Two-shaft gear axial limiting structure

Abstract

The utility model relates to an axial limiting structure, in particular to an axial limiting structure of a two-shaft gear, and solves the problems that a clamp spring is easy to damage and the surfaces of shafts are scratched in the operation process due to the fact that the clamp spring is matched with a clamping groove for axial limiting in an existing gear limiting structure, the clamp spring is deformed after being used for several times and needs to be replaced, and the cost is high. In order to solve the problem of resource waste due to the fact that a transmission spline pad is matched with a limiting isolation pad, the two-shaft gear is limited, one side of the two-shaft gear is limited by abutting against a spline pad arranged in a spline pad groove, and rotation of the spline pad is limited through a hexagonal key. The axial position of the hexagonal key is limited through the two-shaft gear and the elastic cylindrical pin; a mounting groove is formed in the other side of the two-shaft gear, an annular groove is formed in the position, corresponding to the mounting groove, of the two shaft, the ends of two semi-annular limiting isolation pads are oppositely arranged in the sliding grooves to abut against and limit the other side of the two-shaft gear, and the limiting isolation pads are fastened through isolation pad fastening rings arranged on the outer rings of the limiting isolation pads in a sleeving mode.

Description

Technical Field

[0001] The utility model relates to an axial limiting structure, in particular to an axial limiting structure for a two-shaft gear. Background Art

[0002] The gearbox is one of the important parts of the automobile. The power of the automobile engine is input through the first shaft of the gearbox, and different gears are obtained through the meshing of the gear sets on the intermediate shaft, and finally output through the second shaft. Because the second shaft needs to mesh with the gears of the intermediate shaft to transmit torque, and also needs to output torque to the corresponding transmission components, the second shaft is generally provided with a second shaft gear for meshing with the intermediate shaft gear and an external spline that cooperates with the corresponding transmission components. The second shaft gear on the currently commonly used six-speed double intermediate shaft gearbox is mainly axially limited by a spline washer, such as Figure 1 As shown, the outer wall of the second shaft 1 is provided with an external spline, and the inner ring of the two spline pads 2 is provided with an internal spline. During assembly, the spline pads 2 are assembled to the spline pad groove 12 of the specified gear along the axial direction of the second shaft 1, and then rotated to a certain angle so that the internal teeth of the spline pads 2 collide with the external teeth of the second shaft 1, which plays the role of axial limit. To prevent the spline pads 2 from rotating during use, after the spline pads 2 are assembled, a hexagonal key 4 is installed along the spline groove of the second shaft 1, and then the elastic cylindrical pin 7 is used to limit the axial position of the hexagonal key 4. The hexagonal key 4 cooperates with the internal spline of the spline pad 2 and the external spline of the second shaft 1 to limit the rotation of the spline pad 2. The whole set of structures is complex and requires high matching accuracy. When encountering some special second shafts, such as some second shafts that cannot be machined with external splines on the second shaft on one side of the second shaft gear due to structural limitations, ordinary spline pads cannot be used for axial limit.

[0003] The Chinese utility model patent with authorization announcement number CN215720703U discloses a gear limiting structure, which can be used for two-axis gear limiting, and includes a shaft, a gear, a bearing, a bearing end cover and an axial limiting assembly; the bearing is sleeved on one end of the shaft, and the bearing end cover is installed on the outside of the bearing; the gear is detachably sleeved on the outside of the shaft; the axial limiting assembly includes a spacer and a retaining spring, the spacer is detachably sleeved on the shaft, the two ends of the spacer are respectively in contact with the bearing and the gear, and the retaining spring is sleeved on the side of the gear away from the spacer. The above utility model solves the problem that when the two shafts on one side of the two-axis gear cannot be machined with external splines due to structural limitations, it is impossible to use ordinary spline washers for axial limiting. However, the retaining spring needs to be stretched and deformed during installation and then inserted into the corresponding slot. The retaining spring is easily damaged during operation and causes scratches on the surface of the shaft. Moreover, the retaining spring will deform after being used several times and needs to be replaced, resulting in a waste of resources. Utility Model Content

