Blade braking device of mowing vehicle and mowing vehicle

Abstract

The utility model discloses a blade braking device of a mowing vehicle and the mowing vehicle, and relates to the technical field of mowing vehicles, the blade braking device of the mowing vehicle comprises a braking block, the braking block is provided with at least two friction surfaces, and the at least two friction surfaces are used for being in friction with the inner wall surface of a belt pulley to achieve braking of the belt pulley and a blade; the brake block is configured to move between a first position and a second position relative to a belt pulley of the mowing vehicle, so that when the brake block is located at the first position, at least two friction surfaces are in friction with the inner wall surface of the belt pulley to brake the belt pulley and the blade, and when the brake block is located at the second position, the brake block is separated from the belt pulley. According to the blade braking device of the mowing vehicle, the problem that the braking time is unstable due to friction between metal parts and a belt is solved.

Description

Technical Field

[0001] This application relates to the field of lawnmower technology, and particularly to a blade braking device for a lawnmower and a lawnmower. Background Technology

[0002] Currently, the torque output of the lawnmower is transmitted to the pulley (or belt pulley) on the blade head via a belt drive. The pulley and blades are fastened to the blade mounting base with bolts. The pulley transmits torque to the blades through the blade mounting base, causing the blades to rotate and perform the mowing function. The blades need to rotate to cut the grass and stop rotating afterward. Safety regulations require that the time from rotation to stopping should be less than or equal to 5 seconds. Currently, the main solution is to use metal parts to brake the belt, which involves friction between metal parts and the belt to brake it. However, this method has an unstable braking time and fails to meet the safety requirements for blade braking. Utility Model Content

[0003] The purpose of this application is to provide a blade braking device for a lawnmower and a lawnmower that solves the problem of unstable braking time caused by friction between metal parts and belts.

[0004] To achieve the above objectives, this application provides a blade braking device for a lawnmower, including a brake block with at least two friction surfaces. The brake block is configured to move relative to the pulley of the lawnmower between a first position and a second position, such that when the brake block is in the first position, the at least two friction surfaces rub against the inner wall surface of the pulley to brake the pulley and the blade, and when it is in the second position, it disengages from the pulley.

[0005] In some embodiments, the brake block is provided with a first friction surface and a second friction surface, which are located on opposite sides of the brake block. The first friction surface and the second friction surface are respectively used to rub against two conical surfaces of the inner wall of the pulley.

[0006] In some embodiments, the brake block is further provided with a connecting surface for connecting with a brake transmission mechanism, both the first friction surface and the second friction surface are concave arc surfaces, and the distance between the first friction surface and the second friction surface gradually decreases in the direction away from the connecting surface.

[0007] In some embodiments, the brake block is further provided with a third friction surface located on the opposite side of the connecting surface and between the first friction surface and the second friction surface, the third friction surface being used to rub against the belt wound on the pulley.

[0008] In some embodiments, the blade braking device further includes a braking transmission mechanism, which includes:

[0009] A brake pull plate, connected to a brake block, is rotatably mounted on the cutter head to drive the brake block to rotate from the first position to the second position.

[0010] The brake cable, connected to the brake plate, is used to drive the brake plate to rotate;

[0011] A brake handle assembly, connected to a brake cable, is mounted on the frame to trigger the brake cable to pull the brake lever.

[0012] The reset elastic element has one end connected to the brake pull plate and the other end connected to the cutter disc to provide elastic force so that the brake block has a tendency to rotate from the second position to the first position.

[0013] In some embodiments, the braking transmission mechanism further includes:

[0014] Bushings are used to mount on the cutter head;

[0015] The brake pull plate is rotatably connected to the bushing via the rotating connecting assembly, causing the brake pull plate to rotate along the axis of the rotating connecting assembly.

[0016] In some embodiments, the brake pull plate has a protrusion in the middle that mates with the bushing, the rotatable connecting assembly passes through the protrusion and is fixed to the bushing, the first end of the brake pull plate has a connecting plate, and the brake block is fixed to the connecting plate by a fixing plate.

[0017] In some embodiments, the second end of the brake pull plate is provided with a pull tab, and the brake transmission mechanism further includes:

[0018] The tensioner guide rail is equipped with a guide groove;

[0019] The tension wheel fixing bracket is slidably connected in the guide groove and connected to the pull plate. It is used to assemble the tension wheel and also to slide along the guide groove when the brake pull plate rotates.

[0020] In some embodiments, the blade braking device further includes:

[0021] An angle detection component is used to detect the rotation angle of the brake block;

[0022] The prompting component, which communicates with the angle detection component, is used to issue a prompt when the rotation angle of the brake block exceeds a set value.

