Pin tooth shell, speed reducer, cutter and measuring tool

Abstract

The utility model discloses a kind of needle tooth shell, speed reducer, cutter and measuring tool, it is related to speed reducer technical field.Needle tooth shell includes matrix and multiple grooves, by setting inner hole in matrix and setting multiple tooth slots around the circumferential wall of inner hole, the inner wall of multiple tooth slots is correspondingly provided with groove.As the contact angle of needle tooth and tooth slot is usually not in the bottom of tooth slot, by setting groove in the region of 0 to 20 degrees on the symmetry line of tooth slot profile line side, and in the region of 0 to 20 degrees on the other side, the stress point of needle tooth and needle tooth shell can be effectively avoided to appear on groove, and needle tooth is convenient to pass through tooth slot Force transmission to needle tooth shell.As the existence of groove, it can effectively avoid the wear and tear between protrusion and needle tooth caused by manufacturing error and cutter wear and tear, reduce the generation of abrasive particles, and then reduce the occurrence of needle tooth shell wear aggravation, to improve the reliability and service life of needle tooth shell, and improve the manufacturability of needle tooth shell.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of speed reducer, especially to a pin gear shell, a speed reducer, a cutter and a measuring tool. BACKGROUND

[0002] The pin gear shell of RV speed reducer and cycloid speed reducer has a tooth groove, which can be machined by gear turning process during manufacturing. Since gear turning process belongs to cutting machining, the manufacturing precision of the cutter will affect the machining precision, so the cutter has high requirements. The front surface of the cutter is used for machining the tooth bottom of the tooth groove, and the two sides are used for machining the side surface of the tooth groove. Since the cutting depth of the front surface of the cutter is greater than that of the two sides, the front surface of the cutter is more prone to wear. After multiple machining, the wear of the front surface of the cutter will easily cause the bottom of the tooth groove to form a protrusion, and the tooth shape error increases. After the pin gear shell is assembled, the pin gears are arranged in the tooth grooves. Due to the existence of the protrusion, the wear between the protrusion and the pin gears will be intensified, and the service life of the pin gear shell will be shortened. SUMMARY

[0003] The utility model discloses at least one of the technical problems existing in the prior art. To this end, the utility model provides a pin gear shell, which can improve the service life of the pin gear shell.

[0004] The utility model discloses still provide a speed reducer with above-mentioned pin gear shell, cutter for manufacturing pin gear shell and measuring tool for measuring pin gear shell size.

[0005] According to the pin gear shell of the utility model first aspect embodiment, including: base body is equipped with the inner hole and the plurality of tooth grooves of the week wall setting around the inner hole, a plurality of recesses are correspondingly arranged on the inner wall of the plurality of tooth grooves, wherein, on the projection plane perpendicular to the central axis of the inner hole, the profile line of the tooth groove is a circular arc line and the center of the circle is O point, the profile line of the recess and the profile line of the tooth groove have two intersection points, one of the intersection points and the connecting line of the O point and the symmetric center line of the profile line of the tooth groove meet the angle α, and satisfy: 0 ° < α ≤ 20 °, the other intersection point and the connecting line of the O point and the symmetric center line of the profile line of the tooth groove meet the angle β, and satisfy: 0 ° < β ≤ 20 °.

[0006] According to the pin gear shell of the utility model embodiment, at least has following beneficial effect:

[0007] By setting the inner hole in the base body and the plurality of gear slots around the circumferential wall of the inner hole, the inner wall of the plurality of gear slots is correspondingly provided with the groove. Since the contact angle of the needle tooth and the gear slot is generally not at the bottom of the gear slot, by setting the groove in the area of 0° to 20° on one side of the symmetry line of the gear slot profile line and in the area of 0° to 20° on the other side, the stress points of the needle tooth and the needle tooth shell can be effectively avoided from appearing on the groove, so that the needle tooth can conveniently transmit the force to the needle tooth shell through the gear slot. Due to the existence of the groove, the wear between the protrusion and the needle tooth caused by the manufacturing error and the tool wear can be effectively avoided, the generation of abrasive particles is reduced, and the situation of the aggravation of the wear of the needle tooth shell is reduced, so as to improve the reliability and service life of the needle tooth shell and improve the manufacturability of the needle tooth shell.

[0008] According to some embodiments of the utility model, along the radial direction of the needle tooth shell, the maximum depth of the groove is H1, and 0.005mm≤H1≤0.05mm is met.

[0009] According to some embodiments of the utility model, the groove is provided with a protrusion, and on a projection plane perpendicular to the central axis of the inner hole, the profile line of the protrusion is located on one side of the fitting circle of the gear slot away from the center of the needle tooth shell.

[0010] According to some embodiments of the utility model, a plurality of protrusions are arranged in the groove.

[0011] The speed reducer according to the second aspect of the utility model comprises the needle tooth shell according to the above embodiments.