[0004] The purpose of the utility model is to solve the problem that the existing gear limiting structure adopts the cooperation of the retaining spring and the retaining groove for axial limiting, the retaining spring is easily damaged during operation and the surface of the shaft is scratched, and the retaining spring will be deformed after being used several times and needs to be replaced, resulting in a waste of resources, and to provide a two-axis gear axial limiting structure.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A two-shaft gear axial limiting structure comprises two shafts and two-shaft gears sleeved on the two shafts, wherein the inner ring of the two-shaft gear is provided with an internal spline for matching with the external spline on the outer surface of the two shafts, and the special features thereof are:

[0007] Also included are a spline washer, a limit spacer, and a spacer fastening ring;

[0008] The spline pad is arranged in the spline pad groove on the second shaft, the outer side of the spline pad abuts against the outer spline of the second shaft, and the inner side abuts against the gear of the second shaft; a hexagonal key is arranged in the spline groove on the second shaft, and the hexagonal key is used to cooperate with the outer spline of the second shaft and the inner spline of the inner ring of the spline pad to limit the rotation of the spline pad, and an elastic cylindrical pin is arranged on the second shaft, the inner end face of the hexagonal key abuts against the gear of the second shaft, and the outer end face abuts against the elastic cylindrical pin;

[0009] A mounting groove is provided on one side of the second shaft gear away from the spline pad, and an annular groove is provided on the second shaft corresponding to the mounting groove position. The limit spacer is a semi-annular structure, and two limit spacers are provided. Both limit spacers are located in the annular groove and the ends of the two limit spacers are opposite to each other; the inner side wall of the limit spacer abuts against the bottom of the mounting groove, and the outer side wall abuts against the outer side wall of the annular groove;

[0010] The spacer fastening ring is arranged in the installation groove, and the inner ring of the spacer fastening ring is sleeved on the outer rings of the two limiting spacers.

[0011] Furthermore, a chamfer is provided at the intersection of the inner ring of the limiting spacer and the end surface.

[0012] Furthermore, an abutment ring is provided on one side of the second-shaft gear abutting against the spline pad, and the inner side surface of the spline pad and the inner end surface of the hexagonal key are both abutted against the abutment ring.

[0013] Furthermore, there is a gap between the outer ring of the spacer fastening ring and the inner wall of the mounting groove.

[0014] Furthermore, the limiting spacer is a 45# steel limiting spacer, and the spacer fastening ring is a 45# steel spacer fastening ring.

[0015] Furthermore, the thickness of the limiting spacer and the spacer fastening ring is 5-10 mm.

[0016] Compared with the prior art, the beneficial effects of the utility model are:

[0017] (1) The utility model provides an axial limit structure for two-axis gears, including two shafts and two-axis gears sleeved on the two shafts. A spline washer is arranged in a spline washer groove on the two shafts, and the spline washer is stopped by a hexagonal key. Then, an elastic cylindrical pin cooperates with the two-axis gears to complete the axial position limitation of the hexagonal key. In this way, the axial limit of one side of the two-axis gear is completed. On the other side of the two-axis gear, because the external spline cannot be machined due to the structure of the two shafts, the axial limit is completed by cooperating a limit spacer and a spacer fastening ring. A mounting groove is provided on the side of the two-axis gear away from the spline washer, and an annular groove is provided on the two shafts corresponding to the position of the mounting groove. The ends of the limiting spacers of the semi-annular structure are relatively located in the annular groove, the inner wall of the limiting spacer abuts against the bottom of the mounting groove, and the outer wall abuts against the outer wall of the annular groove. The spacer fastening ring is arranged in the mounting groove, and the inner ring of the spacer fastening ring is sleeved on the outer rings of the two limiting spacers, thereby realizing the axial limitation of the other side of the two-axis gears. During installation, the two limiting spacers can be installed first, and then the spacer fastening ring can be sleeved on the outer rings of the two limiting spacers to prevent the two limiting spacers from separating. There is no need to deform the limiting spacers during removal and installation, and they can be used for a long time, which solves the problem that the retaining spring will be deformed after being used several times and needs to be replaced, resulting in a waste of resources.

