CN114738392A

CN114738392A - Transmission mechanism, engine and working machine

Info

Publication number: CN114738392A
Application number: CN202210314457.4A
Authority: CN
Inventors: 孔德永; 李焱
Original assignee: Sany Heavy Machinery Ltd
Current assignee: Sany Heavy Machinery Ltd
Priority date: 2022-03-28
Filing date: 2022-03-28
Publication date: 2022-07-12

Abstract

The invention relates to the technical field of transmission, and provides a transmission mechanism, an engine and an operating machine, wherein the transmission mechanism comprises: a mounting portion, a support shaft, a transmission portion and a gear portion; the supporting shaft is connected with the mounting part and is in a cantilever structure which is vertical to the mounting surface of the mounting part along the axial direction; the transmission part is sleeved outside the support shaft; the gear part is sleeved outside the transmission part; wherein the gear part includes: a first gear and a second gear; the first gear and the second gear are connected along the axial direction of the supporting shaft from the supporting shaft to one side of the mounting part to form a step-shaped gear. According to the transmission mechanism, the engine and the operation machine, the gear transmission structure arranged in the step shape is provided, and is matched with the outer ring of the bearing, so that the heavy-load torque output and the excellent stability can be met under the specific space condition, the structure is compact and simple compared with the existing product, the weight is light, the service life requirement is met, and the competitiveness of the product can be improved.

Description

Transmission mechanism, engine and working machine

Technical Field

The invention relates to the technical field of transmission, in particular to a transmission mechanism, an engine and an operating machine.

Background

The gear transmission is a mechanical transmission mode and has wide application in engines, gearboxes and transfer cases of engineering machinery. The gear transmission has the advantages of accurate transmission, high efficiency, compact structure, reliable work, long service life and the like. However, under the condition of heavy-load torque, the arrangement of conventional gear transmission cannot meet the requirement, and when the heavy-load improvement is carried out on the gear transmission structure, the problems of large occupied space, complex structure and the like exist.

Disclosure of Invention

The invention provides a transmission mechanism, which is used for solving the defect that the conventional gear transmission structure in the prior art cannot meet the requirement of heavy-load torque.

The invention also provides an engine.

The invention also provides a working machine.

According to a first aspect of the present invention there is provided a transmission comprising: a mounting portion, a support shaft, a transmission portion and a gear portion;

the supporting shaft is connected with the mounting part and is of a cantilever structure which is vertical to the mounting surface of the mounting part along the axial direction;

the transmission part is sleeved outside the support shaft;

the gear part is sleeved outside the transmission part;

wherein the gear part includes: a first gear and a second gear;

the first gear and the second gear face one side of the installation part from the supporting shaft and are connected in the axial direction of the supporting shaft to form a step-shaped gear.

According to an embodiment of the present invention, further comprising: a limiting member and a connecting member;

the locating part passes through connecting piece detachable set up in the back shaft is relative the opposite side tip of installation department, and support and lean on gear portion.

Specifically, the present embodiment provides an embodiment of a limiting member and a connecting member, and the limiting member is provided to constrain the relative positions of the transmission portion and the gear portion on the supporting shaft.

Furthermore, through setting up the connecting piece, realized the dismantlement between locating part and the back shaft and be connected.

In the present invention, the gear portion is brought into contact with the outer ring of the power transmission portion, so that a sufficient mounting space can be obtained for the gear portion provided in a stepped shape.

According to an embodiment of the present invention, the support shaft is detachably coupled to the mounting portion by the coupling member.

Specifically, the present embodiment provides an implementation manner in which the support shaft is connected to the mounting portion, and by providing a detachable connection between the support shaft and the mounting portion, maintenance and replacement of the transmission portion, the support shaft, the gear portion, and the like are achieved. Meanwhile, the input and output torque can be conveniently adjusted according to the load.

According to an embodiment of the present invention, the transmission portion includes: the rolling bearing comprises a retainer, a first space ring and a rolling body;

the plurality of retainers are sleeved on the support shaft at intervals and are inserted into the gear holes of the stepped gear;

the first space ring is arranged between two adjacent retainers;

the plurality of rolling bodies are uniformly distributed on the retainer along the circumferential direction;

wherein the rolling bodies are in linear contact with the support shaft and the stepped gear, respectively.