[0012] The speed reducer according to the utility model has at least the following beneficial effects:

[0013] By adopting the needle tooth shell according to the first aspect of the utility model, the needle tooth shell is provided with the plurality of gear slots around the circumferential wall of the inner hole, and the inner wall of the plurality of gear slots is correspondingly provided with the groove. Since the contact angle of the needle tooth and the gear slot is generally not at the bottom of the gear slot, by setting the groove in the area of 0° to 20° on one side of the symmetry line of the gear slot profile line and in the area of 0° to 20° on the other side, the stress points of the needle tooth and the needle tooth shell can be effectively avoided from appearing on the groove, so that the needle tooth can conveniently transmit the force to the needle tooth shell through the gear slot. Due to the existence of the groove, the wear between the protrusion and the needle tooth caused by the manufacturing error and the tool wear can be effectively avoided, the generation of abrasive particles is reduced, and the situation of the aggravation of the wear of the needle tooth shell is reduced, so as to improve the reliability and service life of the needle tooth shell and improve the manufacturability of the needle tooth shell.

[0014] The speed reducer according to the third aspect of the present application comprises a pin gear shell, a plurality of gear grooves are arranged around the inner hole of the pin gear shell, and a plurality of pin gears are arranged in the plurality of gear grooves respectively; a planet carrier is arranged in the pin gear shell and can rotate relative to the pin gear shell; a plurality of crank shafts are rotatably supported on the planet carrier, and the crank shafts comprise eccentric parts; a cycloid gear is connected with the eccentric parts of the plurality of crank shafts and can rotate in the pin gear shell; and a bearing is arranged to rotatably connect the planet carrier and the pin gear shell, wherein the inner wall of the gear groove comprises a stress area configured to abut against the pin gear, and the inner wall of the gear groove is provided with a groove located outside the stress area.

[0015] The cutter according to the fourth aspect of the present application is used for machining the pin gear shell according to the first aspect of the present application, and comprises a mounting portion, an annular portion and a plurality of cutting edges, the annular portion is connected to the mounting portion, the plurality of cutting edges are arranged along the circumference of the annular portion and connected to the outer circumferential wall of the annular portion, the cutting edges are used for machining the gear grooves, the tip of at least one of the cutting edges is provided with a protruding portion, and the protruding portion is used for machining the groove.

[0016] The cutter according to the present application has at least the following beneficial effects:

[0017] By arranging the protruding portion at the tip of the cutting edge, the cutter can machine the groove while machining the gear groove, thereby saving the process, without the need to additionally arrange other processes to machine the groove, so that the production efficiency can be improved and the production cost can be reduced, and the machining precision requirement of the groove is lower than the arc contour precision requirement of the gear groove, so that the machining difficulty of the gear groove and the manufacturing difficulty of the cutter are effectively reduced. When the number of the cutting edges and the number of the gear grooves are prime numbers, only one cutting edge needs to be provided with the protruding portion, and the protruding portion can successfully machine the groove in all the gear grooves during the continuous rotation of the cutter.

[0018] According to some embodiments of the present application, the maximum height of the protruding portion protruding from the cutting edge is H2, and 0.005mm≤H2≤0.05mm is satisfied.

[0019] According to some embodiments of the present application, the tips of all the cutting edges are respectively provided with the protruding portions.

[0020] According to the fifth aspect of the utility model, the tool is used for measuring the distance between the centers of the two tooth grooves of the pin tooth shell which are symmetric to the center, the measuring tool comprises a connecting rod, a fixed part, a movable part, an elastic member and an indicating table, one end of the connecting rod is fixedly connected with the fixed part, the fixed part comprises a first measuring head, one end of the first measuring head away from the connecting rod is provided with a first side surface, and the first measuring head is respectively provided with a first abutting part at both ends of the first side surface; the other end of the connecting rod is provided with a slot, the elastic member is arranged in the slot, the movable part is inserted into the slot and abuts against the elastic member, the indicating table is mounted on the connecting rod and connected with the movable part, the movable part comprises a second measuring head, one end of the second measuring head away from the connecting rod is provided with a second side surface, and the second measuring head is respectively provided with a second abutting part at both ends of the second side surface; wherein, when the measuring tool is inserted into the inner hole, the first side surface and the corresponding recess in the tooth groove are arranged at intervals, and the first abutting part abuts against the inner wall of the corresponding tooth groove; the second side surface and the corresponding recess in the tooth groove are arranged at intervals, and the second abutting part abuts against the inner wall of the corresponding tooth groove.

[0021] According to the utility model embodiment, the measuring tool has at least the following beneficial effects:

[0022] When the distance between the centers of the two tooth grooves needs to be measured, the first measuring head is inserted into one of the tooth grooves, and the second measuring head is inserted into the other tooth groove. Since the movable part and the elastic member abut against each other, the movable part can drive the second measuring head to move along the length direction of the connecting rod, so that the second abutting part of the second measuring head can stably abut against the inner wall of the tooth groove. Since the first side surface and the second side surface are arranged at intervals with the corresponding recess, when the measuring tool measures the distance between the centers of the two tooth grooves, the measuring tool is not affected by the recess and the protrusion, and the measuring precision can be improved.

