A transfer vehicle with a normally closed brake mechanism

Abstract

This invention relates to the field of transfer vehicle technology, specifically to a transfer vehicle with a normally closed braking mechanism. The normally closed braking mechanism includes a toothed outer ring, a toothed inner ring, and a sliding sleeve. The toothed outer ring rotates synchronously with a directional wheel. The sliding sleeve is fixedly connected to the axle. The toothed inner ring is slidably fitted outside the sliding sleeve. The opposing end faces of the toothed inner and outer rings have protrusions and grooves. The normally closed braking mechanism also includes a push rod assembly and a brake handle. The push rod assembly includes a fixed housing, a push rod, and an elastic element. The first end of the push rod is connected to the toothed inner ring, and the brake handle is connected to the second end of the push rod via a brake cable. This normally closed braking mechanism is adaptable to the frame, axle, and tire structure of the transfer vehicle. Compared to existing simple handcarts, it can transport heavy goods. Furthermore, when the transport personnel do not operate the brake handle, the braking mechanism is in a normally closed braking state, preventing accidents caused by vehicle movement.

Description

Technical Field

[0001] This invention relates to the field of transfer vehicle technology, and specifically to a transfer vehicle with a normally closed braking mechanism. Background Technology

[0002] Currently, non-powered ammunition transport vehicles often require additional braking devices for parking. For example, the non-powered ammunition transport vehicle disclosed in Chinese utility model patent CN201457436U includes a frame and a tow bar connected to the front of the frame. The frame includes longitudinal beams and front and rear axles mounted on the longitudinal beams, with wheels installed at both ends of the front and rear axles. The front wheels are equipped with drum brakes, and the tow bar has an operating handle, which is typically connected to the drum brake via a brake cable. This braking mechanism is normally open; that is, when braking is needed, gripping the operating handle moves the brake cable, thereby controlling the drum brake to achieve braking. However, this normally open braking mechanism not only complicates the vehicle structure but also increases the risk of the vehicle rolling away if the operator forgets to use the brakes or if the vehicle is parked in a certain position and the operator is far away from the vehicle.

[0003] In response, Chinese utility model patent CN209382038U discloses a normally braked trolley, including a cargo tray, a handrail, and several wheels. At least one wheel has a brake disc that rotates synchronously with the wheel, and the surface of the brake disc has circumferentially distributed first through holes. A movable braking assembly is located next to the brake disc, comprising a mounting body, a locking rod mounted on the mounting body, and a first elastic reset member. The first elastic reset member can drive the head of the locking rod to insert into the first through hole of the brake disc, thus locking the brake disc from rotation. A brake control handle is hinged to the handrail, and the brake control handle is connected to the tail of the locking rod via a brake cable. The brake control handle can rotate and, through the brake cable, drives the locking rod to overcome the first elastic reset member, causing the head of the locking rod to retract from the first through hole of the brake disc. Under normal conditions, the locking rod is inserted into the first through hole under the elastic force of the first elastic reset member, preventing the wheel from rotating. When the brake control handle is pressed, the brake control handle pulls the brake cable, causing the locking rod to be pulled out of the first through hole, allowing the wheel to rotate normally.

[0004] Therefore, the aforementioned normally braked trolley will not move during loading and unloading of goods, and can be placed on slopes or steep slopes. As long as the person does not operate the brake control handle, the trolley will not move, successfully avoiding the accidental movement of the trolley when the transport personnel leave the trolley.

[0005] However, the aforementioned conventional braking trolley relies on a single locking lever for braking each wheel. This lever experiences significant stress, especially with heavy loads, and prolonged use can easily cause deformation, rendering it ineffective. Furthermore, this conventional braking trolley lacks an axle; the wheels are directly mounted to the bottom of the chassis via brackets. While its simple structure is suitable for transporting relatively light goods, designing, arranging, and installing the braking mechanism to be compatible with the structure of a frame, axles, and tires remains a challenge for technical personnel. Summary of the Invention

[0006] The purpose of this invention is to provide a transfer vehicle with a normally closed braking mechanism that is compatible with the vehicle's frame, axle, and tire structure, thereby solving the problem that existing braking mechanisms are only applicable to simple handcarts and cannot be used to transfer heavy goods.

