Engine starter with differential mechanism

Abstract

The engine starter provided with the differential mechanism comprises an energy storage shaft and a claw seat, a plurality of starting claws which are distributed around the energy storage shaft and can swing relative to the claw seat are hinged to the claw seat, and the energy storage shaft is sleeved with a plane bearing and a differential disc connected with the plane bearing. Starting parts in one-to-one correspondence with the starting claws are uniformly distributed on the differential disc, the ends of the starting parts extend to the outer wall of the claw seat and are provided with claw outlets, and reset walls abutting against the starting claws during energy storage and starting walls abutting against the starting claws during energy release are arranged on the two sides of the claw outlets; according to the utility model, the differential disc and the plane bearing are arranged, a speed difference is formed between the differential disc and the starting disc by utilizing the plane bearing, and when the energy storage shaft rotates reversely to drive the claw seat to rotate quickly, the starting wall on one side of the claw outlet on the differential disc drives the starting claw to be opened in advance, so that the starting claw is butted with the starting cup quickly; hard impact between the starting claw and the starting cup is prevented, the service life is prolonged, and the device is simple, compact, light in weight, convenient to operate and low in cost.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of engine starting, especially relate to a engine starter with differential mechanism. BACKGROUND

[0002] With the continuous development of economy, the degree of agricultural mechanization is higher and higher, and the agricultural cultivation equipment is more and more widely used. The power source of the agricultural cultivation equipment is basically air-cooled diesel engine. The air-cooled diesel engine must be started by auxiliary starting equipment before work. The auxiliary starting equipment commonly used in the market still adopts the transmission mode of hand starting. The driver uses a crank to drive the starting mechanism on the auxiliary starting equipment to start. The starting mechanism drives the energy storage shaft to rotate to tighten the spring in the auxiliary starting equipment, and then the air-cooled diesel engine is started by the explosive force generated when the spring releases the elastic force to drive the starting cup to high speed.

[0003] At present, the auxiliary starting equipment and the starting cup of the air-cooled diesel engine are connected and separated by a clutch mechanism (which mainly includes a pawl base and a starting pawl). A conventional matching mode of the clutch mechanism and the starting cup is to combine the clutch mechanism and the starting cup directly when the spring releases the elastic force, that is, the pawl base rotates at high speed when the spring releases the elastic force, the starting pawl on the pawl base is thrown out at high speed and hits the starter to make the starting cup rotate at high speed to start the engine. For example, the air-cooled diesel impact-resistant starting mechanism disclosed in patent application No. 201310160572.1. However, the starting pawl has a large force when it is thrown out, which causes hard impact and deformation or even breakage at the contact between the starting pawl and the starting cup, so the service life is not long.

[0004] Another conventional matching mode of the clutch mechanism and the starting cup is to control the spring to release a small amount of elastic force to make the energy storage shaft reverse at a small angle after the spring is tightened, so that the starting pawl can be inserted into the hole in the starting cup or clamped on the side wall of the starting cup in advance, and then the starting cup is rotated at high speed by the complete release of the spring elastic force to realize starting. This matching mode solves the problem of short service life caused by hard impact between the starting pawl and the starting cup, for example, the air-cooled diesel engine starter disclosed in patent application No. 201210450531.1, the air-cooled diesel engine safety starter disclosed in patent application No. 201310048731.9, the air-cooled diesel engine pull-free starter disclosed in patent application No. 201310278516.9, and the manual internal combustion engine starter disclosed in patent application No. 201220611030.2.

[0005] In the matching mode of the clutch mechanism and the starting cup, specifically, the starting claw is opened outward by abutting the outer end of the starting claw with one of the side walls of the claw exit opening when the energy storage shaft is reversely rotated at a small angle, and the starting claw is retracted inward by abutting the outer end of the starting claw with the other side wall of the claw exit opening after the starting is completed. However, since the conventional starting claw is long and flat, in order to enable the starting claw to be opened outward by a large angle, the claw exit opening must be arc-shaped, which results in a large distance between the two side walls of the claw exit opening. Therefore, after the starting claw is retracted inward, the outer end of the starting claw abuts against one side wall of the claw exit opening, and thus the outer end of the starting claw must move along the claw exit opening to abut against the other side wall of the claw exit opening before the starting claw is opened outward. This means that when the energy storage shaft is reversely rotated at a small angle, the starting claw is not immediately opened outward, but there is a period of stagnation due to the movement along the claw exit opening, resulting in a long time or slow speed for the starting claw to switch from the retracted state to the opened state. In order to prevent the elastic force of the scroll spring from being excessively released, the reverse rotation distance of the energy storage shaft in this state is short, and thus the energy storage shaft may have been completely reversed while the starting claw is not completely opened, resulting in that the starting claw and the starting cup cannot be effectively combined.