[0023] According to some embodiments of the utility model, the first abutting part is configured as a rounded corner; and / or the second abutting part is configured as a rounded corner.

[0024] According to some embodiments of the utility model, the first side surface is a plane; and / or the second side surface is a plane.

[0025] Additional aspects and advantages of the utility model will be partially given in the following description, partially will become obvious from the following description, or will be understood by the practice of the utility model. BRIEF DESCRIPTION OF DRAWINGS

[0026] The utility model will be further described below in combination with the drawings and embodiments, wherein:

[0027] Figure 1is a structure schematic view of a pin tooth shell of an embodiment of the utility model;

[0028] Figure 2 is Figure 1 the enlarged view of A in the middle;

[0029] Figure 3 is a structure schematic view of the concave groove forms the convex of another embodiment of the utility model;

[0030] Figure 4 is a structure schematic view of the cycloid wheel and the pin tooth shell cooperation of an embodiment of the utility model;

[0031] Figure 5 is the curve graph of the contact angle size of the pin tooth in different tooth grooves of an embodiment of the utility model;

[0032] Figure 6 is a structure schematic view of the cutter of an embodiment of the utility model;

[0033] Figure 7 is another perspective structure schematic view of the cutter of an embodiment of the utility model;

[0034] Figure 8 is the simplified schematic view of the cutter blade in the tooth groove of an embodiment of the utility model;

[0035] Figure 9 is a structure schematic view of the measuring tool in the pin tooth shell of an embodiment of the utility model;

[0036] Figure 10 is Figure 9 the enlarged view of B in the middle;

[0037] Figure 11 is Figure 9 the enlarged view of C in the middle.

[0038] Reference signs:

[0039] Pin tooth shell 100;Base body 110;Inner hole 111;Tooth groove 112;Concave groove 120;Convex 121;Pin tooth 130;

[0040] Cutter 200;Mounting portion 210;Annular portion 220;Cutter blade 230;Convex portion 231;

[0041] Measuring tool 300;Connecting rod 310;Fixed portion 320;First measuring head 321;First side surface 322;First abutting portion 323;Movable portion 330;Second measuring head 331;Second side surface 332;Second abutting portion 333;Elastic member 340;Indication table 350;

[0042] Cycloid wheel 400. DETAILED DESCRIPTION

[0043] The embodiments of the present application are described below in detail, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary, only for explaining the present application, and cannot be understood as a limitation of the present application.

[0044] In the description of the present application, it is understood that the orientation description, such as the orientation or position relationship indicated by up, down, front, back, left, right, etc. is based on the orientation or position relationship shown in the drawings, only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as a limitation of the present application.

[0045] In the description of the present application, the meaning of several is one or more, the meaning of multiple is more than two, greater than, less than, more than, etc. are understood as not including the number, above, below, etc. are understood as including the number. If it is described as first, second, only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the sequence of indicated technical features.

[0046] In the description of the present application, unless otherwise explicitly limited, the words such as setting, installing, connecting, etc. should be broadly understood, and the person skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical scheme.

[0047] The pin gear housing of the RV reducer and the cycloid reducer has a tooth groove in the shape of a circular arc. The conventional processing method of the tooth groove is through grinding processing. However, grinding processing needs to grind each tooth separately, which is low in efficiency and high in cost of the grinding wheel. In order to improve the efficiency and reduce the cost, the tooth groove can be processed by turning. Since turning adopts a cutting processing method, the design and wear of the tool greatly affect the accuracy of the tooth shape. The front surface of the tool is used to process the tooth bottom of the tooth groove, and the two sides are used to process the side surface of the tooth groove. Since the cutting depth of the front surface of the tool is greater than that of the two sides, the front surface of the tool is more prone to wear. After multiple processing, due to the wear of the front surface of the tool, the bottom of the tooth groove is prone to form a protrusion, and the tooth shape error increases. After the pin gear housing is assembled, the pin gear is arranged in the tooth groove. Due to the existence of the protrusion, the wear between the protrusion and the pin gear is intensified, and the service life of the pin gear housing is shortened. Therefore, the tool needs to be replaced frequently, which also increases the cost.

[0048] In order to reduce the wear of the pin gear housing, with reference to Figure 1 and Figure 2As shown, the pin gear shell 100 of the embodiment of the utility model can be used for RV speed reducer or cycloid speed reducer. The pin gear shell 100 of the embodiment of the utility model comprises a base body 110 and a plurality of grooves 120, the base body 110 is provided with an inner hole 111, the inner hole 111 is provided with a plurality of gear slots 112, the plurality of gear slots 112 are arranged at intervals around the peripheral wall of the inner hole 111, for example, are uniformly arranged at intervals. The inner wall of all the gear slots 112 is provided with the groove 120.