[0007] To achieve the above objectives, the transfer vehicle with a normally closed braking mechanism in this invention adopts the following technical solution:

[0008] A transfer vehicle with a normally closed braking mechanism includes a frame, which includes longitudinal beams and two axles mounted on the longitudinal beams, one set of wheels and the other set of wheels being directional wheels. The transfer vehicle also includes a normally closed braking mechanism, which includes a toothed outer ring, a toothed inner ring, and a sliding sleeve. The toothed outer ring is fixed to the hub of the directional wheel or is integrally formed with the hub to rotate synchronously with the directional wheel. The sliding sleeve is directly or indirectly fixedly connected to the axle and is coaxial with the axle. The toothed inner ring is guided and slidably sleeved on the outside of the sliding sleeve in the left-right direction. The opposite end faces of the toothed inner ring and the toothed outer ring are provided with protrusions and grooves for interlocking to prevent rotation of the toothed inner ring and the toothed outer ring in the circumferential direction. The normally closed braking mechanism also includes a push rod assembly and a brake handle. The push rod assembly includes a fixed housing fixed to the longitudinal beam or axle, a push rod passing through the fixed housing, and an elastic element installed inside the fixed housing. The first end of the push rod is connected to the inner ring of the toothed brake, and the brake handle is connected to the second end of the push rod via a brake cable. The normally closed braking mechanism has a driving state in which the brake cable is tensioned and moved when the brake handle is gripped, thereby driving the push rod and the inner ring of the toothed brake to move synchronously and compress the elastic element, thereby moving the inner ring of the toothed brake away from the outer ring of the toothed brake so that the directional wheel can travel. It also has a braking state in which the push rod pushes the inner ring of the toothed brake to reset under the reaction force of the elastic element when the brake handle is released, so that the protrusion and the groove are engaged to brake the directional wheel.

[0009] The beneficial effects of the above technical solution are as follows: The normally closed braking mechanism of the transfer vehicle of the present invention includes a toothed brake outer ring, a toothed brake inner ring, and a sliding sleeve. The toothed brake outer ring is fixed on the hub of the directional wheel or is integrally set with the hub, so that it can rotate synchronously with the directional wheel. The sliding sleeve is directly or indirectly fixedly connected to the axle and is set coaxially with the axle, so that the sliding sleeve is fixed. The toothed brake inner ring is guided and slidably sleeved on the outside of the sliding sleeve in the left and right direction, so that the toothed brake inner ring can slide left and right along the sliding sleeve. The opposite end faces of the toothed brake inner ring and the toothed brake outer ring are provided with protrusions and grooves for interlocking and engaging to prevent the toothed brake inner ring and the toothed brake outer ring from rotating in the circumferential direction. When the protrusions and grooves are interlocked, the toothed brake inner ring and the toothed brake outer ring stop rotating in the circumferential direction, that is, the toothed brake inner ring can prevent the toothed brake outer ring from rotating, thereby realizing the braking of the directional wheel.

[0010] The normally closed braking mechanism also includes a push rod assembly and a brake handle. The push rod assembly includes a fixed housing, a push rod, and an elastic element. The fixed housing is fixed to the longitudinal beam or axle and is immovable. The elastic element is installed inside the fixed housing. The push rod passes through the fixed housing, and its first end is connected to the inner ring of the toothed brake. The brake handle is connected to the second end of the push rod via a brake cable. This allows the normally closed braking mechanism to have two working states: a driving state where, when the brake handle is gripped, the brake cable is tensioned and moves, thereby causing the push rod and the inner ring of the toothed brake to move synchronously and compress the elastic element, thus moving the inner ring of the toothed brake away from the outer ring of the toothed brake to allow the directional wheel to move; and a braking state where, when the brake handle is released, the push rod, under the reaction force of the elastic element, pushes the inner ring of the toothed brake back to its original position, allowing the protrusion and groove to engage and brake the directional wheel.

[0011] Therefore, the normally closed braking mechanism in this invention is compatible with the frame, axle, and tire structure of the transfer vehicle. Compared to existing simple handcarts, the transfer vehicle with its frame, axle, and tire structure can transport heavy goods. Furthermore, when the transfer vehicle is loading / unloading goods or placed on a slope or steep incline—that is, when the transport personnel are not operating the brake lever—the braking mechanism remains in a normally closed braking state, preventing accidents caused by vehicle movement. When movement is required, the transport personnel must firmly grip the brake lever, increasing safety.

[0012] Furthermore, the normally closed braking mechanism also includes a brake shaft tube, a sliding sleeve fitted and fixed to the outside of the brake shaft tube, an annular plate provided at the end of the brake shaft tube, a connecting structure provided on the annular plate for fixed connection with the axle, and the inner hole of the annular plate for the wheel mounting section at the end of the axle to pass through.

