Driving shaft composition for hand brake

Abstract

Disclosed in the present invention is a driving shaft composition for a hand brake. The driving shaft composition comprises a transmission shaft, and a planetary gear train, a primary clutch mechanism and a secondary clutch mechanism which are sequentially arranged on the transmission shaft, wherein two ends of the transmission shaft are mounted on a hand brake housing by means of bearings, and a transmission gear is fixedly mounted on the transmission shaft; the planetary gear train is located at a transmission gear on the transmission shaft and comprises a gear ring fixed to the hand brake housing, a planetary carrier sleeved on the transmission shaft, and three groups of planetary gears meshing with the gear ring and the transmission gear; the primary clutch mechanism is located at a thread of the transmission shaft and is of a friction clutch structure; the secondary clutch mechanism is located at a polished rod at the rear portion of the transmission shaft and is of an embedded rapid clutch structure; and a pinion is provided as a driving output gear of the hand brake. In the driving shaft composition for the hand brake of the present invention, a planetary gear train structure is used, so as to realize coaxial amplification of an input force by a driving shaft for the hand brake, and realize multiple factors of amplification of the input force with a small space, and different transmission ratios can also be obtained by adjusting tooth number configuration of the planetary gear train.

Description

A hand brake driving shaft component Technical Field

[0001] The invention belongs to the technical field of railway freight car design, in particular to the technical field of railway freight car component design, and relates to a hand brake driving shaft assembly. Background Art

[0002] Currently, my country's railway freight cars primarily use FSW and NSW / NSW-I handbrakes. The FSW handbrake has a chain output force of 10kN at an input torque of 156N·m, while the NSW / NSW-I handbrake has a chain output force of 9kN at an input torque of 140N·m. Both are standard-capacity handbrakes, with their active shafts primarily consisting of a drive shaft, clutch, and pinion. Their inherent transmission ratio is 1, meaning they cannot amplify input force. Their primary function is to transmit or cut off input force.

[0003] With the development of heavy-duty railway freight car technology, the gross weight of vehicles continues to increase. As one of the main means of safely parking vehicles, the parking capacity requirements of vehicle handbrakes are also becoming increasingly higher. Since there is currently no handbrake with a larger chain output force, in order to ensure the vehicle's parking capacity, my country's railway freight cars, based on the use of FSW and NSW / NSW-I handbrakes, have improved the vehicle's parking capacity by adding a handbrake lever or movable pulley after the handbrake chain. Although this improves the vehicle's parking capacity, the chain engagement also increases, and the chain stacks up in the handbrake, resulting in a significant reduction in the handbrake chain output force. Therefore, it is necessary to design a handbrake drive shaft with an input force amplification function, which can achieve an increase in the output force of the drive shaft with a smaller outer dimension, thereby increasing the chain output force of the entire handbrake, improving the vehicle's parking capacity, and improving the handbrake chain output force without changing the chain engagement.

[0004] Summary of the Invention

[0005] In view of the shortcomings of the prior art, the present invention discloses a hand brake driving shaft assembly. The purpose of the present invention is to provide a hand brake driving shaft assembly structure that can multiply the input force through the driving shaft assembly and transmit it to the next-level transmission mechanism, thereby increasing the output force of the hand brake chain.

[0006] The present invention is achieved through the following technical solutions:

[0007] A hand brake driving shaft assembly comprises: a transmission shaft, and a planetary gear train, a first-position clutch mechanism, and a second-position clutch mechanism sequentially arranged on the transmission shaft;

[0008] The two ends of the transmission shaft are mounted on the hand brake housing through bearings. A transmission gear is fixed on the transmission shaft. A thread is provided on the transmission shaft behind the transmission gear. The transmission shaft in front of the transmission gear and behind the thread is a polished rod.

[0009] The planetary gear train is located at the transmission gear position of the transmission shaft and includes: a ring gear fixed to the hand brake housing, a planet carrier mounted on the transmission shaft, three sets of planetary gears meshing with the ring gear and the transmission gear, and the three sets of planetary gears are rotatably connected to the front end surface of the planet carrier through bolts;

[0010] The first clutch mechanism is located at the transmission shaft thread position and is a friction clutch structure, comprising: a front friction plate provided on the rear end face of the planetary carrier, a ratchet wheel coupled to the friction plate at both the front and rear ends, a control wheel rotatably coupled to the transmission shaft thread, a rear friction plate provided on the coupling surface between the ratchet wheel and the control wheel, and the ratchet wheel limited in rotation by a pawl provided on the hand brake housing;

[0011] The two-position clutch mechanism is located at the rear polished rod position of the transmission shaft. It is an embedded quick clutch structure, including: a clutch that is rotationally coupled to the rear end of the control wheel and is mounted on a pinion on the transmission shaft; the clutch is controlled by a shift fork and can slide axially along the control wheel; the pinion is the output wheel driven by the hand brake, and a clutch groove that matches the clutch engagement protrusion is provided on the clutch mating surface.