[0049] Referring to Figure 2 As shown, on the projection plane perpendicular to the central axis of the inner hole 111, the profile line of the gear slot 112 is a circular arc line and the center of the circle is the O point, the profile line of the groove 120 and the profile line of the gear slot 112 have two intersection points, the first intersection point is the A point, the second intersection point is the B point, the included angle between the line connecting the A point and the O point and the symmetrical center line of the profile line of the gear slot 112 is α, and 0° < α ≤ 20° is satisfied, for example, the value of α can be 5°, 7°, 10°, 15°, 18°, 20° and the like. The included angle between the line connecting the B point and the O point and the symmetrical center line of the profile line of the gear slot 112 is β, and 0° < β ≤ 20° is satisfied, for example, the value of β can be 5°, 7°, 10°, 15°, 18°, 20° and the like. It can be understood that when α is greater than 20°, the meshing of the pin gear 130 and the gear slot 112 is easily affected, which can cause the operation stability of the speed reducer to be poor and the vibration to be intensified. When β is greater than 20°, the meshing of the pin gear 130 and the gear slot 112 is also easily affected, which can cause the operation stability of the speed reducer to be poor and the vibration to be intensified.

[0050] By adopting the above solution, since the contact angle between the pin tooth 130 and the tooth groove 112 is usually not at the bottom of the tooth groove 112, by setting the groove 120 in the 0° to 20° area on one side of the symmetrical line of the tooth groove 112 contour and in the 0° to 20° area on the other side, that is, the groove 120 is not in the stress area of ​​the tooth groove 112 and the pin tooth 130, the stress point of the pin tooth 130 and the pin tooth housing 100 can be reduced to appear on the groove 120. This facilitates the pin tooth 130 to transmit force to the pin tooth housing 100 through the tooth groove 112, ensuring the stability and reliability of the reducer operation. Due to the presence of the groove 120, wear between the protrusion 121 and the pin tooth 130 caused by manufacturing errors and tool wear 200 can be effectively avoided, reducing the generation of abrasive particles, thereby reducing the occurrence of accelerated wear of the pin tooth housing 100, improving the reliability and service life of the pin tooth housing 100, and enhancing the manufacturability of the pin tooth housing 100. Meanwhile, the groove 120 can also store abrasive grains, reducing wear between the needle teeth 130 and the tooth groove 112, and further improving the service life of the needle tooth housing 100. When the tool 200 gradually wears down, one manifestation is that the depth of the groove 120 becomes shallower. At this time, it will not increase the wear of the needle teeth 130, so the tool 200 can continue to be used, thereby effectively extending the service life of the tool 200 and reducing the cost of replacing the tool 200.

[0051] To confirm the contact angle between the needle tooth 130 and the tooth groove 112, refer to Figure 4 As shown, the cycloidal wheel 400 is disposed within the inner hole 111 of the pin tooth housing 100. The center of the cycloidal wheel 400 is offset to a certain extent relative to the center of the inner hole 111, with the maximum offset equivalent to the eccentricity of the crankshaft, and the eccentricity is L. There is a resultant force point C between the pin tooth housing 100 and the cycloidal wheel 400. The distance between the resultant force point C and the center of the inner hole 111 is equal to the number of teeth multiplied by the eccentricity L, and the resultant force point lies on the extension of the line connecting the center point D of the inner hole 111 to the center point C of the cycloidal wheel 400. A normal line to the outer tooth profile of the cycloidal wheel 400 is drawn from the resultant force point C and extended to the tooth groove 112 of the pin tooth housing 100. The line connecting the center point D of the inner hole 111 to the center of the tooth groove 112 represents the 0° position of the tooth groove 112. The angle between the line connecting the point of application of the resultant force C and the normal to the outer tooth profile of the cycloidal wheel 400, and the line connecting the center point D of the inner hole 111 and the center of the tooth groove 112, is the contact angle θ. Finally, we can obtain... Figure 5 All needle teeth have a contact angle of 130°. Figure 5 In the diagram, the horizontal axis represents the tooth groove number (e.g., 112), and the vertical axis represents the contact angle. From... Figure 5 As can be seen, the minimum contact angle is greater than 15°. Therefore, the proportion of the groove 120 in each tooth groove 112 in the circumferential direction of the needle tooth shell 100 can be inconsistent, or the proportion of the groove 120 in the circumferential direction of the needle tooth shell 100 can be uniformly set according to the minimum contact angle.

[0052] Referring to Figure 2 As shown in the drawings, in the embodiment of the utility model, along the radial direction of the needle tooth shell 100, the maximum depth of the groove 120 is H1, which satisfies: 0.005mm≤H1≤0.05mm, for example, the value of H1 can be 0.005mm, 0.01mm, 0.02mm, 0.03mm, 0.04mm, 0.05mm, etc. It should be noted that the depth of the groove 120 refers to the depth of the groove 120 relative to the tooth groove 112, for example Figure 2 The dashed line at the opening of the groove 120 in the drawings represents the profile line when the tooth groove 112 is configured as a continuous circular arc, so the maximum depth H1 of the groove 120 refers to the distance from the deepest part of the groove 120 to the dashed line. It can be understood that when H1 is less than 0.005mm, the depth of the groove 120 is shallow, and when the tool 200 is worn, it is still easy to produce a protrusion 121, so that the protrusion 121 and the needle tooth 130 produce wear. When H1 is greater than 0.05mm, the maximum depth of the groove 120 is large, the processing difficulty is large, and the stability and reliability of the overall structure of the tooth groove 112 are easily affected. Therefore, by reasonably designing the size of the maximum depth H1 of the groove 120, the wear of the needle tooth 130 and the protrusion 121 can be effectively reduced, and the stability and reliability of the overall structure of the tooth groove 112 can be improved.

