A catch assembly and commutating drive mechanism for a rotating shaft

Abstract

The utility model relates to the technical field of gear shift mechanism, specifically disclose a kind of for rotary shaft's card stop subassembly and reversing drive mechanism, including the multiple limit posts of being fixed on rotary shaft, multiple limit posts are about rotary shaft circumferential distribution, form limiting recess between two adjacent limit posts, further include the elastic positioning unit of being installed on the box or support opposite fixed with rotary shaft, elastic positioning unit includes elastic member and by the rolling wheel of elastic member and press;Wherein, rolling wheel is under the pre-tightening force of elastic member, and it is tightly in the outer periphery of limit post, and can be clamped into limiting recess, to lock rotary shaft in preset rotating position. The present application is used to solve the problem of insufficient gear feeling clarity of the current card stop locking mechanism.

Description

Technical Field

[0001] This utility model relates to the field of gear shifting mechanism technology, specifically to a locking assembly and 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 locking assembly for a rotating shaft to solve the problem of insufficient clarity of the locking mechanism in the current locking mechanism.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A locking assembly for a rotating shaft includes multiple limiting posts fixed on the rotating shaft, the multiple limiting posts being distributed circumferentially about the rotating shaft, and a limiting recess being formed between two adjacent limiting posts. It 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. Under the preload of the elastic element, the rolling wheel is pressed against the outer periphery of the limiting posts and can be engaged in the limiting recess to lock the rotating shaft at a preset rotation position.

[0007] The principle and advantages of this solution are as follows: This solution achieves reliable locking with a simple structure and pure mechanical, passive drive by using a rolling wheel with elastic warning force applied by an elastic element to engage with the limiting recess formed by the circumferentially distributed limiting posts on the rotating shaft. This effectively reduces or even prevents accidental disengagement. The rolling of the rolling wheel also reduces operating force and wear through rolling friction, making gear shifting easier. In addition, because the rolling wheel is engaged with the adjacent limiting posts, a clear "click" sound is generated at the moment of locking to provide clear gear feedback.

[0008] Preferably, as an improvement, the limiting post is parallel to the rotation axis. Preferably, as an improvement, an annular groove coaxial with the rotating shaft is provided on the rotating shaft, and the limiting post is parallel to the rotating shaft and both ends of the limiting post are inserted into the side wall of the annular groove, so that the limiting recess is limited in the axial direction of the rotating shaft, and the rolling wheel is prevented from easily dislodging from the limiting recess.

[0009] Preferably, as an improvement, one end of the limiting post passes through the corresponding side arm of the annular groove, and a pressure plate is detachably connected to the rotating shaft. The pressure plate can simultaneously press all the limiting posts that pass through the side wall of the annular groove against the rotating shaft to simplify the installation of the limiting posts.

[0010] 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.

[0011] 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 aforementioned clamping assembly for the rotating shaft.

[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] Preferably, as an improvement, the drive unit includes a drive shaft rotatably connected to the housing, a swing arm fixed to the drive shaft, and a drive hook rotatably connected to the end of the swing arm; the drive hook has a hook portion capable of hooking onto a limiting post, and the hook portion and the rolling wheel are arranged axially offset from each other on the rotation axis; an elastic body is provided between the drive hook and the swing arm to force the drive hook to maintain the hooked state.

[0014] 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 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.

[0015] In addition, the use of a swing arm and a drive hook allows the limiting post to be used both for positioning and to cooperate with the drive hook to rotate the rotating shaft, resulting in a simple and practical structure.

[0016] Preferably, as an improvement, a pedal is fixed on the drive shaft to facilitate the operator to step on the pedal to rotate the drive shaft, thereby driving the rotation of the rotating shaft.

[0017] 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.

[0018] 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 gear locking through the mechanical structure itself. This effectively prevents gear disengagement due to vibration and provides the driver with a clear feel when engaging gears.

[0019] 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.