[0006] Chinese patent 201921916104.1 discloses a starter for an engine, belonging to the technical field of machinery. It solves the problem of short service life of existing auxiliary starters. It includes an energy storage shaft, a claw seat fixed circumferentially on the energy storage shaft, and a friction member capable of generating rotational resistance to the claw seat. The claw seat is hingedly connected with a plurality of starting claws that are distributed around the energy storage shaft and can swing relative to the claw seat. The side of the friction member is provided with a plurality of claw exit openings in the circumferential direction. The outer end of each starting claw is located at the corresponding claw exit opening. The friction member is provided with a starting groove between each two adjacent claw exit openings. The inner end of each starting claw is provided with a starting portion located in the starting groove and protruding radially. The rotation of the energy storage shaft can make the starting portion abut against the groove wall of the starting groove. It has the advantages of long service life, short starting claw opening time, and high success rate of combination with the starting cup. This method of using a friction member, starting claw, and starting groove requires high precision in machining the groove and the starting claw. After wear, the starting claw and the starting groove may not have sufficient machining precision, resulting in a large gap between the starting claw and the starting cup, deformation of the starting claw due to the large force on one or two starting claws, severe wear of the outer wall surface of the spring box, deep scratches, loosening, abnormal noise, and failure of the starting claw to return to the original position. It is also troublesome to install and requires the use of a spring wave ring to control the installation precision. SUMMARY

[0007] The engine starter with the differential mechanism has the advantages that the differential mechanism is arranged, the differential disc and the starting disc are connected through the plane bearing, the starting claw is pre-opened when the claw seat is rapidly rotated under the reverse rotation of the energy storage shaft, the starting claw is quickly connected with the starting cup, the hard impact between the starting claw and the starting cup is prevented, the service life is prolonged, the structure is simple and compact, the weight is light, the operation is convenient, and the cost is low.

[0008] The engine starter with the differential mechanism has the advantages that the differential mechanism is arranged, the differential disc and the starting disc are connected through the plane bearing, the starting claw is pre-opened when the claw seat is rapidly rotated under the reverse rotation of the energy storage shaft, the starting claw is quickly connected with the starting cup, the hard impact between the starting claw and the starting cup is prevented, the service life is prolonged, the structure is simple and compact, the weight is light, the operation is convenient, and the cost is low.

[0009] In work, the energy for driving the energy storage shaft to rotate at high speed is first accumulated, then the starting claw is opened and combined with the starting cup on the engine by reversing the energy storage shaft for a small distance, and finally the accumulated energy is completely released to drive the starting cup to rotate at high speed to realize starting.

[0010] In the above-mentioned auxiliary starter of the engine, the differential disc comprises a disc sleeved on the energy storage shaft and driving blocks evenly arranged at the edge of the disc and arranged perpendicularly to the disc, the starting part is arranged on the driving block, and a separation groove is arranged between adjacent driving blocks.

[0011] In the above-mentioned auxiliary starter of the engine, the plane bearing is arranged as a plane bearing shell and a roller arranged at the bottom of the plane bearing shell.

[0012] In the auxiliary starter of the engine, the planar bearing is arranged as a planar bearing shell I and a rolling ball arranged at the bottom of the planar bearing shell I.

[0013] In the auxiliary starter of the engine, the energy storage shaft is provided with a snap spring groove for mounting the differential disc and the planar bearing.

