Point position fit type speed sensor base

Abstract

The utility model relates to the technical field of rail transit speed sensing, in particular to a point position fit type speed sensor base. The device comprises a main bearing seat, a flange plate, a large bearing, a small bearing, a locking nut, a lock washer and a damping bushing, a plurality of locking grooves are annularly arrayed in the outer wall of the locking nut, a first glue filling groove is formed in the middle of a bearing bin, where the large bearing is installed, of the flange plate, and a second glue filling groove is formed in the middle of a bearing bin, where the small bearing is installed, of the flange plate. According to the utility model, the OPG damping bushing adopts a half block cold pressing assembly process, all accessories are not subjected to crosslinking treatment, the function characteristic of torsion resistance is highlighted, and the metal inner ring is designed into a structure with horn mouths on two sides, so that the axial movement resistance and the torsion resistance of the metal inner ring under the action of impact vibration can be enhanced, and the service life of the metal inner ring is prolonged. Meanwhile, the contact area of the metal inner ring and the M10 flat gasket is increased, and the situation that the bolt is loosened due to the fact that the pretightening force of the bolt is reduced due to sliding abrasion caused by the too small contact area is prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of rail transit speed sensing, in particular to a point-matching speed sensor base. Background Art

[0002] The base of a subway vehicle speed sensor is an important component for installing and supporting the speed sensor. The base's main function is to provide stable and reliable support, ensuring that the speed sensor can be accurately installed on the axle end of the subway vehicle. During subway vehicle operation, the speed sensor base flange is installed on the axle end of the subway vehicle wheelset. The anti-rotation arm on the vehicle bogie is connected to the shock-absorbing bushing of the main bearing seat of the OPG speed sensor base to ensure the stability of the speed sensor body during vehicle operation. The speed sensor on the base generates a pulse frequency signal by detecting the wheel rotation speed. This signal is transmitted to the vehicle's control system to control the vehicle's speed and operating status. Regarding the base of the subway vehicle speed sensor, Chinese Patent Application No. 201420551425.7 discloses a base for installing a subway vehicle speed sensor.

[0003] However, the following faults often occur in the use of the base installed in subway vehicle speed sensors: the outer ring of the bearing wears the inner wall of the bearing compartment where the OPG speed sensor base flange is installed, causing the outer ring of the bearing to creep when the OPG speed sensor base flange rotates, leading to bearing failure; the connection between the locking nut and the rolled tongue stop washer is not firm, and the locking teeth of the rolled tongue stop washer often fall out of the locking groove of the locking nut, causing fastener failure; the torsion and tear resistance of the rubber layers of the inner and outer rings of the shock-absorbing bushing of the OPG speed sensor base are weak, and the rubber vulcanized layers of the inner and outer rings of the shock-absorbing bushing are prone to tearing or crushing. In view of this, we propose a point-matching speed sensor base. Utility Model Content

[0004] The purpose of the present utility model is to provide a point-matching speed sensor base to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides a point-matching speed sensor base, including a main bearing seat, a flange, a large bearing, a small bearing, a locking nut, a stop washer and a shock-absorbing bushing. The outer wall of the locking nut has a ring array with several locking grooves. The large bearing and the flange are installed in the large-diameter groove of the flange with an interference fit, and the small bearing and the flange are installed in the small-diameter groove of the flange with an interference fit, wherein: a first glue filling groove is provided in the middle of the bearing compartment of the flange for mounting the large bearing, and a second glue filling groove is provided in the middle of the bearing compartment of the flange for mounting the small bearing.

[0006] As a further improvement of the present technical solution, the shock-absorbing bushing is composed of a metal inner ring, a rubber layer and a metal outer ring from the inside to the outside, wherein the metal inner ring is designed to be a bell-shaped structure at both ends.

[0007] As a further improvement of the present technical solution, the first glue filling groove and the second glue filling groove are both processed by turning processing technology, wherein: the first glue filling groove is set to a width of 5mm and a circle of bottom arc R2.5, and the second glue filling groove is set to a width of 4mm and a circle of bottom arc R2.