[0053] It should be noted that by providing the convex part 231 at the tip of the cutting edge 230 of the tool 200, the groove 120 can be machined at the same time as the tooth groove 112 is machined, improving production efficiency. When the convex part 231 is worn, a protrusion 121 will be formed at the groove 120. Therefore, in the actual production of the needle tooth shell 100, there may be no protrusion 121 in the groove 120, or there may be a protrusion 121. Referring to Figure 3 As shown in the drawings, in the embodiment of the utility model, the groove 120 is provided with a protrusion 121, and on the projection plane perpendicular to the center axis of the inner hole 111, the profile line of the protrusion 121 is located on the side of the fitting circle of the tooth groove 112 away from the center of the needle tooth shell 100. The fitting circle of the tooth groove 112 is shown by the dashed line in Figure 3 Since the profile line of the tooth groove 112 is a circular arc, the radius of the fitting circle is the same as the radius of the tooth groove 112. Since the protrusion 121 is located on the side of the fitting circle of the tooth groove 112 away from the center of the needle tooth shell 100, even if the protrusion 121 is produced, the needle tooth 130 and the protrusion 121 can be effectively avoided from contacting, thereby avoiding the wear between the needle tooth 130 and the protrusion 121, and the service life of the needle tooth shell 100 can be improved.

[0054] In the embodiment of the utility model, a plurality of protrusions 121 are arranged in the groove 120 along the circumference of the groove 120. It can be understood that, due to uneven wear of the cutter 200, in actual processing, the plurality of protrusions 121 can be generated, thus only the protrusions 121 located outside the fitting circle of the tooth groove 112 are needed to be ensured, the contact between the needle tooth 130 and the protrusion 121 can be avoided, the wear is reduced, and the reliability of the needle tooth shell 100 is improved.

[0055] It should be noted that, in addition to directly processing the groove 120 by setting the convex part 231 at the tip of the cutting edge 230 of the cutter 200, the groove 120 can also be processed by other cutters 200 after the tooth groove 112 is processed, and a suitable processing scheme is selected according to the actual situation.

[0056] The speed reducer in an embodiment of the utility model can be an RV speed reducer or a cycloid speed reducer, and the speed reducer comprises the needle tooth shell 100 in the above embodiment. The speed reducer in the embodiment of the utility model adopts the needle tooth shell 100 in the above embodiment, the inner hole 111 is arranged on the base body 110, the plurality of tooth grooves 112 are arranged around the circumferential wall of the inner hole 111, and the inner wall of the plurality of tooth grooves 112 is correspondingly provided with the groove 120. Since the contact angle of the needle tooth 130 and the tooth groove 112 is generally not at the bottom of the tooth groove 112, the groove 120 is arranged in the region of 0° to 20° on one side of the symmetry line of the tooth groove 112 profile line and the region of 0° to 20° on the other side, the stress points of the needle tooth 130 and the needle tooth shell 100 can be effectively avoided on the groove 120, the needle tooth 130 can conveniently transmit the force to the needle tooth shell 100 through the tooth groove 112. Due to the existence of the groove 120, the wear between the protrusion 121 and the needle tooth 130 can be effectively avoided, the generation of abrasive particles is reduced, and the situation of accelerated wear of the needle tooth shell 100 is reduced, so that the reliability and service life of the needle tooth shell 100 are improved.

[0057] Since the speed reducer adopts all the technical solutions of the needle tooth shell 100 in the above embodiment, at least all the beneficial effects brought by the technical solutions in the above embodiment are possessed, and details are not repeated here.

[0058] The embodiment of the utility model discloses a pin gear shell 100, planetary carrier, crank shaft, cycloidal wheel 400 and bearing, pin gear shell 100 has the hole 111 and the plurality of tooth slot 112 of the week wall setting around the hole 111, the plurality of tooth slot 112 is correspondingly equipped with pin gear 130 respectively. Planetary carrier is set in pin gear shell 100 and can rotate relative to pin gear shell 100. A plurality of crank shafts can be rotatably supported on the planetary carrier. The crank shaft includes an eccentric portion. The cycloidal wheel 400 is connected to the eccentric portion of the plurality of crank shafts to enable the cycloidal wheel 400 to rotate and oscillate within the pin gear shell 100. The bearing is used to support the planetary carrier and the pin gear shell 100 to enable the planetary carrier and the pin gear shell 100 to rotate and connect. The inner wall of the tooth slot 112 includes a stress area, which is configured to abut against the pin gear 130. The inner wall of the tooth slot 112 is provided with a groove 120, and the groove 120 is located outside the stress area. It should be noted that the stress area refers to the area where the surface of the pin gear 130 and the inner wall of the groove 120 abut during the operation of the speed reducer.