[0020] Beneficial effects: This design adds a neutral gear slot in the middle of the S-shaped groove, thus integrating a three-gear setting on a single cylindrical cam slot. These three gears can be forward, neutral, and reverse, providing three stable positions. The addition of the neutral position allows the driver to clearly cut off power. 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, limiting post 11, pressure plate 12, elastic positioning unit 2, pressure arm 21, elastic element 22, rolling wheel 23, drive unit 3, drive shaft 31, driving wheel 30, driven wheel 10, swing arm 311, drive 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, protrusion 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 locking assembly for a rotating shaft includes multiple limiting posts 11 fixed on the rotating shaft 1. The limiting posts 11 are parallel to the rotating shaft 1, and the multiple limiting posts 11 are evenly distributed around the rotating shaft 1. A limiting recess is formed between two adjacent limiting posts 11.

[0037] An annular groove coaxial with the rotating shaft 1 is machined on the rotating shaft 1. The limiting post 11 is parallel to the rotating shaft 1 and both ends of the limiting post 11 are inserted into the side wall of the annular groove. One end of the limiting post 11 passes through the corresponding side groove arm of the annular groove. A pressure plate 12 is screwed onto the rotating shaft 1. In this embodiment, the pressure plate 12 is a circular plate. The pressure plate 12 can simultaneously press all the limiting posts 11 that pass through the side wall of the annular groove against the rotating shaft 1. So that when installing the limiting post 11, it is only necessary to insert the limiting post 11 into the hole opened on the rotating shaft 1, and then use the pressure plate 12 to press the end of all the limiting posts 11 that protrudes from the rotating shaft 1 against the rotating shaft 1. This can achieve the quick installation of multiple limiting posts 11 on the rotating shaft 1.

[0038] 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.

[0039] 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 outer periphery of the limiting post 11 and can be engaged in the limiting recess.

[0040] 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 always press firmly against the limiting post 11. When the rotating shaft 1 rotates, the rolling wheel 23, under the continuous pressure of the torsion spring, rolls sequentially over the top of the limiting post 11 and finally engages with the corresponding limiting recess. At this point, the rotating shaft 1 is stably locked in the preset position, accompanied by a clear "click" sound.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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 limiting 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.

[0045] 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.

[0046] 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.

[0047] In one embodiment, a pedal 32 is fixed on the drive shaft 31 so that the operator can step on the pedal 32 to rotate the drive shaft 31, thereby driving the rotation shaft 1 to rotate.

[0048] 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, 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 5, thereby realizing gear switching. The forward or reverse rotation of the rotating shaft 1 and different rotation angles correspond to specific gears.

[0049] 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).

[0050] 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).

[0051] 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.

[0052] 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 locking assembly for a rotating shaft, characterized in that: It includes multiple limiting posts fixed on a rotating shaft, the multiple limiting posts being distributed circumferentially about the rotating shaft, and a limiting recess being formed between two adjacent limiting posts. 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. Under the preload of the elastic element, the rolling wheel is pressed against the outer periphery of the limiting post and can be engaged in the limiting recess.

2. The clamping assembly for a rotating shaft according to claim 1, characterized in that: An annular groove coaxial with the rotating shaft is provided on the rotating shaft, and the limiting post is parallel to the rotating shaft with both ends inserted into the side wall of the annular groove.

3. The clamping assembly for a rotating shaft according to claim 2, characterized in that: One end of the limiting post passes through the corresponding side arm of the annular groove, and a pressure plate is detachably connected to the rotating shaft. The pressure plate can simultaneously press all the limiting posts that pass through the side wall of the annular groove against the rotating shaft.

4. The clamping 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.

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

6. The commutation drive mechanism according to claim 5, characterized in that: The drive unit includes a drive shaft rotatably connected to the housing, a swing arm fixed to the drive shaft, and a drive hook rotatably connected to the end of the swing arm; the drive hook has a hook portion that can hook onto the limiting post, and the hook portion and the rolling wheel are arranged axially offset from each other on the rotation shaft; an elastic body is provided between the drive hook and the swing arm to force the drive hook to maintain the hooked state.

7. The commutation drive mechanism according to claim 5, 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 5, 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 9, characterized in that: The cylindrical cam groove is further provided with a neutral groove section in the middle. The neutral groove section is a tangential groove that extends 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.

Images