[0008] As a further improvement of this technical solution, the main bearing seat and the flange are connected into a whole through interference fit with the large bearing and the small bearing. The main bearing seat and the flange rotate relative to each other, and the flange is fixed and locked on the main bearing seat by a stop washer and a locking nut.

[0009] As a further improvement of the present technical solution, the upper surface of the flange is provided with mounting holes for fixing.

[0010] Compared with the prior art, the present invention has the following beneficial effects:

[0011] In the point-fitting speed sensor base, an adhesive with high bonding performance and elasticity after curing is evenly applied to the first glue filling groove and the second glue filling groove respectively, and then the large bearing and the small bearing are press-fitted. When the flange in the OPG speed sensor base rotates, the internal temperature of the bearing increases, and the OPG flange made of aluminum alloy and the large and small bearings made of bearing steel expand due to heat. The interference fit clearance between the inner wall of the bearing compartment of the OPG speed sensor base flange mounted bearing and the outer ring of the bearing becomes smaller. The adhesive with high bonding performance and elasticity after curing can well bond the inner wall of the bearing compartment of the OPG speed sensor base flange mounted bearing and the outer ring of the bearing together, thereby preventing the outer ring of the bearing from creeping and avoiding wear of the inner wall of the bearing compartment of the OPG speed sensor base flange mounted bearing, thereby solving the problem of bearing failure.

[0012] By adding four more locking grooves on the lock nut according to the angle of the locking teeth of the rolled tongue stop washer, when the lock nut is tightened, continue to apply torque. When one locking groove aligns with the locking teeth of one rolled tongue stop washer, there will definitely be a locking groove that aligns with the locking teeth of the other rolled tongue stop washer. This achieves a double locking effect, thereby solving the problem of loose connection between the lock nut and the rolled tongue stop washer, and the locking teeth of the rolled tongue stop washer often falling out of the locking groove of the lock nut, causing fastener failure.

[0013] By adopting the half block cold pressing assembly process for the OPG shock-absorbing bushing, no gluing is performed between the various accessories, highlighting its anti-torsion functional characteristics. The metal inner ring is designed to have a trumpet-mouth structure on both sides, which can strengthen the metal inner ring's resistance to axial movement under the action of impact and vibration and enhance its anti-torsion function. At the same time, the contact area between the metal inner ring and the M10 flat gasket is increased to prevent sliding wear due to too small contact area, which reduces the bolt preload and causes the bolt to loosen, thereby solving the problem of weak anti-torsion and tearing performance of the rubber layer of the inner and outer rings of the shock-absorbing bushing base of the OPG speed sensor, and the tearing or crushing of the rubber vulcanized layer of the inner and outer rings of the shock-absorbing bushing. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a three-dimensional schematic diagram of the overall structure of the utility model;

[0015] Figure 2 It is a schematic plan view of the overall structure of the utility model;

[0016] Figure 3 It is a schematic cross-sectional view of the overall structure of the present invention;

[0017] Figure 4 For the utility model Figure 3 Schematic diagram of the structure at A in the middle;

[0018] Figure 5 For the utility model Figure 3 Schematic diagram of the structure at point B.

[0019] The meaning of each number in the figure is:

[0020] 1. Main bearing seat; 2. Flange; 3. Large bearing; 4. Small bearing; 5. Locking nut; 6. Lock washer; 7. Shock-absorbing bushing; 50. Locking groove; 20. First glue-filling groove; 21. Second glue-filling groove; 70. Metal outer ring; 71. Rubber layer; 72. Metal inner ring; 23. Mounting hole. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] The base of the subway vehicle speed sensor is an important component for installing and supporting the speed sensor. The main function of the base is to provide stable and reliable support to ensure that the speed sensor can be accurately installed on the axle end of the subway vehicle. When the subway vehicle is in operation, the speed sensor base flange is installed on the axle end of the subway vehicle wheelset. The anti-rotation arm on the vehicle bogie is connected to the shock-absorbing bushing of the main bearing seat of the OPG speed sensor base to ensure the stability of the speed sensor body when the vehicle is running. The speed sensor on the base generates a pulse frequency signal by detecting the rotation speed of the wheel. The signal is transmitted to the vehicle's control system for controlling the vehicle's speed and operating status. For the base of the subway vehicle speed sensor, Chinese patent application No. 201420551425.7 discloses a base for installing a subway vehicle speed sensor.

