Anti-neutral-gear safety gearbox and bicycle with anti-neutral-gear safety gearbox

Abstract

The utility model relates to the technical field of gearboxes and bicycles, in particular to an anti-neutral-gear safety gearbox which comprises a main shaft, an auxiliary shaft, a main shaft gear installed on the main shaft and an auxiliary shaft gear installed on the auxiliary shaft, and the main shaft gear is meshed with the auxiliary shaft gear. The auxiliary shaft gear is provided with at least one pawl piece and a reset piece used for resetting the pawl piece. According to the anti-neutral-gear safe gearbox and the bicycle, it can be guaranteed that the gearbox is not in the neutral gear state all the time, so that the riding danger of the bicycle in the neutral gear state is avoided, riding safety is guaranteed, and the safety and reliability of products are guaranteed. Meanwhile, the pawl piece and the reset piece are directly installed on the auxiliary shaft in the auxiliary shaft gear, and compared with an existing gear shifting control system which adopts a structure that a ratchet wheel is installed on a main shaft and meshed with a main shaft gear, the gear shifting control system effectively utilizes the installation space between the auxiliary shaft gear and the auxiliary shaft, so that the structure is more compact, the overall size of a gearbox is reduced, and cost is reduced. And the practicability is very high.

Description

TECHNICAL FIELD

[0001] The utility model relates to gearbox and bicycle technical field, especially is a kind of anti-empty gear safety type gearbox and its bicycle. BACKGROUND

[0002] In gearbox, in order to realize the transmission change between different gear pairs of gearbox, gear shifting control system is needed to shift gears. Each pair of gears in gearbox is shifted by gear shifting control system to realize gear engagement or gear shifting of gearbox.

[0003] In actual use, gear shifting pull wire of gearbox can be broken, or drum rod mechanism or slider mechanism in gear shifting control system can be deformed, jammed and the like, so that gearbox cannot be engaged, resulting in that gearbox is always in idle gear state, which can cause use risk. For example, when user rides bicycle on a steep section, suddenly gearbox of bicycle is in idle gear and cannot be engaged, which can cause bicycle to be unable to be quickly controlled, resulting in riding accident.

[0004] Based on the above deficiencies of existing gearbox, a solution is needed to avoid the riding risk. SUMMARY

[0005] The utility model provides a kind of anti-empty gear safety type gearbox and its bicycle in view of the deficiency of prior art.

[0006] To solve the above technical problems, the utility model adopts the following technical scheme:

[0007] The utility model provides a kind of anti-empty gear safety type gearbox, including main shaft, auxiliary shaft, main shaft gear installed on main shaft and auxiliary shaft gear installed on auxiliary shaft, the main shaft gear is engaged with auxiliary shaft gear;

[0008] At least one pawl piece and reset piece for resetting pawl piece are installed on the auxiliary shaft gear, and the pawl piece is located in the auxiliary shaft gear;When auxiliary shaft drives pawl piece to rotate, pawl piece slips in auxiliary shaft gear;When main shaft drives main shaft gear and auxiliary shaft gear to rotate, pawl piece is engaged with auxiliary shaft gear, so that pawl piece drives auxiliary shaft to rotate.

[0009] Preferably, the main shaft gear and the auxiliary shaft gear are both one gear of the gearbox.

[0010] Preferably, the auxiliary shaft is provided with a pawl slot, the pawl piece is provided with a mounting portion matched with the pawl slot, and the mounting portion is mounted in the pawl slot.

[0011] Preferably, the pawl piece is further provided with a pawl portion, one side of the pawl portion is provided with an arc-shaped sliding surface, and the other side of the pawl portion is provided with an engagement surface.

[0012] Preferably, the pawl piece is provided with a first fixing groove, the secondary shaft is provided with a second fixing groove, the reset piece is a ring spring, and the reset piece embeds the first fixing groove and the second fixing groove to install the pawl piece on the secondary shaft; the reset piece always makes the pawl part of the pawl piece protrude out of the pawl groove.

