A lateral positioning assembly and commutating drive mechanism for a rotating shaft

Abstract

The utility model relates to gear shifting mechanism technical field, specifically disclose a kind of lateral positioning assembly for rotating shaft, including the limiting plate of fixed connection on rotating shaft, multiple limiting recesses are set up on the outer periphery of limiting plate, limiting recess is arranged along rotating shaft periphery, still include the elastic positioning unit of installation on the box or support opposite fixed with rotating shaft, and elastic positioning unit includes elastic member and by the rolling wheel of elastic member resistance pressure;Wherein, rolling wheel is under the pre-tightening force of elastic member, and resistance is tight in limiting recess. Reversing drive mechanism, including rotating shaft and the drive unit of driving rotating shaft rotation, further include lateral positioning assembly for rotating shaft. The present application is used to solve the problem of insufficient gear feeling clarity of the current clamping lock mechanism.

Description

Technical Field

[0001] This utility model relates to the field of shifting mechanism technology, specifically to a lateral positioning component and a reversing drive mechanism for a rotating shaft. Background Technology

[0002] In mechanical equipment, different gear shifts are often achieved through the rotation of a rotating shaft, such as in a gearbox. The rotating gear hub, acting as a rotating shaft, drives the shift fork to move, thus shifting gears to achieve different reduction ratios or different directions. This type of gear shifting is commonly found in vehicles and agricultural machinery. To ensure stable operation in a specific gear after shifting, the rotating shaft must be reliably positioned and locked after rotating to a specific angle; this is known as the locking function (also called the positioning or locking function).

[0003] There are various positioning and locking solutions for gear shifting mechanisms in the existing technology. For example, patent document CN217081385U discloses a gear shifting mechanism that uses a P-position cam on the shift shaft to push a pawl to engage with a ratchet to achieve parking lock. However, this requires designing the cam profile according to the gear position requirements and cooperating with the ratchet and pawl, resulting in a complex structure. Furthermore, because the ratchet has many shallow grooves, the pawl's hook and the grooves do not provide sufficient locking force, resulting in poor tactile and audible feedback during locking, i.e., a poor gear locking feel.

[0004] Another patent document, CN114439935A, provides a skip-gear shifting mechanism that uses an independent locking drum in conjunction with a retractable locking element (such as a telescopic cylinder) to switch between sequential and skip-gear shifting. While this solution achieves independent locking functionality, its locking mechanism has significant shortcomings: First, its locking relies on active control via pneumatic or electromagnetic drive; in the event of a power outage or air supply failure, the locking function will fail, posing a safety hazard and indicating insufficient reliability. Second, the engagement between the locking element (piston rod) and the locking groove is a simple pin-type structure, which is prone to impact and wear under frequent shifting and vibration conditions, resulting in poor locking stability and durability. Finally, this structure fails to provide the operator with a clear sense of gear locking. Utility Model Content

[0005] The present invention aims to provide a lateral positioning component for a rotating shaft to solve the problem of insufficient clarity of gear position feel in the current locking mechanism.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A lateral positioning assembly for a rotating shaft includes a limiting plate fixedly connected to the rotating shaft. The limiting plate has multiple limiting grooves on its outer periphery, which are arranged circumferentially along the rotating shaft. The assembly also includes an elastic positioning unit mounted on a housing or bracket fixed relative to the rotating shaft. The elastic positioning unit includes an elastic element and a rolling wheel pressed by the elastic element. The rolling wheel is pressed against the limiting grooves by the preload of the elastic element.

[0007] The principle and advantages of this solution are as follows: This solution achieves a compact and powerful lateral positioning function by using a limiting plate and a limiting groove on the side of the rotating shaft, in conjunction with an elastically pressing rolling wheel. This design directly applies the locking force to the side of the rotating shaft, effectively improving the positioning rigidity and impact resistance. At the same time, the surface contact between the rolling wheel and the limiting groove, as well as the clear jolt when passing over the groove edge, ensures the stability and durability of the locking mechanism and provides the operator with clear and unambiguous gear feedback. Preferably, as an improvement, the limiting groove is a curved groove, and a protrusion is formed between adjacent limiting grooves.

[0008] Preferably, as an improvement, the elastic positioning unit further includes a pressure arm, which is rotatably connected to the housing or bracket, and a rolling wheel is rotatably connected to the cantilever section of the pressure arm. The elastic element is a torsion spring sleeved at the rotation center of the pressure arm, with one end of the torsion spring fixed to the pressure arm and the other end fixed to the housing or bracket, so that the elastic positioning unit has a simple structure and is easy to install.