[0023] See also Figure 1-Figure 5 As shown, this embodiment provides a point-matching speed sensor base, including a main bearing seat 1, a flange 2, a large bearing 3, a small bearing 4, a locking nut 5, a stop washer 6 and a shock-absorbing bushing 7. Taking into account that the outer rings of the large bearing 3 and the small bearing 4 will wear the inner wall of the bearing compartment where the flange 2 is installed, causing the outer rings of the large bearing 3 and the small bearing 4 to creep when the flange 2 of the OPG speed sensor base rotates, resulting in failure of the large bearing 3 and the small bearing 4. Therefore, the details are as follows: a ring array on the outer wall of the locking nut 5 has a plurality of locking grooves 50, the large bearing 3 and the flange 2 are interference fit and installed in the large-diameter groove of the flange 2, and the small bearing 4 and the flange 2 are interference fit and installed in the small-diameter groove of the flange 2, wherein: a first glue filling groove 20 is provided in the middle of the bearing compartment where the large bearing 3 is installed on the flange 2, and a second glue filling groove 21 is provided in the middle of the bearing compartment where the small bearing 4 is installed on the flange 2.

[0024] The improvement of this embodiment is that:

[0025] By evenly applying an adhesive with high bonding performance and elasticity after curing to the first glue filling groove 20 and the second glue filling groove 21 respectively, and then press-fitting the large bearing 3 and the small bearing 4, when the flange 2 in the OPG speed sensor base rotates, the internal temperature of the bearing increases, the OPG flange 2 made of aluminum alloy and the large and small bearings 4 made of bearing steel both expand due to heat, and the interference fit clearance between the inner wall of the bearing compartment of the OPG speed sensor base flange 2 for mounting the bearing and the outer ring of the bearing becomes smaller. The adhesive with high bonding performance and elasticity after curing can well bond the inner wall of the bearing compartment of the OPG speed sensor base flange 2 for mounting the bearing and the outer ring of the bearing, thereby preventing the outer ring of the bearing from creeping and avoiding wear of the inner wall of the bearing compartment of the OPG speed sensor base flange 2 for mounting the bearing, thereby solving the problem of bearing failure.

[0026] Considering that the anti-torsion and tearing resistance of the inner and outer rubber layers 71 of the shock-absorbing bushing 7 of the OPG speed sensor base are relatively weak, the rubber vulcanized layers of the inner and outer rings of the shock-absorbing bushing 7 are prone to tearing or crushing. Therefore, the shock-absorbing bushing 7 is composed of a metal inner ring 72, a rubber layer 71 and a metal outer ring 70 from the inside to the outside, wherein the metal inner ring 72 is designed to have a bell-shaped structure at both ends;

[0027] By adopting the half block cold pressing assembly process for the OPG shock-absorbing bushing 7, no gluing treatment is performed between the various accessories, thereby highlighting its anti-torsion functional characteristics. The metal inner ring 72 is designed to have a trumpet-shaped structure on both sides, which can strengthen the metal inner ring 72's resistance to axial movement under the action of impact and vibration and enhance its anti-torsion function. At the same time, the contact area between the metal inner ring 72 and the M10 flat gasket is increased to prevent sliding wear due to too small a contact area, which reduces the bolt preload and causes the bolt to loosen, thereby solving the problem of weak anti-torsion and anti-tearing performance of the inner ring and outer ring rubber layer 71 of the OPG speed sensor base, and the tearing or crushing of the rubber vulcanized layer of the inner ring and outer ring of the shock-absorbing bushing 7.