Specifically, the embodiment provides an implementation mode of the transmission part, by arranging the retainer, an inner ring and an outer ring of the bearing are omitted, the problem that the relative position of the bearing needs to be adjusted in the process is avoided, the retainer can be directly installed with the support shaft and the stepped gear during installation, position adjustment is not needed, and the structure and installation are simplified.

Further, by arranging the rolling bodies, the existing point contact transmission is changed into line contact transmission brought by the rolling bodies, the contact area is increased, namely the rolling bodies are in line contact with the supporting shaft and the stepped gear respectively, the bearing capacity of the gear part is improved, the line contact enables the gear part to transmit larger torque, and a more compact structure is obtained through arrangement of the retainer.

According to one embodiment of the invention, the rolling elements are cylinders.

In particular, the present embodiment provides an embodiment of a rolling element.

According to an embodiment of the present invention, the transmission portion includes: a bearing and a second spacer ring;

the bearings are sleeved on the supporting shaft at intervals and are inserted into the gear hole of the stepped gear;

the second space ring is arranged between two adjacent bearings.

Specifically, the present embodiment provides an implementation manner of a transmission portion, in which a plurality of bearings and a plurality of second spacers are provided, so that the transmission of the gear portion and the support shaft is realized by a manner that an inner ring of the bearing is connected with the support shaft and an outer ring of the bearing is connected with the gear portion.

It should be noted that the bearings are separated by the second spacing rings, so that the risk of locking caused by too large width of the bearings due to too large axial distance of the gear part is avoided.

Further, in the selection of the bearing, the model in line contact with the supporting shaft and the gear part respectively can be selected, so that the gear part can obtain larger bearing capacity and transmit larger torque.

According to one embodiment of the invention, the first gear and the second gear are of an integrally formed construction.

Specifically, this embodiment provides a first gear and fashioned implementation mode of second gear, through adopting integrated into one piece's structure with first gear and second gear, has guaranteed whole drive mechanism's bearing, satisfies the heavy load transmission.

According to one embodiment of the invention, the diameter of the first gear is larger than the diameter of the second gear.

Specifically, the present embodiment provides an implementation of an arrangement relationship between a first gear and a second gear, wherein the first gear is disposed on a side close to the limiting member, the second gear is disposed on a side close to the mounting portion, and a diameter of the first gear is larger than a diameter of the second gear.

According to an embodiment of the present invention, further comprising: the oil filling port, the lubricating channel and the oil outlet;

the oil filling port is arranged on the mounting part;

the lubricating channel is arranged inside the supporting shaft and is respectively communicated with the oil filling port;

the oil outlets are uniformly distributed on the surface of the supporting shaft corresponding to the transmission part and are communicated with the lubricating channel.

Specifically, the present embodiment provides an implementation manner of the oil filling port, the lubrication passage, and the oil outlet, so that the lubrication manner is modified from conventional splash lubrication to the forced lubrication of the present invention by providing the oil filling port, the lubrication passage, and the oil outlet, thereby ensuring the lubrication effect and realizing the lubrication of the transmission portion and the gear portion.

According to a second aspect of the invention, there is provided an engine having a transmission as described above.

According to a third aspect of the present invention, there is provided a working machine having a transmission as described above, or an engine as described above.

One or more technical solutions in the present invention have at least one of the following technical effects: according to the transmission mechanism, the engine and the operation machine, the gear transmission structure is arranged in a step shape and is matched with the outer ring of the bearing, so that the heavy-load torque output and the excellent stability can be met under the specific space condition, the structure is compact and simple and the weight is light compared with the existing product, the service life requirement is met, and the competitiveness of the product can be improved.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is one of the schematic views of the assembly of the transmission mechanism provided by the present invention;

FIG. 2 is a second schematic view of the assembly of the transmission mechanism provided by the present invention;

FIG. 3 is a third schematic view of the assembly of the transmission mechanism provided by the present invention;

FIG. 4 is a fourth illustration of the assembly of the transmission mechanism provided by the present invention;

FIG. 5 is a fifth schematic view showing the assembly relationship of the transmission mechanism provided by the present invention.