[0009] This utility model also provides a reversing drive mechanism, including a rotating shaft and a drive unit that drives the rotating shaft to rotate, and also includes the lateral positioning component for the rotating shaft.

[0010] Preferably, as an improvement, multiple connecting columns are fixed on the rotating shaft, the multiple connecting columns are distributed circumferentially about the rotating shaft and parallel to the rotating shaft; the driving unit includes a driving shaft rotatably connected to the housing, a swing arm fixed to the driving shaft, and a driving hook rotatably connected to the end of the swing arm; the driving hook has a hook portion that can hook onto the connecting column, and the hook portion and the rolling wheel are arranged axially offset from each other on the rotating shaft; an elastic body is provided between the driving hook and the swing arm to force the driving hook to maintain the hooked state.

[0011] Preferably, as an improvement, the connecting post is inserted into the end face or step surface of the rotating shaft, and the limiting plate is detachably connected to the rotating shaft. The end face of the limiting plate facing the connecting post abuts against all the connecting posts, so that when multiple connecting posts are installed, they only need to be inserted into the rotating shaft first, and then when the limiting plate is installed, the end face of the limiting plate is used to simultaneously press all the connecting posts against the rotating shaft, thereby fixing the limiting plate and connecting posts on the rotating shaft. The whole operation is simple and convenient.

[0012] Preferably, as an improvement, the drive unit includes a drive shaft and a drive wheel. The drive shaft is rotatably connected to the housing, the drive wheel is fixed to the drive shaft, and a driven wheel is fixed on the rotating shaft. The drive wheel and the driven wheel are connected by one of chain drive, belt drive, and gear drive.

[0013] Beneficial effects: This solution provides a flexible drive solution. When the drive source cannot be directly installed near the rotating shaft due to equipment structure limitations (e.g., the position of the drive source input shaft is fixed to achieve universal housing), the rotational motion of the remote drive shaft can be reliably transmitted to the rotating shaft through this drive shaft, swing arm, drive hook, or through drive shaft, drive wheel, and driven wheel. This achieves rotational drive of the rotating shaft without changing the existing housing structure and overall layout, ensuring that the forward and reverse rotation of the rotating shaft is not affected and that all gear adjustments can be achieved.

[0014] Preferably, as an improvement, the drive shaft extends out of the housing and is fixed with a pedal, so that the operator can step on the pedal to rotate the drive shaft, thereby driving the rotation of the rotating shaft.

[0015] Preferably, as an improvement, a shift fork is fitted on the rotating shaft, a cylindrical cam groove is provided on the rotating shaft, and a protrusion that cooperates with the cam groove is provided on the shift fork, so that a cylindrical cam connection structure is formed between the rotating shaft and the shift fork.

[0016] Preferably, as an improvement, the cylindrical cam groove is composed of an S-shaped groove arranged spirally along the axis of rotation, and both ends of the S-shaped groove are connected to a locking groove section; the locking groove section is a tangential groove extending circumferentially along the axis of rotation, and its length direction is perpendicular to the axial direction of the axis of rotation. Beneficial effects: This solution creates two stable mechanical locking positions by setting locking grooves at both ends of the S-shaped groove of the spiral. When the protrusion slides into the locking groove, the rotating shaft can rotate at a certain angle without moving the shift fork, thus achieving reliable locking of the gear position through the mechanical structure itself. This effectively prevents disengagement due to vibration and provides the operator with a clear feel for engaging the gear.

[0017] Preferably, as an improvement, the cylindrical cam groove is further provided with a neutral groove section in the middle. The neutral groove section is a tangential groove extending circumferentially along the rotation axis. The neutral groove section is parallel to the locking groove section. The presence of the neutral groove section makes the trajectory of the S-shaped groove formed by connecting two spiral grooves through the neutral groove section.

[0018] Beneficial effects: This design adds a neutral slot section in the middle of the S-shaped groove, thus integrating three gear settings on a single cylindrical cam groove. These three gears can be forward, neutral, and reverse, providing three stable positions. The addition of the neutral position allows the operator to clearly cut off power.

[0019] Preferably, as an improvement, the rotating shaft is provided with an identification part for identifying the gear position; it also includes a position sensor for matching the identification part, the position sensor being used to sense the corresponding identification part when the rotating shaft rotates to the corresponding gear position.