[0013] The beneficial effects of the above technical solution are as follows: by setting a brake axle tube, the sliding sleeve is fitted and fixed on the outside of the brake axle tube. At the same time, an annular plate is provided at the end of the brake axle tube, which facilitates the fixed connection between the brake axle tube and the axle, thereby indirectly realizing the fixation between the sliding sleeve and the axle. Meanwhile, the inner hole of the annular plate allows the wheel mounting section at the end of the axle to pass through, ensuring the normal installation of the wheel and the axle.

[0014] Furthermore, the sliding sleeve and the brake shaft tube are fixedly connected by a plurality of circumferentially arranged screws, and the inner wall of the sliding sleeve and the outer wall of the brake shaft tube are respectively provided with semi-threaded holes for engaging together to connect the screws.

[0015] The advantages of the above technical solution are that by machining a semi-threaded hole and using screws to achieve a fixed connection between the sliding sleeve and the brake shaft tube, both manufacturing and connection operations are relatively convenient.

[0016] Furthermore, the outer ring of the toothed brake includes an outer ring cylindrical section and an outer ring flange section. The outer ring flange section is fixedly connected to the spokes of the directional wheel by fasteners. A bearing is installed between the outer ring cylindrical section and the wheel mounting section. The outer ring cylindrical section is inserted into the brake shaft tube. The inner ring of the toothed brake includes an inner ring cylindrical section and an inner ring flange section. The protrusion is provided on one end face of the inner ring flange section and the outer ring flange section, and the groove is provided on the other end face.

[0017] The beneficial effects of the above technical solution are as follows: the outer ring flange section facilitates the fixed connection with the spokes of the directional wheel; the outer ring cylindrical section facilitates the assembly with the wheel mounting section; and the outer ring cylindrical section is inserted into the brake axle tube, making the structure more compact; the protrusions and grooves are respectively set on the opposite end faces of the inner ring flange section and the outer ring flange section, which facilitates the setting and processing of the protrusions and grooves.

[0018] Furthermore, the inner ring of the gear brake and the sliding sleeve are guided and slidably fitted by a flat key. The sliding sleeve is provided with a mounting groove for installing the flat key, and the inner surface of the inner ring of the gear brake is provided with a sliding groove that guides and slides with the flat key. The sliding groove is a through groove that runs from left to right.

[0019] The advantages of the above technical solution are: the machining of the mounting groove and the slide groove is relatively convenient through the sliding fit guided by the flat key, the structure is simplified, and the manufacturing difficulty is reduced.

[0020] Furthermore, at least three of the protrusions and grooves are evenly distributed circumferentially.

[0021] The beneficial effects of the above technical solution are as follows: the large number of protrusions and grooves can increase the number of anti-rotation parts and improve the anti-rotation effect; and during braking, it is easier to make the protrusions and grooves fit together, thereby improving braking efficiency.

[0022] Furthermore, the first end of the push rod is hinged to the inner ring of the toothed brake, and the outer circumferential surface of the inner ring of the toothed brake is provided with an ear plate for hinged connection with the first end of the push rod.

[0023] The beneficial effects of the above technical solution are as follows: the first end of the push rod is hinged to the inner ring of the toothed brake, which facilitates the connection operation between the two and allows for slight relative rotation between the push rod and the inner ring of the toothed brake to accommodate the assembly gap and avoid jamming.

[0024] Furthermore, a collar is provided on the outer periphery of the push rod, the fixed shell is cylindrical, one end of the fixed shell is provided with an inwardly extending inner protruding ring for stopping and engaging with one side end face of the collar, and the other end of the fixed shell is threadedly connected with an adjusting nut, and the two ends of the elastic element press against the adjusting nut and the other side end face of the collar, respectively.

[0025] The advantages of the above technical solution are: the push rod and the fixed shell have a simple structure and are easy to process and manufacture. The fixed shell has an inner convex ring at one end and an adjusting nut at the other end, which not only facilitates the installation of the push rod and the elastic element, but also allows for adjustment of the compression of the elastic element and adjustment of the appropriate braking effect.

[0026] Furthermore, a brake sleeve is fixed on the axle for the brake cable to pass through, and the brake cable hole on the brake sleeve is coaxial with the push rod.

[0027] The beneficial effect of the above technical solution is that by setting a brake sleeve through which the brake cable passes, and the brake cable hole on the brake sleeve is coaxial with the push rod, it is convenient for the brake cable to apply force and smoothly pull the push rod to move.

