Engine

Abstract

The utility model provides an engine which comprises an engine body, a gear chamber, a gear chamber cover and a cam shaft gear, the gear chamber is fixed on one side of the engine body, the gear chamber cover is fixedly connected with the gear chamber, an installation cavity is arranged in the gear chamber cover, a supporting bearing is arranged in the installation cavity, and a cam shaft is arranged in the engine body in a penetrating mode and connected with the engine body in a rotating mode through a lining. The cam shaft comprises a driving end located in a cavity defined by the gear chamber and the gear chamber cover, the driving end of the cam shaft is supported in an inner ring of the supporting bearing, and the cam shaft gear is installed at the driving end of the cam shaft and located between the machine body and the supporting bearing. The supporting bearing is arranged in the gear chamber cover, and the driving end of the cam shaft gear is supported on the gear chamber cover through the supporting bearing, so that the two sides of the cam shaft gear are supported, and radial force borne by the cam shaft gear is transmitted to the bushing of the cam shaft and the gear chamber cover at the same time; and the bearing capacity borne by the bushing and the bending moment of the driving end of the cam shaft are greatly reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of engines, in particular to an engine with improved camshaft load-bearing capacity. Background Art

[0002] In applications supporting construction and agricultural machinery, camshaft drive gears are often used as drive gears for power outputs such as hydraulic pumps. Typical camshaft drive gears are cantilever structures supported on one side. With the rapid development and widespread application of hydraulic components in China, more and more construction and agricultural machinery use hydraulically driven components, necessitating the use of hydraulic pumps with increasingly larger displacements and pressures. Consequently, the hydraulic pump's drive power also increases, resulting in increased radial forces on the camshaft gears, and in turn, increasing loads on the cantilever-supported, single-sided camshaft bushings. If the bending moment on the camshaft drive end exceeds the camshaft bushing's load-bearing capacity or if the bushing is unevenly stressed, bushing wear will be exacerbated, leading to serious failures such as camshaft bushing burnout or even camshaft fracture.

[0003] Therefore, it is necessary to provide an engine to overcome the above-mentioned defects. Utility Model Content

[0004] The purpose of the utility model is to provide an engine.

[0005] According to one aspect of the present invention, an engine is provided, comprising:

[0006] body,

[0007] a gear chamber, the gear chamber being fixed to one side of the machine body;

[0008] A gear chamber cover, the gear chamber cover is fixedly connected to the gear chamber, a mounting cavity is provided in the gear chamber cover, and a support bearing is provided in the mounting cavity;

[0009] a camshaft, the camshaft being disposed within the engine body and being rotatably connected to the engine body via a bushing, the camshaft including a driving end located within a cavity defined by the gear chamber and the gear chamber cover, and the driving end of the camshaft being supported by an inner ring of a support bearing;

[0010] A camshaft gear is mounted on the drive end of the camshaft and is located between the engine block and the support bearing.

[0011] Preferably, the mounting cavity is surrounded by an annular platform extending axially inward from the inner end surface of the gear chamber cover, the outer ring of the support bearing is supported on the inner wall of the annular platform, and the inner ring of the support bearing is sleeved on the driving end of the camshaft.

[0012] Preferably, the driving end of the camshaft is provided with a limit plate, a locking bolt is inserted into the limit plate, and the locking bolt is screwed into the driving end, and the limit plate abuts against the inner ring of the support bearing.

[0013] Preferably, the camshaft includes a journal for supporting a bushing, the journal is provided with a step portion close to the driving end, a retaining ring is sleeved on the step portion, the retaining ring is provided between the bushing and the camshaft gear, and is tightened by the camshaft gear.

[0014] Preferably, the projection of the retaining ring on the machine body partially overlaps with the machine body, the bushing and the journal.

[0015] Preferably, a gear keyway is provided on the inner periphery of the camshaft gear, and a mounting keyway is provided on the driving end of the camshaft. The gear keyway and the mounting keyway are arranged correspondingly and located on the outer periphery of the mounting keyway, and flat keys are provided in the gear keyway and the mounting keyway.

[0016] Compared with the prior art, the engine provided by the present invention has the following beneficial effects:

[0017] Due to the adoption of the above-mentioned technical solution, the utility model has the advantages of simple structure, ingenious design and low cost. By arranging a support bearing in the gear chamber cover, the driving end of the camshaft gear is supported on the gear chamber cover through the support bearing, so that both sides of the camshaft gear are supported. The radial force borne by the camshaft gear will be transmitted to the bushing of the camshaft and the gear chamber cover at the same time, which greatly reduces the bearing capacity of the bushing and the bending moment of the camshaft driving end, and avoids the bearing capacity of the bushing exceeding the limit or the bushing burning due to uneven force, or even the camshaft breaking. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0019] Figure 1 This is a front view of the engine of the present utility model;

[0020] Figure 2 for Figure 1 The cross-sectional view of the AA surface;

[0021] Figure 3 for Figure 2 A magnified view of point A;

[0022] Figure 4 A three-dimensional diagram of the gear chamber cover of the present invention;

[0023] Figure 5 It is a partial exploded view of the utility model.

[0024] Among them, 1. Body, 2. Gear chamber, 3. Gear chamber cover, 31. Mounting cavity, 32. Ring platform, 4. Camshaft, 41. Drive end, 411 Threaded connection hole, 412 Mounting keyway, 42. Shaft neck, 421. Step, 43. Bushing, 44. Limit plate, 45. Retaining ring, 5. Camshaft gear, 51. Gear keyway, 6. Support bearing, 7. Locking bolt, 8. Flat key. DETAILED DESCRIPTION

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0026] To simplify the drawings, only the parts relevant to the present invention are schematically shown in each figure. They do not represent the actual structure of the product. In addition, to simplify the drawings and facilitate understanding, in some figures, only one of the components with the same structure or function is schematically depicted or labeled. In this document, "one" not only means "only one" but also "more than one."

