Axial limiting device for electric trigger and electric trigger

Abstract

The axial limiting device is characterized in that a wrench shaft can rotate around the central axis of the wrench shaft and can be installed in a shaft hole of a shell in a telescopic motion mode in the axial direction, one end of the wrench shaft is in driving connection with a driving mechanism, and the other end of the wrench shaft extends out of the shaft hole of the shell and is provided with a wrench head; the axial limiting device comprises a mounting seat suitable for being mounted on the shell; the shaft sleeve is arranged on the wrench shaft in a sleeving manner and is rotatably and axially mounted on the mounting seat in a limiting manner, the end part of the shaft sleeve extends out of the mounting seat and forms a stop part, and a stop matching part suitable for being impacted and stopped on the stop part is formed on the wrench shaft; when the wrench shaft retracts by the preset stroke in the axial direction, the wrench shaft can abut against the stopping part of the shaft sleeve through the stopping matching part so that axial impact force on the wrench shaft can be transmitted to the shaft sleeve and transmitted to the installation base through the shaft sleeve, and the wrench shaft can be prevented from impacting the driving mechanism in the axial direction.

Description

Technical Field

[0001] The utility model relates to the technical field of electric triggers, in particular to an axial limiting device for an electric trigger and the electric trigger. Background Art

[0002] The lower center plate is one of the components of the railway vehicle bogie. It connects the car body and the bogie and transmits the load. Usually, a torque wrench or electric trigger is used to install and tighten the bolts of the lower center plate of the railway freight car.

[0003] A Chinese utility model patent (CN219275706U) discloses a railway freight car lower center plate trigger. A motor and a reducer are provided in the housing as a driving mechanism. The output shaft of the motor is connected to the reducer, and the output shaft of the reducer is directly connected to a sleeve used to tighten the bolt. The sleeve rotates under the drive of the driving mechanism, and at the same time, the sleeve acting on the bolt can perform axial retraction motion relative to the housing, thereby tightening the bolt.

[0004] Due to the railway freight car lower center plate trigger in the above patent, when the sleeve retracts to the extreme position, the connecting shaft may axially impact the driving mechanism, which may easily cause damage to the driving mechanism and affect the service life of the electric trigger. Utility Model Content

[0005] The utility model provides an axial limiting device for an electric trigger and an electric trigger, which are used to transfer the axial impact force on the trigger shaft to the axial limiting device when the trigger shaft is axially retracted to the limit position relative to the housing, so as to prevent the trigger shaft from axially impacting the driving mechanism.

[0006] On the one hand, the utility model provides an axial limit device for an electric trigger, wherein a trigger shaft is mounted in an axial hole of a housing so as to be rotatable about its own central axis and axially telescopically movable. One end of the trigger shaft is drivingly connected to a drive mechanism, and the other end extends from the axial hole of the housing and is mounted with a trigger head. The axial limit device comprises:

[0007] A mounting seat, suitable for being mounted on the housing;

[0008] A shaft sleeve is sleeved on the pull shaft and is rotatably mounted on the mounting seat with an axial limit, wherein the end of the shaft sleeve extends out of the mounting seat and is formed with a stop portion, and the pull shaft is formed with a stop fitting portion suitable for impacting and stopping the stop portion;

[0009] When the pull shaft retracts axially to a preset stroke, the pull shaft can stop against the stop portion of the sleeve through the stop fitting portion, so as to transmit the axial impact force on the pull shaft to the sleeve and then from the sleeve to the mounting seat.

[0010] Optionally, the mounting seat has a mounting cavity for mounting a shaft sleeve, and a thrust bearing is provided between an end surface of the shaft sleeve away from the stop portion and an inner top wall of the mounting cavity.

[0011] Optionally, a radial bearing is sleeved on the shaft sleeve, and the radial bearing is located between the outer wall of the shaft sleeve and the inner wall of the installation cavity.

[0012] Optionally, the mounting base includes a shell and an end cover that are mounted and connected in a split manner, wherein one end of the shell is mounted and connected to the housing;

[0013] The installation cavity is opened at the other end of the housing, and the end cover is used to cover the axial end opening of the installation cavity.

[0014] Furthermore, the housing comprises:

[0015] an axial limiting portion, located on a side of the shaft sleeve away from the stop portion, and the thrust bearing is arranged between the shaft sleeve and the axial limiting portion;

[0016] The first mounting portion is sleeved outside the shaft sleeve, one end of the first mounting portion is connected to the axial limiting portion, and the other end is used to mount the end cover; the mounting cavity is jointly defined by the first mounting portion and the axial limiting portion.