[0012] Furthermore, the rear end face of the planetary carrier and the front joint surface of the ratchet are set to a matching front bevel ring, and the front friction plate is installed in the front bevel ring. The joint surface between the ratchet and the control wheel is set to a rear bevel ring that is radially symmetrical with the front bevel ring, and the rear friction plate is installed in the rear bevel ring; the front bevel ring and the rear bevel ring form a reducing structure that gradually narrows toward the axis.

[0013] Furthermore, three groups of bolt columns are symmetrically arranged on the front end surface of the planetary frame, and the three groups of planetary gears are respectively mounted on the bolt columns and are rotationally coupled to the bolt columns through bolt limiters.

[0014] Furthermore, the rear end shaft of the control wheel is a polygonal shaft, the clutch has a polygonal hole that matches the polygonal shaft to achieve rotation, and the clutch can slide axially along the polygonal shaft under the drive of the shift fork. In the present invention, the polygonal shaft and the polygonal hole are preferably matched regular hexagons.

[0015] Furthermore, the thread structure that movably connects the transmission shaft and the control wheel is a trapezoidal thread.

[0016] Furthermore, the clutch protrusions and clutch grooves are arranged in six pairs in a radially symmetrical manner.

[0017] The hand brake driving shaft of the present invention adopts a planetary gear system structure, which realizes the coaxial amplification of the input force by the hand brake driving shaft, realizes multiple amplification of the input force in a smaller space, and obtains different transmission ratios by adjusting the number of teeth of the planetary gear system. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] FIG1 is an exploded view of the driving shaft of the present invention;

[0019] FIG2 is a schematic diagram of a cross-sectional structure of a driving shaft according to the present invention;

[0020] FIG3 is a schematic diagram of the structure of a planetary gear system composed of a driving shaft according to the present invention;

[0021] FIG4 is a schematic diagram of the cross-sectional structure of the friction clutch composed of the driving shaft of the present invention;

[0022] FIG5 is a schematic structural diagram of a friction clutch composed of a driving shaft according to the present invention;

[0023] FIG6 is a schematic diagram of the cross-sectional structure of the driving shaft of the present invention comprising a quick clutch.

[0024] In the figure, 1 is the ring gear, 2 is the transmission shaft, 3 is the bolt, 4 is the transmission gear, 5 is the planetary gear, 6 is the planetary carrier, 7 is the friction plate, 8 is the ratchet, 9 is the pawl, 10 is the control wheel, 11 is the clutch, 12 is the shift fork, 13 is the pinion, 14 is the end shaft, A is the planetary gear train, B is the one-position clutch mechanism, and C is the two-position clutch mechanism. DETAILED DESCRIPTION

[0025] The present invention is further described below in conjunction with specific embodiments. The specific embodiments are further explanations of the principles of the present invention and do not limit the present invention in any way. Technologies that are the same or similar to the present invention do not exceed the scope of protection of the present invention.

[0026] Refer to Figures 1 to 6.

[0027] As shown in the figure, the driving shaft of the hand brake of the present invention comprises: a transmission shaft 2, and a planetary gear train A, a first-position clutch mechanism B, and a second-position clutch mechanism C arranged on the transmission shaft 2 in sequence.

[0028] Both ends of the transmission shaft 2 are mounted on the hand brake housing through bearings. A transmission gear 4 is fixed on the transmission shaft 2. A thread is provided on the transmission shaft 2 behind the transmission gear 4. The transmission shaft 2 in front of the transmission gear 4 and behind the thread is a smooth rod.

[0029] The planetary gear train A is located at the transmission shaft 2 and the transmission gear 4, and includes: a ring gear 1 fixed to the hand brake housing, a planetary carrier 6 mounted on the transmission shaft 2, three sets of planetary gears 5 meshing with the ring gear 1 and the transmission gear 4, and the three sets of planetary gears 5 are rotatably connected to the front end surface of the planetary carrier 6 by bolts 3.

[0030] A clutch mechanism B is located at the threaded position of the transmission shaft 2 and is a friction clutch structure, comprising: a front friction plate 7 arranged on the rear end face of the planetary carrier 6, a ratchet 8 coupled to the friction plate 7 at both the front and rear ends, a control wheel 10 rotatably coupled to the thread of the transmission shaft 2, a rear friction plate 7 being provided on the coupling surface between the ratchet 8 and the control wheel 10, and the ratchet 8 being limited in rotation by a pawl 9 provided on the housing of the hand brake.

[0031] The two-position clutch mechanism C is located at the rear polished rod position of the transmission shaft 2. It is an embedded quick clutch structure, including: a clutch 11 that is rotationally coupled to the rear end of the control wheel 10 and is mounted on a pinion 13 on the transmission shaft 2; the clutch 11 is controlled by a shift fork 12 and can slide axially along the control wheel 10; the pinion 13 is the output wheel driven by the hand brake, and the mating surface between the pinion 13 and the clutch 11 is provided with a clutch groove that matches the clutch protrusion of the clutch 11.