[0014] In the auxiliary starter of the engine, the claw base comprises a lower claw base and an upper claw base connected with each other, the lower claw base and the upper claw base are provided with square holes fixedly connected with the energy storage shaft, and connecting columns are connected between the lower claw base and the upper claw base near the edges.

[0015] In the auxiliary starter of the engine, the claw base is provided with a plurality of stop portions, and the starting claw is provided with a limiting portion corresponding to the stop portions, so that when the starting claw is reset, the limiting portion can abut against the stop portion to block the tendency of the starting claw to swing inward.

[0016] In the auxiliary starter of the engine, the energy storage shaft is provided with an upper square block and a lower square block matched with the square holes near the end portion, and the energy storage shaft is provided with an abutting portion between the upper square block and the lower square block, so that when the starting claw is opened, the starting claw can abut against the abutting portion to block the tendency of the starting claw to swing outward.

[0017] In the auxiliary starter of the engine, the abutting portion is arranged as a round shaft.

[0018] In the auxiliary starter of the engine, the energy storage shaft is provided with a snap spring I and a wear-resistant gasket for mounting the claw base outside the upper square block.

[0019] The engine starter with the differential mechanism has the advantages that:

[0020] The engine starter with the differential mechanism comprises a differential disc and a planar bearing, the differential disc and the starting disc form a speed difference through the planar bearing, when the claw base is rapidly rotated under the driving of the energy storage shaft, the starting claw is opened in advance through the starting portion on one side of the claw opening of the differential disc, the starting claw is quickly connected with the starting cup, the hard impact of the starting claw on the starting cup is prevented, the service life is prolonged, the structure is simple and compact, the weight is light, the operation is convenient, and the cost is low. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 The engine starter with the differential mechanism is a sectional view;

[0022] Figure 2 The engine starter with the differential mechanism is a top view;

[0023] Figure 3This is a diagram showing the installation state of the starting component, claw seat, and starting claw in the engine starter of this utility model;

[0024] Figure 4 This is an exploded view of the starting component, claw seat, and starting claw in the engine starter of this utility model;

[0025] Figure 5 This is a schematic diagram of the differential disc in the engine starter of this utility model;

[0026] Figure 6 This is a schematic diagram of the claw seat in the engine starter with a differential mechanism according to this utility model.

[0027] Figure 7 This is a schematic diagram of the differential bearing in the engine starter with a differential mechanism according to this utility model.

[0028] Figure 8 This is a schematic diagram of the energy storage shaft in the engine starter with a differential mechanism according to this utility model.

[0029] Reference numerals: 1-Main body; 2-Spring box; 3-Energy storage shaft; 4-Starting shaft; 5-Roll spring; 6-Driving gear; 7-Driven gear; 8-Ratchet; 9-Limit plate; 10-Claw seat; 11-Starting claw; 12-Differential disc; 13-Surface bearing; 14-Snap ring groove; 15-Claw outlet; 16-Chassis; 17-Starting part; 18-Surface bearing housing; 19-Roller; 20-Lower claw seat; 21-Upper claw seat; 22-Connecting column; 23-Stop part; 24-Square hole; 25-Surface bearing housing I; 26-Ball; 27-Starting wall; 28-Reset wall; 29-Disc; 30-Drive block; 31-Separating groove; 32-Lower square block; 33-Upper square block; 34-Abutting part; 35-Snap ring groove I. Detailed Implementation

[0030] The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments.

[0031] like Figures 1-8 The diagram shown is an optical path diagram of an engine starter with a differential mechanism according to the present invention. The engine starter with a differential mechanism according to the present invention includes an energy storage shaft 3 and a claw seat 10 fixed on the energy storage shaft 3. Several starting claws 11 are hinged on the claw seat 10, which are distributed around the energy storage shaft 3 and can swing relative to the claw seat 10. A plane bearing 13 and a differential disk 12 connected to the plane bearing 13 are mounted on the energy storage shaft 3. The differential disk 12 is evenly distributed with starting parts 17 corresponding to the starting claws 11. The end of the starting part 17 extends to the outer wall of the claw seat 10 and is provided with a claw outlet 15. On both sides of the claw outlet 15, there are reset walls 28 that abut against the starting claws 11 when storing energy and starting walls 27 that abut against the starting claws 11 when releasing energy.

