Snowmobile gear box

Abstract

The utility model provides a gearbox of a snowmobile, and belongs to the technical field of machinery. The gearbox solves the problem that an existing gearbox is complex in structure. The snowmobile gear box comprises a box body, an input shaft and an output shaft, the input shaft and the output shaft are horizontally arranged in the box body in a left-right parallel mode, the front end of the input shaft and the rear end of the output shaft both extend out of the box body, and the rear end of the input shaft is sleeved with a main gear and connected with the main gear through a spline in a matched mode. A shifting fork mechanism used for pushing the main gear to slide front and back is further arranged on the box body, a main chain wheel is further rotationally arranged outside the rear end of the input shaft, a circle of protruding claws are formed on the front end face of the main gear, a circle of arc grooves are formed in the rear end face of the main chain wheel, and the number of the arc grooves is the same as that of the protruding claws. The front end of the output shaft is sleeved and fixed with an auxiliary chain wheel and an auxiliary gear, the main chain wheel and the auxiliary chain wheel are connected through a chain, and the main gear slides to enable the main gear to be meshed with the auxiliary gear or enable each convex claw to stretch into the corresponding arc groove. The gearbox of the snowmobile is simple in structure.

Description

Technical Field

[0001] The utility model belongs to the technical field of machinery and relates to a snowmobile, in particular to a snowmobile gear box. Background Art

[0002] A gearbox is a closed gear train that usually exists as a mechanical unit or assembly, consisting of a series of integrated gears, clutch shafts, countershafts, main shafts, bearings and other components.

[0003] Existing vehicle gearboxes, such as a rear-rotation transmission box assembly with forward and reverse output disclosed in the Chinese Patent Library (application number: 201721477316.5), include a box body, an input shaft, a transmission shaft and an output shaft, one end of the input shaft extends into the box body and is connected to a driving bevel gear; the transmission shaft is located at the upper end of the box body and is rotatably connected to the box body, and a driven bevel gear is provided on the transmission shaft, which is meshed with the driving bevel gear; the output shaft is located at the lower end of the box body, parallel to the transmission shaft, and is rotatably connected to the box body, and its two ends extend from both sides of the box body; a reverse gear shaft is also provided in the box body, which is rotatably connected to the box body and parallel to the transmission shaft; a transmission main gear and a reverse gear driving sprocket are provided on the transmission shaft, and the reverse gear driving sprocket is sleeved on the transmission shaft and can rotate freely; the transmission main gear is located between the driven bevel gear and the reverse gear driving sprocket, and is connected to the transmission shaft through a spline for sliding fit; a shift fork is provided on one side of the transmission main gear, which is engaged with the transmission main gear on the transmission main gear The shift fork should be provided with a shift fork groove, one end of the shift fork is inserted into the shift fork groove, and the other end is connected to a shift fork shaft parallel to the transmission shaft, and the transmission main gear can be driven to move along the axial direction of the transmission shaft through the shift fork shaft and the shift fork; a plurality of claws are provided on the side of the transmission main gear close to the reverse gear driving sprocket, and a groove is provided corresponding to the claw on the side of the reverse gear driving sprocket close to the transmission main gear; when the transmission main gear moves toward the reverse gear driving sprocket, the claw on the transmission main gear can be inserted into the groove on the reverse gear driving sprocket, And drive the reverse gear driving sprocket to rotate synchronously; a transmission sub-gear, a reverse gear driven sprocket and an output driving sprocket are sleeved on the reverse gear shaft, and the transmission sub-gear, the reverse gear driven sprocket and the output driving sprocket are all connected to the reverse gear shaft through splines, wherein the transmission sub-gear is meshed with the transmission main gear, and the reverse gear driven sprocket is connected to the reverse gear driving sprocket through a transmission chain; an output driven sprocket is sleeved on the output shaft, and the output driven sprocket is fixedly connected to the output shaft, and is connected to the output driving chain through a transmission chain.