[0032] As shown in the figure, a transmission gear 4 is provided on the transmission shaft 2. The transmission gear 4, the planetary gear 5, the ring gear 1 and the planetary carrier 6 together constitute a planetary gear train A. The ring gear 1 is fixed to the hand brake housing, and the planetary gear 5 is installed on the planetary carrier 6 and fixed to the planetary carrier 6 by bolts 3. The transmission shaft 2 is used as the input and the planetary carrier 6 is used as the output. By adjusting the number of teeth of the ring gear 1, the transmission gear 4 and the planetary gear 5, different transmission ratios can be obtained to realize the input force amplification function.

[0033] The planet carrier 6 and the control wheel 10 are connected by a trapezoidal thread, with a friction plate 7 and a ratchet 8 in between. The ratchet 8 is controlled by a pawl 9 on the hand brake housing and can only rotate in the clockwise direction; when the transmission shaft 2 rotates clockwise, the planet carrier 6, friction plate 7, ratchet 8 and control wheel 10 are clamped by the thread to form a local integral structure, transmitting the force to the next level; when the transmission shaft 2 rotates counterclockwise, the thread is loosened, and the control wheel 10 rotates counterclockwise under the action of the chain tension, and the thread continues to be tightened until the chain tension disappears, realizing the stage relief function of the hand brake.

[0034] The control wheel 10 and the pinion 13 are connected by the clutch 11. When the clutch 11 is closed, the input force is transmitted from the control wheel 10 to the pinion 13 through the clutch 11. When the clutch 11 is disengaged, the transmission path between the control wheel 10 and the pinion 13 is cut off. Because the pinion 13 is engaged with the large gear of the hand brake, under the action of the chain tension, the large gear of the hand brake drives the pinion 13 to rotate rapidly, thereby achieving rapid release of the hand brake.

[0035] The end shaft 14 is fixed to the transmission shaft 2 and is used to limit the axial movement of parts assembled on the transmission shaft 2.

Claims

1. A hand brake driving shaft assembly, characterized in that: include: A transmission shaft, and a planetary gear train, a first-position clutch mechanism, and a second-position clutch mechanism sequentially arranged on the transmission shaft; Both ends of the transmission shaft are mounted on the hand brake housing through bearings, a transmission gear is fixedly mounted on the transmission shaft, a thread is arranged on the transmission shaft at the rear side of the transmission gear, and the transmission shaft at the front side of the transmission gear and the rear side of the thread is a bare rod; The planetary gear system is located at the transmission gear position of the transmission shaft, and includes: a gear ring fixed to the hand brake housing, a planet carrier mounted on the transmission shaft, three sets of planetary gears meshing with the gear ring and the transmission gear, and the three sets of planetary gears are rotationally connected to the front end surface of the planet carrier through bolts; The first clutch mechanism is located at the thread position of the transmission shaft, and is a friction clutch structure, including: a front friction plate arranged on the rear end face of the planet carrier, a ratchet wheel combined with the friction plate at both the front and rear ends, a control wheel rotatably combined with the thread of the transmission shaft, a rear friction plate is arranged on the joint surface of the ratchet wheel and the control wheel, and the ratchet wheel is limited in rotation by a pawl arranged on the housing of the hand brake; The two-position clutch mechanism is located at the rear polished rod position of the transmission shaft and is an embedded quick clutch structure, including: a clutch that is rotationally coupled to the rear end of the control wheel and is mounted on a pinion on the transmission shaft; the clutch is controlled by a shift fork and can slide axially along the control wheel; the pinion is the hand brake drive output wheel, and a clutch groove that matches the clutch engagement protrusion is provided on the clutch engagement surface.

2. The hand brake driving shaft assembly according to claim 1 is characterized in that: The rear end face of the planet carrier and the front joint surface of the ratchet are set to a matching front bevel ring, in which a front friction plate is installed; the joint surface of the ratchet and the control wheel is set to a rear bevel ring radially symmetrical with the front bevel ring, in which a rear friction plate is installed; a reducing structure is formed between the front bevel ring and the rear bevel ring, which gradually narrows toward the axis.

3. The hand brake driving shaft assembly according to claim 1 is characterized in that: The front end surface of the planet carrier is symmetrically provided with three groups of bolt columns, and the three groups of planetary gears are respectively sleeved on the bolt columns and rotatably connected with the bolt columns through bolt limiters.

4. The hand brake driving shaft assembly according to claim 1 is characterized in that: The rear end shaft of the control wheel is a polygonal shaft, the clutch has a polygonal hole that matches the polygonal shaft to realize rotation, and the clutch can slide axially along the polygonal shaft under the drive of the shift fork.

5. The hand brake driving shaft assembly according to claim 4, characterized in that: The polygonal axis and the polygonal hole are matching regular hexagons.

6. The hand brake driving shaft assembly according to claim 1, characterized in that: The thread structure of the transmission shaft and the control wheel that are movably connected is a trapezoidal thread.

7. The hand brake driving shaft assembly according to claim 1, characterized in that: The clutch protrusions and clutch grooves are arranged in six pairs in a radially symmetrical manner.

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