[0017] Furthermore, the housing further comprises:

[0018] The second mounting portion is connected to the first mounting portion. The second mounting portion is sleeve-shaped and has an inner wall provided with an internal thread. The shell is correspondingly provided with an external thread. The second mounting portion is threadedly connected to the shell.

[0019] Optionally, the stop portion is defined by an end surface of the sleeve facing the wrench head.

[0020] Optionally, the stop fitting portion is defined by an end surface of the wrench facing the sleeve.

[0021] As another embodiment, the mounting seat has a mounting cavity for mounting a shaft sleeve, and a centripetal thrust bearing is provided between the shaft sleeve and the inner wall of the mounting cavity.

[0022] On the other hand, the utility model provides an electric trigger, which includes a trigger shaft and a shell for installing the trigger shaft. The trigger shaft can rotate around its own central axis and can be installed in the axial hole of the shell for axial telescopic movement. One end of the trigger shaft is driven and connected to the driving mechanism, and the other end extends from the axial hole of the shell and is installed with a trigger head; it also includes the axial limiting device for the electric trigger in the aforementioned embodiment.

[0023] Compared with the prior art, the advantages of the present invention are:

[0024] The axial limit device for the electric trigger in this embodiment is used to be installed on the housing of the electric trigger. When the trigger shaft retracts axially to the extreme position relative to the housing, the stop fitting portion on the trigger shaft will collide with the stop portion of the sleeve, so that the axial impact force on the trigger shaft is transmitted from the stop fitting portion to the sleeve, and then transmitted to the mounting seat through the sleeve, and then transmitted to the housing by the mounting seat.

[0025] In this way, the axial impact force on the trigger shaft can be transferred to the axial limiting device, and the axial limiting device and the shell absorb the axial impact force from the trigger shaft to prevent the trigger shaft from axially impacting the drive mechanism, so that the drive mechanism is not affected by the axial impact force of the trigger shaft, thereby protecting the electric trigger. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention will be described in more detail below based on embodiments with reference to the accompanying drawings.

[0027] Figure 1 It is a schematic diagram of the structure of an electric trigger with an axial limit device when the trigger shaft is extended for normal operation;

[0028] Figure 2 It is a schematic diagram of the structure of an electric trigger with an axial limit device when it is axially retracted to a preset stroke;

[0029] Figure 3 This is an exploded view of the axial limit device for the electric trigger.

[0030] Reference numerals:

[0031] 1. Mounting seat; 10. Mounting cavity; 11. Housing; 111. Axial limiting portion; 112. First mounting portion; 113. Second mounting portion; 1131. Internal thread; 12. End cap;

[0032] 2. Shaft sleeve; 21. Stopper;

[0033] 3. Thrust bearing; 4. Centripetal bearing; 5. Connector; 6. Roofing felt;

[0034] 100, housing; 200, pull shaft; 300, pull head; 301, stop fitting portion; 400, driving mechanism. DETAILED DESCRIPTION

[0035] The present invention will be further described below with reference to the accompanying drawings.

[0036] On the one hand, an embodiment of the present invention provides an axial limiting device for an electric trigger, and the axial limiting device includes a mounting seat 1 and a shaft sleeve 2 .

[0037] Mounting base 1 is used to mount sleeve 2 and is suitable for installation on housing 100 of the electric trigger. The trigger shaft 200 of the electric trigger is installed within the axial hole of housing 100. The trigger shaft 200 can rotate about its central axis and move axially within the axial hole. One end of the trigger shaft 200 is connected to a drive mechanism 400, which is used to drive the trigger shaft 200 for rotation. The other end of the trigger shaft 200 extends from the axial hole of housing 100 and is mounted with a trigger head 300. Optionally, the trigger shaft 200 in this embodiment is a splined shaft.

[0038] The sleeve 2 is sleeved on the pull shaft 200 and is rotatably axially limited and mounted on the mounting seat 1. The end of the sleeve 2 extends out of the mounting seat 1 and is formed with a stop portion 21. The pull shaft 200 is provided with a stop fitting portion 301 suitable for impact stopping on the stop portion 21; optionally, the stop portion 21 is defined by an end face of the sleeve 2 facing the wrench head 300; the stop fitting portion 301 is defined by an end face of the wrench head 300 facing the sleeve 2.

