A mechanical multi-turn encoder structure

Abstract

The utility model relates to an encoder and disclose a kind of anti-assembly mechanical multi-turn encoder structure, including the shell with top cover cover, the crossbeam being fixed in shell and being close to top cover, at least one multi-turn gear assembly, main shaft component, the PCBA board being connected with insert piece;Multi-turn gear assembly includes the secondary shaft being rotatably connected with crossbeam at top by secondary bearing, the secondary gear being fixed at the bottom end of secondary shaft, and crossbeam suspends secondary shaft in shell;Main shaft component includes the main shaft of bottom end protruding bottom plate, and main shaft is rotatably connected with crossbeam by upper bearing, and main shaft is rotatably connected with bottom plate by lower bearing, and main shaft is fixed with driving gear and single magnetic ring between upper bearing and lower bearing;Driving gear is engaged with secondary gear.The utility model rotates and supports main shaft by crossbeam, the position of main shaft relative to shell is moved up, and main gear is located between upper bearing and lower bearing;The installation direction of secondary main shaft is changed simultaneously, and the axial height of shell is shortened.

Description

Technical Field

[0001] This utility model relates to the field of encoder technology, and in particular to a reverse-mounted mechanical multi-turn encoder structure. Background Technology

[0002] Special encoder structural requirements necessitate a small overall axial dimension for the product, excluding the stop area, while the side electrical interfaces are large, almost filling the entire axial dimension of the encoder. Additionally, there are single-turn and multi-turn requirements, which conventional product layouts cannot meet. Existing solutions typically involve stacking multi-turn components and connectors along the product's axial height, resulting in a generally high axial dimension for conventional products and occupying significant space for the customer.

[0003] Conventional product design typically employs a bottom-up component layout, such as... Figure 1 The encoder shown, in its upright configuration, has the gear mounted on the top of the output shaft 91. The output shaft 91 is on the left side of the diagram. The main gear 92 is also mounted on the left side of the housing. The auxiliary gear 93 is also fixed to the auxiliary shaft from the left side of the housing, and is fixedly sleeved onto the auxiliary shaft. Several bearings supporting the rotation of the housing and supporting the output shaft 91 and auxiliary shaft are also arranged on the left side of the housing. To accommodate bearings of two different heights, the left side of the housing needs to be significantly thickened. The right side of the housing is mainly used to house other electrical components.

[0004] Therefore, there is an urgent need for a reverse-mounted mechanical multi-turn encoder structure to reduce the axial dimension of the housing. Utility Model Content

[0005] The purpose of this invention is to provide a structure for a reverse-mounted mechanical multi-turn encoder, which can be applied to sensor applications where height space is limited but lateral space is sufficient.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A reverse-mounted mechanical multi-turn encoder structure includes: a housing with a top cover, a crossbeam fixed inside the housing and close to the top cover, at least one multi-turn gear assembly, a spindle assembly, and a PCBA board with plug-in connectors. The PCBA board is fixed to the bottom plate inside the top cover or the housing; The multi-turn gear assembly includes a secondary shaft whose top end is rotatably connected to a crossbeam via a secondary bearing, and a secondary gear fixed at the bottom end of the secondary shaft. The crossbeam suspends the secondary shaft inside the housing. The spindle assembly includes a spindle extending from the bottom end of the base plate, a drive gear and a single-turn magnetic ring, an upper bearing and a lower bearing; The main shaft is rotatably connected to the crossbeam via an upper bearing, and the main shaft is rotatably connected to the base plate via a lower bearing. A drive gear and a single-turn magnetic ring are fixed between the upper bearing and the lower bearing on the main shaft. The driving gear meshes with the auxiliary gear.

[0007] Furthermore, the secondary bearing is sleeved between the crossbeam and the secondary shaft; The secondary shaft has a secondary shaft ring in the middle, and the bottom surface of the upper cover has a limiting protrusion. The axial sides of the secondary bearing are limited between the bottom surface of the limiting protrusion and the top surface of the secondary shaft ring.

[0008] Furthermore, it also includes a retaining ring fitted inside the limiting protrusion, and the secondary shaft has a retaining ring groove on the top surface of the secondary bearing, into which the retaining ring is embedded.

[0009] Furthermore, the base plate is provided with a thickened ring to accommodate the lower bearing, the main shaft extends out of the thickened ring, and the inner wall of the thickened ring is provided with a lower stepped surface at the lower position; The crossbeam has a stepped through hole to accommodate the upper bearing, and the crossbeam has an upper stop that blocks the top surface of the upper bearing. The drive gear, single-turn magnetic ring, upper bearing, and lower bearing are limited between the lower stepped surface and the upper stop.