Reference numerals:

10. an installation part;

20. a support shaft;

30. a transmission section; 31. a holder; 32. a first space ring; 33. a rolling body; 34. a bearing; 35. a second space ring;

40. a gear portion; 41. a first gear; 42. a second gear;

50. a limiting member;

60. a connecting member;

70. an oil filling port;

80. a lubrication channel;

90. and an oil outlet.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.

In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the embodiments of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In some embodiments of the present invention, as shown in fig. 1 to 5, the present solution provides a transmission mechanism comprising: a mounting portion 10, a support shaft 20, a transmission portion 30 and a gear portion 40; the supporting shaft 20 is connected with the mounting part 10, and the supporting shaft 20 is in a cantilever structure which is perpendicular to the mounting surface of the mounting part 10 along the axial direction; the transmission part 30 is sleeved outside the support shaft 20; the gear part 40 is sleeved outside the transmission part 30; wherein the gear portion 40 includes: a first gear 41 and a second gear 42; the first gear 41 and the second gear 42 are connected to each other in the axial direction of the support shaft 20 from the support shaft 20 toward the mounting portion 10 to form a stepped gear.

In detail, the invention provides a transmission mechanism, which is used for solving the defect that the conventional gear transmission structure in the prior art cannot meet the requirement of heavy-load torque, and the transmission mechanism is provided with the gear transmission structure arranged in a step shape and matched with the outer ring of a bearing, so that the heavy-load torque output and the excellent stability can be met under the specific space condition, the transmission mechanism is compact and simple in structure and light in weight compared with the existing product, the service life requirement is met, and the competitiveness of the product can be improved.

It should be noted that, in the conventional transmission mechanism, a support mode that the bearings 34 are arranged at both shaft ends of the support shaft 20 is adopted, and therefore, the problems of large occupied space, small bearing capacity and small gear transmission torque exist.

Further, the present invention, by arranging the supporting shaft 20 as a cantilever structure with one end connected to the mounting portion 10, saves space, makes the overall structure more compact, and improves the bearing capacity by the linear contact between the bearing 34 or the retainer 31 and the supporting shaft 20 and the gear portion 40, respectively, and also makes the gear portion 40 capable of transmitting a larger torque.

In some possible embodiments of the invention, the transmission mechanism further comprises: a retaining member 50 and a connecting member 60.

The limiting member 50 is disposed at an end of the supporting shaft 20 away from the mounting portion 10 and abuts against the gear portion 40 to restrict the displacement of the transmission portion 30 and the gear portion 40 along the axial direction of the supporting shaft 20.

The connecting member 60 is disposed at an end of the limiting member 50 away from the supporting shaft 20, and sequentially passes through the limiting member 50 and the supporting shaft 20, so as to detachably connect the limiting member 50 and the supporting shaft 20.

Specifically, the present embodiment provides an embodiment of the limiting member 50 and the connecting member 60, and the limiting member 50 is provided to achieve the relative position restriction of the transmission portion 30 and the gear portion 40 on the supporting shaft 20.

Further, by providing the connecting member 60, the detachable connection between the limiting member 50 and the supporting shaft 20 is achieved.

In the present invention, the gear portion 40 is brought into contact with the outer ring of the power transmission portion 30, so that the gear portion 40 provided in a stepped shape can obtain a sufficient mounting space.

In a possible embodiment, as shown in fig. 1 and 3, the connecting member 60 is a rod-shaped structure having an external thread, the limiting member 50 is disposed behind the end of the supporting shaft 20, and the connecting member 60 is inserted through the limiting member 50 and engaged with a threaded hole in the supporting shaft 20, so as to achieve the detachable connection between the limiting member 50 and the supporting shaft 20.

In a possible embodiment, the connecting member 60 is a special bolt, so that the reliable connection between the pressure plate and the gear shaft is ensured, and the stability of the cantilever structure is ensured.

In a possible embodiment, the number of connectors 60 is at least two.