[0032] The auxiliary starter of the engine of the embodiment further comprises a body 1, the energy storage shaft 3 is arranged in the body 1 and can rotate, the body 1 comprises a shell with one end opening and the other end closed and a spring box 2 fixed in the shell, a spiral spring 5 is arranged in the spring box 2, one end of the outer side of the spiral spring 5 is fixed on the spring box 2, the energy storage shaft 3 passes through the center of the spiral spring 5, and one end of the inner side of the spiral spring 5 is connected to the energy storage shaft 3; one end of the starting shaft 4 is located in the shell and is connected with a driving gear 6, one end of the energy storage shaft 3 extends out of the spring box 2 and is connected with a driven gear 7, the driving gear 6 is engaged with the driven gear 7; a ratchet wheel 8 is sleeved on one end of the energy storage shaft 3 located outside the shell, a stop piece assembly is hinged outside the shell, the stop piece assembly is partially embedded in the teeth on the outer side of the ratchet wheel 8 to make the ratchet wheel 8 form one-way rotation; a limiting piece 9 is fixed on the starting shaft 4 in the circumferential direction, a limiting head is fixed on the end face of the ratchet wheel 7, a limiting gap is arranged on the outer side of the limiting piece 9, the limiting gap is arc-shaped, and when the limiting head is started, the limiting head abuts against one side wall of the limiting gap to make the limiting piece 9 fixed in the circumferential direction of the ratchet wheel 8, so that the starting shaft 4 is fixed in the circumferential direction of the ratchet wheel 8, and the starting shaft 4 drives the ratchet wheel 8 to rotate against the action of the stop piece assembly; when the elastic force of the spiral spring 5 is tightened, the energy storage shaft 3 drives the starting shaft 4 to rotate in the reverse direction under the release of the elastic force of the spiral spring 5, at this time, the ratchet wheel 7 is clamped by the stop piece assembly and is fixed, and the elastic force of the spiral spring 5 can be released only when the user pulls the stop piece assembly to unlock the ratchet wheel 8, so that the energy storage shaft 3 rotates at high speed.

[0033] The differential disc 12 and the claw base 10 are installed on the other end of the energy storage shaft 3 extending out of the spring box 2, when started, the limiting head abuts against one side wall of the limiting gap to make the limiting piece 9 fixed in the circumferential direction of the ratchet wheel 8, so that the starting shaft 4 is fixed in the circumferential direction of the ratchet wheel 8, and the starting shaft 4 drives the ratchet wheel 8 to rotate against the action of the stop piece assembly; when the elastic force of the spiral spring 5 is tightened, the energy storage shaft 3 drives the starting shaft 4 to rotate in the reverse direction under the release of the elastic force of the spiral spring 5, at this time, the ratchet wheel 7 is clamped by the stop piece assembly and is fixed, and the elastic force of the spiral spring 5 can be released only when the user pulls the stop piece assembly to unlock the ratchet wheel 8, so that the energy storage shaft 3 and the claw base 10 rotate at high speed.

[0034] With the energy storage shaft 3 and the claw base 10 together reverse, the starting claw 11 from the differential disc 12 out of the claw mouth 15 reset wall 28 to the starting wall 27 rotation, before the starting claw 11 and the differential disc 12 on the starting wall 27 contact, at this time the flat bearing 13, the snap spring and the gasket to the differential disc 12 rotation form resistance, the differential disc 12 is limited to rotate, at the moment of starting claw 11 and the differential disc 12 on the starting wall 27 contact, the starting claw 11 driven differential disc 12 starts to rotate, at this time the speed of the differential disc 12 is less than the speed of the starting claw 11, the starting claw 11 is opened outward under the differential resistance of the starting wall 27 and combined with the starting cup; through the starting claw 11 pre-opening and the starting cup combined together, so that the starting claw and the starting cup no longer form a hard contact, the energy storage shaft will drive the claw base and the differential disc to rotate together, the accumulated energy is completely released to drive the starting cup to rotate at high speed to realize starting.