[0010] Furthermore, a spindle collar is provided on the spindle body, and the lower bearing is limited between the lower stepped surface and the spindle collar; The drive gear, single-turn magnetic ring, and upper bearing are confined between the upper stop and the main shaft collar.

[0011] Furthermore, the crossbeam includes a strip-shaped main body and legs that are vertically fixed to both ends of the main body, and the legs are fixed to the shell.

[0012] Furthermore, the PCBA board is attached to the base plate.

[0013] Furthermore, the multi-turn gear assembly has two parts, with the driving gear located between the two auxiliary gears.

[0014] Compared with the prior art, the beneficial effects of this utility model are: This invention uses a crossbeam to rotate and support the main shaft, moving the main shaft's position relative to the housing upwards, with the main gear positioned between the upper and lower bearings. Simultaneously, it changes the installation direction of the secondary shaft, shortening the axial height of the housing. This structure, through a reverse-mounted mechanical multi-turn scheme, allows for the arrangement of single-turn and multi-turn products within a smaller space, making product design structures more diverse. It effectively solves the problem of high product dimensions caused by conventional sensor internal layouts. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of a multi-turn encoder in the prior art; Figure 2This is an exploded structural diagram of the reverse-mounted mechanical multi-turn encoder structure proposed in this utility model. Figure 3 This is a schematic diagram of the internal structure of the housing of the reverse-mounted mechanical multi-turn encoder structure proposed in this utility model. Figure 4 This is a schematic diagram of the ring gear assembly proposed in this utility model; Figure 5 This is a schematic diagram of the spindle assembly proposed in this utility model; Figure 6 This is a schematic diagram of the back structure of the reverse-mounted mechanical multi-turn encoder structure proposed in this utility model; Figure 7 This is a front view of the reverse-mounted mechanical multi-turn encoder structure proposed in this utility model. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0017] Reference Figure 2-7 A reverse-mounted mechanical multi-turn encoder structure includes a housing 1 with a top cover 10, a crossbeam 2 fixed inside the housing 1 and close to the top cover 10, at least one multi-turn gear assembly, a main shaft assembly, and a PCBA board 5 with a plug 7 fixedly connected to it. The plug 7 is located on the side wall of the housing 1. Because the plug 7 occupies a large longitudinal space, in the prior art, the main shaft and main / auxiliary gears are mostly concentrated on one side of the housing 1, and the height of the plug on the other side would result in an excessively large axial dimension of the encoder. This embodiment of the multi-turn encoder structure changes the layout of the main shaft, auxiliary shaft, and main / auxiliary gears.

[0018] The top cover 10 and the housing 1 form the outer shell of the encoder. The housing 1 is open at the top, and the top cover 10 can be detachably connected to the housing 1 by screws.

[0019] The PCBA board 5 is fixed and close to the top cover 10 or the bottom plate inside the housing 1. The bottom plate is opposite to the top cover 10. For example, this article describes the PCBA board 5 being fixed to the bottom plate of the housing 1.

[0020] The crossbeam 2 is located in the upper part of the housing 1. Its function is to provide a mounting base for the auxiliary gear and auxiliary shaft. The whole is flat.

[0021] The multi-turn gear assembly includes a secondary shaft 31, whose top end is rotatably connected to a crossbeam 2 via a secondary bearing 33, and a secondary gear 32 fixedly fitted onto the bottom end of the secondary shaft 31. The crossbeam 2 suspends the secondary shaft 31 within the housing 1. The bottom end of the secondary shaft 31 does not contact the PCBA board 5 or the housing 1. The crossbeam 2 utilizes the longitudinal space provided by the insert and the internal space of the housing. The multi-turn gear assembly on the crossbeam 2 has a compact structure, making it easy to assemble and remove from the housing. The crossbeam has a through hole for mounting the secondary bearing 33 at the corresponding position. The inner wall of the through hole can be fixedly connected to the outer ring of the secondary bearing 33 through an interference fit or adhesive bonding. The inner ring of the secondary bearing is fixed to the secondary shaft.

[0022] The spindle assembly includes a spindle 41 extending from the bottom plate, a drive gear 42, a single-turn magnetic ring 43, an upper bearing 44, and a lower bearing 45.