[0028] Furthermore, two sets of toothed brake outer ring, toothed brake inner ring, sliding sleeve and push rod assembly are provided symmetrically on the left and right, and are respectively arranged corresponding to two directional wheels in a set. Two brake sleeves and two brake lines are also provided. Fixing clips for limiting the brake lines are provided on the two longitudinal beams. The two brake lines pass through the corresponding brake sleeves in a cross shape and are connected to the corresponding push rods.

[0029] The beneficial effects of the above technical solution are as follows: both left and right directional wheels can achieve normally closed braking, which improves the braking effect of the whole vehicle. At the same time, the two longitudinal beams are respectively equipped with fixing clamps for limiting the brake lines. The two brake lines pass through the corresponding brake sleeves in a cross shape and are connected to the corresponding push rods. This makes the two brake lines set relatively far out and pass through the corresponding brake sleeves in a cross shape, which facilitates the movement of the corresponding push rods by the brake lines and reduces the movement resistance. Attached Figure Description

[0030] Figure 1 This is a bottom view of the transfer vehicle with a normally closed braking mechanism according to the present invention;

[0031] Figure 2 This is a partial structural diagram of the traction rod of the transfer vehicle with a normally closed braking mechanism according to the present invention;

[0032] Figure 3 This is a partial structural diagram of the rear wheel section of the transfer vehicle with a normally closed braking mechanism according to the present invention.

[0033] Figure 4 This is a structural diagram of the rear wheel of the transfer vehicle with a normally closed braking mechanism according to the present invention.

[0034] Figure 5 This is an exploded view of the rear wheel of the transfer vehicle with a normally closed braking mechanism according to the present invention.

[0035] Figure 6 This is a structural diagram of the toothed brake outer ring of the transfer vehicle with a normally closed braking mechanism of the present invention being fixed on the rear wheel.

[0036] Figure 7 for Figure 6 A cross-sectional view of the structure shown;

[0037] Figure 8 This is a cross-sectional view of the gear brake inner ring, sliding sleeve, and brake shaft tube of the transfer vehicle with a normally closed braking mechanism according to the present invention.

[0038] Figure 9 This is a structural diagram of the inner ring of the toothed brake of the transfer vehicle with a normally closed braking mechanism according to the present invention.

[0039] Figure 10 This is a cross-sectional view of the push rod assembly of the transfer vehicle with a normally closed braking mechanism according to the present invention.

[0040] In the diagram: 1. Longitudinal beam; 2. Front axle; 3. Front wheel; 4. Drawbar; 41. Handlebar; 5. Steering mechanism; 6. Rear axle; 7. Rear wheel; 71. Wheel spoke; 8. Front brake cable; 9. Rear brake cable; 10. Push rod assembly; 101. Mounting housing; 102. Push rod; 1021. Collar; 103. Spring; 104. Adjusting nut; 105. Adjusting screw; 11. Brake handle; 12. Brake sleeve; 13. Gear brake. Inner ring; 131, Inner ring flange section; 132, Inner ring cylindrical section; 133, Protrusion; 134, Ear plate; 135, Slide groove; 14, Slide sleeve; 141, Mounting groove; 15, Brake shaft tube; 151, Annular plate; 16, Toothed brake outer ring; 161, Outer ring flange section; 162, Outer ring cylindrical section; 163, Groove; 17, Screw; 18, Special screw; 19, Nut; 20, Bearing; 21, Flat key; 22, Fixing clamp. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the invention and are not intended to limit the invention; that is, the described embodiments are merely some embodiments of the invention, not all embodiments. The components of the embodiments of the invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0042] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0043] It should be noted that relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any actual relationship or order between these entities or operations. Furthermore, terms such as "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0044] The features and performance of the present invention will be further described in detail below with reference to embodiments.

[0045] An embodiment of the transfer vehicle (hereinafter referred to as the transfer vehicle) having a normally closed braking mechanism in this invention is as follows: Figure 1 As shown, the vehicle includes a frame and a tow bar 4 connected to the front of the frame. The frame includes a longitudinal beam 1 and a front axle 2 and a rear axle 6 mounted on the longitudinal beam 1. A set of front wheels 3 are mounted at both ends of the front axle 2, and a set of rear wheels 7 are mounted at both ends of the rear axle 6. The two rear wheels 7 are directional wheels, and the two front wheels 3 are steering wheels. The tow bar 4 is connected to the front axle 2 through a steering mechanism 5.