[0004] The above transmission box assembly needs to be provided with a reverse gear shaft between the transmission shaft and the output shaft, and chain transmission pairs are provided between the reverse gear shaft and the transmission shaft and between the reverse gear shaft and the output shaft, which makes the whole structure more complicated and affects the transmission stability. Utility Model Content

[0005] The utility model aims to solve the above problems in the prior art and proposes a snowmobile gear box with simple structure and stable transmission.

[0006] The purpose of the utility model can be achieved through the following technical solutions: a snowmobile gear box, comprising a box body and an input shaft and an output shaft both horizontally arranged in the box body, the input shaft and the output shaft are arranged side by side on the left and right, and the front end of the input shaft and the rear end of the output shaft both extend out of the box body, the rear end of the input shaft is sleeved with a main gear and the two are connected by spline matching, and the box body is also provided with a fork mechanism for pushing the main gear to slide back and forth, characterized in that a main sprocket is also rotatably arranged outside the rear end of the input shaft, and the main sprocket and the input shaft are coaxially arranged; a circle of cams is formed on the front end surface of the main gear, and a circle of arc grooves matching with the cams is provided on the rear end surface of the main sprocket, and the number of the arc grooves and the cams is the same; a secondary sprocket and a secondary gear matching with the main gear are sleeved and fixed on the front end of the output shaft, and the secondary gear is on the rear side of the secondary sprocket; the main sprocket and the secondary sprocket are connected by a chain, and sliding the main gear can make it mesh with the secondary gear or make each cam extend into the corresponding arc groove.

[0007] The use process is as follows: the main gear moves forward, the cam extends into the arc groove to connect the main gear with the main sprocket circumferentially, so as to drive the output shaft to output power in the positive direction through the chain; the main gear moves backward and meshes with the sub-gear to drive the output shaft to output power in the reverse direction.

[0008] The gearbox only needs to be provided with an input shaft and an output shaft arranged in parallel on the left and right, and the input shaft and the output shaft are switched back and forth between a set of chain transmission pairs and a set of gear pairs through a fork mechanism. Under the premise of realizing the forward and reverse rotation of the output shaft, the investment in parts can be effectively reduced, and it has the advantages of simple structure and stable operation.

[0009] In the above-mentioned snowmobile gearbox, a stopper is also provided on the input shaft to limit the main gear from moving backward when the main gear and the pinion are meshed. Under the action of the stopper, the main gear can be prevented from moving backward further and separating from the pinion, ensuring stable operation of the gearbox.

[0010] In the above-mentioned snowmobile gearbox, the limiting member is a limiting sleeve sleeved on the input shaft, the main gear is located between the limiting sleeve and the main sprocket, and the rear end face of the main gear can be pressed on the front end face of the limiting sleeve; an annular member is also fixed on the input shaft, and the rear end face of the limiting sleeve can be pressed on the front end face of the annular member to limit the backward movement of the annular member, so that the annular member can stably support the main gear forward.

[0011] In the above-mentioned snowmobile gearbox, the rear end of the input shaft is rotatably arranged in the box body through the rear bearing, and the annular member is located between the limit sleeve and the rear bearing; the rear bearing includes an outer ring fixedly connected to the box body and an inner ring fixedly connected to the input shaft, and an annular positioning groove is opened on the input shaft, and a shaft retaining ring is installed in the positioning groove, and the shaft retaining ring is pressed on the front end surface of the inner ring, which is used for axial limiting of the rear bearing to ensure smooth rotation of the input shaft.

[0012] In the above-mentioned snowmobile gearbox, the annular part is the above-mentioned shaft retaining ring, so that when the main gear and the auxiliary gear are engaged, the limit sleeve is clamped between the shaft retaining ring and the main gear, so that the limit sleeve, the main gear and the inner ring of the rear bearing rotate synchronously, effectively reducing the relative wear of the above three. This not only effectively extends the service life, but also enhances the operating stability of the gearbox.

[0013] In the above-mentioned snowmobile gearbox, the input shaft has an annular shoulder surface, and an annular mounting groove for placing the limit sleeve is formed between the shoulder surface and the shaft retaining ring, and the axial length of the mounting groove is greater than the axial length of the limit sleeve. The shoulder surface is provided to limit the forward movement distance of the limit sleeve without affecting the movement of the limit sleeve following the main gear, thereby preventing the limit sleeve from moving forward and colliding with the main gear when the output shaft rotates in the forward direction, and further ensuring the stable operation of the gearbox.