In a possible embodiment, the number of the connecting members 60 is three, and the connecting members are uniformly distributed on the surface of the limiting member 50 in the axial direction of the supporting shaft 20.

In a possible embodiment, the number of the connecting members 60 is four, and the connecting members are uniformly distributed on the surface of the limiting member 50 in the axial direction of the supporting shaft 20.

In a possible embodiment, as shown in fig. 2, the other side of the supporting shaft 20 opposite to the limiting member 50 is provided with a boss, the diameter of the boss is larger than that of the supporting shaft 20, a region for installing the transmission portion 30 and the gear portion 40 is formed between the boss and the limiting member 50, and the boss and the limiting member 50 are respectively abutted against the transmission portion 30 to realize the constraint.

In some possible embodiments of the present invention, the support shaft 20 is detachably coupled to the mounting portion 10 by a coupling member 60.

Specifically, the present embodiment provides an embodiment in which the support shaft 20 is connected to the mounting portion 10, and by providing a detachable connection between the support shaft 20 and the mounting portion 10, maintenance and replacement of the transmission portion 30, the support shaft 20, the gear portion 40, and the like are achieved. Meanwhile, the input and output torque can be conveniently adjusted according to the load.

In a possible embodiment, the mounting portion 10 is provided with a coupling hole corresponding to the coupling member 60, an outer portion of the coupling member 60 is provided with an external thread, and an inner portion of the coupling hole is provided with an internal thread.

In a possible embodiment, the supporting shaft 20 is provided with a passage for the connection member 60 to pass through, and the connection member 60 is engaged with the threaded hole of the mounting portion 10 after passing through the limiting member 50 and the supporting shaft 20 in sequence, so as to realize the detachable connection between the limiting member 50, the supporting shaft 20 and the mounting portion 10.

In a possible embodiment, the mounting portion 10 is a structure for mounting the gear portion 40, which can be disposed at a corresponding transmission mounting position of an engine or a working machine, and the invention is not limited to this, and in practical applications, the mounting portion 10 can be used as a position where a gear transmission arrangement is actually required.

In some possible embodiments of the invention, as shown in fig. 1 and 2, the transmission part 30 comprises: a cage 31, a first cage 32, and rolling elements 33.

The plurality of retainers 31 are fitted around the support shaft 20 at intervals and are inserted into the gear holes of the step gear.

The first cage 32 is disposed between two adjacent cages 31.

The plurality of rolling elements 33 are uniformly arranged in the circumferential direction on the cage 31.

Wherein the rolling bodies 33 are in linear contact with the support shaft 20 and the stepped gear, respectively.

Specifically, the present embodiment provides an embodiment of the transmission part 30, by providing the retainer 31, the inner ring and the outer ring of the bearing 34 are omitted, the problem that the relative position of the bearing 34 needs to be adjusted in the process is avoided, the retainer 31 can be directly installed with the support shaft 20 and the stepped gear in the installation, no position adjustment is required, and the structure and installation are simplified.

Further, by providing the rolling bodies 33, the existing point contact transmission is changed into a line contact transmission by the rolling bodies 33, the contact area is increased, that is, the rolling bodies 33 are in line contact with the support shaft 20 and the stepped gear respectively, the bearing capacity of the gear part 40 is improved, the line contact enables the gear part 40 to transmit a larger torque, and a more compact structure is obtained by the arrangement of the retainer 31.

In an application scenario, when the transmission mechanism is installed, the supporting shaft 20 is fixed, the retainer 31, the first spacer 32 and the rolling element 33 are sequentially installed, then the step gear is installed on the supporting shaft 20, and the shaft end of the supporting shaft 20 is pressed through the limiting member 50, and the supporting shaft is directly formed into an integral structure without adjusting gaps among all components.

In some possible embodiments of the invention, the rolling elements 33 are cylinders.

Specifically, the present embodiment provides an embodiment of the rolling bodies 33, and the rolling bodies 33 are arranged as cylinders, and the linear contact between the rolling bodies 33 and the support shaft 20 and the gear portion 40, respectively, is realized.

