Shifting and tooth skipping prevention shifting mechanism

Abstract

The shifting mechanism capable of preventing shifting and tooth skipping comprises a shifting assembly, a guiding assembly and a locking assembly. The shifting assembly comprises a shifting block assembly, and the shifting block assembly is fixedly connected to the shifting shaft; the shifting block assembly comprises a shifting fork and a shifting block, and the shifting block is fixedly connected with the shifting fork; a first locking groove and a second locking groove are formed in the periphery of the shifting fork; the periphery of the shifting block is provided with shifting teeth, a first clamping groove corresponding to the first locking groove in position and a second clamping groove corresponding to the second locking groove. The shifting teeth are located between the first clamping groove and the second clamping groove. The locking assembly is provided with a locking piece which moves under the action of the elastic piece, and the guiding assembly enables the locking piece to move along a straight line; locking teeth and a conical boss are arranged at the outer end of the locking piece, the conical boss is matched with the shifting teeth in structure, the shifting teeth push the conical boss to enter the first clamping groove and the second clamping groove, and the locking teeth bounce into the first locking groove and the second locking groove.

Description

Technical Field

[0001] The utility model relates to the field of transmissions, in particular to a toggle mechanism for preventing deviation and tooth jumping. Background Art

[0002] Existing shift fork locking devices in the transmission cases of three-wheeled motorcycles generally use a structure that combines a steel ball with a compression spring. Two grooves corresponding to the steel balls are provided on the shift fork. During the gear shifting operation, the shift fork rotates driven by the shift shaft, and the steel ball exits one of the grooves. After the gear is shifted, the steel ball enters the other groove, where the compression spring locks the shift fork. During this process, the steel ball both rolls and slides. In this structure, the steel ball easily exits the groove, and the locking reliability is poor. Especially after long-term use, the groove becomes strained and deformed, which can easily cause gear jumping, leading to safety accidents. Moreover, current three-wheeled and four-wheeled motorcycles are often overloaded, and the load acting on the transmission system and transmitted to the shift fork can easily overload, making it more likely that the steel ball will exit the groove and cause gear jumping. Therefore, in order to solve the above problems, a shifting mechanism that prevents offset and tooth jumping is needed. Utility Model Content

[0003] In view of the shortcomings of the existing technology, the utility model proposes a toggle mechanism with simple structure, reliable operation and no offset and tooth jumping. The specific technical solution is as follows:

[0004] A toggle mechanism for preventing tooth deviation and jumping, comprising a toggle assembly, a guide assembly, and a locking assembly;

[0005] The toggle assembly includes a toggle block assembly, and the toggle block assembly is fixedly connected to the toggle shaft;

[0006] The shift block assembly includes a shift fork and a shift block, the shift block being fixedly connected to the shift fork; a first locking groove and a second locking groove are provided on the outer periphery of the shift fork; a shift tooth, a first clamping groove corresponding to the position of the first locking groove, and a second clamping groove corresponding to the second locking groove are provided on the outer periphery of the shift block, the shift tooth being located between the first clamping groove and the second clamping groove; the locking assembly has a locking member that moves under the action of an elastic member, and the guide assembly enables the locking member to move in a straight line; a locking tooth and a conical boss are provided at the outer end of the locking member, the conical boss is adapted to the structure of the shift tooth, the shift tooth pushes the conical boss into the first clamping groove and the second clamping groove, and the locking tooth bounces into the first locking groove and the second locking groove.

[0007] As an optimization:

[0008] A limiting groove is provided at the bottom of the shift block, and the limiting groove is a V-shaped structure. A limiting block adapted to the limiting groove structure is provided on the side of the shift fork adjacent to the shift block, and the limiting block is located in the limiting groove.

