Speed change gear shifting mechanism

Abstract

The invention relates to a speed change gear shifting mechanism which comprises a transmission assembly and a gear shifting assembly. Wherein the transmission assembly comprises a rotatable input shaft and a rotatable output shaft; wherein the input shaft is fixedly sleeved with a plurality of input gears, the output shaft is sleeved with output gears in one-to-one correspondence with the input gears in a clearance mode, and the input gears are meshed with the corresponding output gears; the gear shifting assembly comprises a gear shifting selection piece and a gear locking piece, and the gear shifting selection piece linearly moves in the axial direction so as to drive the gear locking piece to lock the selected output gear in the radial direction. The speed changing and gear shifting mechanism is compact in structure.

Description

Technical Field

[0001] The present application relates to the field of mechanical transmission, and in particular to a speed change and shifting mechanism. Background Art

[0002] The Chinese utility model patent with the authorization announcement number CN206072312U discloses a reduction gearbox assembly, which includes a housing and an input gear shaft rotatably arranged on the housing, a low-speed gear, and an intermediate gear. The intermediate gear is meshed with the input gear shaft and the low-speed gear respectively, and the input gear shaft is provided with a sliding gear sleeve and a shift fork shift operating mechanism for controlling the separation of the sliding gear sleeve, and the shift fork shift operating mechanism includes a shift fork for controlling the sliding gear sleeve to slide left and right to achieve clutch.

[0003] The above prior art is applied to the speed change structure of the automobile, and the clutch of the transmission gear is realized by the shift fork, so that the transmission gear with different transmission ratios can be selected to achieve gear shifting. When the above structure is applied to multi-stage gear adjustment, the overall structure will occupy more space and it is difficult to be applied to small devices such as variable speed motors. Summary of the invention

[0004] In order to make the speed shifting structure more compact, the present application provides a speed shifting mechanism.

[0005] The present application provides a speed shifting mechanism, which adopts the following technical solution: A speed shifting mechanism comprises a transmission assembly and a shifting assembly; wherein The transmission assembly comprises a rotatable input shaft and an output shaft; wherein the input shaft is fixedly sleeved with a plurality of input gears, the output shaft is gap sleeved with output gears corresponding to the input gears one by one, and the input gears are meshed with the corresponding output gears; The shift assembly includes a shift selection member and a gear locking member. The shift selection member moves linearly in the axial direction within the output shaft to drive the gear locking member to radially lock the selected output gear.

[0006] The shift assembly is located inside the transmission assembly as a whole, and the speed shift structure is an overall double-axis design. The increase in the number of gears only increases the number of input gears and output gears, and does not increase the number of shafts. The overall structure is more compact and suitable for small equipment.

[0007] Optionally, the gear shift selection member is used to abut against a gear locking member, and the gear locking member is used to abut against an inner ring of an output gear.

[0008] Optionally, the gear locking piece is a spherical piece, and a tapered hole for accommodating the gear locking piece is circumferentially opened on the output shaft, and the outer diameter of the tapered hole is larger than the diameter of the gear locking piece, and the inner diameter is smaller than the diameter of the gear locking piece.

[0009] Optionally, the tapered holes opened in the circumferential direction form a hole group, and the hole groups are arranged in multiple groups along the axial direction, and the tapered holes in adjacent hole groups are arranged in a staggered manner.

[0010] Optionally, the inner ring of the output gear is provided with a tightening groove, and the gear locking member is used to tighten in the tightening groove. The inner ring of the output gear is also circumferentially provided with an annular groove connected with the tightening groove.

[0011] In the process of mechanical transmission, the input shaft is driven to rotate, and the input gears on the input shaft rotate together with the input shaft. The input gear drives the meshing output gear to rotate. However, when the gear is not selected, the output gear rotates but does not transmit torque.

[0012] When the gear shifting operation is performed, the gear shifting member moves linearly inside the output shaft. When the gear shifting member passes through the position of the tapered hole, the gear locking member originally contained in the tapered hole is pushed out radially, so that the outer surface of the gear locking member protrudes from the outer surface of the output shaft. The gear locking member then abuts against the abutting groove of the output gear, and the gear locking member completes the locking of the output gear corresponding to the tapered hole position, that is, the gear selection is completed. At this time, the locked output gear and the output shaft rotate together and transmit torque.