[0046] The transfer vehicle also includes a normally closed braking mechanism, such as... Figure 5As shown, the normally closed braking mechanism includes a toothed brake outer ring 16, a toothed brake inner ring 13, a sliding sleeve 14, and a brake shaft tube 15. The toothed brake outer ring 16 is integrally formed with the hub of the rear wheel 7, allowing it to rotate synchronously with the rear wheel 7. Specifically, the toothed brake outer ring 16 includes an outer ring flange section 161 and an outer ring cylindrical section 162. The outer ring flange section 161 is fixedly connected to the spokes 71 of the rear wheel 7 via fasteners (including a dedicated screw 18 and a nut 19). After fixing, it... Figure 6 and Figure 7 As shown.

[0047] The sliding sleeve 14 is a copper sliding sleeve, which is indirectly and fixedly connected to the rear axle 6 via the brake shaft tube 15 and is coaxially arranged with the rear axle 6. For example... Figure 4 and Figure 8 As shown, the sliding sleeve 14 is fitted and fixed to the outside of the brake shaft tube 15, in conjunction with... Figure 5 As shown, the sliding sleeve 14 and the brake shaft tube 15 are fixedly connected by a plurality of circumferentially arranged screws 17. Therefore, semi-threaded holes for engaging together to connect the screws 17 are respectively provided on the inner wall of the sliding sleeve 14 and the outer wall of the brake shaft tube 15. The axial direction of the semi-threaded holes is parallel to the axial direction of the sliding sleeve 14 and the brake shaft tube 15.

[0048] An annular plate 151 is provided at the end of the brake shaft tube 15. The annular plate 151 has a connecting structure for fixed connection with the fixing plate 61 on the rear axle 6. In this embodiment, the connecting structure consists of multiple connecting holes. The inner hole of the annular plate 151 allows the wheel mounting section (not shown in the figure) at the end of the rear axle 6 to pass through. The specific form of the wheel mounting section is similar to that in patent document CN201457436U. A bearing 20 (e.g., ...) is installed between the outer cylindrical section 162 of the toothed brake outer ring 16 and the wheel mounting section. Figure 7 As shown in the figure, the wheel can be rotated and installed, and the outer cylindrical section 162 is inserted into the brake axle tube 15, which makes the structure relatively compact.

[0049] The inner ring 13 of the gear brake is guided and slidably sleeved on the outside of the sliding sleeve 14 in the left-right direction. Specifically, as shown... Figure 5 and Figure 8 As shown, the inner ring 13 of the gear brake and the sliding sleeve 14 are guided and slidably engaged by a flat key 21. The sliding sleeve 14 is provided with a mounting groove 141 for mounting the flat key 21. The inner surface of the inner ring 13 of the gear brake is provided with a sliding groove 135 that is guided and slidably engaged with the flat key 21. The sliding groove 135 is a through groove that runs from left to right.

[0050] The inner ring 13 of the gear brake includes an inner ring flange section 131 and an inner ring cylindrical section 132, and the aforementioned groove 135 is provided on the inner wall of the inner ring cylindrical section 132. For example... Figure 9 As shown, a protrusion 133 is provided on the end face opposite to the outer flange section 161, and multiple protrusions 133 are evenly distributed circumferentially. Figure 5 and Figure 6 As shown, a groove 163 is provided on the end face opposite to the inner flange section 131 of the outer flange section 161. Multiple grooves 163 are also evenly distributed along the circumference. The protrusion 133 and the groove 163 are used to insert and fit together so that the inner ring 13 and the outer ring 16 of the toothed brake can stop rotation in the circumference. Therefore, the inner ring 13 of the toothed brake can prevent the outer ring 16 of the toothed brake from rotating, thereby achieving braking of the rear wheel 7.

[0051] like Figure 1 and Figure 3 As shown, the normally closed braking mechanism also includes a push rod assembly 10, combined with... Figure 4 and Figure 10 As shown, the push rod assembly 10 includes a fixed housing 101, a push rod 102, and an elastic element, which in this embodiment is a spring 103. The fixed housing 101 is cylindrical and is fixed to the longitudinal beam 1 and located below the longitudinal beam 1. The spring 103 is installed inside the fixed housing 101. The push rod 102 passes through the fixed housing 101. A collar 1021 is provided on the outer periphery of the push rod 102. One end of the fixed housing 101 is provided with an inwardly extending inner protruding ring for a stop engagement with one side end face of the collar. The other end of the fixed housing is threadedly connected to an adjusting nut 104. The two ends of the spring 103 press against the adjusting nut 104 and the other side end face of the collar, respectively. The compression of the spring 103 can be changed by adjusting the nut 104, thereby adjusting the restoring force of the braking mechanism.