[0028] Secondly, the first glue filling groove 20 and the second glue filling groove 21 are both processed by turning technology, wherein: the first glue filling groove 20 is set to have a width of 5mm and a bottom arc R2.5, and the second glue filling groove 21 is set to have a width of 4mm and a bottom arc R2.

[0029] To further explain, the main bearing seat 1 and the flange 2 are connected into a whole through interference fit with the large bearing 3 and the small bearing 4. The main bearing seat 1 and the flange 2 rotate relative to each other, and the flange 2 is fixed and locked on the main bearing seat 1 by the retaining washer 6 and the locking nut 5.

[0030] In addition, mounting holes 23 for fixing are provided on the upper surface of the flange 2 , and the flange 2 is mounted and fixed on the axle end of the subway vehicle through the four mounting holes 23 .

[0031] When the point-matching speed sensor base of the utility model is used, the position where the shock-absorbing bushing 7 is installed is connected to the anti-rotation arm installed on the vehicle bogie through the shock-absorbing bushing 7. A plurality of threaded holes are provided on the main bearing seat 1 to connect with the speed sensor device. The flange plate 2 is fixed to the axle end of the subway vehicle through the four mounting holes 23.

[0032] It needs to be further explained that in order to further strengthen the resistance of the metal inner ring 72 of the OPG shock-absorbing bushing 7 to axial movement and torsion under the action of impact vibration, and to prevent the pre-tightening force of the OPG shock-absorbing bushing 7 mounting screw and the M10 locking nut 5 from decreasing during torsional movement, causing the screw and nut to loosen, the following accessories can be added to the process of installing the OPG speed sensor base: add two POM polyformaldehyde gaskets to prevent the axial movement of the metal inner ring 72 of the OPG shock-absorbing bushing 7; add a through hole for installing a back-off pin by drilling a through hole at the tail of the M10*45 hexagonal screw, and install a back-off pin.

[0033] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely preferred examples of the present invention and are not intended to limit the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and improvements fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A point-matching speed sensor base, comprising a main bearing seat (1), a flange (2), a large bearing (3), a small bearing (4), a locking nut (5), a stop washer (6) and a shock-absorbing bushing (7), characterized in that: The outer wall of the locking nut (5) has a plurality of locking grooves (50) in an annular array. The large bearing (3) is installed in the large-diameter groove of the flange (2) by interference fit with the flange (2). The small bearing (4) is installed in the small-diameter groove of the flange (2) by interference fit with the flange (2), wherein: A first glue filling groove (20) is provided in the middle of a bearing compartment where the large bearing (3) is mounted on the flange (2), and a second glue filling groove (21) is provided in the middle of a bearing compartment where the small bearing (4) is mounted on the flange (2).

2. The point-matching speed sensor base according to claim 1, characterized in that: The shock-absorbing bushing (7) is composed of a metal inner ring (72), a rubber layer (71), and a metal outer ring (70) from the inside to the outside, wherein the metal inner ring (72) is designed to have a bell-shaped structure at both ends.

3. The point-matching speed sensor base according to claim 1, characterized in that: The first glue filling groove (20) and the second glue filling groove (21) are both machined using a turning process, wherein the first glue filling groove (20) is set to have a width of 5 mm and a bottom arc of R2.5, and the second glue filling groove (21) is set to have a width of 4 mm and a bottom arc of R2.

4. The point-matching speed sensor base according to claim 1, characterized in that: The main bearing seat (1) and the flange (2) are connected to form a whole through interference fit with the large bearing (3) and the small bearing (4); the main bearing seat (1) and the flange (2) rotate relative to each other; the flange (2) is fixed and locked on the main bearing seat (1) through a stop washer (6) and a locking nut (5).

5. The point-matching speed sensor base according to claim 1, characterized in that: The upper surface of the flange (2) is provided with a mounting hole (23) for fixing.

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