[0013] Optionally, the shift assembly further includes a shift transmission member, wherein the shift transmission member is fixedly connected to the shift selection member to drive the shift selection member to move linearly along the axial direction.

[0014] Optionally, a fixed gear assembly is further included, the fixed gear assembly includes a gear locking piece, the gear shift transmission piece is provided with a locking groove, and the gear locking piece is used to elastically press against the locking groove.

[0015] Optionally, the fixed stop assembly further includes an elastic ring, which is sleeved on the output shaft to provide radial elastic force for the gear locking member.

[0016] Optionally, the output shaft is provided with a receiving groove for receiving the elastic ring.

[0017] When the gear shifting operation is performed, the position of the gear locking member corresponds to the position of the locking groove on the gear shifting transmission member. Under the elastic force of the elastic ring, the head of the gear locking member is pressed against the locking groove to complete the fixed gear locking operation. In summary, the present application includes at least one of the following beneficial technical effects: The overall double-axis design has a compact structure and is suitable for use in small equipment; To meet the requirements of different gear numbers, only the structure needs to be simply adapted; It has a gear locking function to reduce the possibility of gear shifting due to external vibrations during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of a speed shifting structure in an embodiment of the present application.

[0019] Figure 2 Schematic diagram of the structure of the output gear in the embodiment of the present application.

[0020] Figure 3 It is a schematic diagram of the structure of the output shaft in an embodiment of the present application.

[0021] Figure 4 It is a partial cross-sectional view of the output shaft in the embodiment of the present application.

[0022] Figure 5 It is a schematic diagram of the structure of the shift assembly in the embodiment of the present application.

[0023] Figure 6 yes Figure 2 The enlarged structural diagram of part A is used to show the structure of the fixed stop assembly in the embodiment of the present application.

[0024] Explanation of the reference numerals: 100, transmission assembly; 110, input shaft; 120, output shaft; 121, tapered hole; 122, accommodating groove; 130, input gear; 131, first input gear; 132, second input gear; 133, third input gear; 134, fourth input gear; 135, fifth input gear; 140, output gear; 1401, abutment groove; 1402, ring groove; 141, first output gear; 142, second output gear; 143, third output gear; 144, fourth output gear; 145, fifth output gear; 200, shift assembly; 210, gear locking member; 220, shift transmission member; 221, locking groove; 230, shift selection member; 300, fixed gear assembly; 310, gear locking member; 320, elastic ring. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0026] In addition, the term "axial" in this application refers to the direction of the central axis of rotation of the cylinder for cylindrical objects, that is, the same direction as the central axis; "radial" is perpendicular to the "axial", that is, the radius or diameter direction of the end circle of the cylinder; "circumferential" refers to the "circumferential direction", that is, the direction around the axis of the cylinder, which together with the "axial" and "radial" constitute the three orthogonal directions of the cylindrical coordinates.

[0027] The following is combined with Figure 1-6 , further details of this application are given.

[0028] The embodiment of the present application discloses a speed shifting mechanism.

[0029] A speed shifting mechanism includes a transmission assembly 100 , a shift assembly 200 and a fixed gear assembly 300 .

[0030] Reference Figure 1 , the transmission assembly 100 includes an input shaft 110, an output shaft 120, an input gear 130 and an output gear 140. A speed change and shifting mechanism of the present application can realize multi-gear speed change adjustment, that is, the transmission ratio of different gear sets can be selected. In this embodiment, five-gear speed change adjustment is taken as an example, and five input gears 130 are provided, which have different diameters; five output gears 140 are correspondingly provided, which are respectively meshed with the corresponding input gears 130. Specifically, in this embodiment, the five input gears 130 are respectively the first input gear 131, the second input gear 132, the third input gear 133, the fourth input gear 134 and the fifth input gear 135; the five output gears 140 are respectively the first output gear 141, the second output gear 142, the third output gear 143, the fourth output gear 144 and the fifth output gear 145. The first input gear 131 is meshed and connected with the first output gear 141, the second input gear 132 is meshed and connected with the second output gear 142, and so on.

[0031] For designs with different numbers of gears, only the number of input gears 130 and output gears 140 needs to be changed; if four-gear adjustment is required, four pairs of input gears 130 and output gears 140 are required.