[0059] It can be understood that by adopting the above scheme, the speed reducer includes a pin gear shell 100, a planetary carrier, a plurality of crank shafts, a cycloidal wheel 400, and a bearing. The crank shafts can drive the cycloidal wheel 400 to oscillate. The cycloidal wheel 400 cooperates with the plurality of pin gears 130 to rotate the pin gear shell 100 relative to the planetary carrier under the support of the bearing. Since the groove 120 is located outside the stress area of the tooth slot 112, the groove 120 does not affect the transmission of the pin gear 130, which facilitates the transmission of force from the pin gear 130 to the pin gear shell 100 and improves the reliability and stability of the operation of the speed reducer. It should be noted that since the groove 120 is located outside the stress area, it cannot serve as an oil reservoir. The oil reservoir is usually required to be arranged in the stress area so that the lubricating oil in the oil reservoir flows to both sides to lubricate the pin gears when under pressure. The cross-sectional area of the oil reservoir affects the oil storage capacity, so the oil reservoir needs to have a suitable volume. However, the groove 120 of the present application needs to be arranged in a non-stress area and has a small opening area, so it is also difficult to serve as an oil reservoir.

[0060] Referring to Figure 6 , Figure 7 and Figure 8 , the utility model discloses a cutter 200, which is used for machining the pin gear shell 100 of the above-mentioned embodiment. The cutter 200 includes a mounting portion 210, an annular portion 220, and a plurality of cutting edges 230. The mounting portion 210 is used for connecting with a machine tool. The annular portion 220 is connected to the mounting portion 210 and is annular. The plurality of cutting edges 230 are arranged along the circumference of the annular portion 220 and are connected to the outer peripheral wall of the annular portion 220. The cutting edges 230 are used for machining the tooth slots 112. The tip of at least one cutting edge 230 is provided with a protrusion 231, which is used for machining the groove 120.

[0061] Understandably, by adopting the above solution and providing a protrusion 231 at the tip of the cutting edge 230, the tool 200 can machine the groove 120 simultaneously with the tooth groove 112, thereby saving processes and eliminating the need for additional processes to machine the groove 120, thus improving production efficiency. Simultaneously, the machining accuracy requirement for the groove 120 is lower than the accuracy requirement for the arc contour of the tooth groove 112. Therefore, the machining difficulty of the needle tooth shell 100 and the manufacturing difficulty of the tool 200 can be significantly reduced, thereby lowering production costs. When the number of cutting edges 230 and the number of tooth grooves 112 are coprime, only one cutting edge 230 needs to have the protrusion 231 provided. During the continuous rotation of the tool 200, the protrusion 231 can smoothly machine the groove 120 in all the tooth grooves 112.

[0062] Reference Figure 8 As shown, Figure 8 The diagram shows a simplified illustration of a cutting edge 230 located within a tooth groove 112. In this embodiment, the maximum height of the protrusion 231 protruding from the cutting edge 230 is H2, satisfying the condition: 0.005mm ≤ H2 ≤ 0.05mm. For example, the value of H2 can be 0.005mm, 0.01mm, 0.02mm, 0.03mm, 0.04mm, 0.05mm, etc. It is understood that when H2 is less than 0.005mm, the depth of the machined groove 120 is shallow, the protrusion 231 is prone to wear and failure, and protrusions 121 are easily generated, causing wear between the protrusions 121 and the needle teeth 130. When H2 is greater than 0.05mm, the depth of the groove 120 machined by the protrusion 231 is large, which can easily affect the stability and reliability of the overall structure of the tooth groove 112. Therefore, by rationally designing the maximum height H2 of the recess, the wear of the needle tooth 130 and the protrusion 121 can be effectively reduced, while also improving the overall stability and reliability of the tooth groove 112.

[0063] In the embodiments of this utility model, the tips of all the blades 230 are provided with protrusions 231, thereby adapting to different numbers of tooth grooves 112, improving the versatility of the tool 200, and delaying the wear of the protrusions 231, thus increasing the service life of the tool 200.

[0064] It is understandable that machining the tooth groove 112 can be divided into roughing and finishing, and different cutting tools 200 are used to complete the roughing and finishing processes. The groove 120 can be machined in the roughing stage, and the groove 120 is further machined in the finishing stage. The depth of the groove 120 is the depth of the roughing stage plus the depth of the finishing stage.

[0065] In the related art, when measuring the distance between the centers of the two tooth grooves 112 that are symmetrically arranged at the center of the needle tooth shell 100, the two ends of the measuring tool 300 need to abut against the bottom of the tooth groove 112. When the bottom of the tooth groove 112 has a protrusion 121 or a groove 120, the measurement accuracy will be affected.