[0018] (2) The utility model provides an axial limiting structure for two-shaft gears, in which a chamfer is arranged at the intersection of the inner ring and the end face of the limiting spacer, so that during the disassembly and assembly process, the edges of the limiting spacer can be prevented from scratching the surfaces of the two shafts, and the gap formed between the two opposite chamfers can allow the lubricating oil in the gearbox to flow through, lubricating the two shafts and other components, thereby achieving a better lubrication effect.

[0019] (3) The utility model provides a two-axis gear axial limiting structure with a gap between the outer ring of the spacer fastening ring and the inner wall of the installation groove. This gap can facilitate the installer to remove the spacer fastening ring and the limiting spacer.

[0020] (4) The limiting spacer and the spacer fastening ring in the two-axis gear axial limiting structure provided by the utility model are both made of 45# steel. 45# steel is widely used in the industrial field and has a low cost. The limiting spacer and the spacer fastening ring have simple structures and are easy to process. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is an exploded schematic diagram of the existing two-shaft gear axial limiting structure;

[0022] Figure 2 This is a partial cross-sectional view of an embodiment of the two-axis gear axial limiting structure of the utility model (the hexagonal key and the elastic cylindrical pin are not shown in the figure);

[0023] Figure 3 This is a schematic diagram of the structure of two limiting spacers in an embodiment of the utility model;

[0024] Figure 4 This is a schematic diagram of the structure of the spacer fastening ring in the embodiment of the utility model;

[0025] Figure 5 It is a structural schematic diagram of the ring groove and the spline gasket groove in the embodiment of the utility model.

[0026] The following are the descriptions of the reference numerals:

[0027] 1-second shaft, 11-ring groove, 12-spline pad groove; 2-spline pad, 3-second shaft gear, 31-mounting groove,

[0028] 32-butt ring; 4-hexagonal key, 5-limiting spacer, 6-spacer fastening ring, 7-elastic cylindrical pin. DETAILED DESCRIPTION

[0029] The utility model is further described below in conjunction with the accompanying drawings and specific embodiments.

[0030] The existing two-axis gear axial limit structure is as follows Figure 1 As shown, external splines are provided on the outer walls of the two shafts 1, and internal splines are provided on the inner rings of the two spline pads 2. During assembly, the spline pads 2 are assembled to the spline pad grooves 12 of the specified gear along the axial direction of the two shafts 1, and then rotated by a certain angle so that the internal teeth of the spline pads 2 conflict with the external teeth of the two shafts 1, thereby playing the role of axial limiting. To prevent the spline pads 2 from rotating during use, a hexagonal key 4 is installed along the spline grooves of the two shafts 1 after the spline pads 2 are assembled, and the axial position of the hexagonal key 4 is limited by elastic cylindrical pins 7. The hexagonal key 4 cooperates with the internal splines of the spline pads 2 and the external splines of the two shafts 1 to limit the rotation of the spline pads 2. The whole set of structures is complex and requires high matching accuracy.

[0031] The utility model of the two-axis gear axial limiting structure is as follows Figure 2-Figure 5 As shown, the axial limiting structure of the ordinary two-axis gear is the same as that of the two-axis gear 1 and the two-axis gear 3. The inner ring of the two-axis gear 3 is provided with an internal spline, and the outer surface of the two-axis 1 is provided with an external spline. The two-axis gear 3 is sleeved on the two-axis 1 through the internal and external splines.

[0032] Due to structural limitations, the second shaft 1 in the present invention cannot be machined with splines on one side of the second shaft gear 3, so the present invention adopts the traditional spline pad 2 and the limiting spacer 5 to complete the axial positioning of the second shaft gear 3.