[0023] The main shaft 41 is rotatably connected to the crossbeam 2 via the upper bearing 44, and rotatably connected to the base plate via the lower bearing 45. A drive gear 42 and a single-turn magnetic ring 43 are fixed between the upper bearing 44 and the lower bearing 45. The vertical position of the drive gear 42 and the single-turn magnetic ring 43 is not critical; this paper describes a preferred embodiment where the single-turn magnetic ring 43 is close to the base plate and the drive gear is far from the base plate. The drive gear 42 and the single-turn magnetic ring 43 rotate synchronously with the main shaft 41. The main shaft 41 has only rotational freedom with the crossbeam 2 and the housing. The drive gear 42 meshes with the auxiliary gear 32. The main shaft 41 and the auxiliary shaft are arranged in parallel, and the axial direction of the main shaft 41 is perpendicular to the upper cover 10 and the crossbeam 2.

[0024] This embodiment utilizes a crossbeam located within the housing to mount the upper bearing and the secondary bearing, avoiding... Figure 1 In the prior art shown, the left side of the housing 1 is thickened to install the upper and lower bearings.

[0025] In a preferred embodiment, the secondary bearing 33 is fitted between the inner part of the crossbeam 2 and the outer part of the secondary shaft 31.

[0026] The secondary shaft 31 has a secondary shaft ring 311 in the middle, and the bottom surface of the upper cover 10 has a limiting protrusion 101 that extends into the through hole of the crossbeam. The axial sides of the secondary bearing 33 are limited between the bottom surface of the limiting protrusion 101 and the top surface of the secondary shaft ring 311. The limiting protrusion 101 acts as a stop, restricting the outer ring of the secondary bearing.

[0027] In a preferred embodiment, a retaining ring is further included inside the limiting protrusion 101. The secondary shaft 31 has a retaining ring groove 312 on the top surface of the secondary bearing 33, and the retaining ring is embedded in the retaining ring groove 312. The retaining ring is not shown in the figure, and its function is to limit the upward movement of the secondary bearing 33 relative to the upper cover 10.

[0028] In a preferred embodiment, a thickened ring 46 is provided on the base plate to accommodate the lower bearing 45. The main shaft 41 extends out of the thickened ring 46, and a lower stepped surface 461 is provided on the lower part of the inner wall of the thickened ring 46. The inner wall surface of the thickened ring 46 can be fixedly connected to the outer surface of the outer ring of the lower bearing 45. The thickened ring 46 increases the thickness of the base plate at the location where the lower bearing 45 is installed, and thickens in both the top and bottom directions of the base plate.

[0029] The crossbeam 2 has a stepped through hole to accommodate the upper bearing 44. The stepped through hole is narrower at the top and wider at the bottom, forming an upper stop 211 on the crossbeam 2 that blocks the top surface of the upper bearing 44. The drive gear 42, single-ring magnetic ring 43, upper bearing 44, and lower bearing 45 are confined between the lower stepped surface 461 and the upper stop 211. The stepped through hole is fixedly connected to the outer ring of the upper bearing 44, and the inner rings of the upper and lower bearings are fixed to the main shaft respectively.

[0030] More specifically, a spindle ring 411 is provided on the spindle body of the spindle 41, and the lower bearing 45 is limited between the lower step surface 461 and the spindle ring 411; The upper bearing 44, the drive gear 42, and the single-turn magnetic ring 43 are sequentially positioned between the upper stop 211 and the main shaft ring 411. The upper bearing 44 is positioned between the upper stop 211 and the drive gear 42. A limit ring is fixed to the side of the drive gear 42 facing the upper bearing, and the limit ring serves to limit the upper bearing 44.

[0031] In a preferred embodiment, the crossbeam 2 includes a strip-shaped main body and legs vertically fixed to both ends of the main body, the legs being fixed to the housing 1. A sub-shaft is mounted on the main body, and the bottom ends of the legs are L-shaped. Fixing blocks extending to the side walls of the housing 1 are fixed to the edge of the bottom plate. There are two fixing blocks located at both ends of the bottom plate. The bottom ends of the legs can be fitted onto the fixing blocks, facilitating the fixing of the legs to the housing 1 using screws. The side walls where the legs are mounted are adjacent to the side walls where the mounting inserts are installed.

[0032] In a preferred embodiment, the PCBA board 5 is attached to the base plate, and a fixing block is fixed on the edge of the base plate of the housing 1 and extends to the side wall of the housing 1. The fixing block is used to install the crossbeam 2 by fasteners. The shape of the PCBA board 5 should avoid the fixing block so that the fixing block is exposed.

[0033] The number of multi-turn gear assemblies is designed as needed. In a preferred embodiment, there are two multi-turn gear assemblies, with the driving gear 42 located between the two auxiliary gears 32.