[0066] In order to improve the measurement accuracy, as shown in Figure 9 , Figure 10 and Figure 11 , the utility model discloses a measuring tool 300 for measuring the distance between the centers of the two tooth grooves 112 that are symmetrically arranged at the center of the needle tooth shell 100. The measuring tool 300 comprises a connecting rod 310, a fixed part 320, a movable part 330, an elastic member 340 and an indicating meter 350. The fixed part 320 is fixedly connected to one end of the connecting rod 310. The fixed part 320 comprises a first measuring head 321. The first measuring head 321 is provided with a first side surface 322 at the end away from the connecting rod 310. The first measuring head 321 is provided with a first abutment part 323 at each end of the first side surface 322. The other end of the connecting rod 310 is provided with a slot. The elastic member 340 is arranged in the slot. The movable part 330 is inserted into the slot and abuts against the elastic member 340. The indicating meter 350 is installed on the connecting rod 310 and connected to the movable part 330. The movable part 330 comprises a second measuring head 331. The second measuring head 331 is provided with a second side surface 332 at the end away from the connecting rod 310. The second measuring head 331 is provided with a second abutment part 333 at each end of the second side surface 332. The indicating meter 350 can be a dial gauge or a micrometer gauge, or other meters capable of displaying readings, so as to reflect the distance between the centers of the two tooth grooves 112 that are symmetrically arranged.

[0067] When the measuring tool 300 is inserted into the inner hole 111, the first side surface 322 is arranged at intervals with the groove 120 in the corresponding tooth groove 112, and the first abutment part 323 abuts against the inner wall of the corresponding tooth groove 112. The second side surface 332 is arranged at intervals with the groove 120 in the corresponding tooth groove 112, and the second abutment part 333 abuts against the inner wall of the corresponding tooth groove 112.

[0068] With the above scheme, when the distance between the centers of the two tooth grooves 112 that are centrally symmetric needs to be measured, the first measuring head 321 is inserted into one of the tooth grooves 112, and the second measuring head 331 is inserted into the other tooth groove 112. Since the movable part 330 and the elastic member 340 abut, the movable part 330 can drive the second measuring head 331 to move along the length direction of the connecting rod 310, so that the second abutting part 333 of the second measuring head 331 can stably abut on the inner wall of the tooth groove 112. Since the first side surface 322 and the second side surface 332 are spaced apart from the corresponding grooves 120, when the distance between the centers of the two tooth grooves 112 that are centrally symmetric is measured, the measuring gauge 300 is not affected by the grooves 120 and the protrusions 121, so that the measurement accuracy can be improved. Selecting the appropriate size of the cycloid wheel 400 according to the distance between the centers of the two tooth grooves 112 can improve the rationality and reliability of the assembly of the speed reducer.

[0069] It should be noted that the method of using the measuring gauge 300 can be: first, a standard part corresponding to the needle tooth shell 100 of a corresponding model is manufactured. The manufacturing standard of the standard part requires higher accuracy and smaller size error, so the default standard part is 0 tolerance. The two ends of the measuring gauge 300 are placed in the two tooth grooves 112 that are centrally symmetric in the needle tooth shell 100, and the indication in the indicating table 350 is reset to zero, and then the measuring gauge 300 can be used to measure the related dimensions of the produced needle tooth shell 100. The positive and negative numbers on the indicating table 350 can reflect the tolerance of the dimensions of the needle tooth shell 100 relative to the dimensions of the standard part.

[0070] Referring to Figure 10 and Figure 11 In the embodiment of the utility model, the first abutting part 323 is configured as a rounded corner, and the second abutting part 333 can also be configured as a rounded corner. By abutting with the inner wall of the tooth groove 112 in the form of a rounded corner, the first abutting part 323 and the second abutting part 333 can effectively avoid scratching the surface of the tooth groove 112, improve the safety of measurement, and ensure that the needle tooth shell 100 meets the relevant standard requirements. At the same time, the first abutting part 323 and the second abutting part 333 in the form of a rounded corner also facilitate the production and manufacture of the measuring gauge 300, and the production efficiency is high.

[0071] Continuing to refer to Figure 10 and Figure 11As shown, in the embodiment of the utility model, the contact angle of the first abutting portion 323 and the tooth groove 112 is less than or equal to 45 DEG, and the contact angle of the second abutting portion 333 and the tooth groove 112 is also less than or equal to 45 DEG. It should be noted that the contact angle refers to the included angle between the normal line of the contact point of the abutting portion and the inner wall of the tooth groove 112 and the center line of symmetry of the tooth groove 112. When the contact angle is greater than 45 DEG, since the machining precision of the tooth groove 112 is lower and lower as it is closer to its opening, the measurement error will be larger and larger. Therefore, by limiting the contact angle to be less than or equal to 45 DEG, the accuracy of the measuring tool 300 can be improved.

[0072] With reference to Figure 10 And Figure 11 As shown, in the embodiment of the utility model, the first side surface 322 is a plane, and the second side surface 332 can also be a plane, which is convenient for processing and facilitates the production and manufacturing of the measuring tool 300. It should be noted that in other embodiments, the first side surface 322 and the second side surface 332 can also be concave arc surfaces, convex arc surfaces, etc., and the appropriate form is selected according to the actual situation, as long as the first side surface 322 and the second side surface 332 can avoid contacting the groove 120.