[0052] The first end of the push rod 102 is connected to the inner ring 13 of the gear brake, specifically by hinge, therefore, as Figure 4 , Figure 5 , Figure 8 and Figure 9 As shown, a lug plate 134 is provided on the outer circumferential surface of the inner ring 13 of the gear brake for hinged connection with the first end of the push rod 102. There are two lug plates 134 arranged in parallel and spaced apart.

[0053] like Figure 2 As shown, the normally closed braking mechanism also includes a brake handle 11 and brake cables. The brake handle 11 is hinged to the lever 41 on the front side of the drawbar 4. The brake cables include a front brake cable 8 and two rear brake cables 9, as shown... Figure 1 and Figure 3 As shown. The front brake cable 8 is arranged along the structure of the tow bar 4, with one end connected to the brake handle 11 and the other end connected to the brake lever via a force transmission structure. Both rear brake cables 9 are connected to the brake lever, thus splitting the brake cables in two. Fixing clips 22 (as shown) are respectively installed on the two longitudinal beams 1 to limit the movement of the rear brake cables 9. Figure 1 (As shown).

[0054] like Figure 1 and Figure 3As shown, the aforementioned outer ring 16, inner ring 13, sliding sleeve 14, brake shaft tube 15, and push rod assembly 10 are symmetrically arranged in two sets on the left and right sides, respectively, and are arranged corresponding to the two rear wheels 7 in one group. Brake sleeves 12 for the rear brake cable 9 to pass through are fixed to the rear axle 6 by two brackets. The brake cable through-hole on the brake sleeve 12 is coaxial with the push rod 102. Figure 3 As shown, the two rear brake lines 9 cross each other and pass through the corresponding brake sleeves 12 before connecting to the corresponding push rods 102, thereby facilitating the movement of the rear brake lines 9 and reducing the resistance to movement.

[0055] like Figure 10 As shown, the push rod assembly 10 also includes an adjusting screw 105 threaded to the second end of the push rod 102. The rear brake cable 9 is fixedly connected to the adjusting screw 105. The tension of the rear brake cable 9 can be adjusted by adjusting the adjusting screw 105 to achieve a suitable braking effect.

[0056] The normally closed braking mechanism of this invention has two working states. One is the driving state, where gripping the brake lever 11 causes the front brake cable 8 and the rear brake cable 9 to move taut, thereby driving the push rod 102 and the inner ring of the toothed brake 13 to move synchronously and compress the spring 103, thus moving the inner ring of the toothed brake 13 away from the outer ring of the toothed brake 16 so that the rear wheel 7 can move. The other is the braking state, where releasing the brake lever 11 causes the push rod 102 to push the inner ring of the toothed brake 13 back to its original position under the reaction force of the spring 103, so that the protrusion 133 and the groove 163 engage to brake the rear wheel 7.

[0057] Therefore, the normally closed braking mechanism in this invention is compatible with the frame, axle, and tire structure of the transfer vehicle. Compared to existing simple handcarts, the transfer vehicle with its frame, axle, and tire structure can transport heavy goods. Furthermore, when the transfer vehicle is loading / unloading goods or placed on a slope or steep incline—that is, when the transport personnel are not operating the brake lever—the braking mechanism remains in a normally closed braking state, preventing accidents caused by vehicle movement. When movement is required, the transport personnel must lift and grip the brake lever, increasing safety and allowing for rapid brake release.

[0058] In other embodiments of the transfer vehicle with a normally closed braking mechanism: depending on the specific form and usage requirements of the transfer vehicle, the front wheels may be used as directional wheels and the rear wheels as steering wheels.

[0059] In other embodiments of the transfer vehicle with a normally closed braking mechanism: the toothed brake outer ring, toothed brake inner ring, sliding sleeve and push rod assembly can also be provided as a single set, in which case only one directional wheel is braked.

[0060] In other embodiments of the transfer vehicle with a normally closed braking mechanism: instead of fixing brake sleeves on the axle, pulleys are installed so that the brake cable passes around the pulleys to reduce friction.

[0061] In other embodiments of the transfer vehicle with a normally closed braking mechanism: the fixed housing is not cylindrical, but rather rectangular box-shaped, similar to that in patent document CN209382038U, and in this case there is no adjusting nut.