In some possible embodiments of the invention, as shown in fig. 3 and 4, the transmission part 30 comprises: a bearing 34 and a second cage 35.

The plurality of bearings 34 are alternately fitted around the support shaft 20 and inserted into the gear holes of the stepped gear.

The second spacer 35 is disposed between two adjacent bearings 34.

Specifically, the present embodiment provides an embodiment of the transmission part 30, in which a plurality of bearings 34 and a plurality of second spacers 35 are provided, so that the transmission between the gear part 40 and the support shaft 20 is realized by connecting the inner ring of the bearing 34 and the support shaft 20 and connecting the outer ring of the bearing 34 and the gear part 40.

It should be noted that, the bearings 34 are separated by the second spacers 35, so that the risk of locking due to the too large width of the bearings 34 caused by the too large axial distance of the gear portion 40 is avoided.

Further, in the selection of the bearing 34, the model number in line contact with the supporting shaft 20 and the gear portion 40 can be selected, thereby ensuring that the gear portion 40 can obtain larger bearing capacity and transmit larger torque.

In a possible embodiment, the bearing 34 is a roller bearing.

In a possible embodiment, the bearing 34 is a tapered roller bearing.

In an application scenario, when the transmission mechanism is installed, the supporting shaft 20 is fixed, the bearing 34 and the second spacer 35 are sequentially installed, then the step gear is installed on the supporting shaft 20, and the shaft end of the supporting shaft 20 is pressed through the limiting member 50, without adjusting gaps between the components, and the whole structure is directly formed.

In some possible embodiments of the present invention, the first gear 41 and the second gear 42 are an integrally formed structure.

Specifically, the present embodiment provides an implementation manner of molding the first gear 41 and the second gear 42, and by using an integrally molded structure for the first gear 41 and the second gear 42, the load bearing of the entire transmission mechanism is ensured, and heavy load transmission is satisfied.

In some possible embodiments of the invention, the diameter of the first gear 41 is greater than the diameter of the second gear 42.

Specifically, the present embodiment provides an embodiment of the arrangement relationship of the first gear 41 and the second gear 42, the first gear 41 is disposed on a side close to the limiting member 50, the second gear 42 is disposed on a side close to the mounting portion 10, and the diameter of the first gear 41 is larger than that of the second gear 42.

In a possible embodiment, since the support shaft 20 is fixed with the inner ring of the transmission part 30, when a load is input from one end of the first gear 41, the step gear rotates together with the outer ring of the bearing and stabilizes output torque, then the torque is transmitted to the other end of the first gear 41 and the second gear 42, and finally output from the other end of the first gear 41 and the second gear 42, satisfying heavy load transmission.

In a possible embodiment, the width of the first gear 41 in the direction of the support shaft 20 is greater than the width of the second gear 42 in the direction of the support shaft 20.

In some possible embodiments of the invention, the transmission mechanism further comprises: oil fill port 70, lubrication passage 80, and oil outlet 90.

The oil filler 70 is provided to the mounting portion 10.

The lubrication passages 80 are provided inside the support shaft 20 and communicate with the oil filler ports 70, respectively.

The plurality of oil outlets 90 are uniformly distributed on the surface of the support shaft 20 corresponding to the transmission part 30 and are communicated with the lubricating channel 80.

Specifically, the present embodiment provides an embodiment of the oil filling port 70, the lubrication passage 80, and the oil outlet 90, and by providing the oil filling port 70, the lubrication passage 80, and the oil outlet 90, the lubrication manner is modified from the conventional splash lubrication to the forced lubrication of the present invention, the lubrication effect is ensured, and the lubrication of the transmission portion 30 and the gear portion 40 is achieved.

In a possible embodiment, lubricating oil is injected from the oil injection port 70 by an oil gun or an oil injection device, and the lubricating oil flows into the inside of the support shaft 20 through the lubricating passage 80 and flows out from the oil outlet 90, so that the transmission portion 30 and the gear portion 40 are lubricated.

In some embodiments of the invention, the present disclosure provides an engine having a transmission as described above.

In some embodiments of the invention, the present disclosure provides a work machine having a transmission as described above, or an engine as described above.