[0013] Preferably, three pawl pieces are evenly distributed on the secondary shaft.

[0014] Preferably, the utility model also comprises a plurality of main shaft gear shift gears arranged on the main shaft, a secondary shaft gear shift gear arranged on the secondary shaft and meshing with the main shaft gear shift gear, and a gear shift control system.

[0015] The utility model also provides a bicycle, which comprises the safety type derailleur.

[0016] The utility model has the advantages of:

[0017] The safety type derailleur and the bicycle can always ensure that the derailleur is not in the neutral state, thereby avoiding the riding risk of the bicycle in the neutral state, ensuring the riding safety, and ensuring the safety and reliability of the product. Meanwhile, the pawl piece and the reset piece are directly installed on the secondary shaft in the secondary shaft gear, compared with the structure that the existing gear shift control system adopts the installation of the ratchet wheel on the main shaft and the meshing of the main shaft gear, the safety type derailleur effectively utilizes the installation space between the secondary shaft gear and the secondary shaft, makes the structure more compact, is favorable for reducing the overall volume of the derailleur, and has strong practicability. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a perspective structural schematic view of the safety type derailleur.

[0019] Figure 2 It is an exploded structural schematic view of the safety type derailleur.

[0020] Figure 3 It is a structural schematic view of the secondary shaft, the pawl piece and the reset piece. Figure 2 It is an enlarged structural schematic view of the section D-D.

[0021] Figure 4 It is an exploded structural schematic view of the secondary shaft, the pawl piece and the reset piece.

[0022] Figure 5 It is a structural schematic view of the secondary shaft, the pawl piece and the reset piece.

[0023] Figure 6 It is an enlarged structural schematic view of the section D-D. Figure 5 It is an enlarged structural schematic view of the section D-D.

[0024] Figure 7 As Figure 5 The cross-section enlarged structural schematic view at C-C in the middle.

[0025] Figure 8 The three-dimensional schematic view of the pawl piece and the reset piece. Specific embodiments

[0026] In order to facilitate the understanding of those skilled in the art, the utility model will be further described below in combination with examples and drawings, and the content mentioned in the implementation manner is not a limitation on the utility model. The utility model is described in detail below in combination with drawings.

[0027] Reference Figures 1 to 8 As shown in the figure, the utility model provides a kind of safety type gearbox of preventing empty gear, including main shaft 1, auxiliary shaft 2, main shaft gear 3 installed in main shaft 1 and auxiliary shaft gear 4 installed in auxiliary shaft 2, the main shaft gear 3 is engaged with auxiliary shaft gear 4;At least one pawl piece 5 and reset piece 6 for making pawl piece 5 reset are installed in auxiliary shaft gear 4, and the pawl piece 5 is located in auxiliary shaft gear 4;When using, when auxiliary shaft 2 drives pawl piece 5 to rotate, the pawl piece 5 skids in auxiliary shaft gear 4;When main shaft 1 drives main shaft gear 3 and auxiliary shaft gear 4 to rotate, the pawl piece 5 is engaged with auxiliary shaft gear 4, to make pawl piece 5 drive auxiliary shaft 2 to rotate.

[0028] When actually applied, main shaft gear 3 and auxiliary shaft gear 4 can be all set as one gear of gearbox.When the gearbox is normally used, when auxiliary shaft 2 drives pawl piece 5 to rotate, the pawl piece 5 skids in auxiliary shaft gear 4, the pawl piece 5 cannot be engaged with auxiliary shaft gear 4 to drive, and it does not affect the transmission of other high gear gears;When the gear change pull line of gearbox breaks, or the drum rod mechanism or slider mechanism in gear change control system appears deformation, jamming and other faults, so that the gearbox cannot be engaged, main shaft 1 drives main shaft gear 3 to rotate, and main shaft gear 3 drives auxiliary shaft gear 4 to rotate, and auxiliary shaft gear 4 is engaged with pawl piece 5 and drives auxiliary shaft 2 to rotate, to avoid the gearbox in empty gear state.