[0009] As an optimization:

[0010] The locking assembly includes a locking member, an elastic member and a mounting sleeve; the locking member adopts a locking pin, the elastic member adopts a spring, the mounting sleeve is connected to the box body, one end of the spring is connected to the mounting sleeve, and the other end of the spring and the locking pin are connected to the mounting sleeve through the spring; the inner end of the locking pin is connected to the mounting sleeve through the spring, and a guide groove is axially opened on the outer periphery of the outer end of the locking pin, and the free end of the guide pin extends into the guide groove.

[0011] As an optimization:

[0012] The guide assembly includes a connecting frame and a guide part. The connecting frame is fixedly connected to the box body. The guiding part is connected to the connecting frame, and the guiding part adopts a guide pin.

[0013] As an optimization:

[0014] An annular boss is provided on one side of the shift block, and the annular boss is arranged coaxially with the shaft hole. The shift fork is fixedly sleeved on the annular boss, and the shift fork and the annular boss are in interference fit.

[0015] The beneficial effects of the present invention are: a simple overall structure; the shifting assembly, guide assembly, and locking assembly stably lock the shift fork after shifting, preventing shifting. A spring acts to push the locking pin to engage the first and second locking grooves. The guide pin guides the locking member of the locking assembly, allowing the locking pin to move axially along the guide groove, preventing rotational deviation of the locking pin. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is the overall schematic diagram of the transmission box;

[0017] Figure 2 This is a schematic diagram of the connection between the operating component, transmission component, and anti-drift and tooth-jump shift mechanism in the box;

[0018] Figure 3 It is a cross-sectional view of the box body with the first shaft hole, the second shaft hole, and the third shaft hole;

[0019] Figure 4 It is a schematic diagram of the connection between the operating assembly, transmission assembly and toggle mechanism and the box;

[0020] Figure 5 It is a transmission diagram of the operating component, transmission component, toggle mechanism, and forward and reverse gear shift assembly;

[0021] Figure 6 For the forward and reverse gear shift assembly;

[0022] Figure 7 This is the installation diagram of the forward and reverse gear shift assembly in the box;

[0023] Figure 8 This is a schematic diagram of the connection between the locking assembly and the box;

[0024] Figure 9 The structural diagram of the gear shift mechanism to prevent offset and tooth jumping;

[0025] Figure 10 This is a schematic diagram of the toggle component;

[0026] Figure 11 Schematic diagram of the shift block assembly;

[0027] Figure 12 Schematic diagram of the locking assembly;

[0028] Figure 13 It is the structure diagram of the locking pin;

[0029] Figure 14 This is a block structure diagram;

[0030] The accompanying drawings are as follows:

[0031] Box body 1, first shaft hole 1-1, second shaft hole 1-2, third shaft hole 1-3, secondary shaft 2;

[0032] Forward and reverse gear shift assembly 3, output shaft 3-1, driving bevel gear 3-2, forward bevel gear 3-3, reverse bevel gear 3-4, sliding sleeve 3-5, annular groove 3-6;

[0033] Operating assembly 4, operating lever 4-1, pedal 4-2;

[0034] Shift assembly 5, shift shaft 5-1, shift block assembly 5-2, shift tooth 5-21, shift fork 5-22, first locking groove 5-23, second locking groove 5-24, shift block 5-25, first clamping groove 5-26, second clamping groove 5-27, annular boss 5-28, limiting groove 5-29, limiting block 5-30;

[0035] Transmission assembly 6, first sector gear 6-1, transmission gear 6-2, second sector gear 6-3;

[0036] Guide assembly 7, connecting frame 7-1, guide pin 7-2;

[0037] Locking assembly 8, spring 8-1, mounting sleeve 8-2, locking pin 8-3, guide groove 8-4, locking tooth 8-5, tapered boss 8-6. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0039] In the description of this utility model, it should be noted that the terms "vertical," "upper," "lower," and "horizontal," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0040] like Figure 1 、 Figure 2 As shown:

[0041] The engine shift mechanism includes a housing 1, a forward and reverse gear shift assembly 3, an operating component 4, a transmission component 6, and a toggle mechanism for preventing deviation and tooth jumping.