[0014] As another solution, in the above-mentioned snowmobile gearbox, the annular member is an annular limit seat integrally formed on the rear end of the input shaft.

[0015] As another solution, in the above-mentioned snowmobile gearbox, the limiter is a spring sleeved on the input shaft, an annular positioning seat is formed on the input shaft, and the front and rear ends of the spring can be pressed on the main gear and the positioning seat respectively.

[0016] Compared with the prior art, this snowmobile gearbox has the following advantages:

[0017] 1. This gearbox only needs to set up the input shaft and output shaft in parallel on the left and right, and use the fork mechanism to switch the input shaft and the output shaft back and forth between a group of chain transmission pairs and a group of gear pairs. Under the premise of realizing the forward and reverse rotation of the output shaft, it can effectively reduce the investment in parts and components, and has the advantages of simple structure and stable operation.

[0018] 2. When the main gear and the secondary gear are meshing, the limit sleeve is clamped between the shaft retaining ring and the main gear, so that the limit sleeve, the main gear and the inner ring of the rear bearing rotate synchronously, effectively reducing the relative wear of the above three. This not only effectively extends the service life, but also enhances the operating stability of the gearbox. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a three-dimensional schematic diagram of a snowmobile gearbox.

[0020] Figure 2 It is a three-dimensional diagram of the inside of a snowmobile gearbox.

[0021] Figure 3 It is a connection diagram of the input shaft and the main gear.

[0022] Figure 4 yes Figure 3A magnified schematic diagram of center A.

[0023] In the figure, 1, housing; 2, input shaft; 2a, shaft shoulder surface; 3, output shaft; 4, main gear; 4a, cam; 5, fork mechanism; 6, main sprocket; 6a, arc groove; 7, secondary gear; 8, secondary sprocket; 9, chain; 10, limit sleeve; 11, shaft retaining ring 11; 12, shaft sleeve; 13, rear bearing. DETAILED DESCRIPTION

[0024] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments. Embodiment 1

[0025] like Figure 1 and Figure 2 As shown, the snowmobile gearbox includes a housing 1 and an input shaft 2 and an output shaft 3 both horizontally arranged in the housing 1. The axes of the input shaft 2 and the output shaft 3 extend forward and backward, the input shaft 2 and the output shaft 3 are arranged side by side left and right, and the front end of the input shaft 2 and the rear end of the output shaft 3 both extend out of the housing 1. In actual products, the front end of the input shaft 2 and the rear end of the output shaft 3 are sealed with the housing 1 by an annular oil seal.

[0026] in,

[0027] A main gear 4 is sleeved on the rear end of the input shaft 2 and the two are connected by spline cooperation; a fork mechanism 5 for pushing the main gear 4 to slide back and forth is also provided on the housing 1. The fork mechanism 5 is an existing structure. For details, please refer to a coaxial reverse gear box for a three-wheeled motorcycle disclosed in the Chinese Patent Library (application number: CN01214013.9), which will not be elaborated here.

[0028] like Figure 2 and Figure 3 As shown, a main sprocket 6 is also rotatably arranged outside the rear end of the input shaft 2, and the main sprocket 6 and the input shaft 2 are arranged coaxially. A circle of protruding claws 4a are formed on the front end surface of the main gear 4, and a circle of arc grooves 6a that match the protruding claws 4a are arranged on the rear end surface of the main sprocket 6, and the number of the arc grooves 6a and the protruding claws 4a are the same. A secondary sprocket 8 and a secondary gear 7 that matches the main gear 4 are sleeved and fixed on the front end of the output shaft 3, and the secondary gear 7 is on the rear side of the secondary sprocket 8; the main sprocket 6 and the secondary sprocket 8 are arranged in parallel and connected by a chain 9, and the sliding main gear 4 can make the main gear 4 mesh with the secondary gear 7 or make each protruding claw 4a extend into the corresponding arc groove 6a.