[0029] The safety type gearbox of preventing empty gear can always ensure that the gearbox will not be in empty gear state, to avoid the riding danger of bicycle in empty gear state, to ensure the riding safety, and ensure the safety and reliability of product.At the same time, pawl piece 5 and reset piece 6 are directly installed on auxiliary shaft 2 in auxiliary shaft gear 4, compared with the structure that the existing gear change control system is installed on main shaft 1 with main shaft gear 3 engagement, the safety type gearbox of preventing empty gear effectively utilizes the installation space between auxiliary shaft gear 4 and auxiliary shaft 2, so that its structure is more compact, is favorable to reduce the overall volume of gearbox, and reduce the weight of gearbox and bicycle, and it has strong practicability.

[0030] In the embodiment, the secondary shaft 2 is provided with a pawl slot 21, the pawl piece 5 is provided with a mounting portion 51 matched with the pawl slot 21, and the mounting portion 51 is mounted in the pawl slot 21, facilitating the mounting of the pawl piece 5.

[0031] In the embodiment, the pawl piece 5 is further provided with a pawl portion 52, one side of the pawl portion 52 is provided with an arc-shaped sliding surface 521, and the other side of the pawl portion 52 is provided with an engaging surface 522. Specifically, the pawl portion 52 and the mounting portion 51 are structured to make the pawl piece 5 as a whole in a wedge shape; the arc-shaped sliding surface 521 facilitates the pawl piece 5 to slide out of the tooth slot of the secondary shaft gear 4, so as to slip and not engage; and the engaging surface 522 makes the pawl portion 52 engage with the tooth slot of the secondary shaft gear 4, so as to drive the secondary shaft gear 4 and the secondary shaft 2 to rotate, and make the gearbox not in the neutral state.

[0032] In actual use, the primary shaft gear 3 and the secondary shaft gear 4 are both set as one gear position of the gearbox, and when the gearbox can normally shift and change gears in other gear positions such as the second gear to the fifth gear, the rotation speed of the secondary shaft 2 driving the pawl piece 5 is higher than that of the secondary shaft gear 4, so that the arc-shaped sliding surface 521 of the pawl piece 5 contacts the tooth slot of the secondary shaft gear 4, thereby slipping and idling without engaging, and not affecting the use of other gear positions.

[0033] In the embodiment, the pawl piece 5 is provided with a first fixing slot 53, the secondary shaft 2 is provided with a second fixing slot 22, the reset piece 6 is a ring-shaped spring, and the reset piece 6 is embedded in the first fixing slot 53 and the second fixing slot 22 to mount the pawl piece 5 on the secondary shaft 2; the reset piece 6 clamps the pawl piece 5, and the reset piece 6 always makes the pawl portion 52 of the pawl piece 5 protrude out of the pawl slot 21. When the pawl piece 5 contacts and slips with the secondary shaft gear 4, after the pawl piece 5 is pressed down and slides by the secondary shaft gear 4, the elasticity of the reset piece 6 again makes the pawl portion 52 protrude out of the pawl slot 21.

[0034] The cooperation structure of the secondary shaft 2, the secondary shaft gear 4, the reset piece 6 and the pawl piece 5 of the gearbox is convenient to mount and replace, the structure design is ingenious, at least one set of gear shifting ratchet mechanism for separating and engaging the gear of the gear position is reduced, the occupation of the internal space of the gearbox is reduced, the gearbox can be made smaller, lighter and safer.

[0035] In the embodiment, preferably, three pawl pieces 5 are provided, and the three pawl pieces 5 are uniformly distributed on the secondary shaft 2.

[0036] In the embodiment, a plurality of primary shaft gear shifting gears 10 provided on the primary shaft 1, a secondary shaft gear shifting gear 20 provided on the secondary shaft 2 and matched with the primary shaft gear shifting gear, and a gear shifting control system 30 are further included, so that the gearbox is provided with multiple gear positions. The gear shifting control system 30 can be realized by using existing mechanisms, and thus is not described in detail.