[0042] Among them, the toggle mechanism for preventing deviation and tooth jumping includes a toggle component 5, a guide component 7 and a locking component 8;

[0043] The countershaft 2 and the forward and reverse gear shift assembly 3 are installed in the case 1. The countershaft 2 and the forward and reverse gear shift assembly 3 are both existing standard components. The countershaft 2 is connected to the input part of the forward and reverse gear shift assembly 3 through a gear pair to provide power input for the forward and reverse gear shift assembly 3. The output part of the forward and reverse gear shift assembly 3 extends out of the case 1 and is connected to the wheel drive shaft. The forward and reverse gear shift assembly 3 realizes the forward / reverse function of the vehicle by driving the wheel drive shaft to rotate clockwise / counterclockwise.

[0044] like Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5As shown, the inner end of the operating assembly 4 extends into the housing 1. The transmission assembly 6 is located within the housing 1. The operating assembly 4 drives the shift fork 5-22 in the shift assembly 5 through the transmission assembly 6 to shift the sliding sleeve 3-5 in the forward / reverse gear shift assembly 3, causing the sliding sleeve 3-5 to form a spline connection with the forward bevel gear 3-3 / reverse bevel gear 3-4, thereby achieving forward / reverse shift position switching of the forward / reverse gear shift assembly 3. At the same time, the locking pin 8-3 in the locking assembly 8 locks the shift fork 5-22 assembly, ensuring that the spline connection formed between the sliding sleeve 3-5 and the forward bevel gear 3-3 / reverse bevel gear 3-4 remains stable. The output portion of the forward / reverse gear shift assembly 3 is connected to the wheel drive shaft. The forward / reverse gear shift assembly 3 drives the wheel drive shaft to rotate clockwise / counterclockwise to achieve the vehicle's forward / reverse function.

[0045] like Figure 6 、 Figure 7 As shown, the forward and reverse gear shift assembly 3 is installed in the box body 1. The forward and reverse gear shift assembly 3 is an existing mature accessory. The forward and reverse gear shift assembly 3 includes an output shaft 3-1, a driving bevel gear 3-2, a forward bevel gear 3-3, a reverse bevel gear 3-4, and a sliding sleeve 3-5.

[0046] The driving bevel gear 3-2 is meshed with the forward bevel gear 3-3 and the reverse bevel gear 3-4 respectively.

[0047] The sliding sleeve 3-5 is spline-connected to the output shaft 3-1, and an annular groove 3-6 is formed on the outer periphery of the sliding sleeve 3-5 along the annular direction.

[0048] The sliding sleeve 3-5 is located between the forward bevel gear 3-3 and the reverse bevel gear 3-4. The sliding sleeve 3-5 slides on the output shaft 3-1, so that the sliding sleeve 3-5 is spline-connected with the forward bevel gear 3-3 / reverse bevel gear 3-4, realizing the forward rotation / reversal of the output shaft 3-1.

[0049] like Figure 10 As shown, the toggle assembly 5 includes a toggle shaft 5-1 and a toggle block assembly 5-2. The toggle shaft 5-1 is rotatably connected in the box body 1, and the toggle block assembly 5-2 is fixedly connected to the toggle shaft 5-1. The operating assembly 4 drives the toggle shaft 5-1 to rotate clockwise / counterclockwise along the axis through the transmission assembly 6. The shift fork 5-22 in the toggle assembly 5 toggles the sleeve 3-5 in the forward and reverse gear shift assembly 3, so that the sleeve 3-5 forms a spline connection with the forward bevel gear 3-3 / reverse bevel gear 3-4, realizing the forward / reverse shift position switching of the forward and reverse gear shift assembly 3. The output part of the forward and reverse gear shift assembly 3 is connected to the wheel drive shaft. The forward and reverse gear shift assembly 3 realizes the forward / reverse function of the vehicle by driving the wheel drive shaft to rotate clockwise / counterclockwise.

