Double-nut locking structure

Abstract

The utility model discloses a double-nut locking structure, which belongs to the technical field of mechanical design and is characterized in that after a bearing is mounted on an electric spindle, a limiting mechanism is sleeved on the electric spindle, so that the bearing can be locked; the limiting mechanism comprises an inner side locking nut and an outer side sealing nut; the inner side locking nut is meshed with threads on the electric spindle, and one side of the inner side locking nut is tightly attached to the bearing; the outer side sealing nut is meshed with threads on the electric spindle, and one side of the outer side sealing nut is tightly attached to the other side of the inner side locking nut. A fastener connected with the inner locking nut is arranged on the other side face of the outer sealing nut and used for connecting the outer sealing nut with the inner locking nut, so that teeth on the outer sealing nut, the inner locking nut and the motorized spindle deform, and the purpose of loosening is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical design, in particular to a double-nut locking structure. Background Art

[0002] The electric spindle is a device that integrates an electric motor and a spindle, and has the characteristics of small size, compact structure and good static and dynamic performance.

[0003] During the operation of the electric spindle, in order to prevent the bearing locking nut from loosening due to the influence of vibration during rotation, a thread in the opposite direction of rotation is set on the electric spindle, and then a single nut is screwed onto the electric spindle to lock the bearing. However, when the rotation direction of the electric spindle changes, it is necessary to re-set the thread in the opposite direction on the electric spindle, which makes the operation troublesome, and this nut locking method cannot guarantee the locking of the bearing. Utility Model Content

[0004] In order to solve the problems of the prior art, the utility model provides a double-nut locking structure, comprising: after the bearing is installed on the electric spindle, the limiting mechanism is sleeved on the electric spindle to lock the bearing;

[0005] The limiting mechanism comprises: an inner locking nut and an outer sealing nut;

[0006] The inner locking nut is meshed with the thread on the electric spindle, and one side of the inner locking nut is in close contact with the bearing;

[0007] The outer sealing nut is meshed with the thread on the electric spindle, and one side of the outer sealing nut is in close contact with the other side of the inner locking nut;

[0008] A fastener connected to the inner locking nut is provided on the other side of the outer sealing nut. The fastener is used to connect the outer sealing nut and the inner locking nut, and at the same time deform the teeth of the outer sealing nut and the inner locking nut and the electric spindle to achieve the purpose of loosening.

[0009] Furthermore, the cross-sections of the inner locking nut and the outer sealing nut are both T-shaped structures.

[0010] Further, it includes: a sealing ring, which is sleeved on the bearing. After the inner locking nut is tightly attached to the bearing, the inner locking nut squeezes the sealing ring. A groove is provided on the contact surface between the sealing ring and the inner locking nut, and a first maze is formed between the inner locking nut and the sealing ring.

[0011] Further, it comprises: a gland, the gland is sleeved on the electric spindle, and the gland is located between the outer sealing nut and the inner locking nut;

[0012] One side of the gland is in close contact with the inner locking nut, and the other side of the gland is in close contact with the outer sealing nut. A through hole for installing a fastener is provided on the gland, and the fastener passes through the outer sealing nut, the gland and the inner locking nut in sequence.

[0013] A second labyrinth is formed between the gland and the inner locking nut, and a third labyrinth is formed between the gland and the outer sealing nut.

[0014] Furthermore, a water-slinging ring is provided at the outer ring of the outer sealing nut.

[0015] Beneficial effects of the utility model:

[0016] The fasteners cause the teeth on the outer sealing nut and the inner locking nut to slightly deform with the teeth on the electric spindle, respectively, so as to loosen the inner locking nut and the outer sealing nut, thereby effectively preventing the bearing locking nut from loosening due to vibration during high-speed forward and reverse rotation of the electric spindle. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 It is a cutaway schematic diagram after the overall assembly provided by the utility model;

[0019] Figure 2 It is a three-dimensional schematic diagram of the outer sealing nut provided by the utility model;

[0020] Figure 3 It is a schematic cross-sectional view of the outer sealing nut provided by the utility model;

[0021] Figure 4 It is a three-dimensional schematic diagram of the inner locking nut provided by the utility model;

[0022] Figure 5 It is a cross-sectional schematic diagram of the inner locking nut provided by the utility model.