[0035] In the preferred embodiment, the differential disc 12 comprises a disc 29 sleeved on the energy storage shaft and a driving block 30 evenly arranged at the edge of the disc 29 and arranged perpendicularly to the disc 29, and the starting part 17 is arranged on the driving block 30. Adjacent driving blocks 30 are provided with a separation groove 31. In this embodiment, the differential disc 12 can be integrally formed by injection molding or can be machined by a lathe. The driving block 30 can be arranged in an arc shape, which is beneficial to reduce the weight of the differential disc, reduce the starting resistance of the energy accumulator, and facilitate the starting of the engine.

[0036] In the preferred embodiment, the flat bearing 13 is arranged as a flat bearing shell 18 and a roller 19 arranged at the bottom of the flat bearing shell 18. In this embodiment, the flat bearing 13 is used to facilitate the rotation of the differential disc 12 together with the claw base 10, which is beneficial to the differential starting when the starting claw 11 reverses and resets when it rotates forward.

[0037] In the preferred embodiment, the flat bearing 13 is arranged as a flat bearing shell I 25 and a rolling ball 26 arranged at the bottom of the flat bearing shell I 25. In this embodiment, the flat bearing 13 can also use another bearing structure, which can realize differential starting when the starting claw 11 reverses and reset when it rotates forward.

[0038] In the preferred embodiment, the energy storage shaft 3 is provided with a snap spring groove 14 for mounting the differential disc 12 and the flat bearing 13. The snap spring groove 14, the snap spring and the gasket are used to facilitate the mounting of the differential disc 12 and the flat bearing 13 on the energy storage shaft 3.

[0039] Preferably, the claw base 10 comprises a lower claw base 20 and an upper claw base 21 connected to each other, and the lower claw base 20 and the upper claw base 21 are provided with square holes 24 fixedly connected with the energy storage shaft 3, and a connecting column 22 is connected between the lower claw base 20 and the upper claw base 21 near the edge, and the starting claw 11 is hinged on the connecting column 22, and the lower claw base 20, the upper claw base 21 and the starting claw 11 can all adopt a plate structure punched and formed by a hard steel plate, the lower claw base 20 and the upper claw base 21 are provided with a thickness of 5 mm, and the connecting column 22 adopts a rivet structure, and the lower claw base 20, the upper claw base 21 and the starting claw 11 are installed and connected into a whole by the rivet 22.

[0040] Preferably, a plurality of stop portions 23 are arranged in the claw base, and a limiting portion is correspondingly arranged on the starting claw 11, and when the starting claw is reset, the limiting portion can abut against the stop portion 23 to block the tendency of the starting claw 11 to swing inward, and the limiting portion is arranged on the other side of the starting claw 11 away from the claw opening, wherein the stop portion 23 is formed by one-time processing with the lower claw base 20 or the upper claw base 21, the stop portion 23 is block-shaped and located on the swinging path of the starting claw 11 away from the center of the claw base 10, after the starting claw 11 swings away from the center of the claw base 10, the outer side of the starting claw 11 abuts against the stop portion 23 so that the starting claw 11 cannot continue to swing inward, and through the arrangement of the stop portion 23, the starting claw 11 can be kept at the current swinging angle after being reset, so as to ensure the stable cooperation between the starting claw and the starting cup.

[0041] Preferably, the energy storage shaft 3 is provided with an upper square block 33 and a lower square block 32 near the end portion, the energy storage shaft 3 is provided with an abutting portion 34 between the upper square block 33 and the lower square block 32, and when the starting claw 11 is opened, the starting claw 11 can abut against the abutting portion 34 to block the tendency of the starting claw 11 to swing outward, and in the embodiment, the abutting portion 34 is located on the swinging path of the starting claw 11 towards the center of the claw base 10, after the starting claw 11 swings towards the center of the claw base 10, the abutting portion 34 abuts against the inner side of the starting claw 11 to make the starting claw 11 unable to continue to swing outward, and through the arrangement of the abutting portion 34, the starting claw 11 can be kept at the current swinging angle after being quickly opened, so as to ensure the stable cooperation between the starting claw 11 and the starting cup.

