Pneumatic shifting fork device

Abstract

The utility model discloses a safe and reliable pneumatic shifting fork device capable of monitoring the working condition of piston movement at any time. The pneumatic shifting fork device mainly comprises a sensor, an air cylinder body, a piston, a sleeve, a spring, a shell, a base, a connecting rod, a shifting fork, a spline housing, a transmission shaft and a shifting gear. A sensor is arranged to detect the reciprocating motion condition of a piston, the safety and stability of the whole gear shifting device are monitored in real time, during gear shifting, air pressure is input into an air cylinder body and pushes the piston to move downwards, a connecting rod compresses a spring to move downwards, and meanwhile a shifting fork assembled on a sleeve moves downwards along with the sleeve; the service life of the piston and the service life of the spring are greatly prolonged through the vertical guiding function of the sleeve and the base, the situation that the gear shifting device breaks down due to clamping is avoided, and different transmission ratios can be achieved by configuring different gear shifting gears according to the requirement of a whole machine.

Description

Technical Field

[0001] The utility model relates to the field of shifting devices, in particular to a pneumatic shifting fork device. Background Art

[0002] Pneumatic shift fork type shift actuators are widely used in the field of transmissions. Their working principle is to use the atmospheric pressure entering the cylinder to push the piston to reciprocate in a straight line. The piston synchronously drives the shift fork to move, and the spline sleeve and the shift gear are engaged and separated by the shift fork. The traditional pneumatic shift fork mechanism cannot monitor the piston movement condition at any time. After frequent reciprocating motion of the piston, wear or high air pressure will cause damage to the actuator, which will lead to transmission failure and affect the normal operation of the equipment.

[0003] Therefore, a pneumatic shift fork device is proposed to solve the above problems. Utility Model Content

[0004] The purpose of the utility model is to provide a safe and reliable pneumatic shift fork device that can monitor the piston movement condition at any time. The device can realize different transmission ratios by configuring different shift gears according to the needs of the whole machine, and can monitor the safety and stability of the whole shift device in real time by configuring sensors to detect the reciprocating motion of the piston. The device has a compact structure, is easy to operate and maintain.

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0006] A pneumatic shift fork device, the device comprising a housing and a transmission shaft cavity, the housing being in communication with the transmission shaft cavity;

[0007] The upper and lower parts of the shell are openings, the upper opening of the shell is fixed to the cylinder body by bolt 1, and the lower opening of the shell is fixed to the base by bolt 2;

[0008] The cylinder body has a piston, and one side of the cylinder body has an air hole for injecting gas to push the piston to do work. The sensor is assembled on the cylinder body through an external thread, and the probe at the lower end of the sensor transmits a signal by contacting and separating with the piston.

[0009] A connecting rod is installed inside the housing, a sleeve is installed on the top of the connecting rod, and a spring is sleeved on the periphery of the connecting rod;

[0010] The base is a cylindrical structure, the connecting rod is pushed by the piston to move into the base, and the mouth of the base has a step against the spring;

[0011] The transmission shaft cavity has a rotatable transmission shaft, a spline sleeve is sleeved on the transmission shaft, the transmission shaft and the spline sleeve are connected by splines, the spline sleeve moves on the transmission shaft, a rotatable shift gear is installed at the bottom of the transmission shaft cavity, the lower part of the spline sleeve is circumferentially provided with external splines and meshes with the internal splines of the shift gear to rotate together;

[0012] An annular groove is circumferentially arranged on the upper part of the spline sleeve, a shift fork is arranged between the spline sleeve and the sleeve, one end of the shift fork is fixed to the lower end of the sleeve, and the other end is a fork head embedded in the annular groove.

[0013] As a further preferred solution, an O-ring is further provided in the piston groove of the cylinder body for sealing between the piston and the cylinder body.

[0014] As a further preferred solution, an O-ring 2 for sealing the inner cavity of the shell is provided at the connection between the cylinder body and the shell.