[0029] The use process is as follows: the main gear 4 moves forward, and the pawl 4a extends into the arc groove 6a to connect the main gear 4 with the main sprocket 6 circumferentially, so as to drive the output shaft 3 to output power in the positive direction through the chain 9; the main gear 4 moves backward and meshes with the sub-gear 7 to drive the output shaft 3 to output power in the reverse direction.

[0030] The gearbox only needs to be provided with an input shaft 2 and an output shaft 3 which are arranged in parallel on the left and right sides, and the input shaft 2 and the output shaft 3 are switched back and forth between a group of chain transmission pairs and a group of gear pairs through a fork mechanism 5. On the premise of realizing the forward and reverse rotation of the output shaft 3, the investment in parts can be effectively reduced, and it has the advantages of simple structure and stable operation.

[0031] Further explanation, a stopper is provided on the input shaft 2 to limit the main gear 4 from moving backward when the main gear 4 is meshed with the auxiliary gear 7. Under the action of the stopper, the main gear 4 can be prevented from moving backward further and separating from the auxiliary gear 7, ensuring stable operation of the gearbox.

[0032] In this embodiment,

[0033] The limiting member is a limiting sleeve 10 sleeved on the input shaft 2, the main gear 4 is between the limiting sleeve 10 and the main sprocket 6, and the rear end face of the main gear 4 can be pressed on the front end face of the limiting sleeve 10; an annular member is also fixed on the input shaft 2, and the rear end face of the limiting sleeve 10 can be pressed on the front end face of the annular member to limit the backward movement of the annular member, so that the annular member can stably support the main gear 4 forward.

[0034] In the actual product, the output shaft 3 is rotatably arranged in the housing 1 through a ball bearing, there are two rolling bearings, and the secondary sprocket 8 and the secondary gear 7 are both located between the two rolling bearings. The input shaft 2 is rotatably arranged in the housing 1 through the front bearing and the rear bearing 13, and the main sprocket 6 and the main gear 4 are both located between the front bearing and the rear bearing 13.

[0035] Among them, Figure 1 As shown, the annular member is located between the limiting sleeve 10 and the rear bearing 13; the rear bearing 13 includes an outer ring fixedly connected to the housing 1 and an inner ring fixedly connected to the input shaft 2. An annular positioning groove is provided on the input shaft 2, and a shaft retaining ring is installed in the positioning groove. The shaft retaining ring is pressed on the front end surface of the inner ring and is used for axial limiting of the rear bearing 13 to ensure smooth rotation of the input shaft 2.

[0036] like Figure 3 and Figure 4As shown, the annular member is the above-mentioned shaft retaining ring, so that when the main gear 4 and the secondary gear 7 are meshed, the limiting sleeve 10 is clamped between the shaft retaining ring and the main gear 4, so that the limiting sleeve 10, the main gear 4 and the inner ring of the rear bearing 13 rotate synchronously, effectively reducing the relative wear of the above three, which not only effectively prolongs the service life, but also enhances the operation stability of the gearbox. Further explanation, the input shaft 2 has an annular shoulder surface 2a, and the shoulder surface 2a is located at the front side of the limiting sleeve 10. An annular mounting groove for placing the limiting sleeve 10 is formed between the shoulder surface 2a and the shaft retaining ring, and the axial length of the mounting groove is greater than the axial length of the limiting sleeve 10. The shoulder surface 2a is set, and the limit sleeve 10 moves forward without affecting the movement of the limit sleeve 10 following the main gear 4, so as to prevent the limit sleeve 10 from moving forward and colliding with the main gear 4 when the output shaft 3 rotates in the forward direction, and further ensure the stable operation of the gearbox.