[0033] The arrangement of the spline pad 2 is the same as that of the axial limiting structure of the common two-shaft gear. The spline pad 2 in this embodiment is arranged in the spline pad groove 12 provided on the two-shaft 1, and the outer side of the spline pad 2 abuts against the outer spline of the two-shaft 1, and the inner side abuts against the two-shaft gear 3. An abutment ring 32 is arranged on the side where the two-shaft gear 3 abuts against the spline pad 2. The abutment ring 32 is arranged integrally with the two-shaft gear 2, and the inner side of the spline pad 2 abuts against the abutment ring 32. A hexagonal key 4 is arranged in the spline groove on the two-shaft 1. The hexagonal key 4 is used to cooperate with the outer spline of the two-shaft 1 and the inner spline of the inner ring of the spline pad 2 to limit the rotation of the spline pad 2. In order to limit the axial position of the hexagonal key 4, an elastic cylindrical pin 7 is arranged on the two-shaft 1, and the elastic cylindrical pin 7 is screwed into the threaded hole on the two-shaft 1. The inner end face of the hexagonal key 4 abuts against the abutment ring 32 of the second-axis gear 3 , and the outer end face abuts against the elastic cylindrical pin 7 , thus completing the axial limiting of one side of the second-axis gear 3 .

[0034] Because it is impossible to process external splines on the second shaft 1 on the other side of the second shaft gear 3, a mounting groove 31 is provided on the side of the second shaft gear 3 away from the spline pad 2, and an annular groove 11 is provided on the second shaft 1 corresponding to the position of the mounting groove 31. Two limit spacers 5 are arranged in the annular groove 11, and the ends of the two limit spacers 5 relatively form an annular structure. The inner wall of the limit spacer 5 abuts against the bottom of the mounting groove 31, and the outer wall abuts against the outer wall of the annular groove 11. Because the limit spacer 5 needs to provide axial positioning for the second shaft gear 3, its strength has certain requirements. If the thickness is too thin, it may be damaged due to force during use. Therefore, the general thickness range of the limit spacer 5 is between 5-10mm, and it can be selected within this range according to actual conditions. In this embodiment, the thickness of the limit spacer 5 is 6.3mm, and the limit spacer 5 is processed using common 45# steel material. This steel is widely used in the industrial field and has a low cost. The structure of the limit spacer 5 is as follows Figure 3 As shown, it is a semi-annular structure, and a chamfer is provided at the intersection of its inner ring and the end face. This chamfer has two functions. First, it prevents the edges from scratching the surface of the two shafts 1 during installation and disassembly; second, because the entire two shafts 1 are arranged in the gearbox, the parts mounted on the two shafts 1 need to be lubricated during movement. When the ends of the two limit spacers 5 are opposite, the gap formed between the two opposite chamfers can allow the lubricating oil in the gearbox to flow through, lubricating the two shafts 1 and other parts, so that the lubrication effect is better.

[0035] In order to fasten the two limiting spacers 5 and prevent the two limiting spacers 5 from being separated during use, a spacer fastening ring 6 is further arranged in the mounting groove 31, and its structure is as follows: Figure 4As shown, the spacer fastening ring 6 is a circular ring structure, and its inner ring is sleeved on the outer rings of the two limiting spacers 5, so that the two limiting spacers 5 are fastened together, so that the limiting spacers 5 will not separate when rotating with the two shafts 1, and thus lose the limiting effect. The spacer fastening ring 6 is made of the same 45# steel material as the limiting spacers 5, and the thickness of the spacer fastening ring 6 ranges from 5 to 10 mm. In this embodiment, the thickness of the spacer fastening ring 6 is 6 mm. There is a gap between the outer ring of the spacer fastening ring 6 and the inner wall of the installation groove 31, and this gap can facilitate the installer to take out the spacer fastening ring 6 and the limiting spacer 5.