[0050] like Figure 3As shown, a first shaft hole 1 - 1 , a second shaft hole 1 - 2 and a third shaft hole 1 - 3 whose aperture axes are parallel to the secondary shaft 2 are opened in the box body 1 .

[0051] The operating assembly 4 includes an operating rod 4-1 and a pedal 4-2. The inner end of the operating rod 4-1 penetrates into the box body 1 through the first shaft hole 1-1, and the pedal 4-2 is fixedly connected to the outer end of the operating rod 4-1.

[0052] like Figure 2 、 Figure 3 、 Figure 4 As shown, the transmission assembly 6 includes a first sector gear 6-1, a transmission gear 6-2, and a second sector gear 6-3. The first sector gear 6-1 is fixedly sleeved on the inner end of the operating lever 4-1, and the middle part of the transmission gear 6-2 is connected to one end of the connecting pin. The other end of the connecting pin is passed through the second shaft hole 1-2, and the inner end of the toggle shaft 5-1 is rotatably connected to the third shaft hole 1-3. The second sector gear 6-3 is fixedly sleeved on the toggle shaft 5-1. The first sector gear 6-1 and the second sector gear 6-3 are respectively engaged with the transmission gear 6-2. When the operating lever 4-1 is rotated, the first sector gear 6-1 drives the transmission gear 6-2 to rotate, and the transmission gear 6-2 drives the second sector gear 6-3 to rotate. The second sector gear 6-3 drives the toggle shaft 5-1 to rotate synchronously, and the toggle shaft 5-1 drives the toggle block assembly 5-2 to toggle the sliding sleeve 3-5 in the forward and reverse gear shift assembly 3.

[0053] like Figure 11 As shown, the shift block assembly 5-2 includes a shift fork 5-22 and a shift block 5-25. The shift fork 5-22 is fixedly connected to the shift block 5-25. The shift shaft 5-1 drives the shift block 5-25 to rotate, and the shift block 5-25 drives the shift fork 5-22 to rotate. The shift end of the shift fork 5-22 extends into the annular groove of the sliding sleeve 3-5. The shift fork 5-22 shifts the sliding sleeve 3-5, and the shift block 5-25 assists in pushing the locking member in the locking assembly 8.

[0054] An axial hole is provided on the side of the shift block 5-25, and the end of the shift shaft 5-1 is passed through the axial hole. The shift shaft 5-1 and the shift block 5-25 are spline-connected.

[0055] An annular boss 5-28 is provided on one side of the shift block 5-25, and the annular boss 5-28 is arranged coaxially with the shaft hole. The shift fork 5-22 is fixedly mounted on the annular boss 5-28. The shift fork 5-22 and the annular boss 5-28 are interference fit. A limiting groove 5-29 is provided at the bottom of the shift block 5-25. The limiting groove 5-29 is a V-shaped structure. A limiting block 5-30 adapted to the structure of the limiting groove 5-29 is provided on the side of the shift fork 5-22 close to the shift block 5-25, and the limiting block 5-30 is located in the limiting groove 5-29.

[0056] The outer periphery of the shift fork 5-22 is provided with a first locking groove 5-23 and a second locking groove 5-24 for engaging with the locking member.

[0057] A shift tooth 5-21, a first card slot 5-26 corresponding to the first locking slot 5-23, and a second card slot 5-27 corresponding to the second locking slot 5-24 are provided on the outer periphery of the shift block 5-25. The shift tooth 5-21 is located between the first card slot 5-26 and the second card slot 5-27.

[0058] like Figure 8 、 Figure 9 、 Figure 10 、 Figure 12 、 Figure 13 As shown, the locking mechanism includes a guide assembly 7 and a locking assembly 8, which are connected in the box body 1. The locking assembly 8 has a locking member that moves under the action of an elastic member. The guide portion guides the locking member of the locking assembly 8, so that the locking pin 8-3 moves along a fixed path to prevent the locking pin 8-3 from rotating and deviating.