[0020] Beneficial effects: This solution achieves a reliable gear position detection mechanism by setting physical features corresponding to each gear position on the identification part that rotates synchronously with the rotating shaft and using a position sensor to sense them in real time. This mechanism can convert the absolute angular position of the rotating shaft into an accurate electrical signal output, thereby providing precise gear position status feedback for the control system. Attached Figure Description

[0021] Figure 1 This is a three-dimensional structural diagram of Embodiment 1 of the present invention.

[0022] Figure 2 for Figure 1 The main view.

[0023] Figure 3 for Figure 1 Top view.

[0024] Figure 4 for Figure 3 AA section view in the image.

[0025] Figure 5 This is a three-dimensional structural diagram of Embodiment 2 of the present invention.

[0026] Figure 6 for Figure 5 The main view.

[0027] Figure 7 for Figure 5 Top view.

[0028] Figure 8 for Figure 7 BB section view in the middle.

[0029] Figure 9 This is a three-dimensional structural diagram of the driving unit in Scheme 2 of this embodiment.

[0030] Figure 10 This is a schematic diagram of the explosion state of the shift fork on the rotating shaft and the slidable part in Embodiment 2.

[0031] Figure 11 This is a partial structural diagram of the rotating shaft in Embodiment 2 (showing the relationship between the cam groove and the protrusion on the rotating shaft).

[0032] Figure 12 for Figure 11 A schematic diagram of the three-dimensional structure after rotation.

[0033] Figure 13 for Figure 12 The front view shows the cam groove with a neutral slot section.

[0034] Figure 14 This is a schematic diagram of the cam groove of the rotating shaft in Embodiment 2 without the neutral groove section.

[0035] The reference numerals in the accompanying drawings include: rotating shaft 1, connecting column 11, limiting plate 12, limiting groove 121, elastic positioning unit 2, pressing arm 21, elastic element 22, rolling wheel 23, driving unit 3, driving shaft 31, driving wheel 30, driven wheel 10, swing arm 311, driving hook 312, hook part 3121, elastic body 313, pedal 32, cam groove 101, identification part 102, gear groove 102, locking groove section 1011, neutral groove section 1012, shift fork 4, protruding column 41, and slidable part 5. Detailed Implementation

[0036] The following detailed description illustrates the specific implementation method: Example 1 Combination Figures 1 to 4 A lateral positioning assembly for a rotating shaft includes a limiting plate 12 fixedly connected to the end of a rotating shaft 1 by screws. Multiple limiting grooves 121 are formed on the outer periphery of the limiting plate 12, arranged circumferentially around the rotating shaft 1. The limiting grooves 121 are curved grooves, and protrusions are formed between adjacent limiting grooves 121. The end of the rotating shaft 1 on which the limiting plate 12 is mounted has a step. Multiple connecting posts 11 are inserted into the step surface of the rotating shaft 1. One end of each connecting post 11 is inserted into the rotating shaft 1, and the other end is pressed against the end face of the limiting plate 12 facing the step surface, thereby achieving fixed installation of the connecting posts 11 on the rotating shaft 1. The connecting posts 11 are cylindrical, and the multiple connecting posts 11 are evenly distributed circumferentially about the rotating shaft 1.

[0037] It also includes an elastic positioning unit 2 installed on a housing or bracket that is fixed relative to the rotating shaft 1. In this embodiment, the unit is installed on the housing.

[0038] The elastic positioning unit 2 includes a pressing arm 21, an elastic element 22, and a rolling wheel 23 pressed by the elastic element 22. The pressing arm 21 is rotatably connected to the housing, and the rolling wheel 23 is rotatably connected to the cantilever end of the pressing arm 21. The elastic element 22 is a torsion spring sleeved at the rotation center of the pressing arm 21, with one end fixed to the pressing arm 21 and the other end fixed to the housing. Under the preload of the elastic element 22, the rolling wheel 23 presses against the limiting groove 121, and the rolling wheel 23 contacts the surface of the limiting groove 121.

[0039] In this embodiment, the rotating pressure arm 21, in conjunction with the torsion spring, provides preload to the rolling wheel 23, enabling the elastic positioning unit 2 to automatically adapt and remain firmly pressed within the limiting groove 121. When the rotating shaft 1 rotates, the rolling wheel 23, under the continuous pressure of the torsion spring, experiences a distinct jolt as it passes over the groove edge (protrusion). After passing over, the rolling wheel 23 presses against the curved bottom of the limiting groove 121 in a surface contact manner, thereby ensuring the stability of the locking.