[0015] As a further preferred solution, a positioning shoulder is provided at the upper end of the sleeve to limit the axial displacement of the piston, thereby protecting the piston and the spring from damage caused by excessive air pressure.

[0016] The utility model has the following beneficial effects:

[0017] 1. The utility model has remarkable economic applicability, high material utilization rate, low scrap rate, and each component has a simple structure and is easy to process.

[0018] 2. The utility model can realize different transmission ratios by configuring different shift gears according to the needs of the whole machine, can meet the needs of different working conditions, and has the characteristics of high strength and long life.

[0019] 3. The utility model can monitor the safety and stability of the shifting device at any time through the sensor, which is safe, reliable and easy to maintain. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0021] Figure 2 It is a schematic diagram of a shift fork of the utility model.

[0022] Among them are: 1. Bolt 1; 2. Sensor; 3. Cylinder block; 4. Piston; 5. O-ring 1; 6. O-ring 2; 7. Sleeve; 8. Spring; 9. Housing; 10. Bolt 2; 11. Base. 12. Connecting rod; 13. Shift fork; 14. Spline sleeve; 15. Drive shaft; 16. Shift gear. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model; it is obvious that the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments of the utility model without making creative work are within the scope of protection of the utility model.

[0024] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "set / connected", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0025] like Figure 1 As shown, the device includes a housing 9 and a transmission shaft cavity, and the housing 9 is connected to the transmission shaft cavity; the upper and lower parts of the housing 9 are open, the upper opening of the housing 9 is fixed to the cylinder body 3 by a bolt 1, and the lower opening of the housing 9 is fixed to the base 11 by a bolt 2 10; the cylinder body 3 has a piston 4, and one side of the cylinder body 3 is provided with an air hole for injecting gas to push the piston 4 to do work; the housing 9 is equipped with a connecting rod 12, the top of the connecting rod 12 is equipped with a sleeve 7, and the outer periphery of the connecting rod 12 is covered with a spring 8; the base 1 1 is a cylindrical structure, the connecting rod 12 is pushed by the piston 4 to move into the base 11, and the base 11 has a step at its mouth to resist the spring 8; a rotatable transmission shaft 15 is provided in the transmission shaft cavity, a spline sleeve 14 is sleeved on the transmission shaft 15, the transmission shaft 15 and the spline sleeve 14 are connected by splines, the spline sleeve 14 moves on the transmission shaft 15, a rotatable shift gear 16 is installed at the bottom of the transmission shaft cavity, and an external spline is provided on the lower part of the spline sleeve 14 in the circumferential direction and meshes with the internal spline of the shift gear 16 to rotate together;

[0026] An annular groove is circumferentially provided on the upper part of the spline sleeve 14, and a shift fork 13 is provided between the spline sleeve 14 and the sleeve 7. One end of the shift fork 13 is fixed to the lower end of the sleeve 7, and the other end is a fork head embedded in the annular groove.

[0027] The device also includes a sensor 2, which is assembled on the cylinder body 3 through external threads. The probe at the lower end of the sensor 2 transmits signals through contact and separation with the piston 4.

[0028] The upper end of the sleeve 7 is provided with a positioning shoulder which can be used to limit the axial displacement of the piston 4 to avoid damage to the piston 4 and the spring 8 due to excessive air pressure. The connecting rod 12, the spring 8 and the upper and lower guiding effect of the sleeve 7 in the base 11 and the inner hole of the shell 9 can avoid failure of the shifting device due to jamming.

[0029] The cylinder body 3 of the device is sealed by an O-ring 5 arranged in the piston groove. The external air pressure is pressurized through the air inlet hole of the cylinder body 3, and the air pressure pushes the piston 4 to move downward. At this time, the O-ring 5 is used for sealing between the piston 4 and the cylinder body 3; the O-ring 2 6 is arranged at the cylinder body 3 and the shell 9. There is lubricating oil in the shell 9 for lubricating the gears. The O-ring 2 6 is mainly used to seal the inner cavity of the shell 9.