[0032] The input gear 130 is fixedly sleeved on the input shaft 110. Specifically, the input gear 130 can be integrally formed with the input shaft 110 or connected to the input shaft 110 via a spline. The output gear 140 is sleeved on the output shaft 120 with a gap, that is, there is a gap between the inner ring of the output gear 140 and the outer ring of the output shaft 120.

[0033] A boss may be provided on one end surface of the output gear 140 for abutting against an adjacent output gear 140 to reduce wear of the output gear 140 .

[0034] Reference Figure 2The inner ring of the output gear 140 is provided with a tightening groove 1401 and an annular groove 1402. The tightening groove 1401 penetrates the two end faces of the output gear 140 in a direction parallel to the output shaft 120, and the annular groove 1402 is arranged along the circumference of the inner ring of the output gear 140, and the central axis of the annular groove 1402 is parallel to the end face of the output gear 140.

[0035] Reference Figure 3-Figure 5 The shift assembly 200 includes a gear locking member 210, a shift transmission member 220, and a shift selection member 230. In this embodiment, the gear locking member 210 is a spherical member, and a spherical steel ball can be used. The abutting groove 1401 and the annular groove 1402 are both curved grooves that match the diameter of the gear locking member 210. The abutting groove 1401 runs through the two end surfaces of the output gear 140 to facilitate the installation of the output gear 140.

[0036] Reference Figure 3 and Figure 4 The output shaft 120 is a hollow shaft, and a plurality of hole groups are formed on its circumferential side surface, and the number of hole groups is the same as the number of output gears 140. The position of the hole group corresponds to the position of the inner ring of the corresponding output gear 140. The hole group includes tapered holes 121 arranged at intervals around the axis of the output shaft 120, and the tapered holes 121 penetrate the side wall of the output shaft 120. The outer diameter of the tapered hole 121, that is, the diameter of the tapered hole 121 on the outer surface of the output shaft 120, is greater than the diameter of the gear locking member 210, and the inner diameter of the tapered hole 121, that is, the diameter of the tapered hole 121 on the inner surface of the output shaft 120, is smaller than the diameter of the gear locking member 210. When the gear is not selected, the outer surface of the gear locking member 210 protrudes from the inner surface of the output shaft 120.

[0037] Preferably, the tapered holes 121 in adjacent hole groups can be arranged spirally along the surface of the output shaft 120, that is, a structure in which the tapered holes 121 in adjacent hole groups are arranged alternately is formed. Under the condition of meeting the strength requirement, the thickness of the output gear 140 can be designed to be smaller, making the overall structure more compact.

[0038] Reference Figure 5 In this embodiment, the shift transmission member 220 is generally a solid cylindrical member, and the shift selection member 230 is a flange arranged in the middle of the shift transmission member 220 . The shift transmission member 220 and the shift selection member 230 are integrally formed.

[0039] The shift transmission member 220 is provided with locking grooves 221 in the circumferential direction, the number of the locking grooves 221 is the same as the number of the output gears 140, the center lines of the multiple locking grooves 221 are perpendicular to the axis of the output shaft 120, and the distance between axially adjacent locking grooves 221 is the same as the distance between axially adjacent output gears 140. The locking grooves 221 are preferably trapezoidal grooves.

[0040] Reference Figure 5 and Figure 6, the fixed stop assembly 300 includes a shift lock 310 and an elastic ring 320. In this embodiment, the shift lock 310 is a pin arranged perpendicular to the output shaft 120, with its tail located outside the output shaft 120 and its head extending into the inside of the output shaft 120; the elastic ring 320 is an elastic annular member, which can be an elastic rubber ring or a spring ring formed by connecting the ends of two springs. The elastic ring 320 is sleeved on the outside of the output shaft 120, and the elastic ring 320 elastically presses against the tail of the shift lock 310. The output shaft 120 is also circumferentially provided with a receiving groove 122 for accommodating the elastic ring 320 and the shift lock 310.

[0041] During the mechanical transmission process, the input shaft 110 is driven to rotate, and the input gear 130 on the input shaft 110 rotates together with the input shaft 110. The input gear 130 drives the meshing output gear 140 to rotate. However, when the gear position is not selected, the output gear 140 rotates but does not transmit torque.

