A magnetic encoder mounting structure for a forklift motor

Abstract

The utility model provides a kind of fork truck motor's magnetic encoder mounting structure, belong to fork truck motor technical field.It has solved the problem of higher installation difficulty of existing magnetic encoder mounting structure.The magnetic encoder mounting structure of this fork truck motor, including motor casing, motor spindle being passed in motor casing and end cover being fixedly connected on motor casing, one end of motor spindle is rotatably connected in end cover, magnetic encoder includes magnetic inductor and permanent magnet being arranged in one end of motor spindle, installation hole is set up on the outer end face of end cover, this mounting structure includes mounting cover, the end face of mounting cover is protruded to form positioning ring, positioning ring is embedded in installation hole and mounting cover is fixed on end cover by fastener, mounting plate is fixedly connected in mounting cover, magnetic inductor is fixed on mounting plate and is set up with permanent magnet opposite direction.This fork truck motor's magnetic encoder mounting structure only needs to guarantee the installation accuracy of end cover and mounting cover, to reduce the installation difficulty of magnetic encoder mounting structure.

Description

Technical Field

[0001] This utility model belongs to the field of forklift motor technology and relates to a magnetic encoder mounting structure for a forklift motor. Background Technology

[0002] When a forklift motor is running, a magnetic encoder needs to be installed outside the motor for control. The existing installation structure of the magnetic encoder results in large gaps at the connection and poor sealing, which makes it easy for dust to enter the interior from the connection, affecting the working environment of the magnetic encoder and affecting its service life.

[0003] Existing motor magnetic encoder mounting structures, such as the one disclosed in Chinese patent application [Authorization Announcement No.: CN106451928A], describe a permanent magnet brushless DC motor with a magnetic encoder. The motor is characterized by comprising a housing, a control board, a rotor, and a stator sleeved on the outside of the rotor. The housing includes a front cover, a rear cover, and an outer cylinder, with the front and rear covers fixed to both ends of the outer cylinder. The control board is fixed at the center of the inner side of the front cover, and a magnetic encoder chip is disposed at the center of the control board, connected to the control board via a circuit. The stator includes a stator core and coil windings wound around it, with the stator core fixed inside the outer cylinder. The rotor includes a central shaft and a rotor disc, with a permanent magnet disposed on the rotor disc, and the rotor disc and central shaft are mounted coaxially. The central shaft is mounted on the front and rear covers via bearings, and is coaxially mounted. A cylindrical permanent magnet is embedded at the center of the front end of the central shaft, with the front end face of the cylindrical permanent magnet close to but not touching the magnetic encoder chip.

[0004] The above structure places the magnetic encoder chip at the center of the control board, which is then fixed to the inner center of the front cover. The front cover and the outer cylinder are connected by fasteners. Since the cylindrical permanent magnet on the central shaft needs to be aligned with the magnetic encoder chip, the installation accuracy is high. Therefore, to ensure installation along the same central axis, the central shaft is mounted on the front cover via bearings. This means that the front cover must not only connect to the outer cylinder but also accommodate the installation of the central shaft, increasing the installation difficulty of the front cover. Utility Model Content

[0005] The purpose of this utility model is to address the aforementioned problems in the existing technology by proposing a magnetic encoder mounting structure for forklift motors. The technical problem to be solved by this utility model is how to solve the problem of the high installation difficulty of the existing magnetic encoder mounting structures.

[0006] The objective of this utility model can be achieved through the following technical solutions:

[0007] A magnetic encoder mounting structure for a forklift motor includes a motor housing, a motor spindle passing through the motor housing, and an end cover fixedly connected to the motor housing. One end of the motor spindle is rotatably connected to the end cover. The magnetic encoder includes a magnetic sensor and a permanent magnet disposed at one end of the motor spindle. The end cover has an outer end face with a mounting hole. The mounting structure includes a mounting cover with a protruding end face forming a positioning ring. The positioning ring is embedded in the mounting hole, and the mounting cover is fixed to the end cover by fasteners. A mounting plate is fixedly connected inside the mounting cover, and the magnetic sensor is fixed to the mounting plate and positioned opposite the permanent magnet.

[0008] The end cover is fixed to the motor housing, and the motor spindle is mounted on the motor housing. One end of the motor spindle is rotatably connected to the end cover. A mounting hole is provided on the outer end face of the end cover. The positioning ring on the mounting cover is inserted into the mounting hole of the end cover, achieving circumferential pre-positioning of the mounting cover and the end cover. The mounting cover and the end cover are connected by fasteners. A mounting plate is fixed inside the mounting cover, and the magnetic sensor is fixed on the mounting plate. A permanent magnet is provided at one end of the motor spindle, and the permanent magnet is positioned directly opposite the magnetic sensor for easy detection by the magnetic encoder. The insertion and engagement of the positioning ring and the mounting hole not only achieves pre-positioning but also provides a certain degree of sealing to prevent external dust. The new design features a mounting cover containing only a mounting plate and a magnetic sensor. This minimizes the number of parts after disassembly, facilitating subsequent maintenance. The structure ensures the mounting accuracy between the cover and the end cap through the cooperation of a positioning ring and mounting holes. By directly rotating one end of the motor shaft onto the end cap, the mounting cover only needs to be connected to the end cap during installation, unlike existing technologies that require the installation of the motor shaft as well. Instead, the end of the motor shaft is rotated to the end cap, and the magnetic sensor is mounted on the cover. Only the installation accuracy between the end cap and the mounting cover needs to be ensured, thus reducing the installation difficulty of the magnetic encoder mounting structure.