[0042] Preferably, the abutting portion 34 is a round shaft, and in the embodiment, the abutting portion 34 adopts a round shaft structure, which is convenient for multiple starting claws to abut against the outer circumference of the round shaft at the same time, ensures the stable cooperation between multiple starting claws 11 and the starting cup at the same time, and improves the starting efficiency of the starter.

[0043] In the preferred embodiment, the energy storage shaft 3 is provided with a snap spring I and a wear-resistant gasket of the mounting claw base 10 outside the upper square block 33. In this embodiment, the snap spring I is clamped in the snap spring groove I 35, which facilitates the fixing and installation of the claw base 10 and the wear-resistant gasket together on the energy storage shaft 3.

[0044] Finally, it should be pointed out that the above embodiments are only used to illustrate the technical solutions of the present application and are not limiting. Although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present application can be modified or replaced by equivalents without departing from the spirit and scope of the present application. The modifications and equivalents should be included in the scope of the claims of the present application.

Claims

1. An engine starter with a differential mechanism, comprising an accumulator shaft (3) and a pawl carrier (10) fixed to the accumulator shaft (3), a plurality of starting pawls (11) being hinged to the pawl carrier (10) and being able to oscillate relative to the pawl carrier (10) about the accumulator shaft (3), characterized in that: The energy storage shaft (3) is sleeved with a plane bearing (13) and a differential disc (12) connected with the plane bearing (13), the differential disc (12) is uniformly provided with a starting part (17) corresponding to the starting claw (11), the end of the starting part (17) extends to the outer wall of the claw seat (10) and is provided with an ejection claw opening (15), and the two sides of the ejection claw opening (15) are provided with a reset wall (28) abutting against the starting claw (11) during energy storage and a starting wall (27) abutting against the starting claw (11) during energy release.

2. An engine starter having a differential mechanism as recited in claim 1, wherein: The differential disc (12) comprises a disc (29) sleeved on the energy storage shaft and a driving block (30) uniformly arranged at the edge of the disc (29) and arranged perpendicularly to the disc (29), and the starting part (17) is arranged on the driving block (30), and a separation groove (31) is arranged between adjacent driving blocks (30).

3. An engine starter having a differential mechanism as recited in claim 1, wherein: The plane bearing (13) is arranged as a plane bearing shell (18) and a roller (19) arranged at the bottom of the plane bearing shell (18).

4. An engine starter having a differential mechanism as recited in claim 1, wherein: The plane bearing (13) is arranged as a plane bearing shell I (25) and a rolling ball (26) arranged at the bottom of the plane bearing shell I (25).

5. An engine starter having a differential mechanism as recited in claim 1 wherein: The energy storage shaft (3) is provided with a snap spring groove (14) for mounting the differential disc (12) and the plane bearing (13).

6. An engine starter having a differential mechanism as recited in claim 1 wherein: The claw seat (10) comprises a lower claw seat (20) and an upper claw seat (21) connected with each other, the lower claw seat (20) and the upper claw seat (21) are provided with a square hole (24) fixedly connected with the energy storage shaft (3), and the lower claw seat (20) and the upper claw seat (21) are connected with a connecting column (22) near the edge.

7. An engine starter having a differential mechanism as claimed in claim 6, characterised in that: A plurality of stop parts (23) are arranged in the claw seat, and a limiting part is correspondingly arranged on the starting claw (11), so that when the starting claw is reset, the limiting part can abut against the stop part (23) to block the tendency of the starting claw (11) to swing inward.

8. An engine starter having a differential mechanism as recited in claim 7, wherein: The energy storage shaft (3) is provided with an upper square block (33) and a lower square block (32) adapted to the square hole (24) near the end, and the energy storage shaft (3) is provided with an abutting part (34) between the upper square block (33) and the lower square block (32), so that when the starting claw (11) is opened, the starting claw (11) can abut against the abutting part (34) to block the tendency of the starting claw (11) to swing outward.

9. An engine starter having a differential mechanism as claimed in claim 8, characterised in that: The abutting part (34) is arranged as a circular shaft.

10. An engine starter having a differential mechanism as recited in claim 8, wherein: The energy storage shaft (3) is provided with a snap spring I and a wear-resistant gasket for mounting the claw seat (10) outside the upper square block (33).

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