[0042] When the gear shifting operation is performed, the gear shift transmission member 220 is driven by a driving source to move linearly along the axis inside the output shaft 120. The driving source can be a manual driving source, or an electric or pneumatic driving source. Driven by the gear shift transmission member 220, the gear shift selection member 230 moves linearly inside the output shaft 120. When the gear shift selection member 230 passes the position of the tapered hole 121, the gear locking member 210 originally accommodated in the tapered hole 121 is pushed out radially, so that the outer surface of the gear locking member 210 protrudes from the outer surface of the output shaft. The gear locking member 210 then presses against the pressing groove 1401 of the output gear 140, and the gear locking member 210 completes the locking of the output gear 140 corresponding to the tapered hole 121, that is, the gear selection is completed. At this time, the locked output gear 140 and the output shaft 120 rotate together and transmit torque.

[0043] At this time, the position of the gear locking member 310 corresponds to the position of the locking groove 221 on the gear shift transmission member 220. Under the elastic force of the elastic ring 320, the head of the gear locking member 310 is pressed against the locking groove 221 to complete the fixed gear locking operation.

[0044] The shift selector 230 continues to move, and the gear lock 310 is disengaged from the lock groove 221, releasing the fixed gear. Since the outer diameter of the shift selector 230 is smaller than the outer diameter of the shift transmission member 220, the shift transmission member 220 does not provide radial clamping force to the gear lock 210. At this time, the output gear 140 still rotates with the input gear 130, but no longer transmits torque. During the rotation of the output gear 140, the gear lock 210 that was originally pushed out moves relatively in the annular groove 1402, and does not hinder the rotation of the output gear 140.

[0045] The shift selector 230 continues to move axially through the position of the next set of tapered holes 121, and the position of the gear locking member 210 may not correspond to the abutment groove 1401 of the output gear 140, thereby generating resistance to the shift selector 230. However, since the input gear 130 drives the output gear 140 to rotate continuously, after rotating a certain angle, the position of the gear locking member 210 corresponds to the abutment groove 1401 of the output gear 140, and the shift selector 230 can then shift gears.

[0046] The speed change and shifting structure in the present application is simple to implement, compact in structure, easy to expand the gears, and has a fixed gear locking structure, which is suitable for a bumpy and vibrating working environment. The speed change and shifting mechanism can be applied to a small variable speed motor.

[0047] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A speed shifting mechanism, characterized in that: It includes a transmission assembly and a shift assembly; wherein The transmission assembly comprises a rotatable input shaft and an output shaft; wherein a plurality of input gears are fixedly sleeved on the input shaft, and output gears corresponding to the input gears are gap sleeved on the output shaft, and the input gears are meshed with the corresponding output gears; The shift assembly includes a shift selection member and a gear locking member. The shift selection member moves linearly in the axial direction within the output shaft to drive the gear locking member to radially lock the selected output gear.

2. A speed shifting mechanism according to claim 1, characterized in that: The shift selection member is used to abut against the gear locking member, and the gear locking member is used to abut against the inner ring of the output gear.

3. A speed shifting mechanism according to claim 2, characterized in that: The gear locking piece is a spherical piece, and a tapered hole for accommodating the gear locking piece is circumferentially opened on the output shaft. The outer diameter of the tapered hole is larger than the diameter of the gear locking piece, and the inner diameter is smaller than the diameter of the gear locking piece.

4. A speed shifting mechanism according to claim 3, characterized in that: The tapered holes opened in the circumferential direction form a hole group, and the hole groups are arranged in multiple groups along the axial direction, and the tapered holes in adjacent hole groups are arranged in a staggered manner.

5. A speed shifting mechanism according to claim 3, characterized in that: The inner ring of the output gear is provided with a tightening groove, and the gear locking member is used to tighten in the tightening groove. The inner ring of the output gear is also circumferentially provided with an annular groove connected with the tightening groove.

6. A speed shifting mechanism according to claim 1, characterized in that: The shift assembly further comprises a shift transmission member, wherein the shift transmission member is fixedly connected to the shift selection member to drive the shift selection member to move linearly along the axial direction.

7. A speed shifting mechanism according to claim 6, characterized in that: It also includes a fixed gear assembly, which includes a gear locking piece. The gear shift transmission piece is provided with a locking groove, and the gear locking piece is used to elastically press against the locking groove.

8. A speed shifting mechanism according to claim 7, characterized in that: The fixed stop assembly further comprises an elastic ring, which is sleeved on the output shaft and provides radial elastic force for the gear locking member.

9. A speed shifting mechanism according to claim 8, characterized in that: The output shaft is provided with a receiving groove for receiving the elastic ring.

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