[0039] When the pull shaft 200 retracts axially to a preset stroke, Figure 2 As shown, the pull shaft 200 can be stopped on the stop portion 21 of the shaft sleeve 2 through the stop fitting portion 301 , so as to transmit the axial impact force on the pull shaft 200 to the shaft sleeve 2 and then from the shaft sleeve 2 to the mounting seat 1 .

[0040] The axial limiting device for the electric trigger in this embodiment is used to be installed on the housing 100 of the electric trigger. When the trigger shaft 200 axially retracts to the extreme position relative to the housing 100, the stop fitting portion 301 will collide with and stop on the stop portion 21 of the sleeve 2, so that the axial impact force on the trigger shaft 200 is transmitted from the stop fitting portion 301 to the sleeve 2, and then transmitted to the mounting seat 1 through the sleeve 2, and then transmitted from the mounting seat 1 to the housing 100.

[0041] In this way, the axial impact force on the trigger shaft 200 can be transferred to the axial limiting device, and the axial limiting device and the shell 100 absorb the axial impact force from the trigger shaft 200 to prevent the trigger shaft 200 from axially impacting the drive mechanism 400, so that the drive mechanism 400 is not affected by the axial impact force of the trigger shaft 200, thereby protecting the drive mechanism 400 of the electric trigger.

[0042] In this embodiment, the mounting seat 1 has a mounting cavity 10 for mounting the shaft sleeve 2 , and a thrust bearing 3 is provided between an end surface of the shaft sleeve 2 away from the stop portion 21 and an inner top wall of the mounting cavity 10 .

[0043] When the pull shaft 200 is axially retracted to the limit position relative to the housing 100 , the stop fitting portion 301 will hit the stop portion 21 of the sleeve 2 , causing the sleeve 2 to rotate on the mounting seat 1 together with the pull shaft 200 .

[0044] In this embodiment, the thrust bearing 3 only bears the axial force of the sleeve 2 but not the radial force, which can ensure that the pull shaft 200 only transmits the axial force but not the torque to the sleeve 2, ensuring the smooth rotation of the sleeve 2 and preventing the sleeve 2 from stopping after being subjected to the impact force and affecting the rotation of the pull shaft 200.

[0045] Preferably, the thrust bearing 3 is a thrust ball bearing.

[0046] Optionally, a radial bearing 4 is sleeved on the shaft sleeve 2, and the radial bearing 4 is located between the outer wall of the shaft sleeve 2 and the inner wall of the installation cavity 10. Preferably, the radial bearing 4 is a deep groove ball bearing.

[0047] In this embodiment, the inner wall of the shaft hole on the sleeve 2 is clearance-matched with the outer wall of the trigger shaft 200, and the clearance between the two is controlled to be 0.15mm to 0.2mm, ensuring that the sleeve 2 does not affect the rotation of the trigger shaft 200 during normal operation of the electric trigger.

[0048] Optionally, the mounting base 1 includes a split-mounted shell 11 and an end cover 12, wherein one end of the shell 11 is mounted and connected to the housing 100; the mounting cavity 10 is opened at the other end of the shell 11, and the end cover 12 is used to seal the axial end opening of the mounting cavity 10.

[0049] The end cover 12 and the housing 11 are installed and connected via a connecting piece 5 , and the threaded connecting piece 5 can be a screw or a bolt.

[0050] A felt 6 is provided between the outer wall of the sleeve and the gland for providing lubricating oil to the thrust ball bearing and the radial bearing 4 located in the mounting cavity 10 .

[0051] In this embodiment, the housing 11 includes an axial limiting portion 111 , a first mounting portion 112 , and a second mounting portion 113 that are integrally connected.

[0052] The axial limiting portion 111 is located on the side of the shaft sleeve 2 away from the stop portion 21 , and the thrust bearing 3 is arranged between the shaft sleeve 2 and the axial limiting portion 111 ;

[0053] The first mounting portion 112 is sleeved on the outside of the shaft sleeve 2. One end of the first mounting portion 112 is connected to the axial limiting portion 111, and the other end is used to mount the end cover 12. The mounting cavity 10 is defined by the first mounting portion 112 and the axial limiting portion 111.

[0054] The second mounting portion 113 is sleeve-shaped and has an inner wall provided with an internal thread 1131 . The housing 100 is correspondingly provided with an external thread. The second mounting portion 113 is threadedly connected to the housing 100 .

[0055] As another embodiment, the mounting seat 1 has a mounting cavity 10 for mounting the shaft sleeve 2 , and a centripetal thrust bearing (not shown in the figure) is provided between the shaft sleeve 2 and the inner wall of the mounting cavity 10 .