[0030] In the initial state, the outer spline of the transmission shaft 15 and the spline sleeve 14 rotate together, and the shift gear 16 does not move. When shifting, the outside world inputs air pressure into the cylinder body, and the air pressure pushes the piston 4 downward, and the piston 4 drives the sleeve 7 and the connecting rod 12 to compress the spring 8 and move downward. At the same time, the shift fork 13 assembled on the sleeve 7 moves downward, and then pushes the outer spline of the spline sleeve 14 to mesh with the inner spline of the shift gear 16 to achieve power transmission. At this time, the spline sleeve 14, the transmission shaft 15 and the shift gear 16 rotate together. When the shift is released, the outside air pressure is released, and the spring 8 assembled in the sleeve 7 and the base 11 is reset. The elastic force of the spring 8 pushes the connecting rod 11 to drive the piston 4 and the sleeve 7 to move upward, and then drives the shift fork 13 to move upward to achieve the disengagement of the outer spline of the spline sleeve 14 and the inner spline of the shift gear 16. During the entire shifting process, the sensor 2 probe transmits signals by contacting and disengaging with the piston 4, and monitors the safety and stability of the entire shifting device in real time.

[0031] The preferred embodiments of the present invention are described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, various equivalent transformations can be made to the technical scheme of the present invention, and these equivalent transformations all belong to the protection scope of the present invention.

Claims

1. A pneumatic shift fork device, characterized in that: The device comprises a housing (9) and a transmission shaft cavity, wherein the housing (9) is in communication with the transmission shaft cavity; The upper and lower parts of the shell (9) are open, the upper opening of the shell (9) is fixed to the cylinder body (3) by bolt 1 (1), and the lower opening of the shell (9) is fixed to the base (11) by bolt 2 (10); The cylinder body (3) has a piston (4) in it, and a gas hole is provided on one side of the cylinder body (3) for injecting gas to push the piston (4) to do work. The sensor (2) is assembled on the cylinder body (3) through an external thread, and the probe at the lower end of the sensor (2) transmits a signal by contacting and separating from the piston (4); The housing (9) is internally provided with a connecting rod (12), the top end of the connecting rod (12) is provided with a sleeve (7), and the outer periphery of the connecting rod (12) is provided with a spring (8); The base (11) is a cylindrical structure, the connecting rod (12) is pushed by the piston (4) to move into the base (11), and the mouth of the base (11) has a step that abuts against the spring (8); A rotatable transmission shaft (15) is provided in the transmission shaft cavity, a spline sleeve (14) is sleeved on the transmission shaft (15), the transmission shaft (15) and the spline sleeve (14) are connected via splines, the spline sleeve (14) moves on the transmission shaft (15), a rotatable shift gear (16) is installed at the bottom of the transmission shaft cavity, an outer spline is provided on the circumference of the lower part of the spline sleeve (14) and meshes with the inner spline of the shift gear (16) to rotate together; An annular groove is circumferentially provided on the upper part of the spline sleeve (14), a shift fork (13) is provided between the spline sleeve (14) and the sleeve (7), one end of the shift fork (13) is fixed to the lower end of the sleeve (7), and the other end is a fork head embedded in the annular groove.

2. A pneumatic shift fork device according to claim 1, characterized in that: An O-ring (5) is also provided in the piston groove of the cylinder body (3) for sealing between the piston (4) and the cylinder body (3).

3. A pneumatic shift fork device according to claim 1, characterized in that: The connection between the cylinder body (3) and the housing (9) is provided with an O-ring 2 (6) for sealing the inner cavity of the housing (9).

4. A pneumatic shift fork device according to claim 1, characterized in that: The upper end of the sleeve (7) is provided with a positioning shoulder to limit the axial displacement of the piston (4).

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