[0027] It should be further understood that the term "and / or" used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.

[0028] It should be noted that, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they can refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.

[0029] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without inventive work.

[0031] See also Figure 1 This embodiment discloses an engine, comprising an engine body 1, a gear chamber 2, a gear chamber cover 3, a camshaft 4, and a camshaft gear 5. The gear chamber 2 is fixed to one side of the engine body 1, and the gear chamber cover 3 is fixedly connected to the gear chamber 2. The camshaft 4 is disposed within the engine body 1 and is rotationally connected to the engine body 1 via a bushing 43. The drive end 41 of the camshaft 4 is located within the cavity enclosed by the gear chamber 2 and the gear chamber cover 3.

[0032] The gear cover 3 defines a mounting cavity 31, within which a support bearing 6 is housed. The mounting cavity 31 is enclosed by an annular platform 32 extending axially inward from the inner end surface of the gear cover 3. The outer ring of the support bearing 6 is supported on the inner wall of the annular platform 32, while the inner ring of the support bearing 6 is sleeved onto the drive end 41 of the camshaft 4. The camshaft gear 5 is mounted on the drive end 41 of the camshaft 4 and is located between the engine body 1 and the support bearing 6.

[0033] The camshaft 4 includes a journal 42 for supporting a bushing 43. A step 421 is provided on the journal 42 near the drive end 41. A retaining ring 45 is mounted on the step 421. The retaining ring 45 is positioned between the bushing 43 and the camshaft gear 5 and is compressed by the camshaft gear 5. The projection of the retaining ring 45 on the engine body 1 partially overlaps with the engine body 1, the bushing 43, and the journal 42.

[0034] The driving end 41 of the camshaft 4 is provided with a stopper plate 44, into which a locking bolt 7 is inserted and screwed. The stopper plate 44 abuts against the inner race of the support bearing 6. A threaded hole 411 is axially defined in the driving end 41 of the camshaft 4. A through-hole is defined in the center of the stopper plate 44, through which the threaded end of the locking bolt 7 passes to connect with the threaded hole 411. The head of the locking bolt 7 abuts against the stopper plate 44, pressing the stopper plate 44 against the side of the support bearing 6. This, in turn, presses the support bearing 6 against the side of the camshaft gear 5, pressing the camshaft gear 5 against the sidewall of the journal 42.

[0035] The driving end 41 located on the right side of the camshaft gear 5 is supported on the gear chamber cover 3 through the support bearing 6, and the journal 42 located on the left side of the camshaft gear 5 is supported on the body 1 through the bushing 43, so that both sides of the camshaft gear 5 are supported and subjected to force at the same time, thereby solving the cantilever structure problem of the unilateral support of the driving end 41 of the camshaft 4. At the same time, it increases the output driving torque that the camshaft 4 can withstand and protects the bushing 43.

[0036] The camshaft gear 5 has a gear keyway 51 defined on its inner circumference, while the drive end 41 of the camshaft 4 has a mounting keyway 412 defined on its inner circumference. The gear keyway 51 corresponds to and is located outside the mounting keyway 412. Flat keys 8 are located in the gear keyway 51 and mounting keyway 412, securing the camshaft 4 and camshaft gear 5 radially. The provision of flat keys 8 effectively prevents slippage between the camshaft 4 and camshaft gear 5, improving the reliability of the connection between the two gears.

[0037] It will be apparent to those skilled in the art that various modifications and variations can be made to the exemplary embodiments described above without departing from the spirit and scope of the present invention. Therefore, it is intended that the present invention cover modifications and variations of the present invention that fall within the scope of the appended claims and their equivalents.

Claims

1. An engine, characterized in that: include: body, a gear chamber, the gear chamber being fixed to one side of the machine body; A gear chamber cover, the gear chamber cover is fixedly connected to the gear chamber, a mounting cavity is provided in the gear chamber cover, and a support bearing is provided in the mounting cavity; a camshaft, the camshaft being disposed within the engine body and being rotatably connected to the engine body via a bushing, the camshaft including a driving end located within a cavity defined by the gear chamber and the gear chamber cover, and the driving end of the camshaft being directly supported by an inner ring of a support bearing; A camshaft gear is mounted on the drive end of the camshaft and is located between the engine block and the support bearing.

2. The engine according to claim 1, wherein: The mounting cavity is surrounded by a ring platform extending axially inward from the inner end surface of the gear chamber cover. The outer ring of the support bearing is supported on the inner wall of the ring platform, and the inner ring of the support bearing is sleeved on the driving end of the camshaft.

3. The engine according to claim 2, wherein: The driving end of the camshaft is provided with a limit plate, a locking bolt is inserted into the limit plate, and the locking bolt is screwed into the driving end, and the limit plate abuts against the inner ring of the support bearing.

4. The engine according to claim 3, wherein: The camshaft includes a journal for supporting a bushing, a step portion is provided on the journal near the driving end, a retaining ring is sleeved on the step portion, and the retaining ring is provided between the bushing and the camshaft gear and is tightened by the camshaft gear.

5. The engine according to claim 4, characterized in that The projection of the retaining ring on the machine body partially overlaps with the machine body, the bushing and the journal.

6. The engine according to claim 5, characterized in that A gear keyway is provided on the inner periphery of the camshaft gear, and a mounting keyway is provided on the driving end of the camshaft. The gear keyway and the mounting keyway are arranged correspondingly and located on the outer periphery of the mounting keyway, and flat keys are provided in the gear keyway and the mounting keyway.

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