[0009] In the above-mentioned magnetic encoder mounting structure for forklift motors, the mounting cover has a mounting cavity, and the side wall of the mounting cover has a wire-passing hole communicating with the mounting cavity. The wire-passing hole is located on the outside of the mounting plate.

[0010] Since the magnetic sensor's wires need to be connected to external wires, a wire-passing hole is directly made on the side wall of the mounting cover, and the wire-passing hole is located on the outside of the mounting plate. When the wires pass through, the wire-passing hole is usually blocked. Even if a small amount of dust enters the mounting cavity, it will not adhere directly to the mounting plate. Furthermore, the magnetic sensor is located on the side facing the motor housing, so it is not easily affected, thus ensuring the normal operation of the magnetic encoder.

[0011] In the above-described magnetic encoder mounting structure for forklift motors, the mounting cover is cylindrical, the diameter of the mounting cover is larger than the diameter of the mounting hole, and the diameter of the mounting cavity is smaller than the diameter of the mounting hole.

[0012] The shape and size of the mounting cover are designed to make the internal cavity of the mounting cover smaller, while the mounting cover can abut against the end cap and be fixed to the end cap, thus improving the stability of the connection and the sealing effect.

[0013] In the above-described magnetic encoder mounting structure for forklift motors, there is a clearance gap between the outer wall of the mounting plate and the side wall of the mounting cavity.

[0014] This structure allows the mounting plate and the mounting cover to be connected only by fasteners, without any other limiting structures, which facilitates subsequent maintenance and removal.

[0015] In the above-described magnetic encoder mounting structure for forklift motors, the inner wall of the end cover is recessed to form an annular relief cavity, and the end cover protrudes radially within the relief cavity to form an annular mounting ring. One end of the motor spindle is supported on the mounting ring, and both the inner and outer end faces of the mounting ring have vibration damping gaps with the cavity wall of the relief cavity.

[0016] The mounting ring facilitates the insertion of one end of the motor spindle. However, since the motor spindle vibrates during operation, a vibration damping gap is provided to reduce the impact of the motor spindle on the mounting cover and improve installation stability in order to prevent the vibration of the motor spindle from affecting the mounting cover.

[0017] Compared with existing technologies, the magnetic encoder mounting structure of this forklift motor has the following advantages: the positioning ring and mounting holes ensure the installation accuracy of the mounting cover and end cover. Furthermore, by directly rotating one end of the motor spindle to the end cover, the mounting cover only needs to be connected to the end cover during installation. Unlike existing technologies, which also require the installation of the motor spindle, this structure allows the end of the motor spindle to be rotated and connected to the end cover, and the magnetic sensor to be mounted on the mounting cover. Only the installation accuracy of the end cover and the mounting cover needs to be ensured, thus reducing the installation difficulty of the magnetic encoder mounting structure. Attached Figure Description

[0018] Figure 1 This is a front view of the assembled version of this utility model.

[0019] Figure 2 yes Figure 1 Sectional view along the middle AA.

[0020] Figure 3 yes Figure 2 A magnified view of a portion of point A in the middle.

[0021] In the diagram, 1. Motor housing; 2. Motor spindle; 21. Permanent magnet; 3. End cover; 31. Mounting hole; 32. Relief cavity; 33. Mounting ring; 4. Mounting cover; 41. Positioning ring; 42. Mounting cavity; 43. Wire hole; 5. Magnetic sensor; 6. Fastener; 7. Mounting plate; 8. Relief gap; 9. Vibration damping gap. Detailed Implementation

[0022] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0023] like Figure 1 As shown, the magnetic encoder mounting structure of this forklift motor includes a motor housing 1, a motor spindle 2 passing through the motor housing 1, and an end cover 3 connected to the motor housing 1. One end of the motor spindle 2 is rotatably connected inside the end cover 3. The magnetic encoder includes a magnetic sensor 5 and a permanent magnet 21 disposed at one end of the motor spindle 2.

[0024] Specifically, such as Figure 1 and Figure 2 As shown, an installation hole 31 is provided on the outer end face of the end cover 3. The magnetic encoder mounting structure includes a mounting cover 4. The end face of the mounting cover 4 protrudes to form a positioning ring 41. The positioning ring 41 is embedded in the mounting hole 31 and the mounting cover 4 is fixed to the end cover 3 by fasteners 6. A mounting plate 7 is fixed inside the mounting cover 4. The magnetic sensor 5 is fixed on the mounting plate 7 and is positioned opposite to the permanent magnet 21.