[0023] This application also provides a lawnmower, including a belt, a pulley, blades, and a blade mounting base. The belt is connected to the pulley for transmission. The pulley and blades are disposed on the blade mounting base. The application also includes a blade braking device of the lawnmower according to any of the above claims. The brake block of the blade braking device has at least two friction surfaces. The brake block is configured to move relative to the pulley between a first position and a second position, such that when the brake block is in the first position, at least two friction surfaces rub against the inner wall surface of the pulley to brake the pulley and blades, and when it is in the second position, it disengages from the pulley.

[0024] Compared to the above-mentioned background technology, the blade braking device of the lawnmower provided in the embodiments of this application includes a brake block. The brake block is provided with at least two friction surfaces, which are used to rub against the inner wall surface of the belt pulley to achieve braking of the belt pulley and the blade. The brake block is configured to move relative to the belt pulley of the lawnmower between a first position and a second position, such that when the brake block is in the first position, at least two friction surfaces rub against the inner wall surface of the belt pulley to achieve braking of the belt pulley and the blade, and when it is in the second position, it disengages from the belt pulley.

[0025] In this way, when it is necessary to brake the blade, the brake block is moved from the second position to the first position, so that at least two friction surfaces of the brake block rub against the inner wall surface of the pulley, thereby achieving braking of the pulley and the blade.

[0026] The beneficial effects of the blade braking device of the lawnmower designed in this way mainly include: Compared with the traditional method of braking the belt by friction between metal parts and the belt, the blade braking device provided in this application embodiment uses a brake block with at least two friction surfaces. On the one hand, compared with the friction belt (the belt is generally made of non-metallic composite material, such as rubber or polymer material), the friction coefficient is low. The brake block directly rubs against the belt pulley (the belt pulley is generally made of metal material), which increases the friction coefficient. On the other hand, the brake block has at least two friction surfaces that rub against the inner wall of the belt pulley, which increases the friction contact area. This makes the braking force more stable and the braking time of the belt pulley shorter, making it easier to meet the safety specifications for blade braking. Thus, it solves the problem of unstable braking time or braking force caused by friction between metal parts and the belt. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this application or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the blade braking device of the lawnmower in the embodiments of this application. Figure 1 ;

[0029] Figure 2 This is a schematic diagram of the blade braking device of the lawnmower in the embodiments of this application. Figure 2 ;

[0030] Figure 3 for Figure 1 Enlarged diagram of part A in the middle;

[0031] Figure 4for Figure 3 A schematic diagram of the structure of the braking block.

[0032] in:

[0033] 10-Brake block, 11-First friction surface, 12-Second friction surface, 13-Third friction surface, 14-Connecting surface;

[0034] 20-Brake transmission mechanism, 21-Brake pull plate, 211-Connecting plate, 212-Pull plate, 22-Brake cable, 23-Reset elastic element, 24-Bushing, 25-Rotating connection assembly, 26-Tension wheel guide rail, 27-Tension wheel fixing bracket;

[0035] 30 - Belt;

[0036] 40-Pulley;

[0037] 50-blade mount;

[0038] 60-Cutterhead. Detailed Implementation

[0039] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0040] To enable those skilled in the art to better understand the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0041] It should be noted that the directional terms such as "upper end," "lower end," "left side," and "right side" mentioned below are defined based on the accompanying drawings in the instruction manual.

[0042] Please refer to Figure 1 , Figure 2 , Figure 3 and Figure 4 , Figure 1 This is a schematic diagram of the blade braking device of the lawnmower in the embodiments of this application. Figure 1 ; Figure 2 This is a schematic diagram of the blade braking device of the lawnmower in the embodiments of this application. Figure 2 ; Figure 3 for Figure 1 Enlarged diagram of part A in the middle; Figure 4 for Figure 3 A schematic diagram of the structure of the braking block.

[0043] The blade braking device of the lawnmower provided in this application embodiment includes a brake block 10. The brake block 10 is provided with at least two friction surfaces, which are used to rub against the inner wall surface of the belt pulley 40 to achieve braking of the belt pulley 40 and the blade.

[0044] In this embodiment, the brake block 10 is configured to move between a first position and a second position relative to the belt pulley 40 of the lawnmower, such that when the brake block 10 is in the first position, at least two friction surfaces rub against the inner wall surface of the belt pulley 40 to brake the belt pulley 40 and the blades, and when it is in the second position, it disengages from the belt pulley 40. Figure 1 The brake block 10 shown has at least two friction surfaces that rub against the inner wall of the pulley 40 in the first position and disengages from the pulley 40 in the second position.

