moving.
- Rotary.
- Tapered.
- With separator.
- Universal.
In terms of dimensions, the inner bearing puller may have different diameters. On average - from 28 to 200 millimeters. The height of the foot is from 35 to 60 millimeters. Bolt head size - from 9 to 22 millimeters.
Sliding puller
The bearing is quite easy to remove 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 clamps for the grips.
This can be an inner bearing puller or outer bearing puller. 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 a power bolt. This prevents the bearing from moving. The set of sliding pullers includes grippers of different lengths. Also the tool is completed with replaceable tips. Usually theyhave the same dimensions (serve as a substitute in case of failure of the first element).
With swivel arms
They have a different design. The grips are secured with bolts. For which vehicles is this bearing puller used? VAZ, MAZ, GAZ, Mercedes - this is an incomplete list of cars on which this tool can be used.
The puller has stops with double-sided grip. There are tools with a tripartite. There are 4 fixing points on the body of the device. Bearing pullers are installed on them. The grip width of the device is from 5 to 7 centimeters. Used to remove small bearings, including dismantling the tip of the battery wires. Can be equipped with impact mechanism.
With conical latch lock
These tools have 3 jaws and are used in situations where it is required to eliminate load imbalance when dismounting a bearing. Often this type of hydraulic bearing puller is sold.
Centering grips is automatic. Also in the design there is a conical nut, which is manually wrapped when installing the tool. On some models it is spring loaded. It has a limited range of uses. It will no longer be possible to turn the clamps over here.
With separator
These tools are highly reliable. The element is based on a separator. It is installed under the removed bearing. Bothhalves of the separator are bolted together for a more secure grip. After that, the pulling part will be connected to the tool.
Its side nuts are adjustable according to the cage position. The power bolt is driven onto the axis of the part to be removed. The tool can be used in combination with a sliding puller. However, when working with two mechanisms, it is required to monitor the safety of the threads of the bolts.
Universal
Universal bearing pullers are used most often. They also extract gears, pulleys and other mechanisms. The design is based on a power bolt made of alloy steel. By rotating it, the master creates a dismantling force that is applied to the reference point. Through the central body of the tool, this force is transmitted to the clamps. Thus, the part is pulled out or pressed into place. Universal pullers are used for both internal and external bearings.
Price
Price may vary by type, as well as the set of tools included.
The cheapest are two- and three-jaw mechanical type sliding pullers. Their price ranges from 500 to 1 thousand rubles. Hydraulic devices are the most expensive. They are offered on 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.
Parameters
To choose the right bearing puller, you need to knowWhat parameters should it meet? When buying, you should pay attention to the following points:
- Maximum allowable load. This parameter is determined by the strength of the central body of the puller and the power bolt. For mechanical tools, this parameter ranges from 1 to 4 tons. Hydraulic pullers have a force of about 20 tons (but they also have a corresponding price). However, mechanical tools are sufficient to remove items such as the wheel bearing.
- Working stroke. It depends on the overhang of the power bolt and the length of the grips.
- The dimensions of the puller legs (in particular, the width and height of the stop).
- Minimum and maximum grip openings.
Primitive do-it-yourself puller
This tool can be made independently. A steel pipe is used as the main element. Its diameter should be slightly larger than that of the clip. So, with the help of a grinder, we cut off a piece of pipe of the desired length. It depends on the size of the screw. Next, by welding, we connect the C-shaped washer to the cut out part of the pipe. On the other hand, a nut with an internal thread is welded. It must match the parameters of your screw. This type of puller is the easiest to manufacture. However, it will only fit a specific bearing diameter.
Making a universal tool
Such a puller will fit different diameter elements. So, we need to make paws from a 10 mm steel sheet. It is better to use pre-prepared templates. They can be made on cardboard orpaper, then mark on a metal sheet and cut with a grinder.
Then you need to pick up the bolt. We sharpen it under a cone. Six lugs with holes are welded to the nut. Our paws will be attached to the latter. Ears are cut out of metal with a thickness of 5 millimeters. The ears are welded to the nut in assembled form. Next, the bolts are unscrewed and the joints of the legs are finally welded. At this stage, the assembly of the device is completed. You can begin to fully use the tool.
Conclusion
So, we found out what types of pullers for bearings are. The most common types are universal solutions of the 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 wheel bearing. In services, the cost of this service is from 3 thousand rubles.
