JPH059655U - Centrifuge drive - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a centrifuge drive device that realizes rotation prevention of a bearing outer ring that supports a drive shaft of a motor, increases drive rotational speed, and increases unbalance of a rotor. [Structure] The ball bearing 8A is an end bracket 9 covered by a stuffing cover 16 through which the rotary shaft 2 penetrates.
It is fitted to the lower end of the sleeve 5 which is press-fitted into. The contact surface between the sleeve 5 and the outer ring of the ball bearing 8A of the slide ring 17 that slides on the inner peripheral surface of the sleeve 5 is cut out, and the O-ring 6 is inserted into this cutout portion. The spring 4 is stretched between the sliding ring 17 and the stuffing cover 16. And the sliding ring 1 with the spring 4
7. The O-ring 6 was pressed against the ball bearing 8A to prevent the outer ring of the ball bearing 8A from rotating.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a drive device for a centrifuge.

[0002]

[Prior Art]

 As disclosed in US Pat. No. 4,322,030, a conventional device supports a rotating shaft of a motor vertically arranged in a housing with two bearings and presses it with a spring that applies a pressure in a thrust direction of the bearings. The bearing and bearing housing have a gap of several μm, and the outer ring is pressed by the thrust in the thrust direction.

[0003]

[Problems to be solved by the device]

 Since the conventional device has the above-mentioned gap between the bearing and the bearing housing, the outer ring may rotate as the shaft rotates. In particular, when the imbalance of the rotor increases, the force increases in the radial direction of the bearing, which makes it easier for the outer ring to rotate, making it difficult to rotate at higher speeds and to increase the amount of imbalance in the sample placed in the rotor. An object of the present invention is to realize the rotation prevention of the bearing outer ring with a simple structure to increase the driving rotational speed and increase the allowable imbalance of the rotor.

[0004]

[Means for Solving the Problems]

 In order to achieve the above object, the centrifuge drive device of the present invention penetrates through a drive shaft of a motor that is directly connected to the rotor of the centrifuge and drives the rotor, a ball bearing that supports the drive shaft, and an end bracket. Fixed to the end bracket, the ball bearing is fitted in the sleeve, the drive shaft penetrates, the stuffing cover that covers the end bracket and the sleeve, the sleeve is inscribed, and the ball is slidable. In a centrifuge having a sliding ring capable of contacting an outer ring of a bearing and a spring provided between the stuffing cover and the sliding ring, the sliding ring includes an outer ring of the ball bearing and the sleeve. Is provided with a cutout portion that extends over the contact surface, and an elastic body is inserted into the cutout portion. .

[0005]

[Action]

 In the present invention, the elastic body is inserted into the notch part that extends over the contact surface between the outer ring and the sleeve of the ball bearing provided below the sliding ring, and is pressed by the spring. By contacting the inner surface of the bearing housing and pressing and fixing the end of the outer ring of the bearing and the inner surface of the bearing housing, it is possible to prevent the outer ring of the bearing from rotating around due to load fluctuations of the centrifugal machine.

[0006]

【Example】

 FIG. 1 is a sectional view of an embodiment of the centrifuge driving device of the present invention. The rotor 1 is driven by a motor rotor 10 via a rotary shaft 2 and a drive shaft 3 to rotate at high speed. The drive device is suspended by three damping rubbers 12 below a bottom plate 13 below the rotation chamber in which the rotor 1 rotates, surrounded by a housing 7 and an end bracket 9, and a stator 11 is inserted inside. ing. The motor rotor 10 is press-fitted into the drive shaft 3 and is supported by two ball bearings 8A and 8B. Oil 14 for lubrication and cooling is provided below the drive shaft 3.

The upper ball bearing 8 A is fitted to the lower end of the sleeve 5 which is press-fitted into the end bracket 9 covered by the stuffing cover 16 through which the rotary shaft 2 penetrates. A contact surface between the outer ring of the ball bearing 8A of the sliding ring 17 sliding on the inner peripheral surface of the sleeve 5 and the sleeve 5 is cut out, and the O-ring 6 is attached to the cutout portion. The spring 4 is stretched between the sliding ring 17 and the stuffing cover 16.

The O-ring 6 is deformed by the tension of the spring 4 via the sleeve 5, presses the inner surface of the sleeve 5 and the upper end of the outer ring of the ball bearing 8A, and the outer ring is rotated by the rotation of the drive shaft 3. To prevent it. By doing so, the outer ring is not rotated even if the drive shaft 3 becomes faster. Further, even if the unbalance of the rotor 1 increases and the radial load of the ball bearing 8A increases, the outer ring will not rotate.

[0009]

[Effect of the device]

 According to the present invention, since the rubber O-ring, which serves as a detent for the ball bearing, is attached to the upper end surface side of the outer ring of the ball bearing, the drive speed can be increased and the allowable imbalance of the rotor can be increased. it can.

[Brief description of drawings]

FIG. 1 is a sectional view of a centrifuge showing an embodiment of the present invention.

[Explanation of symbols]

1 is a rotor, 3 is a drive shaft, 4 is a spring, 5 is a sleeve, 6 ... O-rings, 8A and 8B are ball bearings, 9
Is an end bracket, 16 is a stuffing cover, 1
Reference numeral 7 is a sliding ring.

Claims (1)

[Claims for utility model registration] [Claim 1] A drive shaft for transmitting rotation of a motor to a rotor of a centrifuge, a ball bearing for supporting the drive shaft, and an end bracket penetratingly fixed to the end bracket. A sleeve in which the ball bearing is fitted, a stuffing cover that penetrates the drive shaft and covers the end bracket and the sleeve, and a sliding ring that is inscribed in the sleeve and is slidable and is in contact with the outer ring of the ball bearing. In the centrifuge having a spring provided between the stuffing cover and the sliding ring, the sliding ring is provided with a notch portion that extends over a contact surface between the outer ring of the ball bearing and the sleeve,
A drive device for a centrifuge, wherein an elastic body is inserted into the cutout portion.