[0045] In this way, when it is necessary to brake the blade, the brake block 10 is moved from the second position to the first position, so that at least two friction surfaces of the brake block 10 rub against the inner wall surface of the pulley 40, thereby achieving braking of the pulley 40 and the blade.

[0046] Compared to the traditional method of braking the belt 30 by friction between metal parts and the belt 30, the blade braking device provided in this application embodiment uses a brake block 10 with at least two friction surfaces. On the one hand, compared to the friction belt 30 (which is generally made of non-metallic composite materials, such as rubber or polymer materials), the friction coefficient is low. By directly rubbing the brake block 10 against the belt pulley 40 (which is generally made of metal materials), the friction coefficient is increased. On the other hand, the brake block 10 has at least two friction surfaces that rub against the inner wall of the belt pulley 40, increasing the friction contact area. This makes the braking force more stable and the braking time of the belt pulley 40 shorter, making it easier to meet the safety specifications for blade braking. This solves the problem of unstable braking time or braking force caused by friction between metal parts and the belt 30.

[0047] In some embodiments, the brake block 10 is provided with a first friction surface 11 and a second friction surface 12. The first friction surface 11 and the second friction surface 12 are provided on opposite sides of the brake block 10. For example, the first friction surface 11 and the second friction surface 12 are provided on the upper and lower sides of the brake block 10. The first friction surface 11 and the second friction surface 12 are respectively used to rub against the two conical surfaces of the inner wall of the pulley 40.

[0048] In this embodiment, the brake block 10 is further provided with a connecting surface 14 for connecting with the brake transmission mechanism 20. Both the first friction surface 11 and the second friction surface 12 are concave arc surfaces, and the distance between the first friction surface 11 and the second friction surface 12 gradually decreases in the direction away from the connecting surface 14. This arrangement allows the friction surface on the brake block 10 to contact and fit as closely as possible with the conical part of the inner wall of the pulley 40. This can further increase the contact area between the brake block 10 and the pulley 40, increase the braking force, and reduce the braking time for the blade.

[0049] Of course, depending on actual needs, the two concave arc surfaces can be symmetrically arranged on the upper and lower sides of the brake block 10. This can ensure that the braking force is evenly distributed when the brake block 10 rubs against the pulley 40, thereby making the braking force generated by the brake block 10 more stable.

[0050] Based on the above, the brake block 10 is also provided with a third friction surface 13 located on the opposite side of the connecting surface 14 and between the first friction surface 11 and the second friction surface 12. The third friction surface 13 is used to rub against the belt 30 wound on the pulley 40.

[0051] In this way, while ensuring that the first friction surface 11 and the second friction surface 12 rub against the two conical surfaces of the pulley 40 respectively, the third friction surface 13 rubs against the belt 30 wound on the pulley 40. This can further increase the braking contact area generated by the brake block 10, increase the braking force, and reduce the braking time of the blade.

[0052] In some embodiments, the blade brake device further includes a brake transmission mechanism 20, which is connected to the brake block 10. The brake transmission mechanism 20 is used to drive the brake block 10 to move relative to the pulley 40 between a first position and a second position, so that the brake block 10 rubs against the pulley 40 in the first position and disengages from the pulley 40 in the second position.

[0053] In this way, when it is necessary to brake the blade, the brake transmission mechanism 20 drives the brake block 10 to move from the second position to the first position, so that at least two friction surfaces of the brake block 10 rub against the inner wall surface of the pulley 40 of the lawnmower, thereby achieving braking of the blade.

[0054] Specifically, the braking transmission mechanism 20 includes a brake pull plate 21, a brake cable 22, a brake handle assembly, and a reset elastic element 23. The brake pull plate 21 is connected to the brake block 10 and is rotatably mounted on the cutter disc 60 to rotate the brake block 10 from a first position to a second position. The brake cable 22 is connected to the brake pull plate 21 and is used to rotate the brake pull plate 21. The brake handle assembly is connected to the brake cable 22 and is mounted on the frame to trigger the brake cable 22 to pull the brake pull plate 21. One end of the reset elastic element 23 (reset spring) is connected to the brake pull plate 21, and the other end is connected to the cutter disc 60. The reset elastic element 23 provides elastic force to give the brake block 10 a tendency to rotate from the second position to the first position.

[0055] It should be noted that the brake handle assembly includes a brake handle seat and a brake operating handle. The brake handle seat and the brake operating handle are mounted on the vehicle frame. One end of the brake cable 22 is connected to the brake handle seat, and one end of the spring on the brake cable 22 is connected to the brake pull plate 21. The brake block 10 is disengaged and braked by the brake operating handle.