[0040] Example 2 Combination Figures 5 to 14 This embodiment 2 provides a reversing drive mechanism, including a rotating shaft 1, a drive unit 3 that drives the rotating shaft 1 to rotate, and also includes the clamping assembly for the rotating shaft 1 from embodiment 1.

[0041] In one embodiment, if the axial space of the rotating shaft 1 is available, the drive unit 3 can be directly installed on the rotating shaft 1. The drive unit 3 can be, for example, a motor, or a pedal 32 fixedly installed on the rotating shaft 1. The rotating shaft 1 can be controlled to rotate by stepping on the pedal 32.

[0042] In another embodiment, the axial space of the rotating shaft 1 is unusable, so the drive unit 3 can be either Scheme 1 or Scheme 2.

[0043] Option 1: Combining Figures 5 to 8 The drive unit 3 includes a drive shaft 31, a swing arm 311 fixed on the drive shaft 31, and a drive hook 312 rotatably connected to the end of the swing arm 311. The drive shaft 31 is still rotatably connected to the housing, and the drive shaft 31 is parallel to the rotation shaft 1. The drive hook 312 has a hook portion 3121 that can hook onto the connecting post 11, and the hook portion 3121 and the rolling wheel 23 are arranged axially offset from each other on the rotation shaft 1. An elastic body 313 is provided between the drive hook 312 and the swing arm 311 to force the drive hook 312 to remain in the hooked state.

[0044] Option 2: Combining Figure 9 The drive unit 3 includes a drive shaft 31 and a drive wheel 30. The drive shaft 31 is rotatably connected to the housing and is parallel to the rotating shaft 1. The drive wheel 30 is fixed on the drive shaft 31. A driven wheel 10 is fixed on the rotating shaft 1. The drive wheel 30 and the driven wheel 10 are connected by one of chain drive, belt drive, or gear drive. The attached figure* shows a belt drive as an example.

[0045] Scheme 1 and Scheme 2 in this embodiment provide a flexible drive solution. When the drive source cannot be directly installed near the rotating shaft 1 due to equipment structure limitations (e.g., the position of the drive source input is fixed to achieve universal housing), the rotational motion of the remote drive shaft 31 can be reliably transmitted to the rotating shaft 1 through the drive shaft 31, swing arm 311, drive hook 312, or through the drive shaft 31, drive wheel 30, driven wheel 10. This achieves rotational drive of the rotating shaft 1 without changing the existing housing structure and overall layout, ensuring that the forward and reverse rotation of the rotating shaft 1 is not affected and that the adjustment of each gear can be realized.

[0046] In one embodiment, the drive shaft 31 extends out of the housing and is fixed with a pedal 32 so that the operator can step on the pedal 32 to rotate the drive shaft 31, thereby driving the rotation shaft 1 to rotate.

[0047] In one embodiment, a rotating shaft 1 is rotatably connected to a housing, and its shaft body is machined with a cylindrical cam groove 101. A shift fork 4 is fitted onto the rotating shaft 1, and the shift fork 4 engages with the cam groove 101 on the rotating shaft 1 via a protrusion 41 mounted thereon. The fork head of the shift fork 4 is used to insert into the annular space of the sliding part 5, such as the annular space of the sliding sleeve 5 used for reversing in a reversing assembly. Thus, by rotating the rotating shaft 1, the rotational motion can be converted into the axial movement of the shift fork 4 and the sliding part, thereby realizing gear switching. The forward or reverse rotation of the rotating shaft 1 and the different rotation angles correspond to specific gears.

[0048] The specific design of the cylindrical cam groove 101 is as follows: The cylindrical cam groove 101 is composed of an S-shaped groove arranged spirally along the axis of rotation 1. Both ends of the S-shaped groove are connected to a locking groove section 1011. The locking groove section 1011 is a tangential groove extending circumferentially along the axis of rotation 1. The length direction of the locking groove section 1011 is perpendicular to the axial direction of the axis of rotation 1. When there is only the locking groove section 1011, when the protrusion 41 moves to the locking groove, it is in one position. Two locking groove sections 1011 realize two positions (e.g., Figure 14 (As shown).

[0049] Of course, this embodiment can also add a gap, making the cylindrical cam groove 101 longer on the rotating shaft 1, and setting a gap groove segment 1012 in the middle of the S-shaped groove of the cylindrical cam groove 101. The gap groove segment 1012 is parallel to the locking groove segment 1011. The existence of the gap groove segment 1012 makes the trajectory of the S-shaped cylindrical cam groove 101 formed by connecting two spiral grooves through the gap groove segment 1012 (e.g. Figure 13 As shown in the figure, this allows an S-shaped groove to achieve three gears, which can be first gear (forward), neutral, and second gear (reverse).