[0023] Figure numerals: 1 is an inner locking nut, 2 is an outer sealing nut, 3 is an electric spindle, 4 is a sealing ring, and 5 is a gland. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0025] See also Figures 1 to 5 , a double-nut locking structure, comprising: after the bearing is installed on the electric spindle 3, the limiting mechanism is sleeved on the electric spindle 3 to lock the bearing;

[0026] The limiting mechanism comprises: an inner locking nut 1 and an outer sealing nut 2; the cross sections of the inner locking nut 1 and the outer sealing nut 2 are both T-shaped structures;

[0027] The inner locking nut 1 is meshed with the thread on the electric spindle 3, and one side of the inner locking nut 1 is in close contact with the bearing;

[0028] The outer sealing nut 2 is meshed with the thread on the electric spindle 3, and one side of the outer sealing nut 2 is in close contact with the other side of the inner locking nut 1;

[0029] A fastener connected to the inner locking nut 1 is provided on the other side of the outer sealing nut 2. The fastener is used to connect the outer sealing nut 2 and the inner locking nut 1, and at the same time deform the teeth on the outer sealing nut 2 and the inner locking nut 1 and the electric spindle 3 to achieve the purpose of loosening.

[0030] The locking structure also includes: a sealing ring 4 and a gland 5;

[0031] The sealing ring 4 is sleeved on the bearing. After the inner locking nut 1 is tightly attached to the bearing, the inner locking nut 1 squeezes the sealing ring 4. A groove is provided on the contact surface between the sealing ring 4 and the inner locking nut 1. A first maze is formed between the inner locking nut 1 and the sealing ring 4.

[0032] The gland 5 is sleeved on the electric spindle 3, and the gland 5 is located between the outer sealing nut 2 and the inner locking nut 1;

[0033] One side of the gland 5 is in close contact with the inner locking nut 1, and the other side of the gland 5 is in close contact with the outer sealing nut 2. A through hole for installing a fastener is provided on the gland 5, and the fastener passes through the outer sealing nut 2, the gland 5 and the inner locking nut 1 in sequence.

[0034] A second labyrinth is formed between the gland 5 and the inner locking nut 1 , and a third labyrinth is formed between the gland 5 and the outer sealing nut 2 . A water-slinging ring is provided at the outer ring of the outer sealing nut 2 .

[0035] The main invention of the present application is that the front end bearing of the electric spindle is pre-tightened by means of the double nuts, and the front end bearing of the electric spindle is sealed by means of the pressure cover and the sealing ring in cooperation with the double nuts.

[0036] After the bearing is installed, install the sealing ring, then install the inner locking nut and lock the bearing, then install the gland, and finally install the outer sealing nut and connect it to the inner locking nut through the end screws (fasteners).

[0037] The first labyrinth seal is formed between the sealing ring and the inner locking nut, the second labyrinth seal is formed between the inner locking nut and the gland, and the third labyrinth seal is formed between the outer sealing nut and the gland. The overall labyrinth has axial and radial directions and different heights to form a whole to seal the bearing, and a water-slinging ring is designed on the outer circle of the outer sealing nut to facilitate liquid accumulation.

[0038] The outer sealing nut and the inner locking nut are connected by screws, which causes the matching teeth between the nut and the electric spindle to deform, thereby loosening the inner locking nut and the outer sealing nut, so that the bearing will not loosen when the electric spindle rotates forward and reverse at high speed.

[0039] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A double nut locking structure, characterized in that: include: After the bearing is installed on the electric spindle, the limiting mechanism is sleeved on the electric spindle to lock the bearing; The limiting mechanism comprises: an inner locking nut and an outer sealing nut; The inner locking nut is meshed with the thread on the electric spindle, and one side of the inner locking nut is in close contact with the bearing; The outer sealing nut is meshed with the thread on the electric spindle, and one side of the outer sealing nut is in close contact with the other side of the inner locking nut; A fastener connected to the inner locking nut is provided on the other side of the outer sealing nut. The fastener is used to connect the outer sealing nut and the inner locking nut, and at the same time deform the teeth of the outer sealing nut and the inner locking nut and the electric spindle to achieve the purpose of loosening.

2. The double nut locking structure according to claim 1, characterized in that: The cross sections of the inner locking nut and the outer sealing nut are both T-shaped structures.

3. The double nut locking structure according to claim 2, characterized in that: include: A sealing ring is sleeved on the bearing. After the inner locking nut is in close contact with the bearing, the inner locking nut squeezes the sealing ring. A groove is provided on the contact surface between the sealing ring and the inner locking nut, and a first maze is formed between the inner locking nut and the sealing ring.

4. The double nut locking structure according to claim 2, characterized in that: include: A gland, which is sleeved on the electric spindle and is located between the outer sealing nut and the inner locking nut; One side of the gland is in close contact with the inner locking nut, and the other side of the gland is in close contact with the outer sealing nut. A through hole for installing a fastener is provided on the gland, and the fastener passes through the outer sealing nut, the gland and the inner locking nut in sequence. A second labyrinth is formed between the gland and the inner locking nut, and a third labyrinth is formed between the gland and the outer sealing nut.

5. The double nut locking structure according to claim 1, characterized in that: A water-throwing ring is arranged at the outer ring of the outer sealing nut.

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