[0056] When the brake cable 22 pulls the brake plate 21 to rotate outward, the brake block 10 disengages from the pulley 40. After the brake cable 22 is released, the brake block 10 brakes the pulley 40 under the action of the reset elastic member 23. One end of the reset elastic member 23 can be hung on the cutter head 60 and the other end can be hung on the brake plate 21.

[0057] In this way, when braking is required, the brake cable 22 can be released directly, so that the brake block 10 brakes the pulley 40 under the action of the reset elastic member 23.

[0058] In some embodiments, the brake transmission mechanism 20 further includes a bushing 24 and a rotatable connection assembly 25.

[0059] The bushing 24 is used to be mounted on the cutter head 60. The middle part of the brake pull plate 21 is rotatably connected to the bushing 24 through the rotating connection assembly 25, so that the brake pull plate 21 rotates along the axis of the rotating connection assembly 25.

[0060] Of course, the rotating connection assembly 25 can be a bolt assembly, and the brake pull plate 21 is fixed to the bushing 24 by the bolt assembly. The brake pull plate 21 and the brake block 10 can rotate around the axis of the bolt assembly.

[0061] In some embodiments, the brake pull plate 21 has a downward protrusion in the middle, which cooperates with the bushing 24. The rotating connecting assembly 25 passes through the protrusion and is fixed to the bushing 24. The first end of the brake pull plate 21 has a connecting plate 211. The brake block 10 is assembled on the fixing plate by fasteners. The fixing plate and the brake block 10 are fixed on the connecting plate 211 of the brake pull plate 21 by bolts.

[0062] In some embodiments, the second end of the brake pull plate 21 is provided with a pull tab 212, and the brake transmission mechanism 20 further includes a tension wheel guide rail 26 and a tension wheel fixing bracket 27. The tension wheel guide rail 26 is provided with a guide groove, and the tension wheel fixing bracket 27 is slidably connected within the guide groove. The tension wheel fixing bracket 27 is connected to the pull tab 212 and is used to assemble the tension wheel (not shown in the figure). The tension wheel fixing bracket 27 is also used to slide along the guide groove when the brake pull plate 21 rotates.

[0063] With this configuration, when the brake cable 22 pulls the brake plate 21 to rotate, the tension wheel fixing bracket 27 can slide along the guide groove. Under the restriction of the pull plate 212, the brake plate 21 can rotate along the set path. This can guide the rotation of the brake plate 21 and ensure the stability of the rotation of the brake plate 21.

[0064] Furthermore, considering that the tensioning pulley needs to be loosened before braking, the braking on the brake plate 21 and the tensioning pulley tensioning the belt 30 are set to be in the opposite relationship. That is, when the brake block 10 on the brake plate 21 brakes, the tensioning pulley and the belt 30 are disengaged, so that the disengagement of the tensioning pulley and the belt 30 is completed before braking.

[0065] It should be noted that if the tensioner is not loosened, the driving pulley on the engine will continue to rotate the belt 30 and the driven pulley (pulley 40). Only by loosening the tensioner will the rotational force of the pulley 40 be reduced, and the pulley 40 will be more easily braked by the brake block 10, which is beneficial to meeting regulatory requirements.

[0066] In some embodiments, the blade braking device further includes an angle detection component and a prompting component.

[0067] The angle detection component is used to detect the rotation angle of the brake block 10; the prompting component is connected in communication with the angle detection component and is used to issue a prompt when the rotation angle of the brake block 10 exceeds a set value.

[0068] The prompting component can be an audible and visual prompting component, such as an alarm. When the rotation angle of the brake block 10 exceeds the set value (which can be the angle value of the brake block 10 rotating from the first position to the second position), it indicates that the brake block 10 and / or the pulley 40 are worn too much and need to be replaced. At this time, the audible and visual prompting component will prompt the staff to carry out timely maintenance and replacement.

[0069] The lawnmower provided in this application includes a belt 30, a belt pulley 40, blades, and a blade mounting seat 50. The belt 30 is connected to the belt pulley 40 in a transmission manner. The belt pulley 40 and the blades are fastened to the blade mounting seat 50 by bolts. The lawnmower also includes a blade braking device as described in the above specific embodiment. The brake block 10 of the blade braking device is provided with at least two friction surfaces. The brake block 10 is configured to move relative to the belt pulley 40 between a first position and a second position, such that when the brake block 10 is in the first position, at least two friction surfaces rub against the inner wall surface of the belt pulley 40 to brake the belt pulley 40 and the blades, and when it is in the second position, it disengages from the belt pulley 40.