[0073] With reference to Figure 9 As shown, in the embodiment of the utility model, the elastic member 340 is a spring, and the spring can be sleeved on the movable portion 330. The spring is mature in technology, easy to obtain and low in production cost. It should be noted that in other embodiments, the elastic member 340 can also be an elastic rubber member, a silica gel member, a plastic member, etc., and the appropriate scheme is selected according to the actual situation.

[0074] The embodiments of the utility model are described in detail above in combination with the drawings, but the utility model is not limited to the above-mentioned embodiments, and various changes can be made within the knowledge range of ordinary skilled persons in the art without departing from the purpose of the utility model.

Claims

1. A pin tooth shell characterized by, The application relates to a needle-tooth shell, which comprises the following parts: a base body provided with an inner hole and a plurality of tooth grooves arranged around the peripheral wall of the inner hole; a plurality of grooves arranged on the inner wall of the plurality of tooth grooves; wherein, in the projection plane perpendicular to the central axis of the inner hole, the profile line of the tooth groove is a circular arc with the center O, and the profile line of the groove and the profile line of the tooth groove have two intersection points, one of which and the line connecting the O point and the symmetric center line of the profile line of the tooth groove form an angle alpha, which satisfies 0 < alpha <= 20 degrees, and the other intersection point and the line connecting the O point and the symmetric center line of the profile line of the tooth groove form an angle beta, which satisfies 0 < beta <= 20 degrees.

2. The pin gear housing of claim 1, wherein: Along the radial direction of the needle-tooth shell, the maximum depth of the groove is H1, which satisfies 0.005 mm <= H1 <= 0.05 mm.

3. The pin gear housing of claim 1, wherein: The groove is provided with a protrusion, and in the projection plane perpendicular to the central axis of the inner hole, the profile line of the protrusion is located on the side of the fitting circle of the tooth groove away from the center of the needle-tooth shell.

4. The pin gear housing of claim 3, wherein: A plurality of protrusions are arranged in one of the grooves.

5. A speed reducer characterized by: The application further relates to a tool comprising the needle-tooth shell.

6. A speed reducer characterized by: The application relates to a tool, which comprises the following parts: a needle-tooth shell provided with an inner hole and a plurality of tooth grooves arranged around the peripheral wall of the inner hole, and a plurality of needle teeth arranged in the plurality of tooth grooves respectively; a planet carrier arranged in the needle-tooth shell and capable of rotating relative to the needle-tooth shell; a plurality of crank shafts rotatably supported on the planet carrier, wherein the crank shafts comprise eccentric parts; a trochoid wheel connected with the eccentric parts of the plurality of crank shafts and capable of swinging and rotating in the needle-tooth shell, a bearing for supporting the planet carrier and the needle-tooth shell to make the planet carrier and the needle-tooth shell rotatably connected, wherein the inner wall of the tooth groove comprises a stress area configured to abut against the needle teeth, and the inner wall of the tooth groove is provided with a groove located outside the stress area.

7. A tool for machining the pinion housing according to any one of claims 1 to 4, characterized in that The tool comprises a mounting part, an annular part and a plurality of cutting edges, the annular part is connected to the mounting part, the plurality of cutting edges are arranged along the circumferential direction of the annular part and connected to the outer peripheral wall of the annular part, the cutting edges are used for machining the tooth grooves, the tip of at least one cutting edge is provided with a protrusion, and the protrusion is used for machining the groove.

8. The tool of claim 7 wherein: The maximum height of the protrusion protruding from the cutting edge is H2, which satisfies 0.005 mm <= H2 <= 0.05 mm.

9. The knife of claim 7, wherein: The tips of all the cutting edges are respectively provided with the protrusions.

10. A gauge for measuring the distance between the centers of the two tooth slots of the pin tooth shell center symmetry according to any one of claims 1 to 4, characterized in that, The measuring tool comprises a connecting rod, a fixed part, a movable part, an elastic member and an indicating table, the fixed part is fixedly connected to one end of the connecting rod, the fixed part comprises a first measuring head, the first measuring head is provided with a first side surface away from one end of the connecting rod, and the first measuring head is provided with a first abutting part at both ends of the first side surface respectively. Another end of the connecting rod is provided with a slot, the elastic member is arranged in the slot, the movable part is inserted into the slot and abuts against the elastic member, the indicating table is installed on the connecting rod and connected with the movable part, the movable part comprises a second measuring head, one end of the second measuring head away from the connecting rod is provided with a second side surface, and the second measuring head is respectively provided with a second abutting part at both ends of the second side surface. When the measuring tool is inserted into the inner hole, the first side surface and the corresponding recess in the tooth groove are arranged at intervals, and the first abutting part abuts against the inner wall of the corresponding tooth groove; the second side surface and the corresponding recess in the tooth groove are arranged at intervals, and the second abutting part abuts against the inner wall of the corresponding tooth groove.

11. The gauge of claim 10, wherein: The first abutting part is configured as a round corner; and / or The second abutting part is configured as a round corner.

12. The gauge of claim 10, wherein: The first side surface is a plane; and / or The second side surface is a plane.

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