[0062] In other embodiments of the transfer vehicle with a normally closed braking mechanism: the fixed housing can also be fixed to the axle by a bracket.

[0063] In other embodiments of the transfer vehicle with a normally closed braking mechanism: the elastic element may also be a rubber sleeve.

[0064] In other embodiments of the transfer vehicle with a normally closed braking mechanism: the first end of the push rod and the inner ring of the toothed brake can be fixedly connected, and the two cannot rotate relative to each other.

[0065] In other embodiments of the transfer vehicle with a normally closed braking mechanism: the number of protrusions and grooves can be three, two, or one, respectively. When the number is relatively small, the circumferential dimensions of the protrusions and grooves can be set to be larger to ensure braking force, reduce protrusion deformation, and facilitate the mating of protrusions and grooves.

[0066] In other embodiments of the transfer vehicle with a normally closed braking mechanism: a protrusion may be provided on the end face of the outer ring of the toothed brake, and a groove may be provided on the end face of the inner ring of the toothed brake.

[0067] In other embodiments of the transfer vehicle with a normally closed braking mechanism, the inner ring of the toothed brake and the sliding sleeve can also be guided and slidably fitted by a T-groove and a T-shaped guide rail.

[0068] In other embodiments of the transfer vehicle with a normally closed braking mechanism: when the outer ring of the toothed brake does not need to be fitted with a bearing that mates with the wheel mounting section, the outer ring of the toothed brake may not include the outer ring cylindrical section; of course, the inner ring of the toothed brake may also not include the inner ring cylindrical section, but instead directly utilize the inner ring flange section and the sliding sleeve for guide sliding engagement.

[0069] In other embodiments of the transfer vehicle with a normally closed braking mechanism: the sliding sleeve and the brake shaft tube can also be fixedly connected by screws whose axis extends radially along the sliding sleeve, or the sliding sleeve and the brake shaft tube can be directly welded together.

[0070] In other embodiments of the transfer vehicle with a normally closed braking mechanism: the normally closed braking mechanism may not include a brake shaft tube, in which case the sliding sleeve includes an annular plate at the end, the annular plate being directly fixedly connected to the axle.

[0071] In other embodiments of the transfer vehicle with a normally closed braking mechanism: the outer ring of the toothed brake may also be a component additionally fixed to the hub of the directional wheel.

[0072] In other embodiments of the transfer vehicle with a normally closed braking mechanism: depending on the specific structural form of the transfer vehicle, the brake cable may not be divided into front and rear. When there are two brake cables, two brake handles can be used to control them separately. When there is only one brake handle, only one brake cable can be used.

[0073] In other embodiments of the transfer vehicle with a normally closed braking mechanism: the brake cable can be directly fixed to the second end of the push rod, instead of being connected via an adjusting screw.

[0074] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. The scope of patent protection of the present invention shall be determined by the claims. Similarly, any equivalent structural changes made based on the description and drawings of the present invention shall also be included within the scope of protection of the present invention.

Claims

1. A transfer vehicle with a normally closed braking mechanism, comprising a frame, the frame including a longitudinal beam (1) and two axles fixedly mounted on the longitudinal beam (1), wherein a set of wheels is rotatably mounted on each of the front and rear axles, wherein one set of wheels is a fixed wheel, characterized in that: The transfer vehicle also includes a normally closed braking mechanism, which includes a toothed outer ring (16), a toothed inner ring (13), and a sliding sleeve (14). The toothed outer ring (16) is fixed to the hub of the directional wheel or is integrally set with the hub to rotate synchronously with the directional wheel. The sliding sleeve (14) is directly or indirectly fixedly connected to the axle and is coaxially set with the axle. The toothed inner ring (13) is guided and slidably sleeved on the outside of the sliding sleeve (14) in the left and right direction. The opposite end faces of the toothed inner ring (13) and the toothed outer ring (16) are provided with protrusions and grooves for insertion and engagement so that the toothed inner ring (13) and the toothed outer ring (16) stop rotating in the circumferential direction. The normally closed braking mechanism also includes a push rod assembly (10) and a brake handle (11). The push rod assembly (10) includes a fixed shell fixed to the longitudinal beam (1) or the axle. (101), a push rod (102) passing through the fixed housing (101) and an elastic element installed in the fixed housing (101), the first end of the push rod (102) is connected to the inner ring of the toothed brake (13), and the brake handle (11) is connected to the second end of the push rod (102) through the brake line; the normally closed braking mechanism has a driving state in which the brake line is tensioned and moved when the brake handle (11) is gripped, thereby driving the push rod (102) and the inner ring of the toothed brake (13) to move synchronously and compress the elastic element, thereby moving the inner ring of the toothed brake (13) away from the outer ring of the toothed brake (16) so that the directional wheel can travel, and also has a braking state in which the push rod (102) pushes the inner ring of the toothed brake (13) to reset under the reaction force of the elastic element when the brake handle (11) is released, so that the protrusion and the groove are engaged to brake the directional wheel.