In a possible embodiment, the work machine is a work machine with an engine.

In a possible embodiment, the work machine is an excavator.

In a possible embodiment, the work machine is a crane.

In a possible embodiment, the work machine is a pump truck.

In a possible embodiment, the work machine is a crane.

In a possible embodiment, the work machine is a fire engine.

In a possible embodiment, the work machine is a transport vehicle.

In the description of the embodiments of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "connected" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. Specific meanings of the above terms in the embodiments of the present invention can be understood by those of ordinary skill in the art according to specific situations.

In the description herein, reference to the description of the terms "one embodiment," "some embodiments," "a manner," "a particular manner," or "some manner" or the like, means that a particular feature, structure, material, or characteristic described in connection with the embodiment or manner is included in at least one embodiment or manner of an embodiment of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or mode. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or modes. Furthermore, various embodiments or modes described in this specification, as well as features of various embodiments or modes, may be combined and combined by those skilled in the art without contradiction.

Finally, it should be noted that: the above embodiments are merely illustrative of the present invention and are not to be construed as limiting the invention. Although the present invention has been described in detail with reference to the embodiments, it should be understood by those skilled in the art that various combinations, modifications and equivalents may be made to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention, and the technical solution of the present invention is covered by the claims of the present invention.

Claims

1. A transmission mechanism, comprising: a mounting portion (10), a support shaft (20), a transmission portion (30), and a gear portion (40);

the supporting shaft (20) is connected with the mounting part (10), and the supporting shaft (20) is of a cantilever structure which is perpendicular to the mounting surface of the mounting part (10) along the axial direction;

the transmission part (30) is sleeved outside the support shaft (20);

the gear part (40) is sleeved outside the transmission part (30);

wherein the gear portion (40) includes: a first gear (41) and a second gear (42);

the first gear (41) and the second gear (42) are connected to form a stepped gear along the axial direction of the support shaft (20) from the support shaft (20) toward the mounting portion (10).

2. A transmission mechanism as claimed in claim 1, further comprising: a stopper (50) and a connector (60);

the limiting part (50) is detachably arranged at one side end part of the supporting shaft (20) far away from the mounting part (10) through the connecting piece (60), and abuts against the gear part (40).

3. A transmission according to claim 2, wherein the support shaft (20) is detachably connected to the mounting portion by means of the connecting member (60).

4. A transmission mechanism as claimed in claim 2, characterized in that said transmission portion (30) comprises: a cage (31), a first cage (32), and a rolling element (33);

the plurality of retainers (31) are sleeved on the support shaft (20) at intervals and are inserted into gear holes of the stepped gear;

the first space ring (32) is arranged between two adjacent retainers (31);

the rolling bodies (33) are uniformly distributed on the retainer (31) along the circumferential direction;

wherein the rolling bodies (33) are in linear contact with the support shaft (20) and the stepped gear, respectively.

5. A transmission mechanism according to claim 4, wherein the rolling bodies (33) are cylindrical.

6. A transmission mechanism as claimed in claim 2, characterized in that said transmission portion (30) comprises: a bearing (34) and a second spacer (35);

the bearings (34) are sleeved on the supporting shaft (20) at intervals and inserted into the gear holes of the stepped gear;

the second space ring (35) is arranged between two adjacent bearings (34).

7. A transmission according to any one of claims 1 to 6, characterised in that the first gear wheel (41) and the second gear wheel (42) are of one-piece construction.

8. A transmission mechanism as claimed in any one of claims 1 to 6, further comprising: an oil filling port (70), a lubricating channel (80) and an oil outlet (90);

the oil filling port (70) is arranged on the mounting part (10);

the lubricating channels (80) are arranged inside the supporting shaft (20) and are respectively communicated with the oil filling openings (70);

the oil outlets (90) are uniformly distributed on the surface of the support shaft (20) corresponding to the transmission part (30) and are communicated with the lubricating channel (80).

9. An engine having a transmission according to any one of claims 1 to 8.

10. A working machine having a transmission according to any one of claims 1 to 8 or an engine according to claim 9.