[0056] On the other hand, an embodiment of the present invention provides an electric trigger, which includes a trigger shaft 200 and a shell 100 for installing the trigger shaft 200. The trigger shaft 200 can rotate around its own central axis and can be installed in the axial hole of the shell 100 for axial telescopic movement. One end of the trigger shaft 200 is connected to the driving mechanism 400, and the other end extends from the axial hole of the shell 100 and is installed with a trigger head 300; it also includes the axial limiting device for the electric trigger in the aforementioned embodiment.

[0057] The driving mechanism 400 includes a motor and a reducer connected between the motor and the pull shaft 200. Preferably, the reducer is a planetary gear reducer.

[0058] While the present invention has been described with reference to preferred embodiments, various modifications may be made and equivalent components may be substituted without departing from the scope of the present invention. In particular, the various technical features described in the various embodiments may be combined in any manner, provided no structural conflicts exist. The present invention is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions within the scope of the claims.

Claims

1. An axial limit device for an electric trigger, characterized in that: The pull shaft is rotatable about its own central axis and is installed in the shaft hole of the housing so as to be axially telescopically movable. One end of the pull shaft is connected to the driving mechanism, and the other end extends from the shaft hole of the housing and is provided with a pull head. The axial limiting device includes: A mounting seat, suitable for being mounted on the housing; A shaft sleeve is sleeved on the pull shaft and is rotatably mounted on the mounting seat with an axial limit, wherein the end of the shaft sleeve extends out of the mounting seat and is formed with a stop portion, and the pull shaft is formed with a stop fitting portion suitable for impacting and stopping the stop portion; When the pull shaft retracts axially to a preset stroke, the pull shaft can stop against the stop portion of the sleeve through the stop fitting portion, so as to transmit the axial impact force on the pull shaft to the sleeve and then from the sleeve to the mounting seat.

2. The axial limiting device for an electric trigger according to claim 1, characterized in that: The mounting seat has a mounting cavity for mounting a shaft sleeve, and a thrust bearing is arranged between an end surface of the shaft sleeve away from the stop portion and an inner top wall of the mounting cavity.

3. The axial limiting device for an electric trigger according to claim 2, characterized in that: A radial bearing is sleeved on the shaft sleeve, and the radial bearing is located between the outer wall of the shaft sleeve and the inner wall of the installation cavity.

4. The axial limiting device for an electric trigger according to claim 3, characterized in that: The mounting base includes a housing and an end cover that are mounted and connected in a split manner, wherein one end of the housing is mounted and connected to the shell; The installation cavity is opened at the other end of the housing, and the end cover is used to cover the axial end opening of the installation cavity.

5. The axial limiting device for an electric trigger according to claim 4, characterized in that: The housing comprises: an axial limiting portion, located on a side of the shaft sleeve away from the stop portion, and the thrust bearing is arranged between the shaft sleeve and the axial limiting portion; The first mounting portion is sleeved outside the shaft sleeve, one end of the first mounting portion is connected to the axial limiting portion, and the other end is used to mount the end cover; the mounting cavity is jointly defined by the first mounting portion and the axial limiting portion.

6. The axial limiting device for an electric trigger according to claim 5, characterized in that: The housing further comprises: The second mounting portion is connected to the first mounting portion. The second mounting portion is sleeve-shaped and has an inner wall provided with an internal thread. The shell is correspondingly provided with an external thread. The second mounting portion is threadedly connected to the shell.

7. The axial limiting device for an electric trigger according to claim 1, characterized in that: The mounting seat has a mounting cavity for mounting a shaft sleeve, and a centripetal thrust bearing is arranged between the shaft sleeve and the inner wall of the mounting cavity.

8. The axial limiting device for an electric trigger according to any one of claims 1 to 7, characterized in that: The stop portion is defined by an end surface of the sleeve facing the wrench.

9. The axial limiting device for an electric trigger according to claim 8, characterized in that: The stop fitting portion is defined by an end surface of the wrench facing the sleeve.

10. An electric trigger, characterized in that: It includes a trigger shaft and a shell for installing the trigger shaft, the trigger shaft can rotate around its own central axis and can be installed in the axial hole of the shell for axial telescopic movement, one end of the trigger shaft is connected to the driving mechanism, and the other end extends from the axial hole of the shell and is provided with a trigger head; it also includes an axial limiting device for the electric trigger according to any one of claims 1-9.

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