[0034] The PCBA board features an embedded insert 7, occupying a significant amount of vertical space. Due to the insert's limitations, the PCBA board is positioned close to the lower end of the housing. The spindle assembly includes a single-turn magnetic ring and a drive gear, arranged from bottom to top. Two driven gears are positioned on either side of the drive gear on the spindle, with the driven gears designed to operate in a multi-turn configuration. The driven gears are suspended above the PCBA board 7, secured in an inverted manner by a crossbeam 2. Relative rotation between the driven gears and the crossbeam is achieved within the crossbeam via a secondary bearing.

[0035] In use, the main shaft is connected to the motor main shaft in the downward direction, so that the motor drives the encoder main shaft to rotate, and the driving gear transmits power to the driven gears on both sides, driving the auxiliary gear to rotate.

[0036] The solution achieves a horizontal layout where the multi-ring functional areas and inserts are positioned at the same level, further reducing the overall product height by expanding the lateral space. The design of the crossbeam assembly overcomes the difficulty of aligning the upper and lower housings, enabling an open, adjustable, concentric layout of the double-end bearings.

[0037] This document uses specific embodiments to illustrate the principles and implementation methods of this utility model. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principles of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A reverse-mounted mechanical multi-turn encoder structure, characterized in that, include: A housing (1) with a top cover (10) on top, a crossbeam (2) fixed inside the housing (1) and close to the top cover (10), at least one multi-turn gear assembly, a spindle assembly, and a PCBA board (5) connected with a plug (7). The PCBA board (5) is fixed to the bottom plate inside the top cover (10) or the housing (1); The multi-turn gear assembly includes a secondary shaft (31) rotatably connected to a crossbeam (2) at its top via a secondary bearing (33), and a secondary gear (32) fixed at the bottom of the secondary shaft (31). The crossbeam (2) suspends the secondary shaft (31) inside the housing (1). The spindle assembly includes a spindle (41) extending from the bottom end of the base plate, a drive gear (42), a single-turn magnetic ring (43), an upper bearing (44), and a lower bearing (45). The main shaft (41) is rotatably connected to the crossbeam (2) via the upper bearing (44), and the main shaft (41) is rotatably connected to the base plate via the lower bearing (45). The main shaft (41) has a drive gear (42) and a single-turn magnetic ring (43) fixed between the upper bearing (44) and the lower bearing (45). The driving gear (42) meshes with the auxiliary gear (32).

2. The reverse-mounted mechanical multi-turn encoder structure according to claim 1, characterized in that, The secondary bearing (33) is sleeved between the crossbeam (2) and the secondary shaft (31); The secondary shaft (31) has a secondary shaft ring (311) in the middle, and the bottom surface of the upper cover (10) has a limiting protrusion (101) protruding from it. The axial sides of the secondary bearing (33) are limited between the bottom surface of the limiting protrusion (101) and the top surface of the secondary shaft ring (311).

3. The reverse-mounted mechanical multi-turn encoder structure according to claim 2, characterized in that, It also includes a retaining ring fitted inside the limiting protrusion (101), and the secondary shaft (31) has a retaining ring groove (312) on the top surface of the secondary bearing (33), and the retaining ring is embedded in the retaining ring groove (312).

4. The reverse-mounted mechanical multi-turn encoder structure according to claim 1, characterized in that, The base plate is provided with a thickened ring (46) to accommodate the lower bearing (45), the main shaft (41) extends out of the thickened ring (46), and the inner wall of the thickened ring (46) is provided with a lower stepped surface (461) at the lower position. The crossbeam (2) has a stepped through hole for accommodating the upper bearing (44), and the crossbeam (2) has an upper stop (211) that blocks the top surface of the upper bearing (44). The drive gear (42), single-turn magnetic ring (43), upper bearing (44), and lower bearing (45) are limited between the lower stepped surface (461) and the upper stop (211).

5. The reverse-mounted mechanical multi-turn encoder structure according to claim 4, characterized in that, A spindle ring (411) is provided on the shaft body of the spindle (41), and the lower bearing (45) is limited between the lower step surface (461) and the spindle ring (411); The drive gear (42), single-turn magnetic ring (43), and upper bearing (44) are positioned between the upper stop (211) and the main shaft ring (411).

6. The reverse-mounted mechanical multi-turn encoder structure according to claim 1, characterized in that, The crossbeam (2) includes a strip-shaped main body and legs that are vertically fixed to both ends of the main body. The legs are fixed to the shell (1).

7. The reverse-mounted mechanical multi-turn encoder structure according to claim 1, characterized in that, The PCBA board (5) is attached to the base plate.

8. The reverse-mounted mechanical multi-turn encoder structure according to claim 1, characterized in that, The multi-turn gear assembly has two parts, with the driving gear (42) located between the two auxiliary gears (32).

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