[0070] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0071] The blade braking device and the lawnmower provided in this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are only for the purpose of helping to understand the solution and core ideas of this application. It should be noted that those skilled in the art can make several improvements and modifications to this application without departing from the principles of this application, and these improvements and modifications also fall within the protection scope of this application.

Claims

1. A blade braking device for a lawnmower, characterized in that, Includes a brake block (10) having at least two friction surfaces, the brake block (10) being configured to move relative to the pulley (40) of the lawnmower between a first position and a second position, such that when the brake block (10) is in the first position, at least two of the friction surfaces rub against the inner wall surface of the pulley (40) to brake the pulley (40) and the blades, and when it is in the second position, it disengages from the pulley (40).

2. The blade braking device of the lawnmower as described in claim 1, characterized in that, The brake block (10) is provided with a first friction surface (11) and a second friction surface (12). The first friction surface (11) and the second friction surface (12) are provided on opposite sides of the brake block (10). The first friction surface (11) and the second friction surface (12) are respectively used to rub against the two conical surfaces of the inner wall of the pulley (40).

3. The blade braking device of the lawnmower as described in claim 2, characterized in that, The brake block (10) is also provided with a connecting surface (14) for connecting with the brake transmission mechanism (20). Both the first friction surface (11) and the second friction surface (12) are concave arc surfaces, and the distance between the first friction surface (11) and the second friction surface (12) gradually decreases in the direction away from the connecting surface (14).

4. The blade braking device of the lawnmower as described in claim 3, characterized in that, The brake block (10) is also provided with a third friction surface (13) located on the opposite side of the connecting surface (14) and between the first friction surface (11) and the second friction surface (12), the third friction surface (13) being used to rub against the belt (30) wound on the pulley (40).

5. The blade braking device of the lawnmower as described in claim 1, characterized in that, The blade braking device further includes a braking transmission mechanism (20), which includes: Brake pull plate (21), connected to the brake block (10), is rotatably mounted on the cutter head (60) to drive the brake block (10) to rotate from the first position to the second position; Brake cable (22) is connected to brake plate (21) and is used to drive brake plate (21) to rotate; A brake handle assembly, connected to the brake cable (22), is mounted on the frame to trigger the brake cable (22) to pull the brake plate (21). The reset elastic element (23), one end of which is connected to the brake pull plate (21) and the other end is used to connect to the cutter disc (60) to provide elastic force so that the brake block (10) has a tendency to rotate from the second position to the first position.

6. The blade braking device of the lawnmower as described in claim 5, characterized in that, The braking transmission mechanism (20) further includes: Bushing (24) is used to be mounted on the cutter head (60); Rotary connecting assembly (25), the middle part of the brake pull plate (21) is rotatably connected to the bushing (24) through the rotary connecting assembly (25), so that the brake pull plate (21) rotates along the axis of the rotary connecting assembly (25).

7. The blade braking device of the lawnmower as described in claim 6, characterized in that, The brake pull plate (21) has a protrusion in the middle that cooperates with the bushing (24). The rotating connection assembly (25) passes through the protrusion and is fixed to the bushing (24). The first end of the brake pull plate (21) is provided with a connecting plate (211). The brake block (10) is fixed to the connecting plate (211) by a fixing plate.

8. The blade braking device of the lawnmower as described in claim 7, characterized in that, The second end of the brake pull plate (21) is provided with a pull tab (212), and the brake transmission mechanism (20) further includes: The tension wheel guide rail (26) is provided with a guide groove; The tension wheel fixing bracket (27) is slidably connected in the guide groove and connected to the pull plate (212) for assembling the tension wheel and for sliding along the guide groove when the brake pull plate (21) rotates.

9. The blade braking device of the lawnmower as described in any one of claims 1-8, characterized in that, The blade braking device further includes: An angle detection component is used to detect the rotation angle of the brake block (10); The prompting component is communicatively connected to the angle detection component and is used to issue a prompt when the rotation angle of the brake block (10) exceeds a set value.

10. A lawnmower, comprising a belt (30), a belt reel (40), blades, and a blade mounting base (50), wherein the belt (30) is tractively connected to the belt reel (40), and the belt reel (40) and the blades are disposed on the blade mounting base (50), characterized in that, It also includes a blade braking device for a lawnmower as described in any one of claims 1-9, wherein the brake block (10) of the blade braking device is provided with at least two friction surfaces, the brake block (10) is configured to move relative to the pulley (40) between a first position and a second position, such that when the brake block (10) is in the first position, at least two of the friction surfaces rub against the inner wall surface of the pulley (40) to brake the pulley (40) and the blade, and when it is in the second position, it disengages from the pulley (40).

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