2. The transfer vehicle with a normally closed braking mechanism according to claim 1, characterized in that: The normally closed braking mechanism also includes a brake shaft tube (15), a sliding sleeve (14) is sleeved and fixed on the outside of the brake shaft tube (15), and an annular plate (151) is provided at the end of the brake shaft tube (15). The annular plate (151) is provided with a connection structure for fixed connection with the axle, and the inner hole of the annular plate (151) is for the wheel mounting section at the end of the axle to pass through.

3. The transfer vehicle with a normally closed braking mechanism according to claim 2, characterized in that: The sliding sleeve (14) and the brake shaft tube (15) are fixedly connected by a plurality of circumferentially arranged screws (17). The inner wall of the sliding sleeve (14) and the outer wall of the brake shaft tube (15) are respectively provided with semi-threaded holes for engaging together to connect the screws (17).

4. The transfer vehicle with a normally closed braking mechanism according to claim 2, characterized in that: The outer ring (16) of the toothed brake includes an outer ring cylindrical section (162) and an outer ring flange section (161). The outer ring flange section (161) is fixedly connected to the spokes (71) of the directional wheel by fasteners. A bearing (20) is installed between the outer ring cylindrical section (162) and the wheel mounting section. The outer ring cylindrical section (162) is inserted into the brake shaft tube (15). The inner ring (13) of the toothed brake includes an inner ring cylindrical section (132) and an inner ring flange section (131). The inner ring flange section (131) and the outer ring flange section (161) have a protrusion on one end face and a groove on the other end face.

5. The transfer vehicle with a normally closed braking mechanism according to any one of claims 1 to 4, characterized in that: The inner ring (13) of the gear brake and the sliding sleeve (14) are guided and slidably engaged by a flat key (21). The sliding sleeve (14) is provided with a mounting groove (141) for mounting the flat key (21). The inner surface of the inner ring (13) of the gear brake is provided with a sliding groove (135) that is guided and slidably engaged with the flat key (21). The sliding groove (135) is a through groove that runs from left to right.

6. The transfer vehicle with a normally closed braking mechanism according to any one of claims 1 to 4, characterized in that: The protrusions and grooves are each provided in at least three evenly distributed along the circumference.

7. The transfer vehicle with a normally closed braking mechanism according to any one of claims 1 to 4, characterized in that: The first end of the push rod (102) is hinged to the inner ring (13) of the gear brake, and the outer circumferential surface of the inner ring (13) of the gear brake is provided with an ear plate (134) for hinged connection with the first end of the push rod (102).

8. The transfer vehicle with a normally closed braking mechanism according to any one of claims 1 to 4, characterized in that: A collar (1021) is provided on the outer periphery of the push rod (102). The fixed shell (101) is cylindrical. One end of the fixed shell (101) is provided with an inwardly extending inner protruding ring for blocking and engaging with one side end face of the collar (1021). The other end of the fixed shell (101) is threadedly connected to an adjusting nut (104). The two ends of the elastic element press against the adjusting nut (104) and the other side end face of the collar (1021), respectively.

9. The transfer vehicle with a normally closed braking mechanism according to any one of claims 1 to 4, characterized in that: A brake sleeve (12) is fixed on the axle for the brake cable to pass through, and the brake cable hole on the brake sleeve (12) is coaxial with the push rod (102).

10. The transfer vehicle with a normally closed braking mechanism according to claim 9, characterized in that: Two sets of toothed brake outer ring (16), toothed brake inner ring (13), sliding sleeve (14) and push rod assembly (10) are provided symmetrically on the left and right, and are respectively arranged corresponding to two directional wheels in a group. Two brake sleeves (12) and two brake lines are also provided. Two fixing clips (22) for limiting the brake lines are provided on the two longitudinal beams (1). The two brake lines pass through the corresponding brake sleeves in a cross shape and are connected to the corresponding push rods.

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