[0059] The locking assembly 8 includes a locking part, an elastic part and a mounting sleeve 8-2. The locking part adopts a locking pin 8-3, the elastic part adopts a spring 8-1, the mounting sleeve 8-2 is connected to the box body 1, one end of the spring 8-1 is connected to the sleeve, and the other end of the spring 8-1, the locking pin 8-3 is connected to the mounting sleeve 8-2 through the spring 8-1.

[0060] The guide assembly 7 includes a connecting frame 7-1 and a guide part. The connecting frame 7-1 is fixedly connected to the box body 1. The guide part is connected to the connecting frame 7-1. The guide part adopts a guide pin 7-2. The locking pin 8-3 is cylindrical. A locking tooth 8-5 and a conical boss 8-6 are adjacent to each other at the outer end of the locking pin 8-3. The conical boss 8-6 is adapted to the structure of the shifting tooth 5-21. The shifting tooth 5-21 drives the conical boss 8-6 to enter the first groove / second groove. Under the action of the spring 8-1, the locking pin 8-3 pushes the locking tooth 8-5 to be stuck in the first locking groove 5-23 / second locking groove 5-24.

[0061] The inner end of the locking pin 8-3 is connected to the mounting sleeve 8-2 through a spring 8-1. A guide groove 8-4 is axially provided on the outer periphery of the outer end of the locking pin 8-3, and the free end of the guide pin 7-2 extends into the guide groove 8-4.

[0062] Working process of this embodiment:

[0063] The countershaft 2 is connected to the input part of the forward and reverse gear shift assembly 3 through a gear pair to provide power input for the forward and reverse gear shift assembly 3. The output part of the forward and reverse gear shift assembly 3 extends out of the box body 1 and is connected to the wheel drive shaft.

[0064] When the sliding sleeve 3-5 is spline-connected with the forward bevel gear 3-3 / reverse bevel gear 3-4, the driving bevel gear 3-2 in the forward-reverse gear shift assembly 3 drives the forward bevel gear 3-3 and the reverse bevel gear to idle relative to the output shaft 3-1.

[0065] When the pedal 4-2 is pressed counterclockwise, the operating lever 4-1 rotates counterclockwise, the first sector gear 6-1 drives the transmission gear 6-2 to rotate clockwise, the transmission gear 6-2 drives the second sector gear 6-3 to rotate counterclockwise, and the second sector gear 6-3 drives the shifting shaft 5-1 to rotate synchronously. When the shifting shaft 5-1 drives the shifting block assembly 5-2 to shift the sliding sleeve 3-5, the sliding sleeve 3-5 forms a spline connection with the forward bevel gear 3-3.

[0066] Specifically, the shifting tooth 5-21 drives the conical boss 8-6 into the first locking groove 5-26. The locking pin 8-3, under the action of the spring 8-1, pushes the locking tooth 8-5 to engage the first locking groove 5-23. The guide pin 7-2 guides the locking member of the locking assembly 8, causing the locking pin 8-3 to move axially along the guide groove 8-4, thereby preventing the locking pin 8-3 from rotating and deviating. The forward bevel gear 3-3 drives the output shaft 3-1 to rotate through the sliding sleeve 3-5. The output shaft 3-1 drives the wheel drive shaft to rotate, so that the tricycle can move forward.

[0067] When the pedal 4-2 is stepped on clockwise, the operating rod 4-1 rotates clockwise, the first sector gear 6-1 drives the transmission gear 6-2 to rotate counterclockwise, the transmission gear 6-2 drives the second sector gear 6-3 to rotate clockwise, and the second sector gear 6-3 drives the shifting shaft 5-1 to rotate synchronously. When the shifting shaft 5-1 drives the shifting block assembly 5-2 to shift the sliding sleeve 3-5, the sliding sleeve 3-5 forms a spline connection with the reverse bevel gear 3-4.