[0050] In one embodiment, when the reversing drive mechanism is used for switching between forward and reverse gears, to achieve the sensing of reverse gear engagement, an identification part 102 for marking the reverse gear position is provided at the end of the rotating shaft 1 away from the rolling wheel 23. A position sensor matching the identification part 102 is fixedly installed on the housing. The position sensor senses the identification part 102 when the protrusion 41 falls into the locking groove 1011 for reverse gear. The position sensor can be connected to the corresponding control system (e.g., in vehicle reversing, it is connected to the vehicle control system), thereby issuing an audible and visual alarm after the position sensor senses the identification part 102 to improve safety. In this embodiment, the identification part 102 is a gear slot 102 machined on the end face of the rotating shaft 1. Of course, the identification part 102 can also be a protrusion, reflector, magnet, color mark, or other design that can be sensed by the position sensor used in conjunction with it.

[0051] The above descriptions are merely embodiments of this utility model. Commonly known technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solution of this utility model. These modifications and improvements should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A lateral positioning assembly for a rotating shaft, characterized in that: It includes a limiting plate fixedly connected to the rotating shaft, with multiple limiting grooves on the outer periphery of the limiting plate, the limiting grooves being arranged circumferentially along the rotating shaft. It also includes an elastic positioning unit installed on a box or bracket fixed relative to the rotating shaft. The elastic positioning unit includes an elastic element and a rolling wheel pressed by the elastic element; wherein, the rolling wheel is pressed against the limiting groove under the preload of the elastic element.

2. The lateral positioning assembly for a rotating shaft according to claim 1, characterized in that: The limiting groove is a curved groove, and a protrusion is formed between adjacent limiting grooves.

3. The lateral positioning assembly for a rotating shaft according to claim 1, characterized in that: The elastic positioning unit also includes a pressure arm, which is rotatably connected to the housing or bracket. A rolling wheel is rotatably connected to the cantilever section of the pressure arm. The elastic element is a torsion spring sleeved at the rotation center of the pressure arm. One end of the torsion spring is fixed to the pressure arm, and the other end of the torsion spring is fixed to the housing or bracket.

4. A reversing drive mechanism, comprising a rotating shaft and a drive unit for rotating the rotating shaft, characterized in that: It also includes the lateral positioning component for the rotating shaft as described in any one of claims 1-3.

5. The commutation drive mechanism according to claim 4, characterized in that: Multiple connecting columns are fixed on the rotating shaft. The multiple connecting columns are distributed circumferentially about the rotating shaft and are parallel to the rotating shaft. The driving unit includes a driving shaft rotatably connected to the housing, a swing arm fixed to the driving shaft, and a driving hook rotatably connected to the end of the swing arm. The driving hook has a hook portion that can hook onto the connecting column, and the hook portion and the rolling wheel are arranged axially offset from each other on the rotating shaft. An elastic body is provided between the driving hook and the swing arm to force the driving hook to maintain the hooked state.

6. The commutation drive mechanism according to claim 5, characterized in that: The connecting post is inserted into the end face or the step face of the rotating shaft. The limiting plate is detachably connected to the rotating shaft, and the end face of the limiting plate facing the connecting post abuts against all the connecting posts.

7. The commutation drive mechanism according to claim 4, characterized in that: The drive unit includes a drive shaft and a drive wheel. The drive shaft is rotatably connected to the housing, the drive wheel is fixed on the drive shaft, and a driven wheel is fixed on the rotating shaft. The drive wheel and the driven wheel are connected by one of the following: chain drive, belt drive, and gear drive.

8. The commutation drive mechanism according to claim 4, characterized in that: A shift fork is fitted onto the rotating shaft, and a cylindrical cam groove is provided on the rotating shaft. The shift fork is provided with a protrusion that cooperates with the cam groove.

9. The commutation drive mechanism according to claim 8, characterized in that: The cylindrical cam groove is composed of an S-shaped groove arranged spirally along the axis of rotation. Both ends of the S-shaped groove are connected to a locking groove section. The locking groove section is a tangential groove extending circumferentially along the axis of rotation, and its length direction is perpendicular to the axis of rotation.

10. The commutation drive mechanism according to claim 4, characterized in that: The rotating shaft is provided with an identification part for identifying the gear position; it also includes a position sensor for matching the identification part, the position sensor being used to sense the corresponding identification part when the rotating shaft rotates to the corresponding gear position.

Images