[0036] When in use, first the second shaft gear 3 is sleeved on the second shaft 1 through the inner and outer splines, and then the spline pad 2 is assembled to the spline pad groove 12 along the axial direction of the second shaft 1, and then rotated a certain angle so that the outer side surface of the spline pad 2 abuts against the outer splines of the second shaft 1, and the inner side surface abuts against the abutment ring 32 of the second shaft gear 3; then a hexagonal key 4 is installed along the spline groove of the second shaft 1, and the hexagonal key 4 cooperates with the outer splines of the second shaft 1 and the inner splines of the inner ring of the spline pad 2 to limit the rotation of the spline pad 2, and then the elastic cylindrical pin 7 is screwed into the threaded hole of the second shaft 1, and the inner end face of the hexagonal key 4 abuts against the abutment ring 32 of the second shaft gear 3, and the outer end face abuts against the elastic cylindrical pin 7, thereby completing the axial limitation of one side of the second shaft gear 3.

[0037] Subsequently, the two limiting spacers 5 are installed into the annular groove 11 so that the ends of the two spacers are opposite to each other to form a circular ring structure. At this time, the inner wall of the limiting spacer 5 abuts against the bottom of the mounting groove 31, and the outer wall abuts against the outer wall of the annular groove 11. Then the spacer fastening ring 6 is installed so that the inner ring of the spacer fastening ring 6 is sleeved on the outer rings of the two limiting spacers 5, thereby completing the axial limitation of the other side of the second shaft gear 3.

[0038] The embodiments described above are merely descriptions of the specific implementation methods of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A two-shaft gear axial limiting structure, comprising two shafts (1) and two-shaft gears (3) sleeved on the two shafts (1), wherein the inner ring of the two-shaft gear (3) is provided with an internal spline for cooperating with the external spline on the outer surface of the two shafts (1), characterized in that: It also includes a spline washer (2), a limiting spacer (5) and a spacer fastening ring (6); The spline pad (2) is arranged in a spline pad groove (12) on the second shaft (1), the outer side surface of the spline pad (2) abuts against the outer spline of the second shaft (1), and the inner side surface abuts against the second shaft gear (3); a hexagonal key (4) is arranged in the spline groove on the second shaft (1), and the hexagonal key (4) is used to cooperate with the outer spline of the second shaft (1) and the inner spline of the inner ring of the spline pad (2) to limit the rotation of the spline pad (2); an elastic cylindrical pin (7) is arranged on the second shaft (1), the inner end surface of the hexagonal key (4) abuts against the second shaft gear (3), and the outer end surface abuts against the elastic cylindrical pin (7); A mounting groove (31) is provided on the side of the second shaft gear (3) away from the spline pad (2); an annular groove (11) is provided on the second shaft (1) at a position corresponding to the mounting groove (31); the limiting spacer (5) is a semi-annular structure, and two of them are provided; both limiting spacers (5) are located in the annular groove (11) and the ends of the two limiting spacers (5) are opposite to each other; the inner side wall of the limiting spacer (5) abuts against the bottom of the mounting groove (31), and the outer side wall abuts against the outer side wall of the annular groove (11); The spacer fastening ring (6) is arranged in the installation groove (31), and the inner ring of the spacer fastening ring (6) is sleeved on the outer rings of the two limiting spacers (5).

2. The two-shaft gear axial limiting structure according to claim 1 is characterized in that: The intersection position between the inner ring and the end surface of the limiting spacer (5) is provided with a chamfer.

3. The two-shaft gear axial limiting structure according to claim 1 or 2, characterized in that: An abutment ring (32) is provided on one side of the two-shaft gear (3) abutting against the spline pad (2), and the inner side surface of the spline pad (2) and the inner end surface of the hexagonal key (4) both abut against the abutment ring (32).

4. The two-shaft gear axial limiting structure according to claim 3 is characterized in that: There is a gap between the outer ring of the spacer fastening ring (6) and the inner wall of the mounting groove (31).

5. The two-shaft gear axial limiting structure according to claim 4 is characterized in that: The limiting spacer (5) is a 45# steel limiting spacer, and the spacer fastening ring (6) is a 45# steel spacer fastening ring.

6. The two-shaft gear axial limiting structure according to claim 5 is characterized in that: The thickness of the limiting spacer (5) and the spacer fastening ring (6) is 5-10 mm.

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