[0068] Specifically, the shifting tooth 5-21 drives the conical boss 8-6 into the second slot 5-27. Under the action of the spring 8-1, the locking pin 8-3 pushes the locking tooth 8-5 to engage in the second locking slot 5-24. The guide pin 7-2 guides the locking part of the locking assembly 8, so that the locking pin 8-3 moves axially along the guide slot 8-4 to prevent the locking pin 8-3 from rotating and offsetting.

[0069] The backward bevel gear 3-4 drives the output shaft 3-1 to rotate through the sliding sleeve 3-5, and the output shaft 3-1 drives the wheel drive shaft to rotate, thereby realizing the reverse movement of the tricycle. At the same time, the locking pin 8-3 in the locking assembly 8 locks the shift fork 5-22 assembly, so that the sliding sleeve 3-5 and the backward bevel gear 3-4 remain stable.

[0070] The shifting tooth 5-21 drives the conical boss 8-6 into the first slot 5-26 / the second slot 5-27. Under the action of the spring 8-1, the locking pin 8-3 pushes the locking tooth 8-5 to engage in the first locking slot 5-23 / the second locking slot 5-24. The guide pin 7-2 guides the locking part of the locking assembly 8, so that the locking pin 8-3 moves axially along the guide slot 8-4 to prevent the locking pin 8-3 from rotating and deviating.

[0071] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed within the present invention. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0072] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. The toggle mechanism for preventing tooth deviation and tooth jumping is characterized by: It includes a toggle assembly, a guide assembly and a locking assembly; The toggle assembly includes a toggle block assembly, and the toggle block assembly is fixedly connected to the toggle shaft; The shift block assembly includes a shift fork and a shift block, and the shift block is fixedly connected to the shift fork; The outer periphery of the shift fork is provided with a first locking groove and a second locking groove; A shifting tooth, a first clamping groove corresponding to the first locking groove, and a second clamping groove corresponding to the second locking groove are provided on the outer periphery of the shifting block, and the shifting tooth is located between the first clamping groove and the second clamping groove; The locking assembly comprises a locking member that moves under the action of an elastic member, and the guide assembly enables the locking member to move in a straight line; A locking tooth and a conical boss are provided at the outer end of the locking member. The conical boss is adapted to the structure of the shifting tooth. The shifting tooth pushes the conical boss into the first and second slots, and the locking tooth bounces into the first and second locking slots.

2. The anti-drift tooth jumping toggle mechanism according to claim 1, characterized in that: A limiting groove is provided at the bottom of the shift block, and the limiting groove is a V-shaped structure. A limiting block adapted to the limiting groove structure is provided on the side of the shift fork adjacent to the shift block, and the limiting block is located in the limiting groove.

3. The anti-drift tooth jumping toggle mechanism according to claim 1, characterized in that: The locking assembly includes a locking member, an elastic member and a mounting sleeve; The locking member is a locking pin, the elastic member is a spring, the mounting sleeve is connected to the box body, one end of the spring is connected to the mounting sleeve, and the other end of the spring and the locking pin are connected to the mounting sleeve through the spring; The inner end of the locking pin is connected to the mounting sleeve through a spring. A guide groove is axially provided on the outer periphery of the outer end of the locking pin, and the free end of the guide pin extends into the guide groove.

4. The anti-drift tooth jumping toggle mechanism according to claim 1, characterized in that: The guide assembly includes a connecting frame and a guide part. The connecting frame is fixedly connected to the box body. The guiding part is connected to the connecting frame, and the guiding part adopts a guide pin.

5. The toggle mechanism for preventing tooth deviation and tooth jumping according to claim 1, characterized in that: An annular boss is provided on one side of the shift block, and the annular boss is arranged coaxially with the shaft hole. The shift fork is fixedly sleeved on the annular boss, and the shift fork and the annular boss are in interference fit.

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