[0025] The end cover 3 is fixedly connected to the motor housing 1, and the motor spindle 2 is inserted into the motor housing 1. One end of the motor spindle 2 is rotatably connected to the end cover 3. A mounting hole 31 is provided on the outer end face of the end cover 3. The positioning ring 41 on the mounting cover 4 is embedded into the mounting hole 31 of the end cover 3, realizing the circumferential pre-positioning of the mounting cover 4 and the end cover 3. The mounting cover 4 and the end cover 3 are connected by fasteners. A mounting plate 7 is fixed inside the mounting cover 4, and the magnetic sensor 5 is fixed on the mounting plate 7. A permanent magnet 21 is provided at one end of the motor spindle 2. The permanent magnet 21 is positioned opposite the magnetic sensor 5 to facilitate the detection of the magnetic encoder. The insertion and cooperation of the positioning ring 41 and the mounting hole 31 not only achieves the pre-positioning effect, but also provides a certain sealing effect. To prevent the entry of external dust, the mounting cover 4 only contains the mounting plate 7 and the magnetic sensor 5. This means that there are few parts after the mounting cover 4 is disassembled, which facilitates subsequent maintenance. The above structure ensures the installation accuracy of the mounting cover 4 and the end cover 3 through the cooperation of the positioning ring 41 and the mounting hole 31. Furthermore, by directly rotating one end of the motor spindle 2 onto the end cover 3, the mounting cover 4 only needs to be connected to the end cover 3 during installation. Unlike existing technologies, which also require the installation of the motor spindle 2, the end of the motor spindle 2 is rotated and connected to the end cover 3, and the magnetic sensor 5 is installed on the mounting cover 4. Only the installation accuracy of the end cover 3 and the mounting cover 4 needs to be ensured, thereby reducing the installation difficulty of the magnetic encoder mounting structure.

[0026] like Figure 2 and Figure 3 As shown, the mounting cover 4 has a mounting cavity 42, and a wire passage hole 43 communicating with the mounting cavity 42 is provided on the side wall of the mounting cover 4. The wire passage hole 43 is located on the outside of the mounting plate 7. The mounting cover 4 is cylindrical, and the diameter of the mounting cover 4 is larger than the diameter of the mounting hole 31. The diameter of the mounting cavity 42 is smaller than the diameter of the mounting hole 31. There is a clearance gap 8 between the outer wall of the mounting plate 7 and the side wall of the mounting cavity 42.

[0027] like Figure 3 As shown, the inner wall of the end cover 3 is recessed to form an annular mounting cavity 42. The end cover 3 protrudes radially within the mounting cavity 42 to form an annular mounting ring 33. One end of the motor spindle 2 is supported on the mounting ring 33. Both the inner and outer end faces of the mounting ring 33 have vibration damping gaps 9 with the cavity wall of the mounting cavity 42.

[0028] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A magnetic encoder mounting structure of a forklift motor, the forklift motor comprising a motor housing (1), a motor spindle (2) penetrating through the motor housing (1), and an end cover (3) fixed to the motor housing (1), one end of the motor spindle (2) being rotatably connected in the end cover (3), the magnetic encoder comprising a magnetic sensor (5) and a permanent magnet (21) arranged at one end of the motor spindle (2), characterized in that, The outer end face of the end cover (3) is provided with a mounting hole (31), the mounting structure comprises a mounting cover (4), the end face of the mounting cover (4) is provided with a positioning ring (41), the positioning ring (41) is embedded into the mounting hole (31), and the mounting cover (4) is fixed on the end cover (3) through fasteners (6); the mounting cover (4) is fixedly connected with a mounting plate (7), and the magnetic inductor (5) is fixed on the mounting plate (7) and is arranged opposite to the permanent magnet (21).

2. The magnetic encoder mounting structure for a forklift motor according to claim 1, characterized by, The mounting cover (4) is provided with a mounting cavity (42), the side wall of the mounting cover (4) is provided with a wire hole (43) in communication with the mounting cavity (42), and the wire hole (43) is located outside the mounting plate (7).

3. The magnetic encoder mounting structure for a forklift motor according to claim 2, characterized by, The mounting cover (4) is in a cylindrical shape, the diameter of the mounting cover (4) is greater than the diameter of the mounting hole (31), and the diameter of the mounting cavity (42) is smaller than the diameter of the mounting hole (31).

4. The magnetic encoder mounting structure for a forklift motor according to claim 2 or 3, characterized by, The outer side wall of the mounting plate (7) and the side wall of the mounting cavity (42) are provided with a gap (8).

5. The magnetic encoder mounting structure for a forklift motor according to claim 1 or 2 or 3, characterized by, The inner side wall of the end cover (3) is concave to form an annular gap cavity (32), the end cover (3) is radially provided with a mounting ring (33) in the gap cavity (32), one end of the motor main shaft (2) is supported on the mounting ring (33), and the inner and outer end faces of the mounting ring (33) and the cavity wall of the gap cavity (32) are provided with a damping gap (9).

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