[0037] The utility model also provides a bicycle, the bicycle includes the safety type gearbox of preventing empty gear of above-mentioned, the safety type gearbox of preventing empty gear of the bicycle can always guarantee that gearbox will not be in empty gear state, thereby avoids the riding risk of bicycle in empty gear state, thereby guarantees the riding safety, ensures the safety and reliability of product. Meanwhile, the pawl piece 5 and reset piece 6 are installed on the auxiliary shaft 2 in the auxiliary shaft gear 4 directly, compared with the structure of the existing gear shifting control system that the ratchet wheel is installed on the main shaft 1 and is engaged with the main shaft gear 3, the safety type gearbox of preventing empty gear of the utility model effectively utilizes the installation space between the auxiliary shaft gear 4 and the auxiliary shaft 2, makes its structure more compact, is favorable to reducing the overall volume of gearbox, reduces the weight of bicycle, and it has very strong practicality.

[0038] The above is only the preferred embodiment of the utility model, and does not limit the utility model in any form, although the utility model discloses the above preferred embodiment, however, it is not used to limit the utility model, any skilled person in the art, without departing from the technical scheme range of the utility model, when utilizing the technical content disclosed above makes a little change or modification equivalent embodiment of equivalent change, but as long as not departing from the technical scheme content of the utility model, according to the utility model technology refers to any simple modification, equivalent change and modification of the above embodiment, all belong to the range of the technical scheme of the utility model.

Claims

1. A non-negatively engaged safety transmission, characterized by: The transmission comprises a main shaft (1), a secondary shaft (2), a main shaft gear (3) mounted on the main shaft (1) and a secondary shaft gear (4) mounted on the secondary shaft (2), the main shaft gear (3) and the secondary shaft gear (4) are engaged; The secondary shaft gear (4) is provided with at least one pawl (5) and a reset member (6) for resetting the pawl (5), the pawl (5) is located in the secondary shaft gear (4); when the secondary shaft (2) drives the pawl (5) to rotate, the pawl (5) slips in the secondary shaft gear (4); when the main shaft (1) drives the main shaft gear (3) and the secondary shaft gear (4) to rotate, the pawl (5) is engaged with the secondary shaft gear (4) to drive the secondary shaft (2) to rotate.

2. The safety gear type transmission according to claim 1, wherein: The main shaft gear (3) and the secondary shaft gear (4) are one-gear of the gearbox.

3. The safety gear type transmission according to claim 1, wherein: The secondary shaft (2) is provided with a pawl slot (21), the pawl (5) is provided with a mounting portion (51) matched with the pawl slot (21), and the mounting portion (51) is mounted on the pawl slot (21).

4. The safety type gear box according to claim 3, wherein: The pawl (5) is further provided with a pawl portion (52), one side of the pawl portion (52) is provided with an arc-shaped sliding surface (521), and the other side of the pawl portion (52) is provided with an engagement surface (522).

5. The safety gear interlock type transmission according to claim 4, wherein: The pawl (5) is provided with a first fixing slot (53), the secondary shaft (2) is provided with a second fixing slot (22), the reset member (6) is a ring-shaped spring, the reset member (6) is embedded in the first fixing slot (53) and the second fixing slot (22) to mount the pawl (5) on the secondary shaft (2); the reset member (6) always makes the pawl portion (52) of the pawl (5) protrude out of the pawl slot (21).

6. The safety gear type transmission according to claim 1, wherein: The pawl (5) is provided with three pawls, and the three pawls (5) are evenly distributed on the secondary shaft (2).

7. The safety gear type transmission according to claim 1, wherein: The transmission further comprises a plurality of main shaft gear shifting gears (10) mounted on the main shaft (1), a secondary shaft gear shifting gear (20) mounted on the secondary shaft (2) and engaged with the main shaft gear shifting gears, and a gear shifting control system (30).

8. A bicycle characterized by: The bicycle comprises the anti-idling safety transmission of any one of claims 1-7.

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