[0037] The main sprocket 6 is installed as follows: positioning retaining rings are installed at both ends of the input shaft 2, and the main sprocket 6 is located between the two positioning retaining rings. One retaining ring is pressed on the rear end of the main sprocket 6, and the front end of the main sprocket 6 is pressed on the other retaining ring through the shaft sleeve 12, so that the main sprocket 6 and the input shaft 2 are axially limited and circumferentially rotated, ensuring the smooth operation of the main sprocket 6. Embodiment 2

[0038] The structure and principle of the second embodiment are basically the same as those of the first embodiment, except that the annular member is an annular limit seat integrally formed on the rear end of the input shaft 2 . Embodiment 3

[0039] The structure and principle of the third embodiment are basically the same as those of the first embodiment, except that the limiting member is a spring sleeved on the input shaft 2, an annular positioning seat is formed on the input shaft 2, and the front and rear ends of the spring can be pressed on the main gear 4 and the positioning seat respectively.

[0040] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A snowmobile gearbox, comprising a housing (1) and an input shaft (2) and an output shaft (3) both of which are horizontally arranged in the housing (1), wherein the input shaft (2) and the output shaft (3) are arranged side by side, and the front end of the input shaft (2) and the rear end of the output shaft (3) both extend out of the housing (1), the rear end of the input shaft (2) is sleeved with a main gear (4) and the two are connected by spline matching, and the housing (1) is also provided with a fork mechanism (5) for pushing the main gear (4) to slide forward and backward, characterized in that: A main sprocket (6) is rotatably arranged outside the rear end of the input shaft (2), and the main sprocket (6) and the input shaft (2) are coaxially arranged; a circle of protruding claws (4a) are formed on the front end surface of the main gear (4), and a circle of arc grooves (6a) cooperating with the protruding claws (4a) are arranged on the rear end surface of the main sprocket (6), and the number of the arc grooves (6a) and the number of the protruding claws (4a) are the same; a secondary sprocket (8) and a secondary gear (7) cooperating with the main gear (4) are sleeved and fixed on the front end of the output shaft (3), and the secondary gear (7) is on the rear side of the secondary sprocket (8); the main sprocket (6) and the secondary sprocket (8) are connected by a chain (9), and the sliding of the main gear (4) can make it mesh with the secondary gear (7) or make each protruding claw (4a) extend into the corresponding arc groove (6a).

2. The snowmobile gearbox according to claim 1, characterized in that: The input shaft (2) is also provided with a limiting member for limiting the main gear (4) from moving backward when the main gear (4) and the auxiliary gear (7) are meshed.

3. The snowmobile gear box according to claim 2, characterized in that: The limiting member is a limiting sleeve (10) sleeved on the input shaft (2); the main gear (4) is located between the limiting sleeve (10) and the main sprocket (6), and the rear end surface of the main gear (4) can be pressed on the front end surface of the limiting sleeve (10); an annular member is also fixed on the input shaft (2), and the rear end surface of the limiting sleeve (10) can be pressed on the front end surface of the annular member.

4. The snowmobile gearbox according to claim 3, characterized in that: The rear end of the input shaft (2) is rotatably arranged in the housing (1) via a rear bearing (13), and the annular member is located between the limiting sleeve (10) and the rear bearing (13); the rear bearing (13) comprises an outer ring fixedly connected to the housing (1) and an inner ring fixedly connected to the input shaft (2); an annular positioning groove is provided on the input shaft (2), a shaft retaining ring (11) is installed in the positioning groove, and the shaft retaining ring (11) is pressed against the front end surface of the inner ring.

5. The snowmobile gearbox according to claim 4, characterized in that: The annular member is the above-mentioned shaft retaining ring (11).

6. The snowmobile gearbox according to claim 5, characterized in that: The input shaft (2) has an annular shaft shoulder surface (2a), and an annular installation groove for accommodating a limit sleeve (10) is formed between the shaft shoulder surface (2a) and the shaft retaining ring (11), and the axial length of the installation groove is greater than the axial length of the limit sleeve (10).

7. The snowmobile gearbox according to claim 3, characterized in that: The annular member is an annular limit seat integrally formed on the rear end of the input shaft (2).

8. The snowmobile gear box according to claim 2, characterized in that: The limiting member is a spring sleeved on the input shaft (2), an annular positioning seat is formed on the input shaft (2), and the front and rear ends of the spring can be pressed on the main gear (4) and the positioning seat respectively.

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